SFFSA76 January 2025 DRV81004-Q1
4 Pin Failure Mode Analysis (Pin FMA)
This section provides a failure mode analysis (FMA) for the pins of the DRV81004-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 DRV81004-Q1 pin diagram. For a detailed description of the device pins, see the Pin Configuration and Functions section in the DRV81004-Q1 data sheet.
Figure 4-1 Pin DiagramFollowing 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 |
| OUT3 | 8 | Loss of load control. | B |
| OUT1 | 9 | Loss of load control. | B |
| VM | 10 | VM undervoltage warning. | B |
| nSLEEP | 11 | SPI communication is nonfunctional. | B |
| IN1 | 12 | Loss of load control. | B |
| IN0 | 13 | Loss of load control. | B |
| VDD | 14 | 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 |
| OUT3 | 8 | False faults are potentially detected | B |
| OUT1 | 9 | False faults are potentially detected | B |
| VM | 10 | VM undervoltage warning. | B |
| nSLEEP | 11 | SPI communication is nonfunctional. | B |
| IN1 | 12 | Loss of load control. | B |
| IN0 | 13 | Loss of load control. | B |
| VDD | 14 | 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, false faults are potentially detected. | B |
| OUT3 | 8 | 9 | Loss of load control, false faults are potentially detected. | B |
| OUT1 | 9 | 10 | Loss of load control, false faults are potentially detected. | B |
| VM | 10 | 11 | False faults are potentially detected. | B |
| nSLEEP | 11 | 12 | Loss of load control. | B |
| IN1 | 12 | 13 | Loss of load control. | B |
| IN0 | 13 | 14 | Loss of load control. | B |
| VDD | 14 | 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 |
| OUT3 | 8 | Loss of load control, false faults are potentially detected. | B |
| OUT1 | 9 | Loss of load control, false faults are potentially detected. | B |
| VM | 10 | Intended operation. | D |
| nSLEEP | 11 | No impact to functionality. | D |
| IN1 | 12 | Low voltage pin maximum voltage is violated. | A |
| IN0 | 13 | Low voltage pin maximum voltage is violated. | A |
| VDD | 14 | Low voltage pin maximum voltage is violated. | A |