L9663 datasheet(44/106 Pages) STMICROELECTRONICS

44 / 106 page

Diagnosis

L9663

44/106

DS11401 Rev 6

4.4

PSIx reverse voltage monitoring

The PSIx sensor supply lines are monitored to detect a short circuit to battery if the PSIx line

is switched on.

Basic features:



Reverse voltage monitoring with respect to VAS (or VBH during sync pulse) voltage

with filter time



Readable via SPI

Figure 23. Timing for PSIx reverse voltage detection

In case of a detected failure, a failure bit STBx in SR2 register is set to '1' (latched and

cleared upon reading via SPI).

After reset, the failure bit is reset to '0'

4.5

VAS under/over voltage monitoring

The VAS voltage is monitored for under voltage and over voltage.

Basic features:



Under voltage comparator with filter time



Over voltage comparator with filter time



Readable via SPI

Figure 24. Timing for VAS under voltage detection

PSIx reverse voltage threshold

(~VAS)

SPI reverse voltage flag

reverse voltage

shorter than filtertime

reverse voltage

longer than filtertime

PSIx

GAPG2010151150PS

VAS

VAS undervoltage

threshold

Undervoltage flag

undervoltage shorter

than filtertime

undervoltage longer

than filtertime

VAS overvoltage

threshold

Overvoltage flag

overvoltage longer

than filtertime

overvoltage shorter

than filtertime

GAPG2010151205PS

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