CN205596017U - Four ways output adjustable power management system by I2C control - Google Patents
Four ways output adjustable power management system by I2C control Download PDFInfo
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- CN205596017U CN205596017U CN201620373542.8U CN201620373542U CN205596017U CN 205596017 U CN205596017 U CN 205596017U CN 201620373542 U CN201620373542 U CN 201620373542U CN 205596017 U CN205596017 U CN 205596017U
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Abstract
The utility model provides a four ways output adjustable power management system by I2C control, including buck type DCDC that three load bearing capability is different, reference voltage and reference current production circuit, under -voltage & excess temperature protection circuit, oscillator circuit, LDO circuit, I2C control circuit, and a plurality of resistive voltage divider networks and inductance, input, output capacitance, I2C control circuit, control buck DCDC and LDO's start -up and shutoff to in certain extent adjusts buck DCDC and LDO's output voltage, reference voltage and reference current production circuit provide required reference voltage and internal current for circuit system, under -voltage & excess temperature protection circuit, when electric current in the circuit was too big, open circuit connected, it has played the guiding function to vibrate the circuit, thereby the different voltage output of four ways has been realized.
Description
Technical field
The present invention relates to power supply power or distribution management field, particularly relate to a kind of four tunnel output adjustable electric management systems controlled by I2C.
Background technology
In consumer electronics field, various electronic equipments are required for power supply and maintain, in the electronic equipment using DC source, portable set application is more and more extensive, the most highly integrated, less package count and less plate level space, just become a kind of urgent needs, and then it is more reasonable to be accomplished by one, simplifies efficient battery management system.Battery management system (BMS) mainly aims at the utilization rate that can improve battery, prevents battery from overcharge and overdischarge occur, extends the service life of battery, the state of monitoring battery.Existing battery management system, parts are various, bulky, structure is complicated, and big multivoltage output is fixing.I2C bus supports any IC production process (NMOS CMOS, bipolarity).Two lines---serial data (SDA) and serial clock (SCL) line are being connected between the device of bus information of transmitting.Each device has a unique Address Recognition, and can serve as a transmitter or receptor.It is obvious that lcd driver is a receptor, and memorizer the most both can receive and can send data.In addition to transmitters and receivers, device can also be counted as main frame or from machine when performing data transmission.Main frame is the device that the clock signal allowing transmission was transmitted and produced to the data of initialization bus.Now, any addressed device is considered as from machine.The invention provides a kind of highly integrated, plate level space that component count is few and less, control mode simple, utilize I2C bus marco four road out-put supply management circuit, four kinds of different voltages outputs and circuit protection can be realized.
Summary of the invention
Present invention achieves one, the four road out-put supply management systems highly integrated, assembly less, the I2C of simple in construction controls.
The four road out-put supplies management systems that concrete I2C controls, it is characterised in that: include different Buck type DC/DC, a reference voltage and reference current generating circuit, a under-voltage & thermal-shutdown circuit, a pierce circuit, a LDO circuit, an I2C control circuit and the some resistance pressure-dividing networks of three load capacities and inductance, input, output capacitance；Buck type DC/DC and LDO circuit that I2C control circuit is different from three respectively are connected, then outfan the most corresponding thereto connects, and control startup and the shutoff of Buck DC/DC and LDO, and regulate the output voltage of Buck DC/DC and LDO within the specific limits；Reference voltage and reference current generating circuit, Buck types DC/DC different from three respectively and LDO circuit are connected, then outfan the most corresponding thereto is connected as the reference voltage required for Circuits System provides and internal current；Buck type DC/DC and LDO circuit that one under-voltage & thermal-shutdown circuit is different from three respectively are connected, and when the electric current in circuit is excessive, disconnecting circuit connects, thus protection circuit system；Different from three respectively Buck type DC/DC of pierce circuit is connected；Wherein first passage Buck type DC/DC is connected with third channel Buck type DC/DC, and second channel Buck type DC/DC is connected with LDO circuit.
Described I2C bus is a kind of Serial Extension technology, uses a SDA data wire, adds the extension of SCL clock line transmission and peripheral components to complete data, and I2C is soft addressing to the addressing system of each node.
