SFFS137 April 2021 LDC3114-Q1

4 Pin Failure Mode Analysis (Pin FMA)

This section provides a Failure Mode Analysis (FMA) for the pins of the LDC3114-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 LDC3114-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the LDC3114-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 powered within published absolute maximum operating conditions.

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
COM	1	COM is grounded without a bypass capacitor. Will cause an error in sensor input and unpredictable LC sensor behavior	B
GND	2	Normal operation	D
LPWRB	3	Device stuck in Low Power Mode	B
VDD	4	Power supply shorted to ground	B
INTB	5	INTB is stuck low	B
IN3	6	No LC sensor input	B
IN2	7	No LC sensor input	B
IN1	8	No LC sensor input	B
IN0	9	No LC sensor input	B
GND	10	Normal operation	D
OUT3	11	May result in output status error	B
OUT2	12	May result in output status error	B
OUT1	13	May result in output status error	B
SDA	14	SDA will be stuck low. I²C read/write will be non-functional	B
OUT0	15	May result in output status error	B
SCL	16	SCL will be stuck low. I²C read/write will be non-functional	B

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

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
COM	1	No common return path for LC resonator sensors	B
GND	2	No power supply to device	B
LPWRB	3	Failure to set functional mode	B
VDD	4	No power supply to device	B
INTB	5	INTB does not assert for button presses or error conditions	B
IN3	6	No LC sensor input	B
IN2	7	No LC sensor input	B
IN1	8	No LC sensor input	B
IN0	9	No LC sensor input	B
GND	10	No power supply to device	B
OUT3	11	Output is not connected to a load. May result in output status error	B
OUT2	12	Output is not connected to a load. May result in output status error	B
OUT1	13	Output is not connected to a load. May result in output status error	B
SDA	14	I²C read/write will be non-functional	B
OUT0	15	Output is not connected to a load. May result in output status error.	B
SCL	16	I²C read/write will be non-functional	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
COM	1	GND	COM is grounded without a bypass capacitor. Will cause an error in sensor input and unpredictable LC sensor behavior	B
GND	2	LPWRB	Device stuck in Low Power Mode	B
LPWRB	3	VDD	Device stuck in Normal Power Mode	B
VDD	4	INTB	INTB stuck high; loss of INTB functionality	B
INTB	5	IN3	Loss of INTB functionality and error in sensor input	B
IN3	6	IN2	Error in LC sensor input	B
IN2	7	IN1	Error in LC sensor input	B
IN1	8	IN0	Error in LC sensor input	B
IN0	9	GND	No LC sensor input	B
GND	10	OUT3	May result in output status error	B
OUT3	11	OUT2	May result in output status error	B
OUT2	12	OUT1	May result in output status error	B
OUT1	13	SDA	May result in output status error	B
SDA	14	OUT0	I²C read/write will be non-functional	B
OUT0	15	SCL	May result in output status error and I²C read/write will be non-functional	B
SCL	16	COM	I²C read/write will be non-functional	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
COM	1	Will cause unpredictable LC sensor behavior	B
GND	2	Power supply shorted to ground	B
LPWRB	3	Device stuck in Normal Power Mode	B
VDD	4	Normal operation	D
INTB	5	Loss of INTB functionality	B
IN3	6	No LC sensor input	B
IN2	7	No LC sensor input	B
IN1	8	No LC sensor input	B
IN0	9	No LC sensor input	B
GND	10	Power supply shorted to ground	B
OUT3	11	Error in logic output	B
OUT2	12	Error in logic output	B
OUT1	13	Error in logic output	B
SDA	14	I²C read/write will be non-functional	B
OUT0	15	Error in logic output	B
SCL	16	I²C read/write will be non-functional	B