CN103019132A - Chip and method for realizing low-power-consumption mode - Google Patents
Chip and method for realizing low-power-consumption mode Download PDFInfo
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- CN103019132A CN103019132A CN2012104798168A CN201210479816A CN103019132A CN 103019132 A CN103019132 A CN 103019132A CN 2012104798168 A CN2012104798168 A CN 2012104798168A CN 201210479816 A CN201210479816 A CN 201210479816A CN 103019132 A CN103019132 A CN 103019132A
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Abstract
The invention provides a chip for realizing a low-power-consumption mode, comprising a standard reference source circuit capable of outputting appointed electrical level and bias, a power supply voltage low-voltage detection circuit, a low-power-consumption logic control circuit, and a digital logic unit, wherein the power supply voltage low-voltage detection circuit is used for comparing sampled chip current and voltage with the appointed electrical level and outputting a marking signal; the low-power-consumption logic control circuit is used for correspondingly outputting a control signal according to the change of high and low electrical levels of the marking signal; and the digital logic unit receives a control signal of the high electrical level and the chip enters the low-power-consumption mode; under the control of a clock signal, the standard reference source circuit and the power supply voltage low-voltage detection circuit can sample the change of the voltage of a power supply of the chip at regular time; and when the chip is at the low-power-consumption mode, the digital logic unit receives a control signal of the lower electrical level, and the chip quits the low-power-consumption mode. The invention further provides a method for realizing the low-power-consumption mode so as to solve the problem that the time of delaying data keeping time when power is suddenly off and reduce the problem of the possibility of instantly increasing the chip current, caused by spurious triggering.
Description
Technical field
The invention belongs to chip field, relate in particular to a kind of chip and method that realizes low-power consumption mode.
Background technology
Chip requires power supply could work in a definite voltage range usually.For battery VBAT application scenario, the supply voltage that usually requires chip at 1.8V between the 3.6V.When battery VBAT voltage is lower than 1.8V, although system's cisco unity malfunction, but the user often expects the significant data that is kept at internal RAM in the chip operational process and does not lose, and can also continue to use the data that originally are stored in the internal RAM after again changing battery.Although can lose the data that are stored in internal RAM during the complete power down of chip, as long as the supply voltage of chip is higher than 0.7V, RAM still can keep its inner data.In addition; when changing battery VBAT, chip power voltage can not have fully, for guarantee change battery VBAT during this period of time in chip power supply is still arranged; externally usually can a large capacitor C 1 in parallel between power vd D and the ground VSS to use as backup battery, as shown in Figure 1.
Be reduced to the time of 0.7V from 1.8V in order to prolong cell voltage, this requires chip to consume during the period the little electric current of trying one's best, present general battery applications chip internal structure synoptic diagram as shown in Figure 2, usually formed by following components: supply voltage low-voltage testing circuit 1, for detection of supply voltage, when the chip power voltage drop after specified level, chip namely sends reports to the police or carries out reset operation; Fiducial reference source circuit 2 is used to supply voltage low-voltage testing circuit 1 that accurately biasing is provided, so that the low voltage resetting circuit can work; Program storage 3 for the Nonvolatile memery unit of storage execute program, can be flash memories, also can be the single program memory cells; Random access memory 4, be used for storage chip at some important informations of operational process, random access memory 4 is volatile memory-elements, when the complete power down of chip, storage unit in the random access memory 4 can be lost, when the incomplete power down of chip, random access memory 4 can keep the content in the storer in the certain voltage scope, and this voltage is usually more than 0.7V; Digital logic unit 5, be used for control low voltage resetting circuit supply voltage low-voltage testing circuit 1 and fiducial reference source circuit 2 are carried out reset operation, digital logic unit 5 comprises the unit such as low voltage resetting circuit, central processor unit (CPU), timer, pulse producer.
In the prior art, the working current that often provides multiple-working mode to control chip as shown in Figure 2, such as standby mode, shutdown mode etc.Although these mode of operations can reduce chip from 1.8V be reduced to 0.7V during this period of time in working current; but in actual applications; the user does not often know when suddenly power down of power supply; may be in power down under the normal mode of operation; also may be under shutdown mode; therefore, the unexpected power down of power supply has certain uncertainty.When power supply power down under normal mode of operation, chip power consumption this moment electric current is often larger, has the power consumption electric current of hundred microampere orders or even milliampere level, so that the dump energy in the battery VBAT or the electric weight of capacitor C 1 interior storage are given out light rapidly.When power supply under shutdown mode during power down; the power consumption electric current can be very little; the electric weight of the dump energy in the battery VBAT or capacitor C 1 storage can be kept significant period of time; but because shutdown mode is easily waken up by external key usually; if accident is met these buttons in the time of practical operation; chip is very fast to be transferred to normal mode from shutdown mode, and moment can consume a large amount of electric currents, and the interior dump energy of battery VBAT or the electric weight of capacitor C 1 interior storage are given out light rapidly.Particularly in MCU (microprocessor) chip, it is particularly outstanding that the unexpected power down of power supply causes the RAM data probabilistic situation to occur.
Therefore, a kind of when method of power down of chip power voltage of judging need to be proposed, so that after making the power down of chip generation supply voltage, chip switches to low power mode of operation at once, reduce the working current of chip, thereby prolong the power down retention time of internal RAM data, solving in the prior art causes internal RAM to keep in some cases the short problem of data time because the power down time is uncertain, and how to effectively reduce the chip current moment increase that causes because of false triggering, thereby reduce the probability problem of RAM data hold time.
Summary of the invention
The object of the present invention is to provide a kind of chip and method that realizes low-power consumption mode, in order to can judge the when power down of chip power voltage, and then solve because of the uncertain problem that causes internal RAM may not keep data of power down time, and the chip current moment that has reduced effectively that false triggering causes the probability problem that increases.