The method that present invention also offers the transmission of a kind of I2C bus control data:
(1), when SDA and SCL two signal line of I2C bus is simultaneously in high level, bus is in idle condition；
(2) clock line SCL is in high level, and the level on data wire SDA is pulled low signal enabling, and data transmission starts；
(3) data transfer phase, under the cooperation of SCL serial clock, serially transfers each data on SDA bit by bit；
(4) after receptor receives last byte, sending one and stop signal, clock line SCL keeps between high period, and SDA returns high level, a data transfer termination, and I2C bus will return idle condition.
Three Buck DC/DC can realize the voltage output of 3.3V voltage, 1.5V voltage, 1.2V, and each Buck DC/DC is by the power output tube of Buck, error amplifier, PWM comparator, agitator, current sampling circuit, slope compensation circuit, control logic circuit, PWM/PFM mode switching circuit, output stage drive circuit, a zero current detecting circuit and peak point current limits and the circuit such as short-circuit protection circuit is constituted.After I2C control Buck is allowed to work, soft starting circuit produces soft start voltage by constant current source to the charging of chip internal electric capacity, the ramp voltage of soft start first replaces reference voltage and feedback voltage V FB to compare, can effectively prevent surge current, after soft start voltage is raised to reference voltage, VBG voltage sends into error amplifier with VFB voltage, sampling and the slope compensation signal of result with inductive current are together sent into PWM comparator after processing by error amplifier, the result of PWM comparator sends into logic control circuit, the Power pipe of Buck is controlled by the drive circuit through output stage, by peripheral inductance, electric capacity and resistor voltage divider network respectively obtain 3.3V voltage, 1.5V voltage, the voltage output of 1.2V.And the zero current detecting circuit in circuit, by detecting LX node voltage, it is judged that Buck is in CCM pattern or DCM pattern, by opening and shutting off of logic control switch tube, prevents the reflux of inductive current；Also having peak point current protection and short-circuit protection function in circuit, prevent the electric current flowing through circuit excessive and the damage to internal components that causes, each Buck can realize the load capacity of more than 2A.
LDO circuit is made up of soft start voltage, the output pipe of LDO, output current limiting protection circuit and compensation network that error amplifier, NMOS are constituted.First; the soft starting circuit of LDO leads to the stepped-slope producing a stable slowly rising; after soft start voltage is raised to reference voltage; the ramp voltage of soft start is deactivated; VBG voltage sends into error amplifier with VFB voltage; the output of error amplifier controls the conducting of the output pipe of LDO; output voltage is made to ensure the output of 1.8V; the band that can be simultaneously reached 1A carries; system carries out current-limiting protection to LDO, and when load current is more than 1.3A, LDO enters automatic restarting mode; until after load current is normal, LDO recovers normal work.
Present invention also offers a kind of Buck DC/DC circuit, limit and short-circuit protection circuit including an error amplifier, PWM comparator, agitator, current sampling circuit, slope compensation circuit, control logic circuit, PWM/PFM mode switching circuit, output stage drive circuit, the power output tube of Buck, zero current detecting circuit and peak point current.Described Buck DC/DC circuit error amplifier in is connected with VBG, VFB; outfan is connected with comparator PWM; two other port of comparator input terminal difference one is connected with control logic circuit by slope compensation circuit; another is connected with PWM/PFM mode switching circuit by current sample and peak point current limits and short-circuit protection circuit is connected, and comparator output terminal is connected with control logic circuit；Control logic circuit Single port is connected with agitator; another port is connected with earth potential by zero current detecting circuit; control logic circuit also limits with peak point current and short-circuit protection is connected, and output stage drives and is connected with peak point current restriction and short-circuit protection, zero current detecting circuit, power output tube.nullChip internal electric capacity is charged by the soft starting circuit of described Buck DC/DC by constant current source，Produce a stable stepped-slope slowly risen，After soft start voltage is raised to reference voltage，The ramp voltage of soft start is deactivated，VBG voltage and VFB voltage are admitted to error amplifier，Sampling and the slope compensation signal of result with inductive current are together sent into PWM comparator after processing by error amplifier，The result of PWM comparator sends into logic control circuit，The Power pipe of Buck is controlled by the drive circuit through output stage，By peripheral inductance、Electric capacity and resistor voltage divider network obtain output voltage，And the zero current detecting circuit in circuit，By LX node voltage is detected，Judge that Buck is in CCM pattern or DCM pattern，By opening and shutting off of logic control switch tube.
