SFFS320 December   2021 DRV8910-Q1

 

  1.   Trademarks
  2. 1Overview
  3. 2Functional Safety Failure In Time (FIT) Rates
  4. 3Failure Mode Distribution (FMD)
  5. 4Pin Failure Mode Analysis (Pin FMA)

Pin Failure Mode Analysis (Pin FMA)

This section provides a failure mode analysis (FMA) for the pins of the DRV8910-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:

Table 4-2 through Table 4-5 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.

Table 4-1 TI Classification of Failure Effects
ClassFailure Effects
APotential device damage that affects functionality.
BNo device damage, but loss of functionality.
CNo device damage, but performance degradation.
DNo device damage, no impact to functionality or performance.

Figure 4-1 shows the DRV8910-Q1 pin diagram. For a detailed description of the device pins, see the Pin Configuration and Functions section in the DRV8910-Q1 data sheet.

Figure 4-1 Pin Diagram

Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:

  • The device is used with external components consistent with the values described in the external component table of the datasheet.
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin Name Pin No. Description of Potential Failure Effect(s) Failure Effect Class
GND 1, 13, 24 Normal function. D
OUT1 2 If OUT1 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
OUT5 3 If OUT5 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
OUT7 4 If OUT7 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
SDI 5 SPI communication is lost. B
VDD 6 Device will be in SLEEP state and outputs are Hi-Z. B
SDO 7 SPI communication is lost. B
nSLEEP 8 Device will be in SLEEP state and outputs are Hi-Z. B
OUT9 9 If OUT9 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
OUT6 10 If OUT6 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
OUT4 11 If OUT4 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
nFAULT 12 False fault signalling possible. Device will continue to operate as commanded. B
OUT3 14 If OUT3 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
OUT10 15 If OUT10 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
VM 16, 21 Device is powered off with driver Hi-Z. B
NC 17, 18 Unused pin D
nSCS 19 SPI communication is lost. B
SCLK 20 SPI communication is lost. B
OUT8 22 If OUT8 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
OUT2 23 If OUT2 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin Name Pin No. Description of Potential Failure Effect(s) Failure Effect Class
GND 1, 13, 24 Device is powered off with driver Hi-Z. B
OUT1 2 Load drive capability is lost. B
OUT5 3 Load drive capability is lost. B
OUT7 4 Load drive capability is lost. B
SDI 5 SPI communication is lost. B
VDD 6 Device will be in SLEEP state and outputs are Hi-Z. B
SDO 7 SPI communication is lost. B
nSLEEP 8 Device will be in SLEEP state and outputs are Hi-Z. B
OUT9 9 Load drive capability is lost. B
OUT6 10 Load drive capability is lost. B
OUT4 11 Load drive capability is lost. B
nFAULT 12 False fault signaling possible. Device will continue to operate as commanded. B
OUT3 14 Load drive capability is lost. B
OUT10 15 Load drive capability is lost. B
VM 16, 21 Device is powered off with driver Hi-Z. B
NC 17, 18 Unused pin D
nSCS 19 SPI communication is lost. B
SCLK 20 SPI communication is lost. B
OUT8 22 Load drive capability is lost. B
OUT2 23 Load drive capability is lost. B
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin Name Pin No. Shorted to Description of Potential Failure Effect(s) Failure Effect Class
GND 1 GND Normal function. D
OUT1 2 GND If OUT1 is commanded to be pulled high, short is detected and OUT1 is Hi-Z. B
OUT5 3 OUT1 Load drive capability is lost. B
OUT7 4 OUT5 Load drive capability is lost. B
SDI 5 OUT7 SPI communication is lost. Low voltage pin max voltage may be violated. A
VDD 6 SDI SPI communication is lost. B
SDO 7 VDD SPI communication is lost. B
nSLEEP 8 SDO SPI communication is lost. B
OUT9 9 nSLEEP Low voltage pin max voltage may be violated. A
OUT6 10 OUT9 Load drive capability is lost. B
OUT4 11 OUT6 Load drive capability is lost. B
nFAULT 12 OUT4 False fault signalling possible. Low voltage pin max voltage may be violated. A
GND 13 nFAULT False fault signalling possible. Device will continue to operate as commanded. B
OUT3 14 GND If OUT3 is commanded to be pulled high, short is detected and OUT3 is Hi-Z. B
OUT10 15 OUT3 Load drive capability is lost. B
VM 16 OUT10 If OUT10 is commanded to be pulled low, short is detected and OUT10 is Hi-Z. B
NC 17 VM Short to unused pin. D
NC 18 NC Short to unused pin. D
nSCS 19 NC Short to unused pin. D
SCLK 20 nSCS SPI communication is lost. B
VM 21 SCLK SPI communication is lost. Low voltage pin max voltage may be violated. A
OUT8 22 VM If OUT8 is commanded to be pulled low, short is detected and OUT8 is Hi-Z. B
OUT2 23 OUT8 Load drive capability is lost. B
GND 24 OUT2 If OUT2 is commanded to be pulled high, short is detected and OUT2 is Hi-Z. B
Table 4-5 Pin FMA for Device Pins Short-Circuited to VM
Pin Name Pin No. Description of Potential Failure Effect(s) Failure Effect Class
GND 1, 13, 24 Device is powered off with driver Hi-Z. B
OUT1 2 If OUT1 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
OUT5 3 If OUT5 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
OUT7 4 If OUT7 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
SDI 5 SPI communication is lost. Low voltage pin max voltage may be violated. A
VDD 6 Low voltage pin max voltage may be violated. A
SDO 7 SPI communication is lost. Low voltage pin max voltage may be violated. A
nSLEEP 8 Low voltage pin max voltage may be violated. A
OUT9 9 If OUT9 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
OUT6 10 If OUT6 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
OUT4 11 If OUT4 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
nFAULT 12 Low voltage pin max voltage may be violated. A
OUT3 14 If OUT3 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
OUT10 15 If OUT10 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
VM 16, 21 Normal function. D
NC 17, 18 Short to unused pin. D
nSCS 19 SPI communication is lost. Low voltage pin max voltage may be violated. A
SCLK 20 SPI communication is lost. Low voltage pin max voltage may be violated. A
OUT8 22 If OUT8 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
OUT2 23 If OUT2 is commanded to be pulled low, short is detected and outputs are Hi-Z. B