For addressing the above problem, a kind of chip of realizing low-power consumption mode is provided, comprising:
Fiducial reference source circuit, described fiducial reference source circuit is exported a specified level and biasing;
The supply voltage low-voltage testing circuit that is connected with described fiducial reference source circuit, described supply voltage low-voltage testing circuit receives described specified level and biasing and sampling A/D chip supply voltage, and described chip power voltage compared with specified level, export a marking signal;
The low-power logic control circuit that is connected with fiducial reference source circuit with described supply voltage low-voltage testing circuit respectively, described low-power logic control circuit is exported a control signal according to described marking signal, and exports respectively the enable bit of a fiducial reference source circuit and the enable bit of supply voltage low-voltage testing circuit to described fiducial reference source circuit and supply voltage low-voltage testing circuit;
The digital logic unit that is connected with described low-power logic control circuit, when described digital logic unit judges that according to the described control signal that receives chip power voltage is lower than specified level, thereby the enable bit of output reference reference source circuit enables fiducial reference source circuit, thereby the enable bit of output supply voltage low-voltage testing circuit enables the supply voltage low-voltage testing circuit, chip enters low-power consumption mode, under the control of a clock signal, the variation of supply voltage low-voltage testing circuit timing sampling chip power voltage; Described digital logic unit judges that according to the described control signal that receives chip power voltage is higher than specified level, and chip withdraws from low-power consumption mode.
Further, when the described chip current voltage that samples was higher than specified level, the marking signal of described supply voltage low-voltage testing circuit output was high level; When the described chip current voltage that samples during less than specified level, the marking signal of described supply voltage low-voltage testing circuit output is low level.
Further, when described marking signal was low level by the high level saltus step, the control signal of described low-power logic control circuit output was high level; When described marking signal is low transition when being high level, the control signal of described low-power logic control circuit output is low level.
Further, when the control signal that receives when described digital logic unit was high level, chip entered low-power consumption mode; When chip under described low-power consumption mode, when the control signal that described digital logic unit receives was low level, chip withdrawed from described low-power consumption mode.
Further, described low-power logic control circuit comprises:
State machine circuit, the marking signal that described state machine circuit receives are high level when jumping to low level, export the described control signal of one first enable signal, a voltage sample state, one second enable signal and high level; When chip under described low-power consumption mode, the marking signal that described state machine circuit receives is low transition when being high level, exports the marking signal of one the 3rd enable signal, one the 4th enable signal and the output of described supply voltage low-voltage testing circuit of described DLC (digital logic circuit) and the low level control signal of described low-power logic control circuit output;
First selector when the control signal that described first selector receives is high level, selects to export described the first enable signal the enable bit that is fiducial reference source circuit; When the control signal that described first selector receives is low level, select to export described the 3rd enable signal the enable bit that is fiducial reference source circuit;
Second selector, when the control signal that described second selector receives is high level, select the output voltage sample states as reset signal to described digital logic unit; When the control signal that described second selector receives is low level, select the described marking signal of output as reset signal to described digital logic unit;
Third selector when the control signal that described third selector receives is high level, selects to export described the second enable signal the enable bit that is the supply voltage low-voltage testing circuit; When the control signal that described third selector receives is low level, select to export described the 4th enable signal the enable bit that is the supply voltage low-voltage testing circuit.
Further, in the chip of realization low-power consumption mode described above, also comprise the random access memory that is connected with described digital logic unit respectively, when the control signal that receives when described digital logic unit is high level, controls described random access memory by described digital logic unit and enter described low-power consumption mode; When the control signal that receives when described digital logic unit is low level, controls described random access memory by described digital logic unit and withdraw from described low-power consumption mode.
Further, described digital logic unit is controlled described random access memory duty by reset signal.
Further, in the chip of realization low-power consumption mode described above, also comprise the program storage that is connected with described digital logic unit respectively, when the control signal that receives when described digital logic unit is high level, controls described program storage by described digital logic unit and enter described low-power consumption mode; When the control signal that receives when described digital logic unit is low level, controls described program storage by described digital logic unit and withdraw from described low-power consumption mode.
Further, described digital logic unit is controlled described program storage duty by reset signal.
Further, in the chip of realization low-power consumption mode described above, also comprise the oscillator with low voltage and low power consumption that is connected with digital logic unit with described low-power logic control circuit, described oscillator with low voltage and low power consumption is exported described clock signal by described digital logic unit control work and by described low-power logic control circuit to fiducial reference source circuit and supply voltage low-voltage testing circuit.
Further, the external unit of described digital logic unit or described chip is exported described clock signal.
Further, in the chip of realization low-power consumption mode described above, described chip is the MCU chip.
According to another side of the present invention, the invention provides a kind of method that realizes low-power consumption mode, comprising:
When the enable bit of low-power logic control circuit does not enable, described low-power logic control circuit is exported a control signal, chip enters the low-power consumption mode illegal state, and fiducial reference source circuit and supply voltage low-voltage testing circuit receive respectively one the 3rd enable signal and one the 4th enable signal of digital logic unit output;
When described the 3rd enable signal and the 4th enable signal are effective, enable described low-power logic control circuit, so that chip enters the low-power consumption mode enabled state;
The same specified level of a chip power voltage that described supply voltage low-voltage testing circuit is sampled compares, and exports a marking signal;
Described low-power logic control circuit is exported described control signal according to the described marking signal that receives;
Described digital logic unit judges that according to the described control signal that receives working as described chip power voltage is lower than specified level, thereby thereby enabling the enable bit of fiducial reference source circuit and output supply voltage low-voltage testing circuit, the enable bit of described digital logic unit output reference reference source circuit enables the supply voltage low-voltage testing circuit, chip enters low-power consumption mode, described fiducial reference source circuit and supply voltage low-voltage testing circuit receive respectively one first enable signal and one first enable signal of described low-power logic control circuit output, under the control of a clock signal, the variation of described supply voltage low-voltage testing circuit timing sampling chip power voltage; Be higher than specified level when described supply voltage low-voltage testing circuit detects chip power voltage, chip withdraws from low-power consumption mode.
Further, when the described chip current voltage that samples was higher than specified level, the marking signal of described supply voltage low-voltage testing circuit output was high level; When the described chip current voltage that samples during less than specified level, the marking signal of described supply voltage low-voltage testing circuit output is low level.
Further, when described marking signal was low level by the high level saltus step, the control signal of described low-power logic control circuit output was high level; When described marking signal is low transition when being high level, the control signal of described low-power logic control circuit output is low level.
