CN206498521U

CN206498521U - The power control circuit waken up using earphone interface

Info

Publication number: CN206498521U
Application number: CN201621355944.1U
Authority: CN
Inventors: 张毅; 刘柏良; 黎俊
Original assignee: Sichuan Changhong Electric Co Ltd
Current assignee: Sichuan Changhong Electric Co Ltd
Priority date: 2016-12-09
Filing date: 2016-12-09
Publication date: 2017-09-15
Anticipated expiration: 2026-12-09

Abstract

The utility model discloses the power control circuit that a kind of utilization earphone interface wakes up, it includes charge management circuit, switching power circuit, CTIA, OMTP automatic identification circuits and headset plug circuit, the charge management circuit is electrically connected with switching power circuit, the switching power circuit is electrically connected with headset plug circuit, the headset plug and CTIA, OMTP automatic identification circuits are electrically connected, the utility model provides an external headset plug circuit, as long as Earphone joint insertion CTIA or OMTP equipment is (for example, mobile phone), the circuit wake-up device can just be passed through, thus accomplished equipment when not in use MCU be in be completely switched off state, so thoroughly reduce system power dissipation, the small hardware of intelligence is set to result in longer endurance, and the battery of more low capacity can be used, so as to reduce equipment volume.

Description

The power control circuit waken up using earphone interface

Technical field

The utility model is related to, and in particular to the power control circuit that a kind of utilization earphone interface wakes up.

Background technology

Now as its periphery smart accessories that develop rapidly of smart mobile phone, tablet personal computer are also quickly grown, earphone interface Provided communication interface and structure strong ties, such as intelligent infant clinical thermometer, Intelligent water meter, minisize wind speed instrument, water quality The equipment such as detector all occur in that the application of earphone interface communication interface and structure strong ties, but these equipment analog circuit, It is difficult to accomplish by earphone interface or so sound under digital circuit, sensor, DC-DC losses, many power consumption pressure of switching loss The Weak current driving equipment work that road is provided, so button cell, chargeable lithium cell will be supplied as the energy of equipment, from And the size of equipment and the endurance of battery by be smart machine a big bottleneck, therefore power consumption control will be particularly important.

And the existing Enable and Disable that allow MCU to remove control DC-DC are required for MCU to work always, such observable index Higher, while also increasing circuit complexity, even with MCU timing wake-ups, the kernel of its equipment also works always, in order to Ultimate attainment power consumption control is reached, earphone hole insertion is undoubtedly settling mode least in power-consuming.

Utility model content

The utility model overcomes the deficiencies in the prior art, and there is provided the power consumption control electricity that a kind of utilization earphone interface wakes up Road.

To achieve the above object, the utility model uses following technical scheme：

The power control circuit that a kind of utilization earphone interface wakes up, it include charge management circuit, switching power circuit, CTIA, OMTP automatic identification circuit and headset plug circuit, the charge management circuit is electrically connected with switching power circuit, described Switching power circuit is electrically connected with headset plug circuit, and the headset plug is electrically connected with CTIA, OMTP automatic identification circuit；Institute Stating charge management circuit includes Micro USB plugs, charging management chip IC1, charging indicator light LED1 and lithium battery, described to open Powered-down source circuit include switching power source chip IC2 and switching tube Q2, CTIA, OMTP automatic identification circuit include CTIA, OMTP automatic discriminations chip IC 3, the headset plug circuit includes headset plug interface；The VBUS of the Micro USB plugs Pin is electrically connected by fuse F1 with charging management chip IC1 IN pins, the CHGZ pins of the charging management chip IC1 Electrically connected with charging indicator light LED1, the charging indicator light LED1 is managed by resistance R1 and charging management chip IC1 BATT Pin is electrically connected, and the IPGM pins of the charging management chip IC1 are grounded by resistance R2, and the lithium battery is articulated to Charge Management On the BATT pins of chip IC 1；The VIN pins of the switching power source chip IC2 are connected with lithium battery, the Switching Power Supply core Piece IC2 EN pins are electrically connected by switching tube Q1 with the R_OUT pins of headset plug interface, the switching power source chip IC2 OUT pins electrically connected with load circuit, the BP pins of the switching power source chip IC2 are grounded by electric capacity C1；The CTIA, The 2Y1 pins and 1Y0 pins of OMTP automatic discriminations chip IC 3 are electrically connected with the GND_MIC pins of headset plug interface respectively, institute State the MIC_GND pins electricity of the 2Y0 pins and 1Y1 pins of CTIA, OMTP automatic discrimination chip IC 3 respectively with headset plug interface Connection.

