CN102478787B - Function control circuit and multimedia equipment - Google Patents

Function control circuit and multimedia equipment Download PDF

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CN102478787B
CN102478787B CN 201010557431 CN201010557431A CN102478787B CN 102478787 B CN102478787 B CN 102478787B CN 201010557431 CN201010557431 CN 201010557431 CN 201010557431 A CN201010557431 A CN 201010557431A CN 102478787 B CN102478787 B CN 102478787B
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circuit
control circuit
voltage
function
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CN102478787A (en
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肖丽荣
江力
李深远
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JUCAI MICRO DEVICES (SHENZHEN) CO Ltd
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Abstract

The invention provides a function control circuit and multimedia equipment, which are applicable to the field of circuits. The function control circuit comprises a power input unit, a module power circuit, a resident power circuit, a multifunctional multiplex pin FUN_PIN, a function key Key1, a function key Key2, a status signal generator and a pin power circuit, and the pin power circuit is respectively connected with an output end of the resident power circuit and an input end of the multifunctional multiplex pin FUN_PIN, and is used for providing pin voltage to the multifunctional multiplex pin FUN_PIN. The pin power circuit is added in an existing function control circuit, a traditional pin voltage changing method is improved, needed upwards pulling/downwards pulling resistors in the prior art are omitted, simplicity of a total PCB (printed circuit board) is improved, so that a system-on-chip SOC still can respond to operation of the function keys in a standby status, and configuration of the function keys is optimized.

Description

A kind of function control circuit and multimedia equipment
Technical field
The invention belongs to circuit field, relate in particular to a kind of function control circuit and multimedia equipment.
Background technology
Use now SOC (system on a chip) SOC (System On a Chip in the multimedia equipment more, SOC (system on a chip)) technique, ADC (Analog-to-Digital Converter, analog-digital chip) is a kind of conventional scheme that SOC (system on a chip) SOC utilizes the control of pin practical function.The ADC chip is exported thereby obtain different data by level and reference voltage on the multiplexing functions pin of SOC (system on a chip) SOC are compared.And SOC (system on a chip) SOC produces different responses according to above-mentioned different data output, thereby realizes different functions.
Existing function control circuit principle as shown in Figure 1.Draw voltage VCCIO on producing one by module power supply circuit 12, produce a reference voltage by reference voltage circuit 13.ADC IN is as the multiplexing functions pin of SOC (system on a chip) SOC, ADC chip 11 is by comparing level and reference voltage on the ADC IN pin, thereby obtain different State-outputs, and SOC (system on a chip) SOC finishes different responses according to above-mentioned different State-output, realize different functions.
Particularly, when function key Key1, function key Key2 and function key Key3 were not pressed, the voltage of pin ADC_IN was moved to voltage VCCIO on the resistance R 4, and representative state 0, SOC (system on a chip) SOC do not send any response; When pressing the difference in functionality key, the voltage of pin ADC_IN because in the function key branch road resistance drop-down/on draw and change thereupon, different voltage and reference voltages are made comparisons, thereby make the ADC chip export different representative states, finish the difference response of SOC (system on a chip) SOC, realize different functions.
The shortcoming of this circuit is, reference voltage is had relatively high expectations, if reference voltage deviation slightly will cause the deviation of data output of ADC chip very large, even may cause SOC (system on a chip) SOC to produce wrong response.In addition, SOC (system on a chip) SOC outside need carry out drop-down with resistance to pin or on draw effect, be unfavorable for the simplification of overall PCB.Moreover when SOC (system on a chip) SOC was in holding state, function key lost efficacy, and the realization of functions of functional keys is subject to the restriction of applied environment.
Fig. 2 shows the structure of existing another kind of function control circuit:
In Fig. 2, power input unit 21 wherein will be exported resident voltage as long as power input unit 21, is resided power circuit 23 to resident power circuit 23 input voltages to module power supply circuit 22 and resident power circuit 23 input voltages.And module power supply circuit 22 is by the control of the Enable signal (enable signal) of resident power circuit 23 outputs, in SOC (system on a chip) SOC chip and each functional module of SOC (system on a chip) SOC chip exterior (as: GPIO module, memory module etc.) output voltage V CCIO or stop the output of voltage VCCIO.