Further, when the control signal that described digital logic unit receives was high level, chip entered low-power consumption mode; When chip under described low-power consumption mode, when the control signal that described digital logic unit receives was low level, chip withdrawed from described low-power consumption mode.
Further, described low-power logic control circuit comprises works as state machine circuit, first selector, second selector and third selector,
The described marking signal that described state machine circuit receives is high level when jumping to low level, exports the control signal of a voltage sample state, described the first enable signal, the second enable signal and high level; When chip under described low-power consumption mode, the described marking signal that described state machine circuit receives is low transition when arriving high level, exports described the 3rd enable signal, the 4th enable signal and marking signal and low level control signal;
When the described control signal that described first selector receives was high level, the first enable signal that described first selector will receive was delivered to fiducial reference source circuit; When the described control signal that described first selector receives was low level, the 3rd enable signal that described first selector will receive was delivered to fiducial reference source circuit;
When the described control signal that described second selector receives was high level, described second selector was delivered to described digital logic unit with the voltage sample state that receives; When the described control signal that described second selector receives was low level, the described marking signal that described second selector will receive was delivered to described digital logic unit;
When the described control signal that described third selector receives was high level, the second enable signal that described third selector will receive was delivered to the supply voltage low-voltage testing circuit; When the described control signal that described third selector receives was low level, the 4th enable signal that described third selector will receive was delivered to the supply voltage low-voltage testing circuit.
Further, in the method for realization low-power consumption mode described above, comprise that also described digital logic unit was controlled a random access memory by described voltage sample state and entered described low-power consumption mode when control signal that described digital logic unit receives was high level; When the control signal that described digital logic unit receives was low level, described digital logic unit was controlled described random access memory by described marking signal and is withdrawed from described low-power consumption mode.
Further, in the method for realization low-power consumption mode described above, comprise that also described digital logic unit was controlled a program storage by described voltage sample state and entered described low-power consumption mode when control signal that described digital logic unit receives was high level; When the control signal that described digital logic unit receives was low level, described digital logic unit was controlled described program storage by described marking signal and is withdrawed from described low-power consumption mode.
Further, in the method for realization low-power consumption mode described above, comprise that also described digital logic unit controls an oscillator with low voltage and low power consumption job, and make described oscillator with low voltage and low power consumption export described clock signal by described low-power logic control circuit to described fiducial reference source circuit and supply voltage low-voltage testing circuit.
Further, the external unit of described digital logic unit or described chip is exported described clock signal.
Compared with prior art, the present invention is by increasing by a low-power logic control circuit between supply voltage low pressure sample circuit, fiducial reference source circuit and digital logic unit, realize the chip of a low-power consumption mode, when the chip of described low-power consumption mode enters a low-power consumption mode, under the control of a clock signal, described low-power logic control circuit enables the variation of supply voltage low pressure sample circuit and fiducial reference source circuit timing sampling chip power voltage, to reduce the action current of chip.Therefore, when chip is in normal mode of operation, during suddenly generating chip supply voltage power down, chip switches at once under the low-power consumption mode and works, prolong the data power down retention time of internal RAM, solved the problem that may not keep in some cases data in the prior art because of the uncertain RAM of causing of power down time.In addition, because described low-power consumption mode rises to just and can wake up at the chip power voltage of sampling, effectively reduce false triggering and caused the probability that chip current moment increases, strengthened the reliability of system.
In addition, when under chip enters low-power consumption mode, working, can be by the described digital logic unit of configuration, in order to control Digital Logic and the correlation module state of described digital logic unit, as control the duty of connected program storage and random access memory, described program storage and random access memory are resetted, with the issuable leakage current of further minimizing chip.
Description of drawings
Fig. 1 is the synoptic diagram that keeps chip internal RAM data external capacitor in the prior art;
Fig. 2 is the structural representation of battery applications chip internal in the prior art;
Fig. 3 is the structural representation of battery applications chip internal in the embodiment of the invention;
Fig. 4 is the structural representation of low-power logic control circuit inside in the embodiment of the invention;
Fig. 5 is the workflow synoptic diagram of realizing the low-power logic control circuit in the method for low-power consumption mode in the embodiment of the invention;
Fig. 6 is the signal waveform synoptic diagram of the low-power logic control circuit timing detection chip supply voltage among Fig. 5.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
A lot of details have been set forth in the following description so that fully understand the present invention.But the present invention can implement much to be different from alternate manner described here, and those skilled in the art can do similar popularization in the situation of intension of the present invention, so the present invention is not subjected to the restriction of following public implementation.
As shown in Figure 3, in conjunction with 4, be elaborated to the invention provides a kind of chip of low-power consumption mode of realizing.The chip of described realization low-power consumption mode comprises: fiducial reference source circuit 100, supply voltage low pressure sample circuit 102, low-power logic control circuit 104 and digital logic unit 106.
Concrete, described fiducial reference source circuit 100 is used for output one specified level and biasing.The output voltage of described fiducial reference source circuit 100 is very little with the variation of temperature and chip power voltage VDD.
Concrete, described supply voltage low-voltage testing circuit 102 is connected with described fiducial reference source circuit 100, described supply voltage low-voltage testing circuit 102 is used for receiving described specified level and biasing and sampling A/D chip current/voltage VDD, and according to when the described chip current voltage VDD that samples is higher than specified level, clear flag signal EXT_DET, output identification signal EXT_DET is high level again; As the described chip current voltage VDD that samples during less than specified level, clear flag signal EXT_DET, output identification signal EXT_DET is low level again.In chip commonly used, preferred, described supply voltage low pressure sample circuit 102 is low-voltage reset circuit or low-voltage sample circuit.Because the output voltage of described fiducial reference source circuit 100 is very little with the variation of temperature and chip power voltage VDD, described fiducial reference source circuit 100 provides accurately specified level and biasing to supply voltage low pressure sample circuit 102.
Concrete, described low-power logic control circuit 104 is connected with supply voltage low pressure sample circuit with described fiducial reference source circuit 100 and is connected, they be that described supply voltage low-voltage testing circuit 102 enable bit VBGEN and fiducial reference source circuit 100 enable bit DETEN are provided by low-power logic control circuit 104, and described supply voltage low-voltage testing circuit 102 is to low-power logic control circuit 104 output identification signals.It is high level that described low-power logic control circuit 104 is used for according to export a control signal MODE when described marking signal EXT_DET is low level by the high level saltus step; When described marking signal EXT_DET is that to export described control signal MODE when being high level be low level to low transition.
