SFFS115 Functional safety information

SFFS115 March 2021 DRV8889-Q1

4.1 HTSSOP Package

Figure 4-1 shows the HTSSOP 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 4-1 HTSSOP 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 4-2 HTSSOP Package - Pin FMA for Device Pins Short-Circuited to Ground

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

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

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

Table 4-4 HTSSOP 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
CPL	1	2	Device charge pump non-operational. Device CPUV fault.	A
CPH	2	3	Device charge pump non-operational. Device CPUV fault.	A
VCP	3	4	Device charge pump non-operational. Device CPUV fault.	B
VM	4	5	Device will not power up	B
PGND	5	6	Device will signal OCP fault	B
AOUT1	6	7	Device will signal OCP fault	B
AOUT2	7	8	Device will signal OCP fault	B
BOUT2	8	9	Device will signal OCP fault	B
BOUT1	9	10	Device will signal OCP fault	B
PGND	10	11	Device will not power up	B
VM	11	12	Device will not power up	B
GND	12	13	Device external digital power supply stuck low. Device non-operational.	B
DVDD	13	14	Device will reset whenever nFAULT is asserted low	B
nFAULT	14	15	Current regulation and fault signalling will be lost	B
VREF	15	16	Current regulation and SPI read write functions will be non-functional	B
nSCS	16	17	SPI read write functions will be non-functional	B
VSDO	17	18	SPI read write functions will be non-functional	B
SDO	18	19	SPI read write functions will be non-functional	B
SDI	19	20	SPI read write functions will be non-functional	B
SCLK	20	21	SPI read write functions and GPIO step input will be non-functional	B
STEP	21	22	STEP input and direction change capabilities will be lost	B
DIR	22	23	Direction change and OUTx control capabilities will be lost	B
DRVOFF	23	24	Driver control will be lost	B

Table 4-5 HTSSOP 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
CPL	1	Device charge pump non-operational. Device CPUV fault.	A
CPH	2	Device charge pump non-operational. Device CPUV fault.	A
VCP	3	Device charge pump non-operational. Device CPUV fault.	B
VM	4	Intended Operation	D
PGND	5	Device will not power up	B
AOUT1	6	Device will signal OCP fault	B
'AOUT2	7	Device will signal OCP fault	B
BOUT2	8	Device will signal OCP fault	B
BOUT1	9	Device will signal OCP fault	B
PGND	10	Device will not power up	B
VM	11	Intended Operation	D
GND	12	Device will not power up	B
DVDD	13	Low voltage pin max voltage violated.	A
nFAULT	14	Low voltage pin max voltage violated.	A
VREF	15	Low voltage pin max voltage violated.	A
nSCS	16	Low voltage pin max voltage violated.	A
VSDO	17	Low voltage pin max voltage violated.	A
SDO	18	Low voltage pin max voltage violated.	A
SDI	19	Low voltage pin max voltage violated.	A
SCLK	20	Low voltage pin max voltage violated.	A
STEP	21	Low voltage pin max voltage violated.	A
DIR	22	Low voltage pin max voltage violated.	A
DRVOFF	23	Low voltage pin max voltage violated.	A
nSLEEP	24	Driver control will be lost	B