When Enable signal controlling module power supply circuit 22 anergy, the resident voltage of resident power circuit 23 outputs is only arranged, this state is holding state.
When Enable signal controlling module power supply circuit 22 enabled, module power supply circuit 22 and resident power circuit 23 had Voltage-output, and the state of this moment is duty.
At holding state, when function key Key1 and function key Key2 are not pressed, perhaps only have function key Key2 to be pressed, because the drop-down effect of resistance R 2, pin FUN_IN level is 0, status signal output " state 0 ", and SOC (system on a chip) SOC does not send any response; Key1 is pressed when function key, perhaps function key Key1 and function key Key2 are pressed simultaneously, pin FUN_IN level is VO1, representative state 1, status signal output " state 1 ", SOC (system on a chip) SOC receives and sends after " state 1 " correspondingly 1, realizes power up function, and resident power circuit 23 produces voltage VCCIO by Enable signal controlling module power supply circuit 22.
In working order, if function key Key1 and function key Key2 are not pressed, because the drop-down effect of resistance R 2, pin FUN_IN level is 0V, representative state 0, and status signal output " state 0 ", SOC (system on a chip) SOC does not send any response; If function key Key1 is pressed, pin FUN_IN level is VO1, representative state 1, status signal output " state 1 ", SOC (system on a chip) SOC sends response 1 after receiving " state 1 ", SOC (system on a chip) SOC can realize playing function or make module power supply circuit 22 stop output voltage V CCIO by the Enable signal according to the multimedia application demand, thereby make SOC (system on a chip) SOC turn back to holding state; If function key Key2 is pressed because R1＜＜R2, pin FUN_IN by the external belt electric resistance partial pressure after level near voltage VCCIO, representative state 2, status signal output " state 2 ", SOC (system on a chip) SOC sends response 2 after receiving " state 2 ", namely realizes adjusting function; If function key Key1 and function key Key2 are pressed simultaneously, then pin FUN_IN and resident voltage VO1 because the resident voltage VO1 of system residence power supply output is changed, may cause system to work near voltage VCCIO.
More than each state can represent with following form:
Figure BDA0000034030220000031
The shortcoming of this circuit is, altogether needs 3 SOC (system on a chip) SOC pins to realize 2 functions and power supply control, and the function of realization is few and pins that need are many, and the function of some key mappings repeats or be invalid.In addition, SOC (system on a chip) SOC outside need carry out drop-down with resistance to pin or on draw effect, be unfavorable for the simplification of overall PCB.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of function control circuit, is intended to solve the problem such as board design complexity and function key unreasonable allocation in the prior art.
The embodiment of the invention is to realize like this, a kind of function control circuit, described circuit comprises power input unit, module power supply circuit, resident power circuit, multifunctional multiplexing pin FUN_PIN, function key Key1, function key Key2 and status signal maker, described function control circuit also comprise with the output terminal of described resident power circuit be connected the input end of multifunctional multiplexing pin FUN_PIN and be connected respectively, be used to described multifunctional multiplexing pin FUN_PIN that the pin power circuit of pin voltage is provided.
Another purpose of the embodiment of the invention is to provide a kind of multimedia equipment that comprises function control circuit, described function control circuit comprises power input unit, module power supply circuit, resident power circuit, multifunctional multiplexing pin FUN_PIN, function key Key1, function key Key2 and status signal maker, described function control circuit also comprise with the output terminal of described resident power circuit be connected the input end of multifunctional multiplexing pin FUN_PIN and be connected respectively, be used to described multifunctional multiplexing pin FUN_PIN that the pin power circuit of pin voltage is provided.
The embodiment of the invention is by adding the pin power circuit in the existing capability control circuit, the method that tradition is changed pin voltage is improved, removed and drawn/pull down resistor on needed in the prior art, the simplification of overall PCB is improved, and make SOC (system on a chip) SOC under holding state, still can produce response to the operation of function key, and optimize the configuration of function key.
