L9679E datasheet(122/127 Pages) STMICROELECTRONICS

122 / 127 page

SPIDEPEN.................................................................... 39

LP_GNDLOSS ................................................................. 40

VERSION_ID .................................................................. 41

CLK_CONF ................................................................... 42

SAFING_STATE................................................................ 43

DIAG_STATE .................................................................. 43

SYSDIAGREQ ................................................................. 44

LPDIAGSTAT .................................................................. 45

LPDIAGREQL ................................................................. 48

LPDIAGREQH ................................................................. 50

DIAGCTRL_x (x=A, B, C, D) ...................................................... 52

RSCRx (x=0, 1, 2, 3) ............................................................ 54

RSCTRL ..................................................................... 56

ARM_STATE .................................................................. 57

LOOP_MATRIX_ARMx (x=1, 2) .................................................... 58

6.5

Remote sensor SPI register map ................................................ 59

6.6

Remote sensor SPI tables ...................................................... 60

6.6.1

Remote sensor SPI global status word ....................................... 60

RSDRx(x=0 to 11) @FLT = 0 ...................................................... 61

RSDRx (x=0 to 11) @FLT=1 ...................................................... 63

RSTHRx_L.................................................................... 66

Deployment drivers ...............................................................67

7.1

Control logic .................................................................. 67

7.1.1

Safe operating area vs deployment current profiles ............................. 69

7.1.2

Deploy command expiration timer ........................................... 70

7.1.3

Deployment control flow .................................................. 70

7.1.4

Deployment current monitoring ............................................. 71

7.1.5

Deployment success .................................................... 71

7.2

Deployment voltage ........................................................... 72

7.3

Deployment driver protections ................................................... 72

7.3.1

Delayed low side deactivation .............................................. 72

7.3.2

Low-side voltage clamp................................................... 72

7.3.3

Short-to-battery ......................................................... 72

7.3.4

Short-to-ground......................................................... 72

7.3.5

Intermittent open squib/pyroswitch .......................................... 72

7.4

Diagnostics .................................................................. 72

7.4.1

Low-level diagnostic approach ............................................. 73

7.4.2

High-level diagnostic approach ............................................. 78

L9679E

Contents

DS12485 - Rev 8

page 122/127

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