STGAP1AS datasheet(41/70 Pages) STMICROELECTRONICS

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STGAP1AS

Functional description

7.14.4

SENSE resistor check

The purpose of this security check is to verify the connection between the device and the

sense shunt resistor and to verify the optional sense resistor filter network is not open.

To perform this test, the following procedure has to be followed:



Set SD = low



Send StartConfig command



Set SENSE_EN = '1'



Set SNSCHK = '1'



Send StopConfig command



Wait tRchk + tSENSERchk



Read SENSE flag

–

SENSE = '0' → OK (VSENSE < VSENSEth)

–

SENSE = '1' → FAIL (VSENSE > VSENSEth)

During the check a small current ISENSERchk is sourced from the SENSE pin (see

Figure 18

). If the sense resistor is not present or floating, SENSE pin voltage will rise and

once VSENSEth is exceeded, a SENSE fault will be reported in the STATUS1 register within

tRchk.

To ensure the check result, the following condition has to be verified:

–

The SENSE flag read has to be delayed of tSENSERchk, which is the time the

customer filtering network and/or the power switch gate takes to reach VSENSEth

by the ISENSERchk current.

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