Device for detecting driving capability of power management chip

Abstract

The utility model discloses a device for detecting the driving capability of a power management chip. The micro-control unit module is respectively connected with the driving signal voltage and current detection module and the alarm lamp and function button module; the driving signal voltage and current detection module is connected with an external power management chip; the alarm lamp and the function button module are used for controlling to input a detection state signal to the micro-control unit module, and then the micro-control unit module is used for controlling a driving signal, and the voltage and current detection module is used for driving detection of the power management chip. And the information is fed back and sent to the alarm lamp and function button module for display or alarm. According to the utility model, whether the output voltage and current of the power supply management chip are consistent with the numerical value range in the chip manual can be rapidly verified, and the problem of wrong hardware power supply design caused by the fact that the driving capability of the selected chip is not consistent with the chip manual is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile electronic circuits, in particular to a device for detecting the driving capability of a power management chip. Background Art

[0002] The power management chip manages and controls the power supply. Its main functions include: 1. Power management. The power management chip is primarily responsible for managing the power supply, ensuring the proper operation of the controller by outputting the required voltage and current through the circuit design. 2. Fault protection: The power management chip features multiple fault protection mechanisms that monitor and protect the controller's power supply, preventing issues such as overvoltage and overcurrent, ensuring device safety during use.

[0003] When designing a hardware controller, it's necessary to select the appropriate power management chip based on the power consumption of different peripherals. This selection is usually calculated based on the chip manual. However, this operation carries the risk of discrepancies between the manual information and the actual chip output, leading to hardware power design errors and, in turn, abnormal controller operation. Utility Model Content

[0004] In order to solve the problems existing in the background technology, the utility model provides a device for detecting the driving capability of a power management chip, which can test the power management chip before the early design, compare the measured driving capability data with the manual, and ensure the correctness of the chip.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] The utility model comprises three parts: a driving signal voltage and current detection module, an alarm light and function button module, and a micro-control unit module. The micro-control unit module is respectively connected to the driving signal voltage and current detection module and the alarm light and function button module; the driving signal voltage and current detection module is connected to an external power management chip; the alarm light and function button module controls the input of a detection status signal to the micro-control unit module, and then the micro-control unit module controls the driving signal voltage and current detection module to detect the driving of the power management chip, and sends the feedback to the alarm light and function button module for display or alarm.

[0007] The micro-control unit module includes a power supply chip U10 and a main chip MCU1 connected to each other. The power supply chip U10 is connected to the drive signal voltage and current detection module. The main chip MCU1 is connected to the drive signal voltage and current detection module, the alarm light and function button module.

[0008] In the micro-control unit module, the VSUP1 pin and VSUP2 pin of the power supply chip U10 are used to connect the connector U8 in the drive signal voltage and current detection module, the 5V-CAN pin of the power supply chip U10 is grounded via capacitor C6, the CANH pin and CANL pin of the power supply chip U10 are used to connect the connector U8 in the drive signal voltage and current detection module, the RST pin of the power supply chip U10 is connected to the power supply voltage via resistor R40, the VDD pin of the power supply chip U10 outputs the power supply voltage, and the TXD pin and RXD pin of the power supply chip U10 are respectively connected to the TXD pin and RXD pin of the main chip MCU1.

[0009] The driving signal voltage and current detection module includes a connector U8, a current detector U1, a transistor Q5 and a transistor Q6. The connector U8 is used to connect to the power management chip; the VBAT pin of the connector U8 is connected to the vehicle power supply VBAT, and is also connected to the VSUP1 pin and VSUP2 pin of the power supply chip U10 in the micro-control unit module, the GND pin is grounded, the CANH pin is connected to the CANH pin of the power supply chip U10 in the micro-control unit module, and the CANL pin is connected to the CANL pin of the power supply chip U10 in the micro-control unit module;

