SFFSA77 January   2025 DRV81008-Q1

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)
  7. 5Revision History

4 Pin Failure Mode Analysis (Pin FMA)

This section provides a failure mode analysis (FMA) for the pins of the DRV81008-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:

  • Pin short-circuited to ground (see Table 4-2)
  • Pin open-circuited (see Table 4-3)
  • Pin short-circuited to an adjacent pin (see Table 4-4)
  • Pin short-circuited to supply (see Table 4-5)

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
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 DRV81008-Q1 pin diagram. For a detailed description of the device pins, see the Pin Configuration and Functions section in the DRV81008-Q1 data sheet.

DRV81008-Q1 Pin Diagram Figure 4-1 Pin Diagram

Following is the assumption 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 data sheet.
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
nSCS 1 SPI communication is nonfunctional. B
SCLK 2 SPI communication is nonfunctional. B
SDI 3 SPI communication is nonfunctional. B
SDO 4 SPI communication is nonfunctional. B
GND 5 Intended operation. D
OUT0 6 Loss of load control. B
OUT2 7 Loss of load control. B
GND 8 Intended operation. D
OUT4 9 Loss of load control. B
NC 10 No impact to device functionality. D
NC 11 No impact to device functionality. D
OUT6 12 Loss of load control. B
OUT7 13 Loss of load control. B
NC 14 No impact to device functionality. D
NC 15 No impact to device functionality. D
OUT5 16 Loss of load control. B
GND 17 Intended operation. D
OUT3 18 Loss of load control. B
OUT1 19 Loss of load control. B
VM 20 VM undervoltage warning. B
nSLEEP 21 SPI communication is nonfunctional. B
IN1 22 Loss of load control. B
IN0 23 Loss of load control. B
VDD 24 SPI communication is nonfunctional. B
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
nSCS 1 SPI communication is nonfunctional. B
SCLK 2 SPI communication is nonfunctional. B
SDI 3 SPI communication is nonfunctional. B
SDO 4 SPI communication is nonfunctional. B
GND 5 Loss of load control. B
OUT0 6 False faults are potentially detected. B
OUT2 7 False faults are potentially detected. B
GND 8 Loss of load control. B
OUT4 9 False faults are potentially detected. B
NC 10 No impact to device functionality. D
NC 11 No impact to device functionality. D
OUT6 12 False faults are potentially detected. B
OUT7 13 False faults are potentially detected. B
NC 14 No impact to device functionality. D
NC 15 No impact to device functionality. D
OUT5 16 False faults are potentially detected. B
GND 17 Loss of load control. B
OUT3 18 False faults are potentially detected. B
OUT1 19 False faults are potentially detected. B
VM 20 VM undervoltage warning. B
nSLEEP 21 SPI communication is nonfunctional. B
IN1 22 Loss of load control. B
IN0 23 Loss of load control. B
VDD 24 SPI communication is nonfunctional. B
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin Name Pin No. Shorted to Pin No. Description of Potential Failure Effects Failure Effect Class
nSCS 1 2 SPI communication is nonfunctional. B
SCLK 2 3 SPI communication is nonfunctional. B
SDI 3 4 SPI communication is nonfunctional. B
SDO 4 5 SPI communication is nonfunctional. B
GND 5 6 Loss of load control. B
OUT0 6 7 Loss of load control, false faults are potentially detected. B
OUT2 7 8 Loss of load control. B
GND 8 9 Loss of load control. B
OUT4 9 10 False faults are potentially detected. B
NC 10 11 No impact to device functionality. D
NC 11 12 False faults are potentially detected. B
OUT6 12 13 Loss of load control, false faults are potentially detected. B
OUT7 13 14 False faults are potentially detected. B
NC 14 15 No impact to device functionality. D

NC

 15 16 False faults are potentially detected. B
OUT5 16 17 Loss of load control. B
GND 17 18 Loss of load control. B
OUT3 18 19 Loss of load control, false faults are potentially detected. B
OUT1 19 20 Loss of load control, false faults are potentially detected. B
VM 20 21 False faults are potentially detected. B
nSLEEP 21 22 Loss of load control. B
IN1 22 23 Loss of load control. B
IN0 23 24 Loss of load control. B
VDD 24 1 SPI communication is nonfunctional. B
Table 4-5 Pin FMA for Device Pins Short-Circuited to Supply
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
nSCS 1 Low voltage pin maximum voltage is violated. A
SCLK 2 Low voltage pin maximum voltage is violated. A
SDI 3 Low voltage pin maximum voltage is violated. A
SDO 4 Low voltage pin maximum voltage is violated. A
GND 5 VM undervoltage warning. B
OUT0 6 Loss of load control, false faults are potentially detected. B
OUT2 7 Loss of load control, false faults are potentially detected. B
GND 8 VM undervoltage warning. B
OUT4 9 Loss of load control, false faults are potentially detected. B
NC 10 No impact to device functionality. D
NC 11 No impact to device functionality. D
OUT6 12 Loss of load control, false faults are potentially detected B
OUT7 13 Loss of load control, false faults are potentially detected. B
NC 14 No impact to device functionality. D
NC 15 No impact to device functionality. D
OUT5 16 Loss of load control, false faults are potentially detected. B
GND 17 VM undervoltage warning. B
OUT3 18 Loss of load control, false faults are potentially detected. B
OUT1 19 Loss of load control, false faults are potentially detected. B
VM 20 Intended operation. D
nSLEEP 21 No impact to functionality. D
IN1 22 Low voltage pin maximum voltage is violated. A
IN0 23 Low voltage pin maximum voltage is violated. A
VDD 24 Low voltage pin maximum voltage is violated. A