SLVAEV7 September 2020 DRV8703-Q1
This section provides a Failure Mode Analysis (FMA) for the pins of the DRV8703-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:
These PIN FMA tables also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.
Class | Failure Effects |
---|---|
A | Potential device damage that affects functionality |
B | No device damage, but loss of functionality |
C | No device damage, but performance degradation |
D | No device damage, no impact to functionality or performance |
Figure 4-1 shows the DRV8703-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the DRV8703-Q1 data sheet.
Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
GND | 1 | Intended operation | D |
IN1/PH | 2 | Gate driver input control stuck low. Driver output may not match input. | B |
IN2/EN | 3 | Gate driver input control stuck low. Driver output may not match input. | B |
SDO | 4 | SPI communication compromised. | B |
nSCS | 5 | SPI communication compromised. | B |
SDI | 6 | SPI communication compromised. | B |
SCLK | 7 | SPI communication compromised. | B |
nSLEEP | 8 | Device stuck in sleep state. Outputs non-operational. | B |
nWDFLT | 9 | Watchdog fault indication always enabled. | B |
nFAULT | 10 | Device fault output indicator always active. | B |
MODE | 11 | Device MODE setting potentially incorrect. | B |
DVDD | 12 | Device external digital power supply stuck low. Device non-operational. | B |
GND | 13 | Intended operation | D |
AVDD | 14 | Device non-operational. Power dissipation through AVDD | B |
VREF | 15 | Current limit will trip every cycle | B |
SO | 16 | Device current sense feedback invalid. | B |
GND | 17 | Intended operation | D |
GH1 | 18 | HS1 MOSFET off, energy limited by TDRIVE. Device will report VGS fault | B |
SH1 | 19 | HS1 MOSFET non-functional. Device will report VDS fault | B |
GL1 | 20 | LS1 MOSFET off, energy limited by TDRIVE. Device will report VGS fault | B |
SP | 21 | Device current sense feedback invalid. | B |
SN | 22 | Device current sense feedback invalid. | B |
SL2 | 23 | Sense amplifier output is always low, no current regulation | B |
GL2 | 24 | LS2 MOSFET off, energy limited by TDRIVE. Device will report VGS fault | B |
SH2 | 25 | HS2 MOSFET non-functional. Device will report VDS fault | B |
GH2 | 26 | HS2 MOSFET off, energy limited by TDRIVE. Device will report VGS fault | B |
VDRAIN | 27 | Device overcurrent monitors and open load diagnostic non-operational. | B |
PVDD | 28 | Device external power supply stuck low. Device gate drivers and shunt amplifier non-operational. | B |
VCP | 29 | Device will be damaged | A |
CPH | 30 | Device will be damaged | A |
CPL | 31 | Device will report a charge pump fault | A |
NC | 32 | No effect | B |
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
GND | 1 | Device behavior undefined, may retain operation due to alternative GND pin. | C |
IN1/PH | 2 | Gate driver input control missing. Driver output may not match input. | B |
IN2/EN | 3 | Gate driver input control missing. Driver output may not match input. | B |
SDO | 4 | SPI communication compromised. | B |
nSCS | 5 | SPI communication compromised. | B |
SDI | 6 | SPI communication compromised. | B |
SCLK | 7 | SPI communication compromised. | B |
nSLEEP | 8 | Device stuck in sleep state. Outputs non-operational. | B |
nWDFLT | 9 | Device Watchdog fault output indicator invalid. | B |
nFAULT | 10 | Device fault output indicator invalid. | B |
MODE | 11 | Device MODE setting potentially incorrect. | B |
DVDD | 12 | Device external digital power supply missing. Device non-operational. | B |