[0010] The TEST_SUP pin of the connector U8 is connected to the ground through the resistors R22 and R23 in turn. The PAD06 pin of the main chip MCU1 in the micro-control unit module is connected between the resistors R22 and R23 as the ADC_TEST_SUP port. The TEST_SUP pin of the connector U8 is connected to the non-inverting input of the current detector U1. At the same time, the TEST_SUP pin of the connector U8 is connected to one of the two ends of the sliding rheostat RV1 through the resistor R1. The sliding end of the sliding rheostat RV1 is connected to the collector of the transistor Q5. The The emitter is grounded, and the base of the transistor Q5 is connected to the PB1 pin of the main chip MCU1 in the micro-control unit module; the lead between the resistor R1 and the sliding rheostat RV1 is connected to the inverting input end of the current detector U1, and the inverting input end of the current detector U1 is connected to the collector of the transistor Q6 through the resistor R2, the emitter of the transistor Q6 is grounded, and the base of the transistor Q6 is connected to the PB2 pin of the main chip MCU1 in the micro-control unit module; the output end of the current detector U1 serves as the CS_ADC port and is connected to the PAD07 pin of the main chip MCU1 in the micro-control unit module.

[0011] The alarm light and function button module includes transistor Q7, transistor Q9, voltage button SW3, self-test button SW2, voltage alarm light DS3 and self-test alarm light DS2; one end of the voltage alarm light DS3 is connected to the collector of the transistor Q7, the other end of the voltage alarm light DS3 is connected to the power supply voltage, the emitter of the transistor Q7 is grounded, and the base is connected to the IOC4 pin of the main chip MCU1 in the micro-control unit module; one end of the self-test alarm light DS2 is connected to the collector of the transistor Q9, the other end of the self-test alarm light DS2 is connected to the power supply voltage, the emitter of the transistor Q9 is grounded, and the base is connected to the IOC6 pin of the main chip MCU1 in the micro-control unit module; one end of the voltage button SW3 is connected to the power supply voltage, and the other end is connected to the PP0 pin of the main chip MCU1 in the micro-control unit module, one end of the self-test button SW2 is connected to the power supply voltage, and the other end is connected to the IOC1 pin of the main chip MCU1 in the micro-control unit module.

[0012] The TEST_SUP pin of the connector U8 is connected to the voltage output terminal of the power management chip.

[0013] In the alarm light and function button module, the voltage button SW3 and the self-test button SW2 are both non-return switches.

[0014] Beneficial effects of the utility model:

[0015] The utility model device is connected to the voltage output pin of the external power management chip, and by adjusting the resistance of the sliding rheostat in the loop, when the driving voltage is lower than the specified range, the alarm light comes on. At this time, the current voltage value and loop current value can be read through the CAN network, and the voltage and current values can be compared with the current-limited voltage and current values in the manual of the selected chip, so that the output voltage and current of the power management chip can be quickly verified to see whether they are consistent with the numerical range in the chip manual, avoiding the problem of incorrect hardware power design caused by the driving capability of the selected chip not being consistent with the chip manual. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the circuit device of the utility model. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1As shown, the circuit device includes three parts: a driving signal voltage and current detection module 1, an alarm light and function button module 2, and a micro-control unit module 3. The micro-control unit module 3 is connected to the driving signal voltage and current detection module 1 and the alarm light and function button module 2 respectively; the driving signal voltage and current detection module 1 is connected to an external power management chip and is also connected to a computer; the alarm light and function button module 2 controls the input of a detection status signal to the micro-control unit module 3, and then the micro-control unit module 3 controls the driving signal voltage and current detection module 1 to detect the driving of the power management chip, and sends the feedback to the alarm light and function button module 2 for display or alarm.

[0019] The micro-control unit module 3 includes a power supply chip U10 and a main chip MCU1 connected to each other. The power supply chip U10 is connected to the drive signal voltage and current detection module 1, and the main chip MCU1 is connected to the drive signal voltage and current detection module 1, the alarm light and function button module 2.

[0020] In the micro-control unit module 3, the No. 1 VSUP1 pin and the No. 2 VSUP2 pin of the power supply chip U10 are used to connect the No. 2 VBAT pin of the connector U8 in the drive signal voltage and current detection module 1, the No. 6 5V-CAN pin of the power supply chip U10 is grounded via capacitor C6, the No. 7 CANH pin and the No. 8 CANL pin of the power supply chip U10 are used to connect the No. 4 CANH pin and the No. 5 CANL pin of the connector U8 in the drive signal voltage and current detection module 1, the No. 22 RST pin of the power supply chip U10 is connected to the 5V power supply voltage via resistor R40, the No. 28 VDD pin of the power supply chip U10 outputs the 5V power supply voltage, the No. 29 TXD pin and the No. 30 RXD pin of the power supply chip U10 are respectively connected to the No. 74 TXD pin and the No. 75 RXD pin of the main chip MCU1.