Description of drawings
Fig. 1 is the structural drawing of existing function control circuit;
Fig. 2 is the structural drawing of existing another function control circuit;
Fig. 3 is the structural drawing of the function control circuit that provides of first embodiment of the invention;
Fig. 4 is the structural drawing of the function control circuit that provides of second embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the invention provides a kind of function control circuit, described circuit comprises power input unit, module power supply circuit, resident power circuit, multifunctional multiplexing pin FUN_PIN, function key Key1, function key Key2 and status signal maker, described function control circuit also comprise with the output terminal of described resident power circuit be connected the input end of multifunctional multiplexing pin FUN_PIN and be connected respectively, be used to described multifunctional multiplexing pin FUN_PIN that the pin power circuit of pin voltage is provided.
The embodiment of the invention is by adding the pin power circuit in the existing capability control circuit, the method that tradition is changed pin voltage is improved, removed and drawn/pull down resistor on needed in the prior art, the simplification of overall PCB is improved, and make SOC (system on a chip) SOC under holding state, still can produce response to the operation of function key, and optimize the configuration of function key.
Embodiment one:
Fig. 3 shows the structure of the function control circuit that first embodiment of the invention provides, and only shows for convenience of explanation the part relevant with the embodiment of the invention.
Wherein, power input unit 31 is used to module power supply circuit and resident power circuit that the work required voltage is provided.
Module power supply circuit 32, be connected with the output terminal of power input unit 31, be used for receiving the voltage of power input unit 31 and the control signal of resident power circuit 33, and provide the work required voltage to each functional module, the function control circuit that above-mentioned functions module and the embodiment of the invention provide belongs to the part in the multimedia equipment, is each operational module of realizing functions such as broadcast, memory and recording.
Resident power circuit 33, second input end of being connected with module power supply circuit with the output terminal of power input unit 31 is connected respectively, be used for the resident voltage of output, and send control signal to module power supply circuit 32, control module power circuit 32 anergies, making function control circuit is holding state, and control module power circuit 32 enables, and making function control circuit is duty.
As long as the input of power input unit 31 is arranged, resident power circuit 33 just has resident Voltage-output.As the example that the embodiment of the invention provides, the resident voltage of resident power circuit output is 1.2V under normal condition.Resident power circuit 33 can prevent that when function key Key1, function key Key2 press simultaneously electric current is excessive like this for having the circuit of current-limiting function, has also saved the non-essential resistance of PCB simultaneously.
Pin power circuit 34 is connected with the second input end of resident power circuit 33, is used for output pin voltage.Pin power circuit 34 can prevent that when function key is pressed electric current is excessive like this for having the circuit of current-limiting function, has also saved the non-essential resistance of PCB simultaneously.
Multifunctional multiplexing pin FUN_PIN, first end is connected with the output terminal of pin power circuit 34.
Multifunctional multiplexing pin as SOC (system on a chip) SOC, multifunctional multiplexing pin FUN_PIN is produced by pin power circuit 34, the input power of pin power circuit 34 is the resident voltage of resident power circuit 33 outputs, as long as resident power circuit 33 has resident Voltage-output, multifunctional multiplexing pin FUN_PIN just has Voltage-output.That is, as long as power input unit 31 has the voltage input, multifunctional multiplexing pin FUN_PIN just has Voltage-output.As the example that the embodiment of the invention provides, the voltage of multifunctional multiplexing pin FUN_PIN is 0.6V under the state that function key is not pressed.
In embodiments of the present invention, multifunctional multiplexing pin FUN_PIN not only can be used as power supply output but also can detect input as power supply.When as power supply output, its voltage is determined by pin power circuit 34; When detecting input as power supply, its voltage cooperates decision by resident power circuit 33 with function key Key1, function key Key2.
So in real work, when power supply when input arranged, by to the pressing or opening of function key Key1 and/or function key Key2, can change the voltage on the multifunctional multiplexing pin FUN_PIN, need not in circuit, to design and draw/pull down resistor.
