L9965P datasheet(103/104 Pages) STMICROELECTRONICS

103 / 104 page

List of figures

Figure 1.

Block diagram .................................................................... 3

Figure 2.

Pinout (top view) ................................................................... 4

Figure 3.

Device FSM ..................................................................... 10

Figure 4.

ERBST controller working principle ..................................................... 14

Figure 5.

Wake-up condition by peripheral SPI .................................................... 21

Figure 6.

FAULTN integrity check in full power mode................................................ 23

Figure 7.

FAULTN cyclic pulse generation start.................................................... 23

Figure 8.

FAULTN integrity check in low power mode (example of timeout detected by L9965C) .................. 23

Figure 9.

FAULTN integrity check in low power mode (example of fault detected by L9965P) .................... 24

Figure 10.

Pyro-fuse deployment stage architecture ................................................. 25

Figure 11.

FENx line integrity check in PWM mode (example of timeout detection) ............................ 29

Figure 12.

FENx line integrity check in PWM mode (example of frequency out of range) ........................ 29

Figure 13.

FENx decoder times in PWM mode ..................................................... 29

Figure 14.

FENx line integrity check in level mode (example of timeout on FENH) ............................ 30

Figure 15.

Example of two pyro-drivers in a system ................................................. 31

Figure 16.

Pyro-fuse input model .............................................................. 34

Figure 17.

Fire good signal selection ........................................................... 35

Figure 18.

Diagnostic routine ................................................................. 39

Figure 19.

Differential ADC HWSC ............................................................. 40

Figure 20.

VRCM test ...................................................................... 42

Figure 21.

Pyro outputs leakage test............................................................ 44

Figure 22.

Pyro igniter resistance measurement.................................................... 46

Figure 23.

HS/LS deployment FETs test ......................................................... 48

Figure 24.

ER capacitor diagnostic ............................................................. 50

Figure 25.

ER cap discharge path ............................................................. 51

Figure 26.

ER cap discharge pins voltage profiles .................................................. 52

Figure 27.

ERBST management during ER cap diag................................................. 53

Figure 28.

SPI timing diagram ................................................................ 65

Figure 29.

Application circuit: 12 V battery with MCU and ERBST mounted ................................. 85

Figure 30.

Application circuit: 12 V DC-DC with MCU and ERBST mounted ................................. 86

Figure 31.

Application circuit: 12 V DC-DC with L9965C and ERBST mounted ............................... 87

Figure 32.

Application circuit: 24 V DC-DC with MCU and ERBST not mounted .............................. 88

Figure 33.

Pyro-fuse driver positioning .......................................................... 90

Figure 34.

VFQFN32 (5x5x0.9 mm 32+4L WETT. FLANKS) package outline ................................ 92

Figure 35.

VFQFN32 (5x5x0.9 mm 32+4L WETT. FLANKS) footprint ..................................... 94

Figure 36.

TQFP32L (7x7x1 mm 32+4L exposed pad down) package outline................................ 95

Figure 37.

TQFP32L (7x7x1 mm 32+4L exposed pad down) pcb landpattern ................................ 97

L9965P

List of figures

DS14702 - Rev 4

page 103/104

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