L9678P datasheet(75/203 Pages) STMICROELECTRONICS

75 / 203 page

DocID029274 Rev 3

75/203

L9678P, L9678P-S

SPI interface

202

Updated by SSM_RESET or Loops diagnostic state machine or when HS or

LS FET is activated during DIAG state

0 FET is off during

diagnostic

1 FET is on during

diagnostic

ST_reserved

0 ST_reserved

HSR_HI

HSR Diagnostic - HIGH Range

Updated by SSM_RESET or Loops diagnostic state machine or when squib

resistance test is run

0 HSR measurement



< HSR HIGH value

1 HSR measurement



> HSR HIGH value

HSR_LO

0 HSR Diagnostic - Low Range

Updated by SSM_RESET or Loops diagnostic state machine or when squib

resistance test is run

1 HSR measurement< HSR LOW value

0 HSR measurement > HSR LOW value

RES_MEAS_CHSEL

[3:0]

0000 0000 0000 Channel selected for resistance measurement

Updated by SSM_RESET or Loops diagnostic state machine or as

determined by squib resistance channel selected

0000 = Ch 0

0001 = Ch 1

0010 = Ch 2

0011 = Ch 3

0100 - 1111 None Selected

HIGH_LEV_DIAG_

SELECTED[3:0]

0000 0000 0000

0000 No diagnostic selected

0001 VRCM CHECK

0010 Leakage CHECK

0011 Short Between Loops CHECK

0100 Unused

0101Squib resistance range CHECK

0110 Squib resistance measurement

0111 FET test

1000 - 1111 Unused

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