Status signal maker 35, be connected with the detection voltage output end of multifunctional multiplexing pin FUN_PIN, status signal maker 35 can be comparer, particularly, can be voltage comparator or hysteresis loop comparator etc., the embodiment of the invention with voltage comparator as an example.Voltage comparator is connected with multifunctional multiplexing pin FUN_PIN first end, is used for the threshold value that pin voltage and voltage comparator are preset is compared, and to SOC (system on a chip) SOC output status signal.SOC (system on a chip) SOC makes different responses according to output status signal.The threshold voltage settings of voltage comparator does not need too accurate, as pressing as function key Key1, whether the voltage that voltage comparator needs only on many multiplexing functions pin FUN_PIN is higher than resident supply voltage and a middle value of pin output supply voltage, such as 0.9V.If the voltage on the multifunctional multiplexing pin FUN_PIN is higher than 0.9V, then functions key Key1 presses, and voltage comparator is exported corresponding status signal.Even so 0.9V this be worth deviation slightly can not affect voltage comparator to 0.95V or 0.85V output state.As pressing as function key Key2, whether the voltage that voltage comparator needs only on many multiplexing functions pin FUN_PIN is lower than pin output supply voltage and a middle value of 0V, such as 0.3V.If the voltage on the FUN_PIN is lower than in 0.3V, then functions key Key2 presses, and voltage comparator is exported corresponding status signal.Etc..
Function key Key1, an end is connected with resident power circuit 33, and the other end is connected with multifunctional multiplexing pin FUN_PIN the second end.
Function key Key2, an end is connected other end ground connection with multifunctional multiplexing pin FUN_PIN the second end.
Wherein, module power supply circuit 32, resident power circuit 33, pin power circuit 34 and comparer 35 are integrated among the SOC (system on a chip) SOC.
In real work, power input unit 31 wherein will be exported resident voltage VO1 as long as power input unit 31, is resided power circuit 33 to resident power circuit 33 input voltages to module power supply circuit 32 and resident power circuit 33 input voltages.And module power supply circuit 32 is by the control of the Enable signal (enable signal) of resident power circuit 33 outputs, in SOC (system on a chip) SOC chip and each functional module of SOC (system on a chip) SOC chip exterior (as: GPIO module, memory module etc.) output voltage V CCIO or stop the output of voltage VCCIO.
When Enable signal controlling module power supply circuit 32 anergy, the resident voltage of resident power circuit 33 outputs is only arranged, this state is holding state.When circuit is holding state, because resident power circuit 33 is still exported resident voltage, so the pin power circuit still has Voltage-output, correspondingly, multifunctional multiplexing pin FUN_PIN also has Voltage-output, so under holding state, still can change by the switching of function key the voltage of multifunctional multiplexing pin FUN_PIN, thereby make SOC (system on a chip) SOC produce response.
When Enable signal controlling module power supply circuit 32 enabled, module power supply circuit 32 and resident the power circuit 33 all state of output voltage were duty.
At holding state, when function key Key1 and function key Key2 are not pressed, multifunctional multiplexing pin FUN_PIN level is 0.6V, representative state 0, and comparer 35 output " state 0 " signals, SOC (system on a chip) SOC does not send any response; Key2 is pressed when function key, and multifunctional multiplexing pin FUN_PIN level is 0V, representative state 1.Comparer 35 output " state 1 " signals, SOC (system on a chip) SOC sends response 1 after receiving " state 1 " signal, makes resident power circuit 33 produce voltage VCCIO output by Enable signal controlling module power supply circuit 32, thereby realizes the function that powers on; Key1 is pressed when function key, and multifunctional multiplexing pin FUN_PIN level is 1.2V, representative state 2, and status signal output " state 2 " signal, SOC (system on a chip) SOC sends response 2 after receiving " state 2 " signal.Response 2 can be adjusting function, adjusting function can corresponding multimedia system in by any function of program setting, such as volume adjusting or screen intensity adjusting etc., response 2 also can correspond to the reset function of SOC (system on a chip) SOC, be the hardware reset multimedia system, and do not need software program to do anything; If function key Key1 and function key Key2 are pressed simultaneously, then the resident voltage VO1 of multifunctional multiplexing pin FUN_PIN and 33 outputs of resident power circuit is 0V, be equivalent to the power supply input is disconnected, being equivalent to power supply after function key is decontroled re-enters, be equivalent to system and re-power, realize the function of restarting.