Concrete, described digital logic unit 106 is connected with the low-power logic control circuit, described digital logic unit 106 is used for according to when receiving described control signal MODE and be high level, make chip enter low-power consumption mode, under the control of a clock signal clk, and by controlling the variation of described low-power logic control circuit 104 control fiducial reference source circuits 100 and supply voltage low pressure sample circuit 102 timing sampling chip power voltage VDD; When chip under described low-power consumption mode, be used for making chip withdraw from described low-power consumption mode according to when receiving described control signal MODE and be low level.The Digital Logic core that described digital logic unit 106 is chips, mainly comprise CPU (central processing unit) (CPU) module and other modules etc., described other modules comprise such as modules such as timer, pulse producer, serial communication logic, input/output port control and clock generating.
Concrete, referring to Fig. 4, described low-power logic control circuit 102 comprises state machine circuit 202, first selector 204, second selector 206 and third selector 208, its concrete analysis is as follows:
Described state machine circuit 202, be used for exporting one first enable signal INT_VBGEN, one second enable signal INT_DETEN, a voltage sample state I NT_DET and described control signal MODE being set to high level (being that low-power consumption mode enables) and to export according to as the described marking signal EXT_DET that receives being high level when jumping to low level; When chip under described low-power consumption mode, be used for according to as the described marking signal EXT_DET that receives being low transition when being high level, with one the 3rd enable signal EXT_VBGEN, one the 4th enable signal EXT_DETEN output of described DLC (digital logic circuit) 106 and with the marking signal EXT_DET output of described supply voltage low-voltage testing circuit 103 with the control signal MODE of described low-power logic control circuit output is set to low level (being that low-power consumption mode does not enable) exports.
Described first selector 204 is used for according to when the described control signal MODE that receives is high level, selects to export described the first enable signal INT_VBGEN the enable bit that is fiducial reference source circuit to fiducial reference source circuit 100; When the described control signal MODE that receives is low level, select to export described the 3rd enable signal EXT_VBGEN the enable bit that is fiducial reference source circuit to fiducial reference source circuit.In the present embodiment, for fitting into respectively the work that enables under the low-power consumption mode and not entering the work that enables under the low-power consumption mode, the enable bit VBGEN of described fiducial reference source circuit 100 enables according to described the first enable signal INT_VBGEN or the 3rd enable signal EXT_VBGEN that receive respectively.
Described second selector 206 is used for according to when the described control signal MODE that receives is high level, selects output voltage sample states INT_DET as reset signal VDET described digital logic unit 106 extremely; When the described control signal MODE that receives is low level, select the described marking signal EXT_DET of output as reset signal VDET to described digital logic unit 106.In the present embodiment, for fitting into respectively the work that enables under the low-power consumption mode and do not enter the work that enables under the low-power consumption mode, described digital logic unit is respectively according to the described voltage sample state I NT_DET that receives or marking signal EXT_DET reset its each included digital logic module and correlation module state.
Described third selector 208 is used for according to when the described control signal MODE that receives is high level, selects to export described the second enable signal INT_DETEN the enable bit that is the supply voltage low-voltage testing circuit to supply voltage low-voltage testing circuit 102; When the described control signal MODE that receives is low level, select to export described the 4th enable signal EXT_DETEN the enable bit that is the supply voltage low-voltage testing circuit to the supply voltage low-voltage testing circuit.In the present embodiment, for fitting into respectively the work that enables under the low-power consumption mode and not entering the work that enables under the low-power consumption mode, the enable bit DETEN of described supply voltage low-voltage testing circuit 102 enables according to described the second enable signal INT_DETEN or the 4th enable signal EXT_DETEN that receive respectively.
In addition, in the chip of described low-power consumption mode, also comprise the program storage 108 that is connected with described digital logic unit 106.Wherein, described program storage 108 is used for the program code of storage chip operation, and can be electricallyerasable ROM (EEROM) (EEPROM), single programmable memory (OTP) or flash memory (FLASH).When the described control signal MODE of described digital logic unit 106 receptions is high level, enter described low-power consumption mode by the described program storage 108 of described digital logic unit 106 controls; When described digital logic unit 106 receives described control signal MODE and is low level, withdraw from described low-power consumption mode by the described program storage 108 of described digital logic unit 106 controls.And described digital logic unit 106 can be controlled described program storage 108 duties by reset signal VDET.
In addition, in the chip of described low-power consumption mode, can also comprise the random access memory 110 that is connected with described digital logic unit 106.The significant data result who produces when wherein, described random access memory 110 is used for the storage chip operation or the duty of chip.When the described control signal MODE of described digital logic unit 106 receptions is high level, enter described low-power consumption mode by the described random access memory 110 of described digital logic unit 106 controls; When described digital logic unit 106 receives described control signal MODE and is low level, withdraw from described low-power consumption mode by the described random access memory 110 of described digital logic unit 106 controls.And described digital logic unit 106 can be controlled described random access memory 110 duties by reset signal VDET.
In addition, in the chip of described low-power consumption mode, also comprise the program storage 108 and the random access memory 110 that are connected with described digital logic unit 106 respectively.Wherein, described program storage 108 is used for the program code of storage chip operation, and can be electricallyerasable ROM (EEROM) (EEPROM), single programmable memory (OTP) or flash memory (FLASH); The significant data result that described random access memory 110 produces when being used for the storage chip operation or the duty of chip.When the described control signal MODE of described digital logic unit 106 receptions is high level, enter described low-power consumption mode by the described digital logic unit 106 described program storages 108 of control and random access memory 110; When described digital logic unit 106 receives described control signal MODE and is low level, withdraw from described low-power consumption mode by the described digital logic unit 106 described program storages 108 of control and random access memory 110.And described digital logic unit 106 can be controlled described program storage 108 and random access memory 110 duties by reset signal VDET.
