L9678P datasheet(136/215 Pages) STMICROELECTRONICS

136 / 215 page

Remote sensor interface

L9678P, L9678P-S

136/216

DS11626 Rev 9

7.2.4

Leakage to battery, open condition

The remote sensor interface offers detection of an open sensor condition. The auto-

adjusting counter for remote sensor current sensing will drop to 0 in case the current flowing

through RSUx pin is lower than 3 mA. 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.

7.2.5

Leakage to ground

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

possibly raise the sensor current higher than 36 mA. 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.

7.2.6

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).

L9678P Datasheet(PDF) 136 Page - STMicroelectronics