It is preferred that, the resistance of the resistance R1 is 330 Ω -1K Ω.

Compared with prior art, the beneficial effects of the utility model are：

The utility model provides an external headset plug circuit, as long as Earphone joint inserts CTIA or OMTP equipment (for example, mobile phone), just can by the circuit wake-up device, thus accomplished equipment when not in use MCU be in be completely switched off State, so thoroughly reduces system power dissipation, the small hardware of intelligence is resulted in longer endurance, and can use smaller The battery of capacity, so as to reduce equipment volume.

Brief description of the drawings

The circuit theory for the power control circuit that Fig. 1 wakes up for a kind of utilization earphone interface of embodiment of the utility model Figure.

Embodiment

The utility model is further elaborated below in conjunction with the accompanying drawings.

The power control circuit that utilization earphone interface as shown in Figure 1 wakes up, it is characterised in that it includes Charge Management electricity Road 1, switching power circuit 2, CTIA, OMTP automatic identification circuit 3 and headset plug circuit 4, charge management circuit 1 and switch electricity Source circuit 2 is electrically connected, and switching power circuit 2 is electrically connected with headset plug circuit 4, headset plug 4 and CTIA, OMTP automatic discrimination Circuit 3 is electrically connected；Charge management circuit 1 includes Micro USB plugs, charging management chip IC1, charging indicator light LED1 and lithium Battery, switching power circuit 2, which includes switching power source chip IC2 and switching tube Q2, CTIA, OMTP automatic identification circuit 3, to be included CTIA, OMTP automatic discrimination chip IC 3, headset plug circuit 4 includes headset plug interface；The VBUS pipes of Micro USB plugs Pin is electrically connected by fuse F1 with charging management chip IC1 IN pins, charging management chip IC1 CHGZ pins and charging Indicator lamp LED1 is electrically connected, and charging indicator light LED1 is electrically connected with charging management chip IC1 BATT pins by resistance R1, filled The IPGM pins of fulgurite reason chip IC 1 are grounded by resistance R2, and lithium battery is articulated to charging management chip IC1 BATT pins On；Switching power source chip IC2 VIN pins are connected with lithium battery, and switching power source chip IC2 EN pins pass through switching tube Q1 Electrically connect, switching power source chip IC2 OUT pins are electrically connected with load circuit, switch with the R_OUT pins of headset plug interface Power supply chip IC2 BP pins are grounded by electric capacity C1；The 2Y1 pins and 1Y0 pins of CTIA, OMTP automatic discrimination chip IC 3 Electrically connected respectively with the GND_MIC pins of headset plug interface, the 2Y0 pins and 1Y1 of CTIA, OMTP automatic discrimination chip IC 3 Pin is electrically connected with the MIC_GND pins of headset plug interface respectively.

