SFFS752 November   2023 DRV8242-Q1

PRODMIX  

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 HW Variant in VQFN-RHL Package
    2. 4.2 SPI "S" and"P" Variant in VQFN-RHL Package

4.1 HW Variant in VQFN-RHL Package

Figure 4-3 shows the pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the DRV8242-Q1 data sheet.

GUID-20220809-SS0I-GHLH-VF2J-JNNM4DLMS5MC-low.svg Figure 4-2 HW Variant
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin Description of Potential Failure Effect(s) Failure Effect Class
No. Name
1 SR Wrong SR configuration possible, EM performance may be affected. B
2 DIAG Wrong load and fault response configuration possible. B
3 IN2/PH Normal function as register bit is used for direction control. D
4 IN1/EN Load will be in re-circulation (braking). No risk of spin direction reversal. B
5 DRVOFF Pin based shutoff function is lost. B
6, 15 VM Device is powered off with driver Hi-Z. B
7, 8 OUT1 If OUT1 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
9-12 GND Normal function. D
13, 14 OUT2 If OUT2 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
16 nSLEEP Device will be in SLEEP state and outputs are Hi-Z. B
17 IPROPI IPROPI feedback is lost. ITRIP regulation, if enabled, is also lost. B
18 nFAULT False fault signalling possible. Device will continue to operate as commanded. B
19 MODE Wrong MODE configuration possible. B
20 ITRIP Incorrect ITRIP level for current regulation possible. B
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin Description of Potential Failure Effect(s) Failure Effect Class
No. Name
1 SR Wrong SR configuration possible, EM performance may be affected. B
2 DIAG Wrong load and fault response configuration possible. B
3 IN2/PH Normal function as register bit is used for direction control. D
4 IN1/EN Load will be in re-circulation (braking). No risk of spin direction reversal. B
5 DRVOFF Pin based shutoff is triggered and outputs are Hi-Z. B
6, 15 VM Device is powered off with driver Hi-Z. B
7, 8 OUT1 Load drive capability is lost. B
9-12 GND Device is powered off with driver Hi-Z. B
13, 14 OUT2 Load drive capability is lost. B
16 nSLEEP Device will be in SLEEP state and outputs are Hi-Z. B
17 IPROPI IPROPI feedback is lost. Load will be forced to recirculate if ITRIP regulation is enabled. B
18 nFAULT False fault signaling possible. Device will continue to operate as commanded. B
19 MODE Normal function. B
20 ITRIP Incorrect ITRIP level for current regulation possible. B
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Short between pins Description of Potential Failure Effect(s) Failure Effect Class
nFAULT MODE False fault signaling possible. MODE setting is not affected. 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
DIAG PH/IN2 Normal function as register bit is used for direction control. D
SR DIAG Wrong configuration - EM performance may be affected. Load and fault response may be incorrect. B
ITRIP SR Wrong configuration - EM performance may be affected. Incorrect ITRIP level for current regulation possible. B
MODE ITRIP Wrong configuration possible- Both MODE and ITRIP settings are affected. B
Table 4-5 Pin FMA for Device Pins Short-Circuited to VM
Pin Description of Potential Failure Effect(s) Failure Effect Class
No. Name
1 SR Device damage possible. A
2 DIAG Device damage possible. A
3 IN2/PH Device damage possible. A
4 IN1/EN Device damage possible. A
5 DRVOFF Outputs are Hi-Z. B
6, 15 VM Normal function. D
7, 8 OUT1 If OUT1 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
9-12 GND Device is powered off with driver Hi-Z. B
13, 14 OUT2 If OUT2 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
16 nSLEEP SLEEP functionality is lost. B
17 IPROPI Device damage possible. A
18 nFAULT Device damage possible. A
19 MODE Device damage possible. A
20 ITRIP Device damage possible. A