In LDO circuit of the present invention, output pipe can be also NMOS.
Accompanying drawing explanation
Fig. 1 is a kind of four tunnel output regulated power supply administrative unit circuit diagrams controlled by I2C；
Fig. 2 is the system construction drawing of Buck type DC/DC in system；
Fig. 3 is the system construction drawing of LDO in system；
Fig. 4 is the control sequential chart of I2C in system.
Detailed description of the invention
In order to make those skilled in the art can be further understood that inventive feature and technology contents, with embodiment, the embodiment of the present invention is elaborated below in conjunction with the accompanying drawings.
The four road out-put supplies management systems controlled such as this I2C of Fig. 1, including different Buck type DC/DC, a reference voltage and the reference current generating circuit of three load capacities, under-voltage & thermal-shutdown circuit, pierce circuit, Power pipe be the LDO circuit of NMOS, an I2C control circuit and some resistance pressure-dividing networks and inductance, input, output capacitance；Buck type DC/DC and LDO circuit that I2C control circuit is different from three respectively are connected, then outfan the most corresponding thereto connects, and control startup and the shutoff of Buck DC/DC and LDO, and regulate the output voltage of Buck DC/DC and LDO within the specific limits；Reference voltage and reference current generating circuit, Buck types DC/DC different from three respectively and LDO circuit are connected, then outfan the most corresponding thereto is connected as the reference voltage required for Circuits System provides and internal current；Buck type DC/DC and LDO circuit that one under-voltage & thermal-shutdown circuit is different from three respectively are connected, and when the electric current in circuit is excessive, disconnecting circuit connects, thus protection circuit system；Different from three respectively Buck type DC/DC of pierce circuit is connected；Wherein first passage Buck type DC/DC is connected with third channel Buck type DC/DC, and second channel Buck type DC/DC is connected with LDO circuit.Reference voltage current circuit is connected with first passage Buck type DC/DC, I2C control circuit, under-voltage & thermal-shutdown circuit, oscillator circuit, realizes 3.3 outputs through peripheral capacitor and inductor.Wherein first passage Buck type DC/DC is connected with electric capacity C1 one end and resistance R1 by inductance L1；First passage Buck type DC/DC another connect end is connected with in the middle part of resistance R1, R2 again, R2 be connected with the electric capacity C1 other end finally realize voltage export 3.3V export.
The four road out-put supplies management systems that I2C controls, including different Buck type DC/DC, a reference voltage and the reference current generating circuit of three load capacities, under-voltage & thermal-shutdown circuit, pierce circuit, Power pipe be the LDO circuit of NMOS, an I2C control circuit and some resistance pressure-dividing networks and inductance, input, output capacitance；Buck type DC/DC and LDO circuit that I2C control circuit is different from three respectively are connected, then outfan the most corresponding thereto connects, and control startup and the shutoff of Buck DC/DC and LDO, and regulate the output voltage of Buck DC/DC and LDO within the specific limits；Reference voltage and reference current generating circuit, Buck types DC/DC different from three respectively and LDO circuit are connected, then outfan the most corresponding thereto is connected as the reference voltage required for Circuits System provides and internal current；Buck type DC/DC and LDO circuit that one under-voltage & thermal-shutdown circuit is different from three respectively are connected, and when the electric current in circuit is excessive, disconnecting circuit connects, thus protection circuit system；Different from three respectively Buck type DC/DC of pierce circuit is connected；Wherein first passage Buck type DC/DC is connected with third channel Buck type DC/DC, and second channel Buck type DC/DC is connected with LDO circuit.Reference voltage current circuit is connected with second channel Buck type DC/DC, I2C control circuit, under-voltage & thermal-shutdown circuit, oscillator circuit, realizes 3.0V output through peripheral capacitor and inductor.Wherein second channel Buck type DC/DC is connected with electric capacity C2 one end and R3 by inductance L2, second channel Buck type DC/DC another connect end and be connected with in the middle part of resistance R3, R4 again, R4 is connected with the electric capacity C2 other end and finally realizes voltage and export 3.0V and export.
