SFFS167B september   2021  – july 2023 ADS117L11 , ADS127L11 , ADS127L21

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 TSSOP Package
    2. 2.2 WQFN Package
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 TSSOP Package
    2. 4.2 WQFN Package
  7. 5Revision History

3 Failure Mode Distribution (FMD)

The failure mode distribution estimation for the ADS117L11, ADS127L11 and ADS127L21 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 (%)
Analog input stuck at 20
Digital control pins stuck at 20
Output code bit stuck at 10
Communication error 10
10x input leakage current 10
10% shift of gain or offset 20
Oscillator frequency exceeds specification 5
VCM pin voltage exceeds specification 5