SFFS321 December 2021 DRV8908-Q1
The failure mode distribution estimation for the DRV8908-Q1 in Table 3-1 comes from the combination of common failure modes listed in standards such as IEC 61508 and ISO 26262, the ratio of sub-circuit function size and complexity, and from best engineering judgment.
The failure modes listed in this section reflect random failure events and do not include failures resulting from misuse or overstress.
| Die Failure Modes | Failure Mode Distribution (%) |
|---|---|
| Output is stuck LOW when commanded OFF (GND short) | 11%(1) |
| Output is stuck HIGH when commanded OFF (VM short) | 11%(1) |
| Output is stuck OFF when commanded LOW (Open) | 14%(1) |
| Output is stuck OFF when commanded HIGH (Open) | 14%(1) |
| Output ON resistance too high when commanded LOW | 11%(1) |
| Output ON resistance too high when commanded HIGH | 11%(1) |
| Low side slew rate too fast or too slow (high-side recirculation) | 5%(1) |
| High side slew rate too fast or too slow (low-side recirculation) | 5%(1) |
| Dead-time is too short | 4%(1) |
| Incorrect SPI communication | 12% |
| Incorrect input interpretation (nSLEEP) | 1% |
| Incorrect nFAULT assertion | 1% |
DRV8908-Q1 was developed using a quality-managed development process, but was not developed in accordance with the IEC 61508 or ISO 26262 standards.