The four road out-put supplies management systems that I2C controls, including different Buck type DC/DC, a reference voltage and the reference current generating circuit of three load capacities, under-voltage & thermal-shutdown circuit, pierce circuit, Power pipe be the LDO circuit of NMOS, an I2C control circuit and some resistance pressure-dividing networks and inductance, input, output capacitance；Buck type DC/DC and LDO circuit that I2C control circuit is different from three respectively are connected, then outfan the most corresponding thereto connects, and control startup and the shutoff of Buck DC/DC and LDO, and regulate the output voltage of Buck DC/DC and LDO within the specific limits；Reference voltage and reference current generating circuit, Buck types DC/DC different from three respectively and LDO circuit are connected, then outfan the most corresponding thereto is connected as the reference voltage required for Circuits System provides and internal current；Buck type DC/DC and LDO circuit that one under-voltage & thermal-shutdown circuit is different from three respectively are connected, and when the electric current in circuit is excessive, disconnecting circuit connects, thus protection circuit system；Different from three respectively Buck type DC/DC of pierce circuit is connected；Wherein first passage Buck type DC/DC is connected with third channel Buck type DC/DC, and second channel Buck type DC/DC is connected with LDO circuit.Reference voltage current circuit is connected with second channel Buck type DC/DC, I2C control circuit, under-voltage & thermal-shutdown circuit, oscillator circuit, realizes 2V output through peripheral capacitor and inductor.Wherein second channel Buck type DC/DC is connected with electric capacity C2 one end and R3 by inductance L2, second channel Buck type DC/DC another connect end and be connected with in the middle part of resistance R3, R4 again, R4 is connected with the electric capacity C2 other end and finally realizes voltage and export 2V and export.
The four road out-put supplies management systems that I2C controls, including different Buck type DC/DC, a reference voltage and the reference current generating circuit of three load capacities, under-voltage & thermal-shutdown circuit, pierce circuit, Power pipe be the LDO circuit of NMOS, an I2C control circuit and some resistance pressure-dividing networks and inductance, input, output capacitance；Buck type DC/DC and LDO circuit that I2C control circuit is different from three respectively are connected, then outfan the most corresponding thereto connects, and control startup and the shutoff of Buck DC/DC and LDO, and regulate the output voltage of Buck DC/DC and LDO within the specific limits；Reference voltage and reference current generating circuit, Buck types DC/DC different from three respectively and LDO circuit are connected, then outfan the most corresponding thereto is connected as the reference voltage required for Circuits System provides and internal current；Buck type DC/DC and LDO circuit that one under-voltage & thermal-shutdown circuit is different from three respectively are connected, and when the electric current in circuit is excessive, disconnecting circuit connects, thus protection circuit system；Different from three respectively Buck type DC/DC of pierce circuit is connected；Wherein first passage Buck type DC/DC is connected with third channel Buck type DC/DC, and second channel Buck type DC/DC is connected with LDO circuit.Reference voltage current circuit is connected with second channel Buck type DC/DC, I2C control circuit, under-voltage & thermal-shutdown circuit, oscillator circuit, realizes 1.5V output through peripheral capacitor and inductor.Wherein second channel Buck type DC/DC is connected with electric capacity C2 one end and R3 by inductance L2, second channel Buck type DC/DC another connect end and be connected with in the middle part of resistance R3, R4 again, R4 is connected with the electric capacity C2 other end and finally realizes voltage and export 1.5V and export.
The four road out-put supplies management systems that I2C controls, including different Buck type DC/DC, a reference voltage and the reference current generating circuit of three load capacities, under-voltage & thermal-shutdown circuit, pierce circuit, Power pipe be the LDO circuit of NMOS, an I2C control circuit and some resistance pressure-dividing networks and inductance, input, output capacitance；Buck type DC/DC and LDO circuit that I2C control circuit is different from three respectively are connected, then outfan the most corresponding thereto connects, and control startup and the shutoff of Buck DC/DC and LDO, and regulate the output voltage of Buck DC/DC and LDO within the specific limits；Reference voltage and reference current generating circuit, Buck types DC/DC different from three respectively and LDO circuit are connected, then outfan the most corresponding thereto is connected as the reference voltage required for Circuits System provides and internal current；Buck type DC/DC and LDO circuit that one under-voltage & thermal-shutdown circuit is different from three respectively are connected, and when the electric current in circuit is excessive, disconnecting circuit connects, thus protection circuit system；Different from three respectively Buck type DC/DC of pierce circuit is connected；Wherein first passage Buck type DC/DC is connected with third channel Buck type DC/DC, and second channel Buck type DC/DC is connected with LDO circuit.Reference voltage current circuit is connected with first passage Buck type DC/DC, I2C control circuit, under-voltage & thermal-shutdown circuit, oscillator circuit, realizes 1.2V output through peripheral capacitor and inductor.Wherein third channel Buck type DC/DC is connected with electric capacity C3 one end and resistance R5 by inductance L3, third channel Buck type DC/DC another connect end and be connected with in the middle part of resistance R5, R6 again, R6 is connected with the electric capacity C3 other end and finally realizes voltage and export 1.2V and export.
