SFFS013A December 2020 – July 2021 TPS37-Q1 , TPS38-Q1
This section provides a Failure Mode Analysis (FMA) for the pins of the TPS37-Q1 and TPS38-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 TPS37-Q1 and TPS38-Q1 pin diagram. For a detailed description of the device pins please refer to TPS37-Q1 or TPS38-Q1 in the Pin Configuration and Functions section of the 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 |
---|---|---|---|
VDD | 1 | VDD short to GND Fault | B |
SENSE1 | 2 | Functionality affected if intent is not to monitor GND | B |
SENSE2 | 3 | Functionality affected if intent is not to monitor GND | B |
RESET1_UVOD | 4 | If open drain option: Unreliable device operation if not shorted to VOH | B |
If push pull option: Not recommended condition | A | ||
RESET2_UVOD | 5 | Unreliable device operation if not shorted to VOH | B |
CTR1 / MR | 6 | Normal operation, RESET1_UVOD will be asserted. | D |
CTS1 | 7 | Normal operation, RESET1_UVOD will be asserted. | D |
CTS2 | 8 | Normal operation, RESET2_UVOD will be asserted. | D |
CTR2 / MR | 9 | Normal operation, RESET2_UVOD will be asserted. | D |
GND | 10 | Normal operation | D |
Central Pad | PAD | Normal operation, Pad is not internally connected | D |
PIN NAME | PIN NO. | DESCRIPTION OF POTENTIAL FAILURE EFFECT(S) | FAILURE EFFECT CLASS |
---|---|---|---|
VDD | 1 | Device Unpowered | B |
SENSE1 | 2 | For fixed voltage threshold option where the applied voltage to
SENSE1 is less than 2.7 V, SENSE1 pin will detect a short to GND. For 800 mV SENSE1 voltage option, the input state will be undetermined. | B |
SENSE2 | 3 | For fixed voltage threshold option where the applied voltage to
SENSE2 is less than 2.7 V, SENSE2 pin will detect a short to GND. For 800 mV SENSE2 voltage option, the input state will be undetermined. | B |
RESET1_UVOD | 4 | Unreliable RESET1_UVOD | B |
RESET2_UVOD | 5 | Unreliable RESET2_UVOD | B |
CTR1 / MR | 6 | Normal operation | D |
CTS1 | 7 | Normal operation | D |
CTS2 | 8 | Normal operation | D |
CTR2 / MR | 9 | Normal operation | D |
GND | 10 | Device Unpowered | B |
Central Pad | PAD | Normal operation, pad is not internally connected | D |
PIN NAME | PIN NO. | SHORTED TO | DESCRIPTION OF POTENTIAL FAILURE EFFECT(S) | FAILURE EFFECT CLASS |
---|---|---|---|---|
VDD | 1 | SENSE1 | Functionality affected if intent is not to monitor VDD | B |
SENSE1 | 2 | SENSE2 | Functionality affected if intent is not to monitor SENSE2 | B |
SENSE2 | 3 | RESET1_UVOD | Functionality affected if intent is not to monitor RESET1_UVOD | B |
RESET1_UVOD | 4 | RESET2_UVOD | If open drain option: Unreliable device operation if not shorted to VOH | B |
RESET1_UVOD | 4 | RESET2_UVOD | If push pull option: Not recommended condition | A |
CTR1 / MR | 6 | CTS1 | Unreliable timing | B |
CTS1 | 7 | CTS2 | Unreliable timing | B |
CTS2 | 8 | CTR2 / MR | Unreliable timing | B |
CTR2 / MR | 9 | GND | Normal operation, a reset event will be asserted. | D |
Central Pad | PAD | N/A | N/A | N/A |
PIN NAME | PIN NO. | DESCRIPTION OF POTENTIAL FAILURE EFFECT(S) | FAILURE EFFECT CLASS |
---|---|---|---|
VDD | 1 | Normal operation | D |
SENSE1 | 2 | Functionality affected if intent is not to monitor VDD | B |
SENSE2 | 3 | Functionality affected if intent is not to monitor VDD | B |
RESET1_UVOD | 4 | Open drain option: Pullup resistor required. Short directly to VDD will affect pullup voltage functionality | B |
Push pull option: Not recommended condition | A | ||
RESET2_UVOD | 5 | Pullup resistor required. Short directly to VDD will affect pullup voltage functionality | B |
CTR1 / MR | 6 | May damage device if VDD is greater than the pin's recommended operating condition | A |
CTS1 | 7 | May damage device if VDD is greater than the pin's recommended operating condition | A |
CTS2 | 8 | May damage device if VDD is greater than the pin's recommended operating condition | A |
CTR2 / MR | 9 | May damage device if VDD is greater than the pin's recommended operating condition | A |
GND | 10 | VDD short to GND Fault | B |
Central Pad | PAD | D |