In working order, when function key Key1 and function key Key2 are not pressed, multifunctional multiplexing pin FUN_PIN level is 0.6V, representative state 3, and comparer 35 output " state 3 " signals, SOC (system on a chip) SOC does not send any response; Key2 is pressed when function key, and multifunctional multiplexing pin FUN_PIN level is 0V, representative state 4, comparer 35 output " state 4 " signals.SOC (system on a chip) SOC sends response 4 after receiving " state 4 ", SOC (system on a chip) SOC can realize playing function or make module power supply circuit 32 stop output voltage V CCIO by the Enable signal according to the multimedia application demand, make SOC (system on a chip) SOC turn back to holding state; Key1 is pressed when function key, and multifunctional multiplexing pin FUN_PIN level is 1.2V, representative state 5, and comparer 35 output " state 5 " signals, SOC (system on a chip) SOC sends response 5 after receiving " state 5 " signal.Response 5 can be adjusting function, adjusting function can corresponding multimedia system in by any function of program setting, such as volume adjusting or screen intensity adjusting etc., response 5 also can correspond to the reset function of SOC (system on a chip) SOC, be the hardware reset multimedia system, and do not need software program to do anything; If function key Key1 and function key Key2 are pressed simultaneously, then the resident voltage VO1 of the voltage of multifunctional multiplexing pin FUN_PIN and 33 outputs of resident power circuit is 0V, be equivalent to the power supply input is disconnected, being equivalent to power supply after function key is decontroled re-enters, be equivalent to system and re-power, realize restarting function.
More than each state can represent with following form:
Figure BDA0000034030220000081
Figure BDA0000034030220000091
The embodiment of the invention is by adding the pin power circuit in the existing capability control circuit, the method that tradition is changed pin voltage is improved, and has removed and has drawn/pull down resistor on needed in the prior art, and the simplification of overall PCB is improved.And make SOC (system on a chip) SOC under holding state, still can produce response to the operation of function key, optimized the configuration of function key.And the usage comparison device replaces traditional ADC chip, avoided using reference voltage and the function that causes is intersected wrong risk.
Embodiment two:
In embodiments of the present invention, module power supply circuit 32 can be that the linear voltage stabilization source control circuit also can be switching power source control circuit.
Embodiment three:
In embodiments of the present invention, resident power circuit 33 and pin power circuit 34 are for having the power generation circuit of current-limiting function, can be the linear voltage stabilization source control circuit, also can be resistor voltage divider circuit, also can be operated in the metal-oxide-semiconductor circuit in variable resistor district, also can be for being operated in the bipolar transistor circuit of saturation region, its maximum output current can be limited in hundreds of microampere or several milliamperes.
Embodiment four:
Fig. 4 shows the structure of the function control circuit that second embodiment of the invention provides, and only shows for convenience of explanation the part relevant with the embodiment of the invention.
In embodiments of the present invention, pin power circuit 34 in above-described embodiment can be the resistor voltage divider circuit that is comprised of divider resistance R1 and divider resistance R2, wherein, the first end of divider resistance R1 is connected between resident power circuit 33 and the function key Key1, and the second end of divider resistance R1 is connected between comparer 35 and the multifunctional multiplexing pin FUN_PIN; The first end of divider resistance R2 is connected the second end ground connection of divider resistance R2 by the second end of divider resistance R1 and the node of comparer 35 with the second end of divider resistance R1.And the ratio of resistance R 1 and resistance R 2 is greater than 100Kohm.
Embodiment five:
The function control circuit that provides in the embodiment of the invention can be widely used in the various multimedia equipments such as MP3, sound-track engraving apparatus.