The four road out-put supplies management systems that I2C controls, including different Buck type DC/DC, a reference voltage and the reference current generating circuit of three load capacities, under-voltage & thermal-shutdown circuit, pierce circuit, Power pipe be the LDO circuit of NMOS, an I2C control circuit and some resistance pressure-dividing networks and inductance, input, output capacitance；Buck type DC/DC and LDO circuit that I2C control circuit is different from three respectively are connected, then outfan the most corresponding thereto connects, and control startup and the shutoff of Buck DC/DC and LDO, and regulate the output voltage of Buck DC/DC and LDO within the specific limits；Reference voltage and reference current generating circuit, Buck types DC/DC different from three respectively and LDO circuit are connected, then outfan the most corresponding thereto is connected as the reference voltage required for Circuits System provides and internal current；Buck type DC/DC and LDO circuit that one under-voltage & thermal-shutdown circuit is different from three respectively are connected, and when the electric current in circuit is excessive, disconnecting circuit connects, thus protection circuit system；Different from three respectively Buck type DC/DC of pierce circuit is connected；Wherein first passage Buck type DC/DC is connected with third channel Buck type DC/DC, and second channel Buck type DC/DC is connected with LDO circuit.Described LDO circuit coordinates peripheral capacitor and inductor output voltage to be 1.8V.Its LDO circuit one end is connected with electric capacity C4 and resistance R7, and another connection end of LDO circuit is connected with in the middle part of resistance R7, R8 again, and R8 is connected with the electric capacity C4 other end, finally realizes voltage output 1.8V output.
Another embodiment of the present invention is the four road out-put supplies management systems that I2C controls, it is characterised in that: include different Buck type DC/DC, a reference voltage and the reference current generating circuit of three load capacities, under-voltage & thermal-shutdown circuit, pierce circuit, Power pipe be the LDO circuit of PMOS, an I2C control circuit and some resistance pressure-dividing networks and inductance, input, output capacitance；Buck type DC/DC and LDO circuit that I2C control circuit is different from three respectively are connected, then outfan the most corresponding thereto connects, and control startup and the shutoff of Buck DC/DC and LDO, and regulate the output voltage of Buck DC/DC and LDO within the specific limits；Reference voltage and reference current generating circuit, Buck types DC/DC different from three respectively and LDO circuit are connected, then outfan the most corresponding thereto is connected as the reference voltage required for Circuits System provides and internal current；Buck type DC/DC and LDO circuit that one under-voltage & thermal-shutdown circuit is different from three respectively are connected, and when the electric current in circuit is excessive, disconnecting circuit connects, thus protection circuit system；Different from three respectively Buck type DC/DC of pierce circuit is connected；Wherein first passage Buck type DC/DC is connected with third channel Buck type DC/DC, and second channel Buck type DC/DC is connected with LDO circuit.Thus in a circuit, complete four obstructed voltage outputs.Wherein first passage Buck type DC/DC is connected with electric capacity C1 one end and resistance R1 by inductance L1；First passage Buck type DC/DC another connect end is connected with in the middle part of resistance R1, R2 again, R2 be connected with the electric capacity C1 other end finally realize voltage export 3.3V export.Wherein second channel Buck type DC/DC is connected with electric capacity C2 one end and R3 by inductance L2, second channel Buck type DC/DC another connect end and be connected with in the middle part of resistance R3, R4 again, R4 is connected with the electric capacity C2 other end and finally realizes voltage and export 1.5V and export.Wherein third channel Buck type DC/DC is connected with electric capacity C3 one end and resistance R5 by inductance L3, third channel Buck type DC/DC another connect end and be connected with in the middle part of resistance R5, R6 again, R6 is connected with the electric capacity C3 other end and finally realizes voltage and export 1.2V and export.Its LDO circuit one end is connected with electric capacity C4 and resistance R7, and another connection end of LDO circuit is connected with in the middle part of resistance R7, R8 again, and R8 is connected with the electric capacity C4 other end, finally realizes voltage output 1.8V output.
