SLVAEY6 November 2020 TPS3813-Q1
This section provides a Failure Mode Analysis (FMA) for the pins of the TPS3813-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:
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.
Class | Failure Effects |
---|---|
A | Potential device damage that affects functionality |
B | No device damage, but loss of functionality |
C | No device damage, but performance degradation |
D | No device damage, no impact to functionality or performance |
Figure 4-1 shows the TPS3813-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the TPS3813-Q1 data sheet.
Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
WDI | 1 | No damage but will cause /RESET to | C |
GND | 2 | Normal operation | D |
WDT | 3 | Normal operation mode | D |
VDD | 4 | No damage to device, but undefined condition. /RESET tends to be low | C |
WDR | 5 | Normal operation mode | D |
/RESET | 6 | Normal operation; causes /RESET to be low | C |
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
WDI | 1 | No damage to device but will cause /RESET to time out | C |
GND | 2 | No damage to device, but undefined operating condition | C |
WDT | 3 | No damage to device, but it is an undefined operating condition | C |
VDD | 4 | No power to device | C |
WDR | 5 | No damage to device, but it is an undefined operating condition | C |
/RESET | 6 | Normal operation, causes reset to be low | C |
Pin Name | Pin No. | Shorted to | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|---|
WDI | 1 | WDR | No damage to device but will cause /RESET to oscillate | C |
GND | 2 | /RESET | Normal operation; causes /RESET to be low | C |
WDT | 3 | GND | Normal operation mode | D |
VDD | 4 | WDI | No damage to device but will cause /RESET to timeout | C |
WDR | 5 | WDT | Normal operation | D |
/RESET | 6 | VDD | No damage to device, but it is an undefined operating conditon; /RESET needs pullup resistor | C |
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
WDI | 1 | No damage to device, but will cause /RESET to time out | C |
GND | 2 | Normal operation. Internally pulled up to VDD, external short may cause excess current consumption | C |
WDT | 3 | Normal operation mode | D |
VDD | 4 | Normal operation | D |
WDR | 5 | Normal operation mode | D |
/RESET | 6 | No damage to device but is an undefined operating condition. Needs pullup | C |