Circuit theory of the present utility model is as follows：

When electric quantity of lithium battery is not enough, external charger insertion Micro USB plugs, by IC1 pairs of charging management chip Lithium battery is charged, when lithium battery can normal work when (voltage is between 3.7v-4.2v), now headset plug interface insert Enter movable equipment, CTIA, OMTP automatic identification circuit 3 is different according to the output voltage of CTIA, OMTP standard device, carries out certainly It is dynamic to judge, when the voltage that CTIA, OMTP automatic discrimination chip IC 3 detects the GND_MIC pins from headset plug interface is high The corresponding Earphone joint of movable equipment is then judged as PIN4 MIC in the voltage of the MIC_GND pins of headset plug interface, PIN3 GND are the equipment for the standard that this equipment is CTIA.When CTIA, OMTP automatic discrimination chip IC 3 is detected from earphone The voltage of the MIC_GND pins of plug interface then judges removable set higher than the voltage of the GND_MIC pins of headset plug interface Standby corresponding Earphone joint is PIN3 MIC, and PIN4 GND are the equipment for the standard that this equipment is OMTP, according to the knot of judgement Really, CTIA, OMTP automatic discrimination chip IC 3 is communicated according to CTIA, OMTP agreement auto negotiation, when the insertion of headset plug interface A stable low level will be presented in the R_OUT pins of headset plug interface after CTIA or OMTP equipment, and this low level will be dragged down Switching tube Q1 turns on switching tube Q1, and at this moment switching power source chip IC2 EN pins are high level, and switching power circuit 2 starts Workload circuit will be waken up, the R_ of the headset plug interface on the contrary after headset plug interface extracts CTIA or OMTP equipment OUT pins will be hanging, and switching tube Q1 is closed, and switching power source chip IC2 EN pins are pulled down resistance and dragged down, switching power circuit 2 shut-offs, load circuit is closed.

Essence of the present utility model is described in detail above embodiment, but can not be to of the present utility model Protection domain is limited, it should be apparent that, under enlightenment of the present utility model, the art those of ordinary skill can be with Carry out many improvement and modification, it should be noted that these are improved and modification all falls in claim of the present utility model protection Within the scope of.

Claims

1. the power control circuit that a kind of utilization earphone interface wakes up, it is characterised in that it includes charge management circuit (1), opened Powered-down source circuit (2), CTIA, OMTP automatic identification circuit (3) and headset plug circuit (4), the charge management circuit (1) with Switching power circuit (2) is electrically connected, and the switching power circuit (2) electrically connects with headset plug circuit (4), the headset plug Circuit (4) is electrically connected with CTIA, OMTP automatic identification circuit (3)；

The charge management circuit (1) includes Micro USB plugs, charging management chip IC1, charging indicator light LED1 and lithium electricity Pond, the switching power circuit (2) includes switching power source chip IC2 and switching tube Q2, CTIA, OMTP automatic identification circuit (3) CTIA, OMTP automatic discrimination chip IC 3 is included, the headset plug circuit (4) includes headset plug interface；

The VBUS pins of the Micro USB plugs are electrically connected by fuse F1 with charging management chip IC1 IN pins, institute The CHGZ pins for stating charging management chip IC1 are electrically connected with charging indicator light LED1, and the charging indicator light LED1 passes through resistance R1 is electrically connected with charging management chip IC1 BATT pins, and the IPGM pins of the charging management chip IC1 are connect by resistance R2 Ground, the lithium battery is articulated on charging management chip IC1 BATT pins；The VIN pins of the switching power source chip IC2 with Lithium battery is connected, and the EN pins of the switching power source chip IC2 pass through switching tube Q1 and the R_OUT pins of headset plug interface Electrical connection, the OUT pins of the switching power source chip IC2 are electrically connected with load circuit, the BP pipes of the switching power source chip IC2 Pin is grounded by electric capacity C1；The 2Y1 pins and 1Y0 pins of CTIA, OMTP automatic discrimination chip IC 3 respectively with headset plug The GND_MIC pins electrical connection of interface, the 2Y0 pins and 1Y1 pins of CTIA, OMTP automatic discrimination chip IC 3 respectively with The MIC_GND pins electrical connection of headset plug interface.

2. the power control circuit that utilization earphone interface according to claim 1 wakes up, it is characterised in that the resistance R1 Resistance be 330 Ω -1K Ω.