Such as Fig. 2; present invention also offers a kind of Buck DC/DC circuit, limit and short-circuit protection circuit including an error amplifier, PWM comparator, agitator, current sampling circuit, slope compensation circuit, control logic circuit, PWM/PFM mode switching circuit, output stage drive circuit, the power output tube of Buck, zero current detecting circuit and peak point current.Described Buck DC/DC circuit error amplifier in is connected with VBG, VFB; outfan is connected with comparator PWM; two other port of comparator input terminal difference one is connected with control logic circuit by slope compensation circuit; another is connected with PWM/PFM mode switching circuit by current sample and peak point current limits and short-circuit protection circuit is connected, and comparator output terminal is connected with control logic circuit；Control logic circuit Single port is connected with agitator; another port is connected with earth potential by zero current detecting circuit; control logic circuit also limits with peak point current and short-circuit protection is connected, and output stage drives and is connected with peak point current restriction and short-circuit protection, zero current detecting circuit, power output tube.nullChip internal electric capacity is charged by the soft starting circuit of described Buck DC/DC by constant current source，Produce a stable stepped-slope slowly risen，After soft start voltage is raised to reference voltage，The ramp voltage of soft start is deactivated，VBG voltage and VFB voltage are admitted to error amplifier，Sampling and the slope compensation signal of result with inductive current are together sent into PWM comparator after processing by error amplifier，The result of PWM comparator sends into logic control circuit，The Power pipe of Buck is controlled by the drive circuit through output stage，By peripheral inductance、Electric capacity and resistor voltage divider network obtain output voltage，And the zero current detecting circuit in circuit，By LX node voltage is detected，Judge that Buck is in CCM pattern or DCM pattern，By opening and shutting off of logic control switch tube.
Such as Fig. 3, present invention also offers a kind of LDO circuit, be PMOS, output current limiting protection circuit including error amplifier, Power pipe and compensate network.LOD circuit error amplifier in is connected with VBG, VFB, compensates network and is parallel to input amplifier two ends, and output current-limiting circuit one end is connected with error amplifier output, and the other end is connected with power output tube.Chip internal electric capacity is charged by the soft starting circuit of LDO by constant current source, produce a stable stepped-slope slowly risen, after soft start voltage is raised to reference voltage, the ramp voltage of soft start is deactivated, VBG voltage sends into error amplifier with VFB voltage, the output of error amplifier controls the conducting of the output pipe of LDO, output voltage is made to ensure the output for setting voltage, stablizing of system is ensured by compensating network, and add output current limiting protection circuit, when LDO is in short-circuit condition, automatically the conducting degree of output pipe is adjusted, guarantee system current limliting is within setting electric current.
Present invention also offers a kind of LDO circuit, including error amplifier, Power pipe is for NMOS pipe, output current limiting protection circuit and compensates network.LOD circuit error amplifier in is connected with VBG, VFB, compensates network and is parallel to input amplifier two ends, and output current-limiting circuit one end is connected with error amplifier output, and the other end is connected with power output tube.Chip internal electric capacity is charged by the soft starting circuit of LDO by constant current source, produce a stable stepped-slope slowly risen, after soft start voltage is raised to reference voltage, the ramp voltage of soft start is deactivated, VBG voltage sends into error amplifier with VFB voltage, the output of error amplifier controls the conducting of the output pipe of LDO, output voltage is made to ensure the output for setting voltage, stablizing of system is ensured by compensating network, and add output current limiting protection circuit, when LDO is in short-circuit condition, automatically the conducting degree of output pipe is adjusted, guarantee system current limliting is within setting electric current.
In the present invention, in I2C control circuit, the device of I2C bus has different types of technique (CMOS, NMOS, PMOS, bipolarity), the level of logical zero (low) and logic 1 (high) is not fixing, it is determined by the associated level of power supply VCC, and often one data bit of transmission just produces a clock pulses.Transmitting data when, SDA line must keep stable in the high level period of clock, and the high or low level state of SDA only clock signal at SCL line could change when being low level.Initiateing and stop condition: when SCL line is high level, SDA line switches to low level from high level, and this situation represents initial conditions；When SCL line is high level, SDA line is switched to high level by low level, and this situation represents stop condition.Initial and stop condition is typically produced by main frame, and bus considered to be in busy state after initial conditions, and after certain period of stop condition, bus is considered to be again at idle condition.Repeating initial conditions if produced and do not produce stop condition, bus can be constantly in busy state, and initial conditions (S) now are functionally the same with repetition initial conditions (Sr).
