L9945 datasheet(139/144 Pages) STMICROELECTRONICS

139 / 144 page

5.5.4

H-bridge disabling ....................................................... 31

5.5.5

Overcurrent detection strategies for H-Bridge .................................. 31

5.5.6

Current limitation for H-Bridge.............................................. 32

5.5.7

H-Bridge OFF state diagnostic timings ....................................... 35

5.6

Peak & Hold.................................................................. 35

5.6.1

Peak & Hold driving mode................................................. 35

5.6.2

Peak & Hold diagnostics .................................................. 35

5.6.3

ON state diagnostics ..................................................... 36

5.6.4

OFF state diagnostics .................................................... 36

5.7

Internal oscillator .............................................................. 38

5.7.1

Spread spectrum........................................................ 38

5.7.2

Internal oscillator electrical characteristics .................................... 38

5.8

Digital I/Os ................................................................... 39

5.8.1

Digital I/Os electrical characteristics ......................................... 39

5.9

Serial Peripheral Interface (SPI) ................................................. 40

5.9.1

SPI Quick Look ......................................................... 40

5.9.2

Parallel operation ....................................................... 40

5.9.3

Daisy chain ............................................................ 40

5.9.4

SPI electrical characteristics signal and the timing diagram ....................... 41

5.9.5

SPI protocol ........................................................... 43

5.10

SPI MOSI/MISO list ........................................................... 44

5.10.1

COMMAND X frame partitioning ............................................ 45

5.10.2

RESPONSE X frame partitioning ........................................... 68

Safety & diagnostics............................................................ 109

6.1

Disable sources..............................................................109

6.1.1

DIS & NDIS pins ....................................................... 109

6.1.2

VDD5 Overvoltage/Undervoltage .......................................... 110

6.1.3

BIST & HWSC......................................................... 111

6.1.4

VPS undervoltage ...................................................... 112

6.1.5

Charge pump undervoltage............................................... 112

6.1.6

SPI enable bit ......................................................... 113

6.1.7

Protection disable bit.................................................... 113

6.1.8

EN6 input ............................................................ 113

6.1.9

NRES assertion ....................................................... 113

6.1.10

Communication Check (CC) .............................................. 113

6.2

Diagnostics overview ......................................................... 114

6.3

ON state diagnostics.......................................................... 116

L9945

Contents

DS12275 - Rev 10

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