GND | 13 | Device behavior undefined, may retain operation due to alternative GND pin. | C |
AVDD | 14 | Device behavior undefined, regulator may not be stable. | B |
VREF | 15 | Current limit will be unstable | B |
SO | 16 | Device current sense feedback invalid. | B |
GND | 17 | Device behavior undefined, may retain operation due to alternative GND pin. | C |
GH1 | 18 | HS1 MOSFET off | B |
SH1 | 19 | HS1 MOSFET non-functional, Device will report VDS fault | B |
GL1 | 20 | LS1 MOSFET off | B |
SP | 21 | Device current sense feedback invalid. | B |
SN | 22 | Device current sense feedback invalid. | B |
SL2 | 23 | Device will report a VDS fault | B |
GL2 | 24 | LS2 MOSFET off | B |
SH2 | 25 | HS2 MOSFET non-functional, Device will report VDS fault | B |
GH2 | 26 | HS2 MOSFET off | B |
VDRAIN | 27 | Device overcurrent monitors and open load diagnostic non-operational. | B |
PVDD | 28 | Device external power supply missing. Device gate drivers and shunt amplifier non-operational. | B |
VCP | 29 | Charge pump undervoltage and gate drivers disabled. | B |
CPH | 30 | Charge pump undervoltage and gate drivers disabled. | B |
CPL | 31 | Charge pump undervoltage and gate drivers disabled. | B |
NC | 32 | Intended operation | B |
Pin Name | Pin No. | Shorted to | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|---|
GND | 1 | 2 | Logic operation is changed. Driver output may not match input. | B |
IN1/PH | 2 | 3 | Logic operation is changed. Driver output may not match input. | B |
IN2/EN | 3 | 4 | Logic operation is changed. Driver output may not match input. | B |
SDO | 4 | 5 | SPI communication compromised. | B |
nSCS | 5 | 6 | SPI communication compromised. | B |
SDI | 6 | 7 | SPI communication compromised. | B |
SCLK | 7 | 8 | Device stuck in sleep state. Outputs non-operational. | B |
nSLEEP | 8 | 9 | Watchdog and fault output indicator function compromised. | B |
nWDFLT | 9 | 10 | Device fault output indicator always active. | B |
nFAULT | 10 | 11 | MODE will change to PH/EN whenever a FAULT occurs and nSLEEP toggled | B |
MODE | 11 | 12 | Device MODE setting potentially incorrect. | B |
DVDD | 12 | 13 | Device external digital power supply missing. Device non-operational. | B |
GND | 13 | 14 | Device non-operational. Power dissipation through AVDD | B |
AVDD | 14 | 15 | Current regulation disabled | B |
VREF | 15 | 16 | Device current sense feedback invalid. | B |
SO | 16 | 17 | Device current sense feedback invalid. | B |
GND | 17 | 18 | HS1 MOSFET off, energy limited by TDRIVE. Device will report VGS fault | B |
GH1 | 18 | 19 | HS1 MOSFET off, energy limited by TDRIVE. Device will report VGS fault | B |
SH1 | 19 | 20 | GL1 output invalid, may violate GL1 abs max. | A |
GL1 | 20 | 21 | LS1 MOSFET off, energy limited by TDRIVE. Device will report VGS fault | B |
SP | 21 | 22 | Device current sense feedback invalid. | B |
SN | 22 | 23 | Device current sense feedback invalid. | B |
SL2 | 23 | 24 | LS2 MOSFET off, energy limited by TDRIVE. Device will report VGS fault | B |
GL2 | 24 | 25 | GL2 output invalid, may violate GL2 abs max. | A |
SH2 | 25 | 26 | HS2 MOSFET off, energy limited by TDRIVE. Device will report VGS fault | B |
GH2 | 26 | 27 | HS2 MOSFET off, energy limited by TDRIVE. Device will report VGS fault | B |
VDRAIN | 27 | 28 | Hard short instead of a kelvin connection may degrate VDS accuracy | B |
PVDD | 28 | 29 | Device will report a charge pump fault | A |
VCP | 29 | 30 | Device will not power up | A |
CPH | 30 | 31 | Device will report a charge pump fault | A |
CPL | 31 | 32 | No effect | B |
NC | 32 | 1 | No effect | B |