Further, chip enters low-power consumption mode, described clock signal is provided to described low-power logic control circuit 104 to described low-power logic control circuit 104 outputs or by described chip exterior by described digital logic unit, export described clock signal clk by described low-power logic control circuit 104 to described supply voltage low-voltage testing circuit 102, described supply voltage low-voltage testing circuit 102 under the control of described clock signal clk, the variation of timing sampling chip power voltage.Perhaps, described clock signal clk also can be provided by an oscillator with low voltage and low power consumption 112.Described oscillator with low voltage and low power consumption 112 is connected with digital logic unit with described low-power logic control circuit 104 respectively and is connected, when described digital logic unit 106 receives described control signal MODE and is high level, provide Clock enable enable signal CLKEN to enable to oscillator with low voltage and low power consumption 112.Described oscillator with low voltage and low power consumption 112 is the integrated CMOS oscillatory circuits of chip internal, after enabling described oscillator with low voltage and low power consumption 112, be used for providing clock signal clk to described low-power logic control circuit 104, and in conjunction with described the first enable signal INT_VBGEN and the second enable signal INT_DETEN can the described fiducial reference source circuit 100 of time opening and supply voltage low-voltage testing circuit 102 timing logics.In the present embodiment, by described state machine circuit 202 receive clock signal CLK; Described oscillator with low voltage and low power consumption 112 also can be in the chip exterior of described low-power consumption mode, and the oscillation frequency of described oscillator with low voltage and low power consumption 112 is about 20KHZ (KHz), and static current of lcd is less than 1 microampere.After the chip of low-power consumption mode entered low-power consumption mode, described oscillator with low voltage and low power consumption 112 can be worked always, until withdraw from till the low-power consumption mode.
In the present embodiment, the chip of described realization low-power consumption mode is the MCU chip.
Described low-power logic control circuit 104 is used for entering low-power consumption mode and withdrawing from low-power consumption mode according to the chip of the high-low level variation control low-power consumption mode of described marking signal EXT_DET, described low-power logic control circuit 104 has inner enable bit or disable bit, those of ordinary skill in the art should be understood that described enable bit or disable bit can realize by the application configuration internal register.And Digital Logic and correlation module state that described digital logic unit 106 is controlled described digital logic unit 106 according to the described control signal MODE that receives or reset signal VDET, as the duty of program storage 108 and random access memory 110 as described in controlling; As forbid the clock generating module so that all no longer actions of digital logic unit 106 as described in whole, to reduce the dynamic current of chip; As to dispose the input/output port control module be that input channel and output channel are closed to reduce because of the floating empty leakage problem that may cause of input signal etc. fully, that is: in the present embodiment, after the chip of low-power consumption mode enters low-power consumption mode, except described low-power logic control circuit 104 is worked always, and outside described fiducial reference source circuit 100 and supply voltage low-voltage testing circuit 102 time openings, the input/output port control module that disposes described digital logic unit 106 be input and output not enabled state to reduce the issuable leakage current of chip.
Referring to Fig. 3, in conjunction with Fig. 5 and Fig. 6, a kind of method of low-power consumption mode that realizes provided by the invention is carried out labor.The method of described realization low-power consumption mode comprises:
As shown in Figure 3, provide the chip of a realization low-power consumption mode, easy in order to describe, with the chip abbreviation chip of described realization low-power consumption mode.See also Fig. 5, when the inside of low-power logic control circuit 104 enable bit does not enable, one control signal MODE of described low-power logic control circuit 104 outputs is set to low level, and described chip is in low-power consumption mode illegal state 301, and described chip can not enter low-power consumption mode.After the described control signal MODE that digital logic unit 106 receives was low level, described digital logic unit 106 was exported one the 3rd enable signal EXT_VBGEN and is exported one the 4th enable signal EXT_DETEN to the enable bit VBGEN of fiducial reference source circuit 100 to the enable bit DETEN of supply voltage low-voltage testing circuit 102.
When described digital logic unit 106 described the 3rd enable signal EXT_VBGEN of configuration and the 4th enable signal EXT_DETEN are output as high level, when enabling simultaneously described low-power logic control circuit 102, under above-mentioned state, described supply voltage low-voltage testing circuit 102 is sampling A/D chip supply voltage VDD always, and described chip enters low-power consumption mode enabled state 302.When described supply voltage low-voltage testing circuit 102 samples chip power voltage VDD and is lower than specified level, described control signal MODE is set to high level, when described supply voltage low-voltage testing circuit 102 did not sample chip power voltage VDD and is lower than specified level, described control signal MODE remained low level always.When the described control signal MODE of low-power logic control circuit 102 outputs is high level as described, described chip will enter low-power consumption mode, under described low-power consumption mode, described fiducial reference source circuit 100 provides specified level and biasing to supply voltage low-voltage testing circuit 102, and the variation of described supply voltage low-voltage testing circuit 102 timing sampling chip power voltage VDD.
Described low-power consumption mode enabled state 302 times, described the 3rd enable signal EXT_VBGEN and the 4th enable signal EXT_DETEN enable respectively described fiducial reference source circuit 100 and the always variation of chip monitoring supply voltage VDD of supply voltage low-voltage testing circuit 102.According to the chip power voltage VDD of described supply voltage low-voltage testing circuit 102 samplings and the result that compares of described given voltage, the marking signal EXT_DET that judges described supply voltage low-voltage testing circuit 102 outputs is high level or low level, if that is: the described chip power voltage VDD that samples of described supply voltage low-voltage testing circuit 102 drops to when being lower than specified level from being higher than specified level, described supply voltage low-voltage testing circuit 102 output identification signals are low level; If the described chip power voltage VDD that described supply voltage low-voltage testing circuit 102 samples rises to when being higher than specified level from being lower than specified level, described supply voltage low-voltage testing circuit 102 output identification signals are high level.