Addressing to each node is soft addressing system, saves chip select line, and addressing byte SLAM of standard is 7, can address 127 unit.The depositor used in circuit has 5, first for controlling being switched on and off of Buck DC/DC and LDO, second changes in 3.19V to 4.4V interval for controlling the output voltage of first Buck DC/DC, 3rd changes in 1.45V to 2V interval for controlling the output voltage of second Buck DC/DC, 4th changes in 1.16V to 1.6V interval for controlling the output voltage of the 3rd Buck DC/DC, and the 5th changes in 1.74V to 2.4V interval for controlling the output voltage of LDO.
When concrete SDA and SCL two signal line that I2C bus control method of the present invention is bus is simultaneously in high level, for the idle condition of bus.Keeping between high period at clock line SCL, the level on data wire SDA is pulled low (i.e. bearing saltus step), is defined as the enabling signal of I2C bus bus, and it indicates the beginning of a data transfer, i.e. enters START CONDITION.During data transfer state, each data transmitted in I2C bus have a clock pulses corresponding (or Synchronization Control), i.e. under the cooperation of SCL serial clock, serially transfer each data on SDA bit by bit.When carrying out data transmission, presenting between high period at SCL, the level on SDA must keep stable, and low level is data 0, and high level is data 1.It is only between low period at SCL, just allows the level on SDA to change state.The level of logical zero is low-voltage, and the level of logic 1 is high voltage.All data in bus all transmit with octet, and transmitter often sends a byte, just discharges data wire during clock pulses 9, receptor feeds back an answer signal.When answer signal is low level, it is stipulated that for effective response position (ACK is called for short response bits), represent that receptor has been successfully received this byte.If receptor is main controller, then after it receives last byte, send a NACK signal, to notify that controlled transmitter terminates data and sends, and discharge SDA line, in order to master control receptor sends one and stops signal.Keeping between high period at clock line SCL, data wire SDA is released so that SDA returns high level, the stopping signal of referred to as I2C bus, and it indicates that the termination of a data transfer, I2C bus will return idle condition.When clock line SCL keeps between high period, and the level on data wire SDA is pulled low (i.e. bearing saltus step) again, and I2C bus is again started up, and data transmission starts, and i.e. enters START CONDITION.During data transfer state, each data transmitted in I2C bus have a clock pulses corresponding (or Synchronization Control), i.e. under the cooperation of SCL serial clock, serially transfer each data on SDA bit by bit.When carrying out data transmission, presenting between high period at SCL, the level on SDA must keep stable, and low level is data 0, and high level is data 1.It is only between low period at SCL, just allows the level on SDA to change state.The level of logical zero is low-voltage, and the level of logic 1 is high voltage.All data in bus all transmit with octet, and transmitter often sends a byte, just discharges data wire during clock pulses 9, receptor feeds back an answer signal.When answer signal is low level, it is stipulated that for effective response position (ACK is called for short response bits), represent that receptor has been successfully received this byte.If receptor is main controller, then after it receives last byte, send a NACK signal, to notify that controlled transmitter terminates data and sends, and discharge SDA line, in order to master control receptor sends one and stops signal.Keeping between high period at clock line SCL, data wire SDA is released so that SDA returns high level, the stopping signal of referred to as I2C bus, and it indicates that the termination of a data transfer, I2C bus will return idle condition.The transmission carrying out signal so circulated and the control of circuit signal.
Claims (9)
1. the four road out-put supply management systems that an I2C controls, it is characterised in that: include
Buck type DC/DC, a reference voltage and the reference current generation that three load capacities are different
Circuit, under-voltage & thermal-shutdown circuit, pierce circuit, LDO circuit,
One I2C control circuit and some resistance pressure-dividing networks and inductance, input, output capacitance；
Buck type DC/DC and LDO circuit that I2C control circuit is different from three respectively are connected, then
Four outfans the most corresponding thereto connect；Reference voltage and reference current generating circuit,
Buck types DC/DC different from three respectively and LDO circuit are connected, more corresponding thereto
Four outfans answered connect；One under-voltage & thermal-shutdown circuit is different from three respectively
Buck type DC/DC and LDO circuit are connected；The Buck that pierce circuit is different from three respectively
Type DC/DC is connected；Wherein first passage Buck type DC/DC and third channel Buck type DC/DC
Being connected, second channel Buck type DC/DC is connected with LDO circuit.
