SFFS057A March   2021  – December 2021 DRV8244-Q1

 

  1.   Trademarks
  2. 1Overview
  3. 2Functional Safety Failure In Time (FIT) Rates
  4. 3Failure Mode Distribution (FMD)
  5. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 SPI "S" and "P" variant in HVSSOP package
    2. 4.2 SPI "S" variant in VQFN-HR package
    3. 4.3 HW variant in HVSSOP package
    4. 4.4 HW variant in VQFN-HR package
  6. 5Revision History

4.2 SPI "S" variant in VQFN-HR package

Figure 4-3shows the pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the DRV8244-Q1 data sheet.

GUID-20200902-CA0I-9R2Q-JTW4-VJSHGSBJ9JK3-low.gif Figure 4-3 SPI "S" variant
Table 4-6 Pin FMA for Device Pins Short-Circuited to Ground
Pin Description of Potential Failure Effect(s) Failure Effect Class
No. Name
1 nFAULT False fault signalling possible. Device will continue to operate as commanded. B
2 IPROPI IPROPI feedback is lost. ITRIP regulation, if enabled, is also lost. B
3 nSLEEP Device will be in SLEEP state and outputs are Hi-Z. B
4 VM Device is powered off with driver Hi-Z. B
5, 6 OUT2 If OUT2 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
7 GND Normal function. D
8, 9 OUT1 If OUT1 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
10 DRVOFF Pin based shutoff function is lost. B
11 EN/IN1 Load will be in re-circulation (braking). No risk of spin direction reversal. B
12 PH/IN2 Normal function as register bit is used for direction control. D
13 nSCS SPI communication is lost. B
14 SCLK SPI communication is lost. B
15 SDI SPI communication is lost. B
16 SDO SPI communication is lost. B
Table 4-7 Pin FMA for Device Pins Open-Circuited
Pin Description of Potential Failure Effect(s) Failure Effect Class
No. Name
1 nFAULT False fault signaling possible. Device will continue to operate as commanded. B
2 IPROPI IPROPI feedback is lost. Load will be forced to recirculate if ITRIP regulation is enabled. B
3 nSLEEP Device will be in SLEEP state and outputs are Hi-Z. B
4 VM Device is powered off with driver Hi-Z. B
5, 6 OUT2 Load drive capability is lost. B
7 GND Device is powered off with driver Hi-Z. B
8, 9 OUT1 Load drive capability is lost. B
10 DRVOFF Pin based shutoff is triggered and outputs are Hi-Z. B
11 EN/IN1 Load will be in re-circulation (braking). No risk of spin direction reversal. B
12 PH/IN2 Normal function as register bit is used for direction control. D
13 nSCS SPI communication is lost. B
14 SCLK SPI communication is lost. B
15 SDI SPI communication is lost. B
16 SDO SPI communication is lost. B
Table 4-8 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Short between pins Description of Potential Failure Effect(s) Failure Effect Class
nFAULT SDO False fault signaling possible. SPI communication will be affected during fault assertion. B
IPROPI nFAULT False fault signaling possible. IPROPI feedback is inaccurate. ITRIP regulation levels, if enabled, will be lower. B
nSLEEP IPROPI IPROPI feedback is inaccurate. ITRIP regulation levels, if enabled, will be lower. B
VM nSLEEP SLEEP functionality is lost. B
OUT2 VM If OUT2 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
GND OUT2 If OUT2 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
OUT1 GND If OUT1 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
VM OUT1 If OUT1 is commanded to be pulled low, short is detected and outputs are Hi-Z B
DRVOFF VM Outputs are Hi-Z. B
EN/IN1 DRVOFF Outputs are either Hi-Z or load is in re-circulation state. B
PH/IN2 EN/IN1 External PWM control is lost. Internal ITRIP regulation is OK. No risk of spin direction reversal. D
nSCS PH/IN2 Normal function as register bit is used for direction control. D
SCLK nSCS SPI communication is lost. B
SDI SCLK SPI communication is lost. B
SDO SDI SPI communication is lost. B
Table 4-9 Pin FMA for Device Pins Short-Circuited to VM
Pin Description of Potential Failure Effect(s) Failure Effect Class
No. Name
1 nFAULT Device damage possible. A
2 IPROPI Device damage possible. A
3 nSLEEP SLEEP functionality is lost. B
4 VM Normal function. D
5, 6 OUT2 If OUT2 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
7 GND Device is powered off with driver Hi-Z. B
8, 9 OUT1 If OUT1 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
10 DRVOFF Outputs are Hi-Z. B
11 EN/IN1 Device damage possible. A
12 PH/IN2 Device damage possible. A
13 nSCS Device damage possible. A
14 SCLK Device damage possible. A
15 SDI Device damage possible. A
16 SDO Device damage possible. A