[0021] In addition, pins 77, 60, 59, 31, and 29 of the main chip MCU1 are connected to 5V, and pins 10, 28, 32, 33, 61, 62, 67, and 76 of the main chip MCU1 are grounded.

[0022] The driving signal voltage and current detection module 1 includes a connector U8, a current detector U1, a transistor Q5 and a transistor Q6. The connector U8 is used to connect to a power management chip and a computer.

[0023] Specifically, VBAT pin No. 2 of connector U8 is connected to the vehicle power supply VBAT, and is also connected to the VSUP1 pin and VSUP2 pin of the power supply chip U10 in the micro-control unit module 3. GND pin No. 3 is grounded, CANH pin No. 4 is connected to the CANH pin of the power supply chip U10 in the micro-control unit module 3, and CANL pin No. 5 is connected to the CANL pin of the power supply chip U10 in the micro-control unit module 3.

[0024] The No. 1 TEST_SUP pin of the connector U8 is grounded through the resistors R22 and R23 in sequence. The PAD06 pin of the main chip MCU1 in the micro-control unit module 3 is connected between the resistors R22 and R23 as the ADC_TEST_SUP port. The No. 1 TEST_SUP pin of the connector U8 is connected to the positive input end of the current detector U1. At the same time, the No. 1 TEST_SUP pin of the connector U8 is connected to one of the two ends of the sliding resistor RV1 through the resistor R1. The sliding end of the sliding resistor RV1 is connected to the collector of the No. 3 pin of the transistor Q5, the emitter of the No. 2 pin of the transistor Q5 is grounded, and the base of the No. 1 pin of the transistor Q5 is used as the NORMAL_TEST port and connected to the PB1 pin of the main chip MCU1 in the micro-control unit module 3.

[0025] The resistor R1 and the sliding rheostat RV1 are connected to the inverting input terminal of the current detector U1. The inverting input terminal of the current detector U1 is connected to the collector of pin 3 of the transistor Q6 through the resistor R2. The emitter of pin 2 of the transistor Q6 is grounded. The base of pin 1 of the transistor Q6 serves as the DIAG_TEST port and is connected to the PB2 pin of the main chip MCU1 in the micro-control unit module 3.

[0026] The positive and negative power supply terminals of the current detector U1 are connected to the 5V power supply voltage and the ground respectively, wherein the positive power supply terminal is also grounded via the capacitor C1. The output terminal of the current detector U1 serves as the CS_ADC port and is connected to the PAD07 pin No. 58 of the main chip MCU1 in the micro-control unit module 3.

[0027] The warning light and function button module 2 includes transistor Q7, transistor Q9, 5V voltage button SW3, self-test button SW2, 5V voltage warning light DS3 and self-test warning light DS2;

[0028] One end of the 5V voltage warning light DS3 is connected to the collector of pin 3 of transistor Q7, and the other end of the 5V voltage warning light DS3 is connected to the 5V power supply voltage. The emitter of pin 2 of transistor Q7 is grounded, and the base of pin 1 serves as the DRV_5V port and is connected to pin 11 IOC4 of the main chip MCU1 in the micro-control unit module 3;

[0029] One end of the self-test alarm light DS2 is connected to the collector of pin 3 of transistor Q9, and the other end of the self-test alarm light DS2 is connected to the 5V power supply voltage. The emitter of pin 2 of transistor Q9 is grounded, and the base of pin 1 is used as the DRV_CHEACK port and connected to pin 13 IOC6 of the main chip MCU1 in the micro-control unit module 3;

[0030] One end of the 5V voltage button SW3 is connected to the 5V power supply voltage, and the other end serves as the 5V_TEST port and is connected to the No. 4 PP0 pin of the main chip MCU1 in the micro-control unit module 3. One end of the self-test button SW2 is connected to the 5V power supply voltage, and the other end serves as the CHEACK port and is connected to the No. 6 IOC1 pin of the main chip MCU1 in the micro-control unit module 3.

