33937_09 Datasheet, PDF (40/48 Pages) Freescale Semiconductor, Inc – Three Phase Field Effect Transistor Pre-driver

FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
6. Return
PROTECTION AND DIAGNOSIS FEATURES
Table 19. 33937 Fault Protection
No.
Fault
Cause
Detection
33937 Protective Action
1
Phase Output
Wire harness shorted to ^{• Directly sensed by ADC as voltage}
Shorted to VSUP
(High Side FET
Shorted)
battery
Drain-to-Source short on the ^•
High Side FET
•
across R_SENSE
Over-current Comparator output
OC_OUT monitoring (Over-current
Error)
Low Side Phase Error
• All external FETs turned off
• Fault bit set in Status Register
• INT pin set high
• OC_OUT pin set high
• Direct PHASEx output monitoring
2
Phase Output
Shorted to
Ground (R_SENSE
Bypassed)
Wire harness shorted to
battery
• Desaturation Error
• High Side Phase Error
• Direct PHASEx output monitoring
• All external FETs turned off
• Fault bit set in Status Register
• INT pin set high
3
Low Side FET
Drain-to-Source short on the ^{• Directly sensed by the ADC as}
Shorted
Low Side FET
voltage across R_SENSE
• Over-current Comparator output
OC_OUT high (Over-current error)
• Desaturation Error
• High Side Phase Error
• All external FETs turned off
• Fault bit set in Status Register
• INT pin set high
• OC_OUT pin set high
• Direct PHASEx output monitoring
4
High Side FET
Module board assembly _{• Desaturation Error}
Opened
issue
• High Side Phase Error
• All external FETs turned off
• Fault bit set in Status Register
• INT pin set high
5
Low Side FET
Module board assembly ^{• Directly sensed by ADC as voltage • All external FETs turned off}
Opened
issue
across R_SENSE
• Fault bit set in Status Register
• Low Side Phase Error
• INT pin set high
6
Phase Output
Opened (No
Load)
Wire harness open
• Directly sensed by ADC as voltage
across R_SENSE
NOTE: Other protective actions should be taken at the system level by the controlling microcontroller or DSP. It is possible to disable all
automatic shutdowns except for VLS undervoltage. Even when masked, faults will be registered by the status registers.
33937
40
Analog Integrated Circuit Device Data
Freescale Semiconductor