SFFS317A December   2021  – April 2022 BQ77207

 

  1.   Trademarks
  2. 1Overview
  3. 2Functional Safety Failure In Time (FIT) Rates
  4. 3Failure Mode Distribution (FMD)
  5. 4Pin Failure Mode Analysis (Pin FMA)
  6. 5Revision History

Pin Failure Mode Analysis (Pin FMA)

This section provides a Failure Mode Analysis (FMA) for the pins of the BQ77207. 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
ClassFailure Effects
APotential device damage that affects functionality
BNo device damage, but loss of functionality
CNo device damage, but performance degradation
DNo device damage, no impact to functionality or performance

Figure 4-1 shows the BQ77207 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the BQ77207 data sheet.

GUID-20210309-CA0I-MHKN-V20J-040ZQKCZDQHV-low.gifFigure 4-1 Pin Diagram
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
VDD1No power to partB
V72Automatic OV detection.D
V63Automatic OV detection.D
V54Automatic OV detection.D
V45Automatic OV detection.D
V36Automatic OV detection.D
V27Automatic OV detection.D
V18Automatic OV detection.D
VSS9Function as normalD
COUT10No output signal to systemB
DOUT11No output signal to systemB
TS12Automatic OT detection.D
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
VDD1No power to partB
V72Automatic OW detection.D
V63Automatic OW detection.D
V54Automatic OW detection.D
V45Automatic OW detection.D
V36Automatic OW detection.D
V27Automatic OW detection.D
V18Automatic OW detection.D
VSS9No power to partB
COUT10No output signal to systemB
DOUT11No output signal to systemB
TS12No OT detection.B
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin NamePin No.Shorted toDescription of Potential Failure Effect(s)Failure Effect Class
VDD1V7Function as normalC
V72VDDFunction as normalC
V63V7Automatic OV detection.D
V54V6Automatic OV detection.D
V45NCFunction as normalD
V36V4Automatic OV detectionD
V27V3Automatic OV detection.D
V18V2Automatic OV detection.D
VSS9V1Automatic OV detection.D
COUT10VSSNo output signal to systemB
DOUT11COUTNo output signal to systemB
TS12DOUTAutomatic OT detection.D
Table 4-5 Pin FMA for Device Pins Short-Circuited to Supply
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
VDD1Function as normalC
V72AFunction as normalC
V63Automatic OV detection.D
V54Automatic OV detection.D
V45Automatic OV detection.D
V36Automatic OV detection.D
V27Automatic OV detection.D
V18Automatic OV detection.D
VSS9Automatic OW detection.D
COUT10No output signal to systemB
DOUT11No output signal to systemB
TS12No OT detection.A