And, variation 303 according to the high-low level of described marking signal EXT_DET judges whether the chip of described realization low-power consumption mode enters described low-power consumption mode, if that is: the marking signal EXT_DET of described supply voltage low-voltage testing circuit 102 outputs keeps high level always, described chip rests on described low-power consumption mode enabled state 302 times all the time; When described low-power logic control circuit 104 detects described marking signal EXT_DET and jumps to low level (being EXT_DET=1 ' b0) by high level, described digital logic unit 106 is high level according to the control signal MODE of described low-power logic control circuit 104 outputs, makes described chip enter described low-power consumption mode 304; In described low-power consumption mode 304, when described low-power logic control circuit 104 detects described marking signal MODE for by low transition during to high level (being EXT_DET=1 ' b1), described digital logic unit 106 is low level according to the control signal MODE of described low-power logic control circuit 104 outputs, makes described chip withdraw from described low-power consumption mode.
Concrete, under the control of a clock signal clk, state machine circuit 202 in the described low-power logic control circuit 102 changes 303 according to the high-low level of described marking signal EXT_DET, controls the enable bit DETEN of the enable bit VBGEN of described fiducial reference source circuit 100 and supply voltage low-voltage testing circuit 102 to realize timing sampling chip power voltage VDD; High-low level according to described marking signal EXT_DET changes 303, the corresponding control signal MODE of described low power consumption control logical one 04 output, according to the height of described control signal MODE, the first selector 204 in the described low power consumption control logical one 02 is selected the first enable signal INT_VBGEN (namely entering the enable bit VBGEN of low-power consumption mode fiducial reference source circuit 100 afterwards) or the 3rd enable signal EXT_VBGEN (namely entering low-power consumption mode fiducial reference source circuit 100 enable bit VBGEN before); Second selector 206 in the described low power consumption control logical one 02 selects voltage sample state I NT_DET (namely entering low-power consumption mode reset signal afterwards) or marking signal EXT_DET (namely to enter low-power consumption mode reset signal before as reset signal VDET; Third selector 208 in the described low power consumption control logical one 02 is selected the second enable signal INT_DETEN (namely entering the enable bit DETEN of low-power consumption mode supply voltage low-voltage testing circuit 102 afterwards) or the 4th enable signal EXT_DETEN (namely entering the enable bit DETEN of low-power consumption mode supply voltage low-voltage testing circuit 102 before).
In this example, that is to say, when described state machine circuit 202 detects described marking signal EXT_DET and jumps to low level (being EXT_DET=1 ' b0) by high level, the control signal of described state machine circuit 202 output high level, then enter low-power consumption mode, at this moment, described first selector, second selector and third selector are under the control of high level at described control signal MODE, the the first enable signal INT_VBGEN that respectively described state machine circuit 202 is produced, voltage sample state I NT_DET, and the second enable signal INT_DETEN selects output.After enabling to enter low-power consumption mode, when if described state machine circuit 202 detects described marking signal EXT_DET from low transition to high level, the control signal of described state machine circuit 202 output low levels, then enable to withdraw from low-power consumption mode, described first selector then, second selector and third selector are under the low level control at described control signal MODE, respectively by the three enable signal EXT_VBGEN of described state machine circuit 202 with described digital logic unit 106 outputs, marking signal EXT_DET, and the 4th enable signal EXT_DETEN selects output.
In the present embodiment, described digital logic unit 106 program code read from a program storage 114 carries out the program operation, the method of described realization low-power consumption mode also comprises: when the described control signal MODE that receives when described digital logic unit 106 was high level, described digital logic unit 106 was controlled described program storage 108 by described voltage sample state I NT_DET and is entered described low-power consumption mode; When the described control signal MODE that receives of described digital logic unit 106 when being low level, described digital logic unit 106 is controlled described program storage 108 by described marking signal EXT_DET and is withdrawed from described low-power consumption mode.
In the present embodiment, described digital logic unit 106 can also operate to preserve significant data in the course of work to a random access memory 116, the method of described realization low-power consumption mode can also comprise: when the described control signal MODE that receives when described digital logic unit 106 was high level, described digital logic unit 106 was controlled described random access memory 110 by described voltage sample state I NT_DET and is entered described low-power consumption mode; When the described control signal MODE that receives of described digital logic unit 106 when being low level, described digital logic unit 106 is controlled described random access memory 110 by described marking signal EXT_DET and is withdrawed from described low-power consumption mode.
In the present embodiment, also comprise in the method for described realization low-power consumption mode: export described clock signal clk by described digital logic unit 106 to described low-power logic control circuit, or provide described clock signal clk by described chip exterior to described low-power logic control circuit.Perhaps, in the method for described realization low-power consumption mode, can by described digital logic unit 106 enable an oscillator with low voltage and low power consumption 112 so that described oscillator with low voltage and low power consumption 112 to low-power logic control circuit clock signal CLK.Specifically, see also Fig. 6, described oscillator with low voltage and low power consumption 112 inside arrange, can make described oscillator with low voltage and low power consumption described marking signal EXT_DET of once sampling in 128 clock period, within the sampling time, as when the 124th clock period, enable fiducial reference source circuit (the enable bit VBGEN that is fiducial reference source circuit 100 is high level); When the 126th clock period, enable supply voltage low-voltage testing circuit (the enable bit DETEN that is supply voltage low-voltage testing circuit 102 is high level); At this moment, described chip has entered low-power consumption mode enabled state 302, the result of described marking signal EXT_DET sampled when the 127th clock period, if the marking signal EXT_DET of supply voltage low-voltage testing circuit 102 outputs is high level, expression chip power voltage VDD is higher than specified level, then described chip withdraws from low power mode of operation and reenters low-power consumption mode enabled state 302, if the marking signal EXT_DET of supply voltage low-voltage testing circuit output is low level, expression chip power voltage VDD still is lower than specified level, and then described chip still remains on low-power consumption mode 304 times; The 128th clock period removed the enable bit VBGEN of fiducial reference source circuit 100 and the enable bit DETEN (only having 4 clock period to enable supply voltage low-voltage testing circuit and fiducial reference source circuit) of supply voltage low-voltage testing circuit 102.And when described chip is in low-power consumption mode illegal state 301, described supply voltage low-voltage testing circuit 102 real-time sampling chip power voltage VDD.
