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
•
•
Directly sensed by ADC as voltage
across RSENSE
Over-current Comparator output
OC_OUT monitoring (Over-current
Error)
1
Phase Output
Shorted to VSUP battery
Wire harness shorted to
•
•
•
•
All external FETs turned off
Fault bit set in Status Register
INT pin set high
(High Side FET
Shorted)
Drain-to-Source short on the
High Side FET
OC_OUT pin set high
•
•
Low Side Phase Error
Direct PHASEx output monitoring
2
3
Phase Output
Shorted to
Ground (RSENSE
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
•
•
Directly sensed by the ADC as
voltage across RSENSE
Over-current Comparator output
OC_OUT high (Over-current error)
Desaturation Error
Low Side FET
Shorted
Drain-to-Source short on the
Low Side FET
•
•
•
•
All external FETs turned off
Fault bit set in Status Register
INT pin set high
•
•
•
OC_OUT pin set high
High Side Phase Error
Direct PHASEx output monitoring
•
•
•
All external FETs turned off
Fault bit set in Status Register
INT pin set high
4
5
6
High Side FET
Opened
Module board assembly
issue
•
•
Desaturation Error
High Side Phase Error
•
•
•
Directly sensed by ADC as voltage
across RSENSE
Low Side Phase Error
•
•
•
All external FETs turned off
Fault bit set in Status Register
INT pin set high
Low Side FET
Opened
Module board assembly
issue
Phase Output
Opened (No
Load)
Wire harness open
Directly sensed by ADC as voltage
across RSENSE
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
Analog Integrated Circuit Device Data
Freescale Semiconductor
40
FREESCALE [ Freescale ]
