L9779WD datasheet(159/170 Pages) STMICROELECTRONICS

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DocID027452 Rev 5

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L9779WD

Functional description

169

DIA_REG9

Diagnostic register 9

Address:

0011b

Type:

Reset:

654

KEY_ON_

STATUS

MRD_OVC

VRS_STAT

VRS_DIAG

VTRK2_DIAG[1:0]

VTRK1_DIAG[1:0]

R/W

[7] KEY_ON_STATUS

1: KEY_ON voltage above KEY_ON_H

0: KEY_ON voltage below KEY_ON_L

[6] MRD_OVC

1: Current MRD status is OFF due to previous Over current

0: Current MRD status is ON (no OVC detected)

[5] VRS_STAT

1: Diag ON

0: Diag OFF

[4] VRS_DIAG

0: No Fault

1: Generic fault detected

This function is only available if VRS is set to fully adaptive mode. When limited adaptive mode

is set, VRS_DIAG always returns 0.

[3-2] VTRK2_DIAG[1:0]: Diagnosis bit of VTRK2

00: Not used

01: Overload condition/out of regulation

10: Overvoltage (OV) or over temperature (OT) (Lower priority respect to Overload condition)

11: Sensor supply VTRK ok

NO FAIL

[1-0] VTRK1_DIAG[1:0]: Diagnosis bit of VTRK1

00: Not used

01: Overload condition/out of regulation

10: Overvoltage (OV) or over temperature (OT) (Lower priority respect to overload condition)

11: Sensor supply VTRK OK

NO FAIL

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