SFFS028 June 2022 TMP112-Q1

4 Pin Failure Mode Analysis (Pin FMA)

This section provides a Failure Mode Analysis (FMA) for the pins of the TMP112-Q1. 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

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 TMP112-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the TMP112-Q1 data sheet.

Figure 4-1 Pin Diagram

Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:

Device is the only slave on the I2C bus
External pull-up resistor on SCL/SDA pins

Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
SCL	1	SCL stuck low. No I2C communication with device possible.	B
GND	2	No effect. Normal operation.	D
ALERT	3	ALERT stuck low. Non-functionable. False thermal limit will be triggered.	B
ADD0	4	Limited address selection. Communication could be corrupted.	B
V+	5	Device unpowered. Device not functional. Observe that the absolute maximum ratings for all pins of the device are met, otherwise device damage may be plausible.	A
SDA	6	SDA stuck low. No I2C communication with device possible.	B

Table 4-3 Pin FMA for Device Pins Open-Circuited

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
SCL	1	State of SCL undetermined. No I2C communication with device possible.	B
GND	2	Device functionality undetermined. Device may be unpowered or connect to ground internally through alternate pin ESD diode and power up.	B
ALERT	3	State of ALERT undetermined. False thermal limit can be triggered.	B
ADD0	4	Limited address selection. Communication could be corrupted.	B
V+	5	Device functionality undetermined. Device unpowered if all external analog and digital pins are held low. Device may power up through internal ESD diodes to V+ if voltages above the device's power-on reset threshold are present on any of the analog or digital pins.	B
SDA	6	State of SDA undetermined. No I2C communication with device possible.	B

Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin

Pin Name	Pin No.	Shorted to	Description of Potential Failure Effect(s)	Failure Effect Class
SCL	1	GND	SCL stuck low. No I2C communication with device possible.	B
GND	2	ALERT	If ALERT is low then normal operation. If ALERT is high then device functionality undetermined. Observe that the absolute maximum ratings for all pins of the device are met, otherwise device damage may be plausible.	A
ALERT	3	GND	ALERT stuck low. Non-functionable. False thermal limit will be triggered.	B
SDA	4	V+	SDA stuck high. No I2C communication with device possible.	B
V+	5	ADD0	If ADD0 is intended to be connected to V+ then normal operation. If ADD0 is connected to SDA or SCL then functionality is undetermined. If ADD0 is connected to GND then device unpowered. Device not functional. Observe that the absolute maximum ratings for all pins of the device are met, otherwise device damage may be plausible.	A
ADD0	6	V+	Limited address selection. Communication could be corrupted.	B

Table 4-5 Pin FMA for Device Pins Short-Circuited to supply

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
SCL	1	SCL stuck high. No I2C communication with device possible.	B
GND	2	Device functionality undetermined. Observe that the absolute maximum ratings for all pins of the device are met, otherwise device damage may be plausible.	A
ALERT	3	ALERT stuck high. Non-functionable. Thermal limit will not be triggered.	B
ADD0	4	Limited address selection. Communication could be corrupted.	B
V+	5	No effect. Normal operation.	D
SDA	6	SDA stuck high. No I2C communication with device possible.	B