MC33879/80 diagnose & fault report explain

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MC33879/80 diagnose & fault report explain

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MC33879/80 diagnose & fault report explain

1. Any of three kinds of fault trigger fault bit toggle to 1

OT: Temp>155℃

OC:short to battery/supply or over-current condition.

OL:open load when OUTPUT OFF

2. base on truth table below, user can recognize the fault type

 

Output OFF(0)

Output ON(1)

HS

Open load/ short to BAT(OC)

short to GND(OC)/OT

LS

Open load/ short to GND(OC)

short to BAT(OC)/OT

 

  1. Open load(OL) and Short circuit base on Vds><VoutFLT-TH

33879

SusanXue_0-1629874120139.png

 

33880

SusanXue_1-1629874120161.png

 

OL: Vds<VFLT-TH && Output OFF

Short to BAT: Vds > VFLT-TH && OC

Short to GND: Vds< VFLT-TH &&OC

 

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Last update:
‎08-24-2021 11:52 PM
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