L9908_V01 datasheet(145/152 Pages) STMICROELECTRONICS

145 / 152 page

5.8.3

Digital Output (DO) ...................................................... 44

5.9

Internal clock ................................................................. 44

5.9.1

Spread Spectrum Modulation (SSM)......................................... 45

5.9.2

Internal Clock Monitor (ICM) ............................................... 45

5.10

Motor Battery Monitor (MBM) ................................................... 45

5.11

Gate driver supply ............................................................. 48

5.11.1

Pre-regulation stage ..................................................... 49

5.11.2

VBP monitor ........................................................... 50

5.11.3

VPRE monitor .......................................................... 52

5.11.4

Supply distribution stage .................................................. 54

5.11.5

VCP monitor ........................................................... 57

5.12

Half bridges gate drivers ....................................................... 59

5.12.1

External FET VGS monitor ................................................ 66

5.12.2

Dead Time Protection (DTP) ............................................... 66

5.12.3

Shoot-Through Protection (STP) ............................................ 67

5.13

Current monitors .............................................................. 70

5.13.1

A/D conversion ......................................................... 72

5.13.2

Digital signal processing .................................................. 78

5.13.3

D/A conversion ......................................................... 86

5.13.4

Current monitor A/D - D/A chain ............................................ 88

5.14

Off-State diagnosis (OFD) ...................................................... 90

5.15

On State Diagnosis (OND)...................................................... 94

5.16

Phase Voltage Feedback (PVF) ................................................. 98

5.16.1

CSO3 - PVF multiplexing ................................................ 100

5.17

Actuation Timers (ACT) .......................................................100

5.18

Ground Loss Monitor (GLM) ...................................................102

5.19

Temperature Monitor (OTM) ...................................................102

5.20

Serial Peripheral Interface (SPI) ................................................104

5.20.1

Protocol description..................................................... 105

5.20.2

Frame description ...................................................... 107

5.20.3

Frame monitoring ...................................................... 110

5.20.4

Error handling ......................................................... 110

5.20.5

5.21

Window watchdog timer (WTD).................................................130

Application circuit .............................................................. 135

6.1

12 V/24 V systems ...........................................................135

6.2

48 V systems ................................................................136

L9908

Contents

DS13546 - Rev 5

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