Described low-power consumption mode 304 times, described chip enters under the low-power consumption mode and works, by described control signal MODE to each Digital Logic in the described DLC (digital logic circuit) 106 and correlation module state, as the duty of program storage 108 and random access memory 110 as described in controlling; As forbid the clock generating module so that as described in whole digital logic unit 106 all no longer the action, to reduce the dynamic current of described chip; As to dispose the input/output port control module be that input channel and output channel are closed to reduce because of the floating empty leakage problem that may cause of input signal etc. fully, regularly enables described fiducial reference source circuit 100 and supply voltage low-voltage testing circuit 102 to reduce the average power consumption of system by described oscillator with low voltage and low power consumption 112 that is:.This be because total quiescent current of the described fiducial reference source circuit 100 under the described low-power consumption mode illegal state 301 and supply voltage low-voltage testing circuit 102 as example, current sinking was 16 microamperes when fiducial reference source circuit 100 was worked as described, current sinking is 32 microamperes during described supply voltage low-voltage testing circuit 102 work, described total quiescent current is 48 microamperes when then working, and chip of the present invention is within 128 clock period, described fiducial reference source circuit 100 only has 4 clock period to enable, described supply voltage low-voltage testing circuit 102 only has 2 clock period to enable, its long average current is 1 microampere (32/128*2+16/128*4), greatly reduces system power dissipation.
Compared with prior art, the present invention is by increasing by a low-power logic control circuit between supply voltage low pressure sample circuit, fiducial reference source circuit and digital logic unit, realize the chip of a low-power consumption mode, when the chip of described low-power consumption mode enters a low-power consumption mode, under the control of a clock signal clk, described low-power logic control circuit enables the variation of supply voltage low pressure sample circuit and fiducial reference source circuit timing sampling chip power voltage, to reduce the action current of chip.Therefore, when chip is in normal mode of operation, during suddenly generating chip supply voltage power down, chip switches at once under the low-power consumption mode and works, prolong the data power down retention time of internal RAM, solved the problem that may not keep in some cases data in the prior art because of the uncertain RAM of causing of power down time.In addition, because described low-power consumption mode rises to just and can wake up at the chip power voltage of sampling, effectively reduce false triggering and caused the probability that chip current moment increases, strengthened the reliability of system.
In addition, when under chip enters low-power consumption mode, working, can be by the described digital logic unit of configuration, in order to control Digital Logic and the correlation module state of described digital logic unit, as control the duty of connected program storage and random access memory, described program storage and random access memory are resetted, with the issuable leakage current of further minimizing chip.
Although the present invention with preferred embodiment openly as above; but it is not to limit claim; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.
Claims (21)
1. chip of realizing low-power consumption mode comprises:
Fiducial reference source circuit, described fiducial reference source circuit is exported a specified level and biasing;
The supply voltage low-voltage testing circuit that is connected with described fiducial reference source circuit, described supply voltage low-voltage testing circuit receives described specified level and biasing and sampling A/D chip supply voltage, and described chip power voltage compared with specified level, export a marking signal;
The low-power logic control circuit that is connected with fiducial reference source circuit with described supply voltage low-voltage testing circuit respectively, described low-power logic control circuit is exported a control signal according to described marking signal, and exports respectively the enable bit of a fiducial reference source circuit and the enable bit of supply voltage low-voltage testing circuit to described fiducial reference source circuit and supply voltage low-voltage testing circuit;
The digital logic unit that is connected with described low-power logic control circuit, when described digital logic unit judges that according to the described control signal that receives chip power voltage is lower than specified level, thereby the enable bit of output reference reference source circuit enables fiducial reference source circuit, thereby the enable bit of output supply voltage low-voltage testing circuit enables the supply voltage low-voltage testing circuit, chip enters low-power consumption mode, under the control of a clock signal, the variation of supply voltage low-voltage testing circuit timing sampling chip power voltage; Described digital logic unit judges that according to the described control signal that receives chip power voltage is higher than specified level, and chip withdraws from low-power consumption mode.
2. the chip of realization low-power consumption mode as claimed in claim 1 is characterized in that, when the described chip current voltage that samples was higher than specified level, the marking signal of described supply voltage low-voltage testing circuit output was high level; When the described chip current voltage that samples during less than specified level, the marking signal of described supply voltage low-voltage testing circuit output is low level.
3. the chip of realization low-power consumption mode as claimed in claim 2 is characterized in that, when described marking signal was low level by the high level saltus step, the control signal of described low-power logic control circuit output was high level; When described marking signal is low transition when being high level, the control signal of described low-power logic control circuit output is low level.
4. the chip of realization low-power consumption mode as claimed in claim 3 is characterized in that, when the control signal that receives when described digital logic unit was high level, chip entered low-power consumption mode; When chip under described low-power consumption mode, when the control signal that described digital logic unit receives was low level, chip withdrawed from described low-power consumption mode.
5. the chip of realization low-power consumption mode as claimed in claim 3 is characterized in that, described low-power logic control circuit comprises:
State machine circuit, the marking signal that described state machine circuit receives are high level when jumping to low level, export the described control signal of one first enable signal, a voltage sample state, one second enable signal and high level; When chip under described low-power consumption mode, the marking signal that described state machine circuit receives is low transition when being high level, exports the marking signal of one the 3rd enable signal, one the 4th enable signal and the output of described supply voltage low-voltage testing circuit of described DLC (digital logic circuit) and the low level control signal of described low-power logic control circuit output;
First selector when the control signal that described first selector receives is high level, selects to export described the first enable signal the enable bit that is fiducial reference source circuit; When the control signal that described first selector receives is low level, select to export described the 3rd enable signal the enable bit that is fiducial reference source circuit;
Second selector, when the control signal that described second selector receives is high level, select the output voltage sample states as reset signal to described digital logic unit; When the control signal that described second selector receives is low level, select the described marking signal of output as reset signal to described digital logic unit;
Third selector when the control signal that described third selector receives is high level, selects to export described the second enable signal the enable bit that is the supply voltage low-voltage testing circuit; When the control signal that described third selector receives is low level, select to export described the 4th enable signal the enable bit that is the supply voltage low-voltage testing circuit.
6. the chip of realization low-power consumption mode as claimed in claim 3, it is characterized in that, also comprise the random access memory that is connected with described digital logic unit respectively, when the control signal that receives when described digital logic unit is high level, controls described random access memory by described digital logic unit and enter described low-power consumption mode; When the control signal that receives when described digital logic unit is low level, controls described random access memory by described digital logic unit and withdraw from described low-power consumption mode.
