4 Pin Failure Mode Analysis (Pin FMA)

This section provides a failure mode analysis (FMA) for the pins of the DRV8262-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 DRV8262-Q1 pin diagram. For a detailed description of the device pins, see the Pin Configuration and Functions section in the DRV8262-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:

The device is used with external components consistent with the values described in the external component table of the data sheet.

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
VCP	1	Device charge pump non-operational	A
VM	2, 11, 12, 21	Device will not power up	B
PGND12 / PGND	3, 10	Intended Operation	D
OUT1	4, 5, 6	Device will signal OCP fault	B
OUT2	7, 8, 9	Device will signal OCP fault	B
PGND34 / PGND	13, 20	Intended Operation	D
OUT4 / OUT2	14, 15, 16	Device will signal OCP fault	B
OUT3 / OUT1	17, 18, 19	Device will signal OCP fault	B
GND	22, 23	Intended Operation	D
DVDD	24	Device digital supply stuck low. Device non-operational. Drivers disabled.	B
VCC	25	Device digital supply stuck low. Device non-operational. Drivers disabled.	B
nFAULT	26	Device will always be signaling fault	B
OCPM	27	Device only works with latch-off type recovery for OCP and OTSD	B
MODE1	28	Device only works in Dual H-bridge mode	B
MODE2	29	Device only works in PH/EN mode	B
IPROPI2 / IPROPI	30	Current sense output will not be available	B
IPROPI1 / IPROPI	31	Current sense output will not be available	B
RSVD	32, 36	No impact to functioality	D
VREF2 / VREF	33	Current regulation will be lost	B
VREF1 / VREF	34	Current regulation will be lost	B
TOFF	35	OFF time will be permanently set at 7 us	B
DECAY	37	Device will work only with slow decay	B
IN4	38	OUT4 will be stuck low	B
IN3	39	OUT3 will be stuck low	B
IN2	40	OUT2 will be stuck low	B
IN1	41	OUT1 will be stuck low	B
nSLEEP	42	Device will be in sleep state with OUTx Hi-Z	B
CPL	43	Device charge pump non-operational	B
CPH	44	Device charge pump non-operational	A

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

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
VCP	1	Device charge pump non-operational	B
VM	2, 11, 12, 21	Device will not power up	B
PGND12 / PGND	3, 10	Device will not power up	B
OUT1	4, 5, 6	Device will not be able to drive the load properly	B
OUT2	7, 8, 9	Device will not be able to drive the load properly	B
PGND34 / PGND	13, 20	Device will not power up	B
OUT4 / OUT2	14, 15, 16	Device will not be able to drive the load properly	B
OUT3 / OUT1	17, 18, 19	Device will not be able to drive the load properly	B
GND	22, 23	Device will not power up	B
DVDD	24	Device digital supply missing. Device non-operational.	B
VCC	25	Device digital supply missing. Device non-operational.	B
nFAULT	26	Fault signaling will be lost	B
OCPM	27	Device only works with latch-off type recovery for OCP and OTSD	B
MODE1	28	Device only works in dual H-bridge mode	B
MODE2	29	Device only works in PWM mode	B
IPROPI2 / IPROPI	30	Current sense output will not be available	B
IPROPI1 / IPROPI	31	Current sense output will not be available	B
RSVD	32, 36	No impact to functionality	D
VREF2 / VREF	33	Current regulation will be lost	B
VREF1 / VREF	34	Current regulation will be lost	B
TOFF	35	OFF time will be permanently set at 24us	B
DECAY	37	Device will work only with mixed decay	B
IN4	38	PWM functionality will not be available for OUT4	B
IN3	39	PWM functionality will not be available for OUT3	B
IN2	40	PWM functionality will not be available for OUT2	B
IN1	41	PWM functionality will not be available for OUT1	B
nSLEEP	42	Device will be in sleep state with OUTx Hi-Z	B
CP	43	Device charge pump non-operational	B
CPH	44	Device charge pump non-operational	B

