SFFS056A March   2021  – December 2021 DRV8243-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

4.3 HW variant in HVSSOP package

Figure 4-4 shows the pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the DRV8243-Q1 data sheet.

GUID-20200902-CA0I-9QH3-L5N1-KM2SSRJRLCXH-low.gif Figure 4-4 HW variant
Table 4-10 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 PH/IN2 Load will be in re-circulation (braking). No risk of spin direction reversal. B
4 EN/IN1 Load will be in re-circulation (braking). No risk of spin direction reversal. B
5 DRVOFF Shutoff function is lost. B
6, 7, 8, 21, 22, 23 VM Device is powered off with driver Hi-Z. B
9, 10, 11 OUT1 If OUT1 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
12, 13, 14, 15, 16, 17 GND Normal function. D
18, 19, 20 OUT2 If OUT2 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
24 nSLEEP Device will be in SLEEP state and outputs are Hi-Z. B
25 IPROPI IPROPI feedback is lost. ITRIP regulation, if enabled, is also lost. B
26 nFAULT False fault signalling possible. Device will continue to operate as commanded. B
27 MODE Wrong MODE configuration possible. B
28 ITRIP Incorrect ITRIP level for current regulation possible. B
Table 4-11 Pin FMA for Device Pins Open-Circuited
Pin Description of Potential Failure Effect(s) Failure Effect Class
No. Name
1 SR Wrong SR configuration, EM performance may be affected. B
2 DIAG Wrong load and fault response configuration possible. B
3 PH/IN2 Normal function as register bit is used for direction control. D
4 EN/IN1 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, 7, 8, 21, 22, 23 VM Device is powered off with driver Hi-Z. B
9, 10, 11 OUT1 Load drive capability is lost. B
12, 13, 14, 15, 16, 17 GND Device is powered off with driver Hi-Z. B
18, 19, 20 OUT2 Load drive capability is lost. B
24 nSLEEP Device will be in SLEEP state and outputs are Hi-Z. B
25 IPROPI IPROPI feedback is lost. Load will be forced to recirculte if ITRIP regulation is enabled. B
26 nFAULT False fault signalling. Device will continue to operate as commanded. B
27 MODE Normal function. D
28 ITRIP Incorrect ITRIP level for current regulation possible. B
Table 4-12 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Short between pins Description of Potential Failure Effect(s) Failure Effect Class
SR ITRIP Wrong configuration - EM performance may be affected. Incorrect ITRIP level for current regulation possible. B
DIAG SR Wrong configuration - EM performance may be affected. Load and fault response may be incorrect. B
PH/IN2 DIAG Normal function as register bit is used for direction control. D
EN/IN1 PH/IN2 External PWM control is lost. Internal ITRIP regulation is OK. No risk of spin direction reversal. D
DRVOFF EN/IN1 Outputs are either Hi-Z or load is in re-circulation state. B
VM DRVOFF Outputs are Hi-Z. B
OUT1 VM If OUT1 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
GND OUT1 If OUT1 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
OUT2 GND If OUT2 is commanded to be pulled high, short is detected and outputs are Hi-Z. B
VM OUT2 If OUT2 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
nSLEEP VM SLEEP functionality is lost. B
IPROPI nSLEEP IPROPI feedback is inaccurate. ITRIP regulation levels, if enabled, will be lower. B
nFAULT IPROPI False fault signaling possible. IPROPI feedback is inaccurate. ITRIP regulation levels, if enabled, will be lower. B
MODE nFAULT False fault signaling possible. MODE setting is not affected. B
ITRIP MODE Wrong configuration possible- Both MODE and ITRIP settings are affected. B
Table 4-13 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 PH/IN2 Device damage possible. A
4 EN/IN1 Device damage possible. A
5 DRVOFF Outputs are Hi-Z. B
6, 7, 8, 21, 22, 23 VM Normal function. D
9, 10, 11 OUT1 If OUT1 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
12, 13, 14, 15, 16, 17 GND Device is powered off with driver Hi-Z. B
18, 19, 20 OUT2 If OUT2 is commanded to be pulled low, short is detected and outputs are Hi-Z. B
24 nSLEEP SLEEP functionality is lost. B
25 IPROPI Device damage possible. A
26 nFAULT Device damage possible. A
27 MODE Device damage possible. A
28 ITRIP Device damage possible. A