STGAP1S datasheet(37/67 Pages) STMICROELECTRONICS

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STGAP1S

Functional description

Only one check mode at a time must be enabled. At the end of security check procedure,

the TEST1 register must be set to 0x00 before running the device in normal mode.

It is recommended to clear the status register with the ResetStatus command before and

after each check.

To prevent SD from clearing the STATUS flags, set SD_FLAG = '0' as described in

Section 7.11.

7.14.1

GON to gate path check

The purpose of this security check is to verify the path integrity including the driver's GON

output, the GON (turn-on) gate resistor, the power switch gate and the CLAMP pin (see

Figure 17).

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



Set SD = low



Send StartConfig command



Set GONCHK = '1'



Send StopConfig command



Wait tGchk



Read TSD flag

–TSD = '0' → OK (VCLAMP > VGchk)

–TSD = '1' → FAIL (VCLAMP < VGchk)

Please note that during all the time the check is enabled the gate will be forced high (GON

turned on) regardless the SD pin level. The user test routine has to take into account this

behavior.

In any case, when GONCHK = '1', the protections SENSE and DESAT, if enabled, will

continue to operate protecting the power switch regardless the SD pin.

7.14.2

GOFF to gate path check

The purpose of this security check is to verify the path integrity including the driver's GOFF

output, the GOFF (turn-off) gate resistor, the power switch gate and the CLAMP pin (see

Figure 17).

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



Set SD = low



Send StartConfig command



Set GOFFCHK = '1'



Send StopConfig command



Wait tGchk + tGATE_GOFFchk



Read DESAT flag

–

DESAT = '0' → OK (VCLAMP < VCLAMPth)

–

DESAT = '1' → FAIL (VCLAMP > VCLAMPth)

During the check a small current IGOFFchk will be sourced from the CLAMP pin while GOFF

is on keeping the gate low through the turn-off gate resistor.

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