SBAA467 March   2022 ADS7038-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)

Failure Mode Distribution (FMD)

The failure mode distribution estimation for the ADS7038-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 Modes Failure Mode Distribution (%)
Incorrect channel selected 20
Channel-channel short 15
ADC output code bit error 10
ADC gain error out of specification 10
ADC offset error out of specification 10
Communication error 10
Digital window comparator output fails to trip or false trip 10
Incorrect GPIOx pin configuration 5
Incorrect AINx/GPIOx pin operation (input/output stuck-at, floating, or incorrect logic level) 5
Incorrect programmable averaging filter output 5