SFFS115 Functional safety information

SFFS115 March 2021 DRV8889-Q1

4.2 QFN Package

Figure 4-2 shows the QFN package pin diagram. For a detailed description of the device pins please refer to the 'Pin Configuration and Functions' section in the respective datasheets.

Figure 4-2 QFN 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 datasheet.

Table 4-6 QFN Package - Pin FMA for Device Pins Short-Circuited to Ground

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
VM	1	Device will not power up	B
PGND	2	Intended Operation	D
AOUT1	3	Device will signal OCP fault	B
AOUT2	4	Device will signal OCP fault	B
BOUT2	5	Device will signal OCP fault	B
BOUT1	6	Device will signal OCP fault	B
PGND	7	Intended Operation	D
VM	8	Device will signal OCP fault	B
GND	9	Intended Operation	D
DVDD	10	Device external digital power supply stuck low. Device non-operational.	B
nFAULT	11	Device will always be signaling fault	B
VREF	12	Current regulation will be lost	B
nSCS	13	SPI read write functions will be non-functional	B
VSDO	14	SPI read function will be non-functional	B
SDO	15	SPI read function will be non-functional	B
SDI	16	SPI read write functions will be non-functional	B
SCLK	17	SPI read write functions will be non-functional	B
STEP	18	STEP input capability will be lost	B
DIR	19	Direction change capability will be lost	B
DRVOFF	20	Driver control will be lost	B
nSLEEP	21	Device will be in sleep state with OUTx Hi-Z	B
CPL	22	Device charge pump non-operational. Device CPUV fault.	A
CPH	23	Device charge pump non-operational. Device CPUV fault.	A
VCP	24	Device charge pump non-operational. Device CPUV fault.	A

Table 4-7 QFN Package - Pin FMA for Device Pins Open-Circuited

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
VM	1	Device will not power up	B
PGND	2	Device will not power up	B
AOUT1	3	Device will not be able to drive the load properly	B
AOUT2	4	Device will not be able to drive the load properly	B
BOUT2	5	Device will not be able to drive the load properly	B
BOUT1	6	Device will not be able to drive the load properly	B
PGND	7	Device will not power up	B
VM	8	Device will not power up	B
GND	9	Device will not power up	B
DVDD	10	Device external digital power supply missing. Device non-operational.	B
nFAULT	11	Fault signaling will be lost	B
VREF	12	Current regulation will be lost	B
nSCS	13	SPI read write functions will be non-functional	B
VSDO	14	SPI read function will be non-functional	B
SDO	15	SPI read function will be non-functional	B
SDI	16	SPI read write functions will be non-functional	B
SCLK	17	SPI read write functions will be non-functional	B
STEP	18	Driver control will be lost	B
DIR	19	Driver control will be lost	B
DRVOFF	20	Driver control will be lost	B
nSLEEP	21	Device will be in sleep state	B
CPL	22	Device charge pump non-operational. Device CPUV fault.	B
CPH	23	Device charge pump non-operational. Device CPUV fault.	B
VCP	24	Device charge pump non-operational. Device CPUV fault.	B

Table 4-8 QFN Package - Pin FMA for Device Pins Shorted to Adjacent Pin

Pin Name	Pin No.	Shorted to Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
VM	1	2	Device will not power up	B
PGND	2	3	Device will signal OCP fault	B
AOUT1	3	4	Device will signal OCP fault	B
AOUT2	4	5	Device will signal OCP fault	B
BOUT2	5	6	Device will signal OCP fault	B
BOUT1	6	7	Device will signal OCP fault	B
PGND	7	8	Device will not power up	B
VM	8	9	Device will not power up	B
GND	9	10	Device external digital power supply stuck low. Device non-operational.	B
DVDD	10	11	Device will reset whenever nFAULT is asserted low	B
nFAULT	11	12	Current regulation and fault signalling will be lost	B
VREF	12	13	Current regulation and SPI read write functions will be non-functional	B
nSCS	13	14	SPI read write functions will be non-functional	B
VSDO	14	15	SPI read write functions will be non-functional	B
SDO	15	16	SPI read write functions will be non-functional	B
SDI	16	17	SPI read write functions will be non-functional	B
SCLK	17	18	SPI read write functions and GPIO step input will be non-functional	B
STEP	18	19	STEP input and direction change capabilities will be lost	B
DIR	19	20	Direction change and OUTx control will be lost	B
DRVOFF	20	21	Driver control will be lost	B
nSLEEP	21	22	Device charge pump non-operational. Device CPUV fault.	A
CPL	22	23	Device charge pump non-operational. Device CPUV fault.	A
CPH	23	24	Device charge pump non-operational. Device CPUV fault.	A
VCP	24	1	Device charge pump non-operational. Device CPUV fault.	B

Table 4-9 QFN Package - Pin FMA for Device Pins Shorted to VM (High Voltage Supply)

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
VM	1	Intended Operation	D
PGND	2	Device will not power up	B
AOUT1	3	Device will signal OCP fault	B
'AOUT2	4	Device will signal OCP fault	B
BOUT2	5	Device will signal OCP fault	B
BOUT1	6	Device will signal OCP fault	B
PGND	7	Device will not power up	B
VM	8	Intended Operation	D
GND	9	Device will not power up	B
DVDD	10	Low voltage pin max voltage violated.	A
nFAULT	11	Low voltage pin max voltage violated.	A
VREF	12	Low voltage pin max voltage violated.	A
nSCS	13	Low voltage pin max voltage violated.	A
VSDO	14	Low voltage pin max voltage violated.	A
SDO	15	Low voltage pin max voltage violated.	A
SDI	16	Low voltage pin max voltage violated.	A
SCLK	17	Low voltage pin max voltage violated.	A
STEP	18	Low voltage pin max voltage violated.	A
DIR	19	Low voltage pin max voltage violated.	A
DRVOFF	20	Low voltage pin max voltage violated.	A
nSLEEP	21	Driver control will be lost	B
CPL	22	Device charge pump non-operational. Device CPUV fault.	A
CPH	23	Device charge pump non-operational. Device CPUV fault.	A
VCP	24	Device charge pump non-operational. Device CPUV fault.	B