L9679P datasheet(179/272 Pages) STMICROELECTRONICS

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L9679P

Remote sensor interface

271

9.3.4

Leakage to battery, sensor open

The sensor interface offers also open sensor detection. The auto-adjusting counter for

remote sensor current sensing will drop to 0 in case the current flowing through RSUx pin is

lower than 2.5 mA typ. The OPENDET fault flag is asserted when the fault condition lasts for

longer than TRSUOP_FILT deglitch filter time. This fault flag can be read from RSDR bits

and any fault will set the RSFLT bit of the global status word register (GSW). The channel in

this condition is not shutdown. This fault bit is cleared upon read or upon channel disabled

via SPI RSCTRL register.

9.3.5

Leakage to ground

The sensor interface offers as well the detection of a leakage to ground condition, which will

possibly raise the sensor current higher than 42 mA/12 mA typ in PSI5/WSS modes

respectively. The CURRENT_HI fault flag is asserted when the fault condition lasts for

longer than TRSUCH_FILT deglitch filter time. This fault flag can be read from RSDR bits and

any fault will set the RSFLT bit of the global status word register (GSW). The channel in this

condition is not shutdown. This fault bit is cleared upon read or upon channel disabled via

SPI RSCTRL register.

9.3.6

Thermal shutdown

Each output is protected by an independent over-temperature detection circuit should the

remote sensor interface thermal protection be triggered the output stage is disabled and a

corresponding thermal fault is latched and reported through the RSTEMP flag in the Remote

Sensor Data Register (RSDRx). The thermal fault flag is cleared when the sensor channel is

first disabled and then re-enabled through the Remote Sensor Configuration Register

(RSCRx).

L9679P 数据表(PDF) 179 Page - STMicroelectronics