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FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
PROTECTION AND DIAGNOSIS FEATURES
Table 18. 33927 Fault Protection
1
No.
Fault
Phase Output
Cause
Wire harness shorted to
Detection
? Directly sensed by ADC as
33927 Protective Action
Shorted to VBAT
(High-Side FET
Shorted)
battery
Drain-to-Source short on the
High-Side FET
voltage across R SENSE
? Overcurrent Comparator output
OC_OUT monitoring
(Overcurrent 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
? Overcurrent Comparator output
OC_OUT high (Overcurrent
error)
? 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
OC_OUT pin set high
4
5
High-Side FET
Opened
Low-Side FET
Opened
Module board assembly
issue
Module board assembly
issue
? Desaturation Error
? High-Side Phase Error
? Directly sensed by ADC as
voltage across R SENSE
? All external FETs turned off
? Fault bit set in Status Register
? INT pin set high
? All external FETs turned off
? 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.
33927
Analog Integrated Circuit Device Data
36
Freescale Semiconductor
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