L9663 datasheet(43/104 Pages) STMICROELECTRONICS

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L9663

Diagnosis

103

The PSIx lines (sensor supply lines) are monitored for under voltage if the PSIx line is

switched on.

The current status of the under voltage comparators is shown in the SPI register SR2.

The logical state of the voltage comparator is debounced internally by a filter.

While any reset is active (POR, RESETN or SW_RESET), the PSIx lines are switched off.

After reset is released, the failure bits are reset and the voltage supply at PSIx lines kept off.

4.3

PSIx short circuit detection

The short circuit monitoring detects a short of the sensor supply line PSIx to GND, limits the

current to ISTG (max 130mA) for tIfilt and then switches off the affected PSIx line.

Basic features:



Short to ground circuit monitoring with filter time



Automatic deactivation of the PSIx line in case of a short to GND



Readable via SPI

The PSIx lines (sensor supply lines) are monitored to detect a short circuit to GND if the

PSIx line is switched on. In this case, the corresponding fault SPI bit STGx in SR2 register

is set to '1' and the PSIx line is switched off (the status of the interfaces is reported in SR3

confirmation is sent on the line that was under short to ground condition. The current status

(on/off) of the PSI interfaces can be read via SPI.

The line can be switched on again by switching off and on via SPI.

The logical state of the short to ground monitoring is debounced internally by a filter. The

monitoring is deactivated during a configurable blanking time after startup of the interface.

This time is selectable through BLANKING_SEL parameter in SPI register ADVSET1

(default value is 128 μs)

During reset is active, the PSIx lines are switched off. After reset is released, the failure bits

are reset and the voltage supply at PSIx lines can be switched on by SPI command. It is

possible to reset the transceiver IC by sending an SPI command (SW Reset).

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