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

Pin Name	Pin No.	Shorted to Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
VCP	1	2	Device charge pump non-operational	B
VM	2	3	Device will not power up	B
PGND12	3	4	Device will signal OCP fault	B
OUT1	4	5	Intended Operation	D
OUT1	5	6	Intended Operation	D
OUT1	6	7	Device will signal OCP fault	B
OUT2	7	8	Intended Operation	D
OUT2	8	9	Intended Operation	D
OUT2	9	10	Device will signal OCP fault	B
PGND12	10	11	Device will not power up	B
VM	11	12	Intended Operation	D
VM	12	13	Device will not power up	B
PGND34	13	14	Device will signal OCP fault	B
OUT4	14	15	Intended Operation	D
OUT4	15	16	Intended Operation	D
OUT4	16	17	Device will signal OCP fault	B
OUT3	17	18	Intended Operation	D
OUT3	18	19	Intended Operation	D
OUT3	19	20	Device will signal OCP fault	B
PGND34	20	21	Device will not power up	B
VM	21	22	Device will not power up	B
GND	22	23	Intended Operation	D
GND	23	24	Digital supply missing. Device non-operational.	B
DVDD	24	25	Digital supply missing. Device non-operational.	B
VCC	25	26	Device will reset whenever nFAULT is asserted low	B
nFAULT	26	27	OCP/OTSD recovery setting and fault signal will be lost	B
OCPM	27	28	OCP/OTSD recovery and MODE setting will be lost	B
MODE1	28	29	MODE setting will be lost	B
MODE2	29	30	MODE setting and current sense output function will be lost	B
IPROPI2	30	31	Current sense output functionality will be lost	B
IPROPI1	31	32	No impact to functionality	D
RSVD	32	33	No impact to functionality	D
VREF2	33	34	Independent current regulation will be non-functional	B
VREF1	34	35	Current regulation and off time setting will be non-functional	B
TOFF	35	36	No impact to functionality	D
RSVD	36	37	No impact to functionality	D
DECAY	37	38	Decay mode setting and input PWM function will be lost	B
IN4	38	39	Input PWM functionality will be lost	B
IN3	39	40	Input PWM functionality will be lost	B
IN2	40	41	Input PWM functionality will be lost	B
IN1	41	42	Input PWM and Sleep mode function will be lost	B
nSLEEP	42	43	Device charge pump non-operational	A
CPL	43	44	Device charge pump non-operational	B
CPH	44	1	Device charge pump non-operational	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
VCP	1	Device charge pump non-operational	B
VM	2, 11, 12, 21	Intended Operation	D
PGND12 / PGND	3, 10	Device will not power up	B
OUT1	4, 5, 6	Device will signal OCP fault	B
OUT2	7, 8, 9	Device will signal OCP fault	B
PGND34 / PGND	13, 20	Device will not power up	B
OUT4 / OUT2	14, 15, 16	Device will signal OCP fault	B
OUT3 / OUT1	17, 18, 19	Device will signal OCP fault	B
GND	22, 23	Device will not power up	B
DVDD	24	Low voltage pin maximum voltage violated	A
VCC	25	Low voltage pin maximum voltage violated	A
nFAULT	26	Low voltage pin maximum voltage violated	A
OCPM	27	Low voltage pin maximum voltage violated	A
MODE1	28	Low voltage pin maximum voltage violated	A
MODE2	29	Low voltage pin maximum voltage violated	A
IPROPI2 / IPROPI	30	Low voltage pin maximum voltage violated	A
IPROPI1 / IPROPI	31	Low voltage pin maximum voltage violated	A
RSVD	32, 36	Low voltage pin maximum voltage violated	A
VREF2 / VREF	33	Low voltage pin maximum voltage violated	A
VREF1 / VREF	34	Low voltage pin maximum voltage violated	A
TOFF	35	Low voltage pin maximum voltage violated	A
DECAY	37	Low voltage pin maximum voltage violated	A
IN4	38	Low voltage pin maximum voltage violated	A
IN3	39	Low voltage pin maximum voltage violated	A
IN2	40	Low voltage pin maximum voltage violated	A
IN1	41	Low voltage pin maximum voltage violated	A
nSLEEP	42	Driver control will be lost	B
CPL	43	Device charge pump non-operational	A
CPH	44	Device charge pump non-operational	B