[0031] In this implementation, transistors Q5, Q6, Q7, and Q9 are NPN transistors (model Q2N2222). The main chip MCU1 is model S9S12P128JOMQK. The power supply module U10 is model MCZ33904A5EK. The current sensing module U1 is model TPA2296. Resistor R2 has a resistance of 40Ω, and RV1 has a sliding resistance range of 0-100Ω. The current sampling resistor R1 has a resistance of 0.1Ω, the resistor R22 has a resistance of 30K, and the resistor R23 has a resistance of 10K.

[0032] The No. 1 TEST_SUP pin of connector U8 is connected to the voltage output terminal of the power management chip, and the CANH pin and CANL pin are connected to the display input terminal of the computer.

[0033] In the alarm light and function button module 2, the specific working mode of the 5V voltage alarm light DS3 is that when the voltage is normal, the 5V voltage alarm light DS3 is off; when the resistance value of the sliding rheostat RV1 is changed, the main chip MCU1 detects through the ADC_TEST_SUP port that the 5V voltage output by the power management chip drops by 10% of the original voltage, that is, to 4.5V, the 5V voltage alarm light DS3 lights up.

[0034] The specific working mode of the self-test warning light DS2 is that the light is on during the self-test process and turns off when the self-test is completed and the self-test is passed. If the self-test fails, the self-test warning light DS2 will remain on.

[0035] In the alarm light and function button module 2, the 5V voltage button SW3 and the self-test button SW2 are both non-return switches, that is, they are always on when pressed, and open when pressed again.

[0036] The 5V voltage button SW3 is the 5V selection channel. When pressed, the main chip MCU1 identifies the 5V voltage source output from the TEST_SUP pin of the power management chip through the connector U8 through the ADC_TEST_SUP port; the self-test button SW2 is the self-test selection channel. When pressed, the main chip MCU1 performs a power-on self-test action.

[0037] The working mode of the device of the utility model includes self-test mode and working mode:

[0038] The following describes the specific implementation of the external power management chip with an output voltage of 5V and a current limit of 200mA. The specific test steps are as follows:

[0039] Through connector U8, its own TEST_SUP pin is connected to the test voltage output by the power management chip. The on-board VBAT output voltage supplies power to the remaining circuit parts in the device. The No. 4 CANH pin and No. 5 CANL pin of connector U8 are connected to an external computer, and then displayed on the computer and the voltage and current values output by the power management chip are monitored in real time through the computer. one,

[0041] Press the self-test button SW2 and the 5V voltage button SW3, so that the self-test button SW2 and the 5V voltage button SW3 are short-circuited. At this time, the 5V_TEST pin 2 of the 5V voltage button SW3 is high, and the CHEACK pin 2 of the self-test button SW2 is high, so that the 5V power supply voltage is input to the PP0 pin 4 and the IOC1 pin 6 of the main chip MCU1 in the micro-control unit module 3, and the main chip MCU1 enters the self-test mode:

[0042] The No. 13 IOC6 pin of the main chip MCU1 outputs a high level to the transistor Q9, making the transistor Q9 conduct and the self-test alarm light DS2 light up; at the same time, the No. 18 PB2 pin of the main chip MCU1 serves as the DIAG_TEST port and outputs a high level to the transistor Q6, making the transistor Q6 conduct. At this time, the resistor R2 is grounded through the transistor Q6;

[0043] Then, the voltage value U1 outputted from the TEST_SUP pin 1 of the connector U8 is detected by the PAD06 pin 57 of the main chip MCU1:

[0044] U1=5V*(R23 / (R22+R23))=5V*(10K / (10K+30K))=1.25V

[0045] At this time, the current I flowing through the resistor R1 is:

[0046] I=5V / (R1+R2)=5V / (0.1Ω+40Ω)≈0.125A

[0047] At this time, the voltage drop U2 on the current detector U1 is:

[0048] U2=I*R1=0.125A*0.1Ω=0.0125V

[0049] In a specific implementation, the gain of the current detector U1 is 100, that is, the current is amplified 100 times.

[0050] The voltage U3 at the output of pin 6 of the current detector U1 is:

[0051] U3=U2*a=0.0125V*100=1.25V.

