SFFS539 January   2023 AMC6821-Q1

 

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

3 Failure Mode Distribution (FMD)

The failure mode distribution estimation for the AMC6821-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.

Table 3-1 Die Failure Modes and Distribution
Die Failure ModesFailure Mode Distribution (%)
Serial communication error15

ADC out of specification

25
Register bank data bit error15

PWM output error

15

TACH count error

15

THERM false trip, fails to trip

5

OVR false trip, fails to trip

5

FAN-FAULT false trip, fails to trip

5