The beneficial effect of the embodiment of the invention is:
1, by add the pin power circuit in the existing capability control circuit, the method that tradition is changed pin voltage is improved, and has removed and has drawn/pull down resistor on needed in the prior art, and the simplification of overall PCB is improved
2, under holding state, resident power circuit still has electricity, and namely the pin power circuit also just has electricity, so under holding state, SOC (system on a chip) SOC still can produce response to the operation of function key.
3, further optimized the functional configuration of function key under the duty.
4, the usage comparison device replaces traditional signal condition maker, has avoided using reference voltage and the function that causes is intersected wrong risk.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. function control circuit, comprise power input unit, module power supply circuit, resident power circuit, multifunctional multiplexing pin FUN_PIN, function key Key1, function key Key2 and status signal maker, it is characterized in that described function control circuit also comprises:
Also comprise with the output terminal of described resident power circuit be connected the input end of multifunctional multiplexing pin FUN_PIN and be connected respectively, be used to described multifunctional multiplexing pin FUN_PIN that the pin power circuit of pin voltage is provided;
Described module power supply circuit is used for being subject to control signal control that described resident power circuit sends and anergy or enable;
When described module power supply circuit anergy, described function control circuit is holding state, and described resident power circuit, described pin power circuit and described multifunctional multiplexing pin FUN_PIN have Voltage-output;
When described module power supply circuit enabled, described function control circuit was duty, and described resident power circuit, described module power supply circuit, described pin power circuit and described multifunctional multiplexing pin FUN_PIN have Voltage-output.
2. function control circuit as claimed in claim 1 is characterized in that, described module power supply circuit is linear voltage stabilization source control circuit or switching power source control circuit.
3. function control circuit as claimed in claim 1 is characterized in that, described resident power circuit and described pin power circuit are the power generation circuit with current-limiting function.
4. function control circuit as claimed in claim 3, it is characterized in that described power generation circuit with current-limiting function is linear voltage stabilization source control circuit, perhaps resistor voltage divider circuit, perhaps be operated in the metal-oxide-semiconductor circuit in variable resistor district, perhaps be operated in the bipolar transistor circuit of saturation region.
5. function control circuit as claimed in claim 4 is characterized in that, described resistor voltage divider circuit comprises divider resistance R1 and divider resistance R2;
The first end of described divider resistance R1 is connected between described resident power circuit and the described function key Key1, and the second end of described divider resistance R1 is connected between described comparer and the described multifunctional multiplexing pin FUN_PIN;
The first end of described divider resistance R2 is connected the second end ground connection of described divider resistance R2 by the second end of described divider resistance R1 and the intersection point of described comparer with the second end of described divider resistance R1.
6. function control circuit as claimed in claim 1 is characterized in that, described status signal maker is voltage comparator or hysteresis loop comparator.
7. multimedia equipment that comprises each described function control circuit of claim 1 to 6.
CN 201010557431 2010-11-24 2010-11-24 Function control circuit and multimedia equipment Active CN102478787B (en)

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CN105376421A (en) * 2014-09-01 2016-03-02 深圳富泰宏精密工业有限公司 Apparatus of controlling current, system and method thereof
CN107182002B (en) * 2017-05-16 2020-02-07 苏州顺芯半导体有限公司 Realization device and realization method for recognizing audio output data format of analog-to-digital conversion chip

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DE10308027A1 (en) * 2003-02-24 2004-09-09 Brinkhus, Hartmut B., Dr. Interface circuit for process connections
CN1728554A (en) * 2004-07-30 2006-02-01 杭州华为三康技术有限公司 Circuit for configuring chip pins with multiplexing functions, and method for configuring chip pins with multiplexing functions
CN1889066A (en) * 2006-07-12 2007-01-03 北京中星微电子有限公司 Automatic switching device for complexing pin working mode

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10308027A1 (en) * 2003-02-24 2004-09-09 Brinkhus, Hartmut B., Dr. Interface circuit for process connections
CN1728554A (en) * 2004-07-30 2006-02-01 杭州华为三康技术有限公司 Circuit for configuring chip pins with multiplexing functions, and method for configuring chip pins with multiplexing functions
CN1889066A (en) * 2006-07-12 2007-01-03 北京中星微电子有限公司 Automatic switching device for complexing pin working mode

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