The four road out-put supply management systems that a kind of I2C the most according to claim 1 controls
System, it is characterised in that: described I2C bus is a kind of Serial Extension technology, uses a SDA
Data wire, adds the extension of SCL clock line transmission and peripheral components to complete data, I2C
Addressing system to each node is soft addressing.
The four road out-put supply management systems that a kind of I2C the most according to claim 1 controls
System, it is characterised in that: described Buck type DC/DC circuit includes power output tube, a mistake
Difference amplifier, PWM comparator, agitator, current sampling circuit, one
Slope compensation circuit, control logic circuit, PWM/PFM mode switching circuit, one
Individual output stage drive circuit, zero current detecting circuit and peak point current limit and short-circuit protection circuit.
The four road out-put supply management systems that a kind of I2C the most according to claim 2 controls
System, it is characterised in that: described first passage Buck type DC/DC coordinates peripheral capacitor and inductor defeated
Going out voltage is 3.3V.
The four road out-put supply management systems that a kind of I2C the most according to claim 2 controls
System, it is characterised in that: described second channel Buck type DC/DC coordinates peripheral capacitor and inductor defeated
Going out voltage is 1.5V.
The four road out-put supply management systems that a kind of I2C the most according to claim 2 controls
System, it is characterised in that: described third channel Buck type DC/DC coordinates peripheral capacitor and inductor defeated
Going out voltage is 1.2V.
The four road out-put supply management systems that a kind of I2C the most according to claim 1 controls
System, it is characterised in that: described LDO circuit is by soft start voltage, error amplifier, output work
Rate pipe, output current limiting protection circuit and compensation network are constituted.
The four road out-put supply management systems that a kind of I2C the most according to claim 7 controls
System, it is characterised in that: in described LDO circuit, output pipe is NMOS.
The four road out-put supply management systems that a kind of I2C the most according to claim 8 controls
System, it is characterised in that: described LDO circuit coordinates peripheral capacitor and inductor output voltage to be 1.8V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620373542.8U CN205596017U (en) | 2016-04-28 | 2016-04-28 | Four ways output adjustable power management system by I2C control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620373542.8U CN205596017U (en) | 2016-04-28 | 2016-04-28 | Four ways output adjustable power management system by I2C control |
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| Publication Number | Publication Date |
|---|---|
| CN205596017U true CN205596017U (en) | 2016-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620373542.8U Active CN205596017U (en) | 2016-04-28 | 2016-04-28 | Four ways output adjustable power management system by I2C control |
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| Country | Link |
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| CN (1) | CN205596017U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915050A (en) * | 2016-04-28 | 2016-08-31 | 西安航天民芯科技有限公司 | I2C controlled four-channel outputting adjustable power supply managing system |
| CN107069890A (en) * | 2017-06-02 | 2017-08-18 | 江苏万邦微电子有限公司 | A kind of power-supply management system of single-chip portable electronic |
| CN117420347A (en) * | 2023-12-19 | 2024-01-19 | 西安航天民芯科技有限公司 | Zero-crossing current detection circuit of DC-DC converter |
-
2016
- 2016-04-28 CN CN201620373542.8U patent/CN205596017U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915050A (en) * | 2016-04-28 | 2016-08-31 | 西安航天民芯科技有限公司 | I2C controlled four-channel outputting adjustable power supply managing system |
| CN107069890A (en) * | 2017-06-02 | 2017-08-18 | 江苏万邦微电子有限公司 | A kind of power-supply management system of single-chip portable electronic |
| CN117420347A (en) * | 2023-12-19 | 2024-01-19 | 西安航天民芯科技有限公司 | Zero-crossing current detection circuit of DC-DC converter |
| CN117420347B (en) * | 2023-12-19 | 2024-02-20 | 西安航天民芯科技有限公司 | Zero-crossing current detection circuit of DC-DC converter |
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