[0052] Where a represents the gain coefficient of the current detector U1;

[0053] Then, the following judgment is made based on the voltage U3 read by the main chip MCU1:

[0054] If the voltage U3 satisfies the voltage range A≤U3≤B, B=1.25V+b, A=1.25Vb, A and B respectively represent the lower limit and upper limit of the self-test passing voltage, b represents the allowable tolerance threshold of the self-test passing voltage, then it means that the self-test has passed; specifically, if the voltage range 1.24V≤U3≤1.26V is met, then the self-test has passed.

[0055] At this time, the main chip MCU1 outputs low potential through the 18th PB2 pin as the DIAG_TEST port and the 13th IOC6 pin as the DRV_CHEACK port, so that the transistor Q9 and the transistor Q6 are both disconnected, and the self-test alarm light DS2 goes out, and the self-test passes;

[0056] Otherwise, the self-test fails. That is, if voltage U3 does not satisfy the voltage range A≤U3≤B, the self-test fails. At this time, the main chip MCU1's PB2 pin (18), which serves as the DIAG_TEST port, and IOC6 pin (13), which serves as the DRV_CHEACK port, continuously output a high potential, causing transistors Q9 and Q6 to conduct, and the self-test warning light DS2 to remain on. two,

[0058] Press the self-test button SW2 again to open the circuit, that is, the 5V power supply voltage is not input to the No. 6 IOC1 pin of the main chip MCU1 in the micro-control unit module 3. At this time, keep the 5V voltage button SW3 short-circuited, so that the 5V power supply voltage is input to the No. 4 PP0 pin of the main chip MCU1 in the micro-control unit module 3;

[0059] The main chip MCU1 detects the voltage state of the self-test button SW2 changing from high to low through the CHEACK port, and then the PB1 pin of the main chip MCU1, which serves as the MORMAL_TEST port, outputs a high level to the transistor Q5, turning on the transistor Q5; at the same time, the PB2 pin of the main chip MCU1, which serves as the DIAG_TEST port, outputs a low level to the transistor Q6, turning off the transistor Q6.

[0060] At this time, the test circuit is the circuit R1 and the sliding rheostat RV1 connected in series to ground.

[0061] Next, adjust the sliding rheostat RV1 to gradually reduce the resistance from the maximum value of the full resistance range, and detect the voltage value of the No. 1 TEST_SUP pin of the connector U8 in real time through the No. 57 PAD06 pin of the main chip MCU1 to make a judgment;

[0062] When the 5V voltage output by the power management chip drops to 10% of the original voltage, that is, 4.5V, due to its insufficient driving capability, the main chip MCU1 outputs a high level to the transistor Q7 via the IOC4 pin of the DRV_5V port, causing the transistor Q7 to conduct. At this time, the 5V voltage warning light DS3 is grounded and lights up. At this time, the computer is connected via the CAN network to display the voltage at ADC_TEST_SUP and the current flowing through R1, and then make a judgment:

[0063] When the current flowing through R1 read by the computer is ≥200mA, the driving capability of the power management chip is consistent with the parameter range description in the property manual, and the test is passed, meeting the design requirements, and the power management chip cannot be used.

[0064] When the current flowing through R1 read by the computer is less than 200mA, the driving capability of the power management chip is inconsistent with the parameter range description in the property manual, the test fails, and the power management chip does not meet the design requirements.

[0065] Then the power management chip is replaced and connected to the external plug-in board with the next power management chip to test the driving capability of the next power management chip. This allows for rapid batch testing of power management chips.

Claims

1. A device for detecting the driving capability of a power management chip, characterized by: The invention comprises three parts: a driving signal voltage and current detection module (1), an alarm light and function button module (2), and a micro-control unit module (3). The micro-control unit module (3) is connected to the driving signal voltage and current detection module (1) and the alarm light and function button module (2) respectively; the driving signal voltage and current detection module (1) is connected to an external power management chip; the alarm light and function button module (2) controls the input of a detection state signal to the micro-control unit module (3), and then the micro-control unit module (3) controls the driving signal voltage and current detection module (1) to detect the driving of the power management chip, and feeds back the signal to the alarm light and function button module (2) for display or alarm.

2. The device for detecting the driving capability of a power management chip according to claim 1, wherein: The micro-control unit module (3) includes a power supply chip U10 and a main chip MCU1 that are connected to each other, the power supply chip U10 is connected to the drive signal voltage and current detection module (1), and the main chip MCU1 is connected to the drive signal voltage and current detection module (1) and the alarm light and function button module (2).