7. the chip of realization low-power consumption mode as claimed in claim 6 is characterized in that, described digital logic unit is controlled described random access memory duty by reset signal.
8. the chip of realization low-power consumption mode as claimed in claim 3, it is characterized in that, also comprise the program storage that is connected with described digital logic unit respectively, when the control signal that receives when described digital logic unit is high level, controls described program storage by described digital logic unit and enter described low-power consumption mode; When the control signal that receives when described digital logic unit is low level, controls described program storage by described digital logic unit and withdraw from described low-power consumption mode.
9. the chip of realization low-power consumption mode as claimed in claim 8 is characterized in that, described digital logic unit is controlled described program storage duty by reset signal.
10. the chip of realization low-power consumption mode as claimed in claim 1, it is characterized in that, also comprise the oscillator with low voltage and low power consumption that is connected with digital logic unit with described low-power logic control circuit, described oscillator with low voltage and low power consumption is exported described clock signal by described digital logic unit control work and by described low-power logic control circuit to fiducial reference source circuit and supply voltage low-voltage testing circuit.
11. the chip of realization low-power consumption mode as claimed in claim 1 is characterized in that, the external unit of described digital logic unit or described chip is exported described clock signal.
12. the chip such as the described realization low-power consumption mode of any one in the claim 1 to 11 is characterized in that, described chip is the MCU chip.
13. a method that realizes low-power consumption mode comprises:
When the enable bit of low-power logic control circuit does not enable, described low-power logic control circuit is exported a control signal, chip enters the low-power consumption mode illegal state, and fiducial reference source circuit and supply voltage low-voltage testing circuit receive respectively one the 3rd enable signal and one the 4th enable signal of digital logic unit output;
When described the 3rd enable signal and the 4th enable signal are effective, enable described low-power logic control circuit, so that chip enters the low-power consumption mode enabled state;
The same specified level of a chip power voltage that described supply voltage low-voltage testing circuit is sampled compares, and exports a marking signal;
Described low-power logic control circuit is exported described control signal according to the described marking signal that receives;
Described digital logic unit judges that according to the described control signal that receives working as described chip power voltage is lower than specified level, thereby thereby enabling the enable bit of fiducial reference source circuit and output supply voltage low-voltage testing circuit, the enable bit of described digital logic unit output reference reference source circuit enables the supply voltage low-voltage testing circuit, chip enters low-power consumption mode, described fiducial reference source circuit and supply voltage low-voltage testing circuit receive respectively one first enable signal and one first enable signal of described low-power logic control circuit output, under the control of a clock signal, the variation of described supply voltage low-voltage testing circuit timing sampling chip power voltage; Be higher than specified level when described supply voltage low-voltage testing circuit detects chip power voltage, chip withdraws from low-power consumption mode.
14. the method for realization low-power consumption mode as claimed in claim 13 is characterized in that, when the described chip current voltage that samples was higher than specified level, the marking signal of described supply voltage low-voltage testing circuit output was high level; When the described chip current voltage that samples during less than specified level, the marking signal of described supply voltage low-voltage testing circuit output is low level.
15. the method for realization low-power consumption mode as claimed in claim 14 is characterized in that, when described marking signal was low level by the high level saltus step, the control signal of described low-power logic control circuit output was high level; When described marking signal is low transition when being high level, the control signal of described low-power logic control circuit output is low level.
16. the chip of realization low-power consumption mode as claimed in claim 15 is characterized in that, when the control signal that described digital logic unit receives was high level, chip entered low-power consumption mode; When chip under described low-power consumption mode, described digital logic unit receives when stating control signal and being low level, chip withdraws from described low-power consumption mode.
17. the method for realization low-power consumption mode as claimed in claim 15 is characterized in that, described low-power logic control circuit comprises works as state machine circuit, first selector, second selector and third selector,
The described marking signal that described state machine circuit receives is high level when jumping to low level, exports the control signal of a voltage sample state, described the first enable signal, the second enable signal and high level; When chip under described low-power consumption mode, the described marking signal that described state machine circuit receives is low transition when arriving high level, exports described the 3rd enable signal, the 4th enable signal and marking signal and low level control signal;
When the described control signal that described first selector receives was high level, the first enable signal that described first selector will receive was delivered to fiducial reference source circuit; When the described control signal that described first selector receives was low level, the 3rd enable signal that described first selector will receive was delivered to fiducial reference source circuit;
When the described control signal that described second selector receives was high level, described second selector was delivered to described digital logic unit with the voltage sample state that receives; When the described control signal that described second selector receives was low level, the described marking signal that described second selector will receive was delivered to described digital logic unit;
When the described control signal that described third selector receives was high level, the second enable signal that described third selector will receive was delivered to the supply voltage low-voltage testing circuit; When the described control signal that described third selector receives was low level, the 4th enable signal that described third selector will receive was delivered to the supply voltage low-voltage testing circuit.
18. the method for realization low-power consumption mode as claimed in claim 15, it is characterized in that, comprise that also described digital logic unit was controlled a random access memory by described voltage sample state and entered described low-power consumption mode when control signal that described digital logic unit receives was high level; When the control signal that described digital logic unit receives was low level, described digital logic unit was controlled described random access memory by described marking signal and is withdrawed from described low-power consumption mode.
19. the method for realization low-power consumption mode as claimed in claim 15, it is characterized in that, comprise that also described digital logic unit was controlled a program storage by described voltage sample state and entered described low-power consumption mode when control signal that described digital logic unit receives was high level; When the control signal that described digital logic unit receives was low level, described digital logic unit was controlled described program storage by described marking signal and is withdrawed from described low-power consumption mode.
20. the method for realization low-power consumption mode as claimed in claim 13, it is characterized in that, also comprise by described digital logic unit and control an oscillator with low voltage and low power consumption job, and make described oscillator with low voltage and low power consumption export described clock signal by described low-power logic control circuit to described fiducial reference source circuit and supply voltage low-voltage testing circuit.
21. the method for realization low-power consumption mode as claimed in claim 13 is characterized in that, the external unit of described digital logic unit or described chip is exported described clock signal.
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