3. The device for detecting the driving capability of a power management chip according to claim 2, wherein: In the micro-control unit module (3), the VSUP1 pin and the VSUP2 pin of the power supply chip U10 are used to connect to the connector U8 in the drive signal voltage and current detection module (1), the 5V-CAN pin of the power supply chip U10 is grounded via the capacitor C6, the CANH pin and the CANL pin of the power supply chip U10 are used to connect to the connector U8 in the drive signal voltage and current detection module (1), the RST pin of the power supply chip U10 is connected to the power supply voltage via the resistor R40, the VDD pin of the power supply chip U10 outputs the power supply voltage, and the TXD pin and the RXD pin of the power supply chip U10 are respectively connected to the TXD pin and the RXD pin of the main chip MCU1.

4. The device for detecting the driving capability of a power management chip according to claim 3, wherein: The driving signal voltage and current detection module (1) includes a connector U8, a current detector U1, a transistor Q5 and a transistor Q6. The connector U8 is used to connect to a power management chip; the VBAT pin of the connector U8 is connected to the vehicle power supply VBAT, and is also connected to the VSUP1 pin and the VSUP2 pin of the power supply chip U10 in the micro-control unit module (3), the GND pin is grounded, the CANH pin is connected to the CANH pin of the power supply chip U10 in the micro-control unit module (3), and the CANL pin is connected to the CANL pin of the power supply chip U10 in the micro-control unit module (3).

5. The device for detecting the driving capability of a power management chip according to claim 4, characterized in that: The TEST_SUP pin of the connector U8 is connected to the ground via resistors R22 and R23 in sequence. The PAD06 pin of the main chip MCU1 in the micro-control unit module (3) is connected between the resistors R22 and R23 as the ADC_TEST_SUP port. The TEST_SUP pin of the connector U8 is connected to the positive phase input terminal of the current detector U1. At the same time, the TEST_SUP pin of the connector U8 is connected to one of the two ends of the sliding variable resistor RV1 via the resistor R1. The sliding end of the sliding variable resistor RV1 is connected to the collector of the transistor Q5, and the emitter of the transistor Q5 is connected to the collector of the transistor Q5. The base of the transistor Q5 is connected to the PB1 pin of the main chip MCU1 in the micro-control unit module (3); the resistor R1 and the sliding rheostat RV1 are connected to the inverting input end of the current detector U1, the inverting input end of the current detector U1 is connected to the collector of the transistor Q6 through the resistor R2, the emitter of the transistor Q6 is grounded, and the base of the transistor Q6 is connected to the PB2 pin of the main chip MCU1 in the micro-control unit module (3); the output end of the current detector U1 serves as the CS_ADC port and is connected to the PAD07 pin of the main chip MCU1 in the micro-control unit module (3).

6. The device for detecting the driving capability of a power management chip according to claim 1, characterized in that: The alarm light and function button module (2) comprises a transistor Q7, a transistor Q9, a voltage button SW3, a self-test button SW2, a voltage alarm light DS3 and a self-test alarm light DS2; one end of the voltage alarm light DS3 is connected to the collector of the transistor Q7, the other end of the voltage alarm light DS3 is connected to the power supply voltage, the emitter of the transistor Q7 is grounded, and the base is connected to the IOC4 pin of the main chip MCU1 in the micro-control unit module (3); one end of the self-test alarm light DS2 is connected to the collector of the transistor Q9, the other end of the self-test alarm light DS2 is connected to the power supply voltage, the emitter of the transistor Q9 is grounded, and the base is connected to the IOC6 pin of the main chip MCU1 in the micro-control unit module (3); one end of the voltage button SW3 is connected to the power supply voltage, and the other end is connected to the PP0 pin of the main chip MCU1 in the micro-control unit module (3); one end of the self-test button SW2 is connected to the power supply voltage, and the other end is connected to the IOC1 pin of the main chip MCU1 in the micro-control unit module (3).

7. The device for detecting the driving capability of a power management chip according to claim 1, wherein: The TEST_SUP pin of the connector U8 is connected to the voltage output terminal of the power management chip.

8. The device for detecting the driving capability of a power management chip according to claim 1, wherein: In the alarm light and function button module (2), the voltage button SW3 and the self-test button SW2 are both non-return switches.

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