L9945 datasheet(146/151 Pages) STMICROELECTRONICS

146 / 151 page

5.4.5

Internal and external clamping ............................................. 26

5.4.6

Electrical characteristics .................................................. 27

5.5

H-bridge ..................................................................... 28

5.5.1

H-Bridge driving modes................................................... 28

5.5.2

H-Bridge diagnostics ..................................................... 30

5.5.3

H-bridge dead time ...................................................... 30

5.5.4

H-bridge disabling ....................................................... 32

5.5.5

Overcurrent detection strategies for H-Bridge .................................. 32

5.5.6

Current limitation for H-Bridge.............................................. 33

5.5.7

H-Bridge OFF state diagnostic timings ....................................... 36

5.6

Peak & Hold.................................................................. 36

5.6.1

Peak & Hold driving mode................................................. 36

5.6.2

Peak & Hold diagnostics .................................................. 36

5.6.3

ON state diagnostics ..................................................... 37

5.6.4

OFF state diagnostics .................................................... 37

5.7

Internal oscillator .............................................................. 39

5.7.1

Spread spectrum........................................................ 39

5.7.2

Internal oscillator electrical characteristics .................................... 39

5.8

Digital I/Os ................................................................... 40

5.8.1

Digital I/Os electrical characteristics ......................................... 40

5.9

Serial Peripheral Interface (SPI) ................................................. 41

5.9.1

SPI Quick Look ......................................................... 41

5.9.2

Parallel operation ....................................................... 41

5.9.3

Daisy chain ............................................................ 41

5.9.4

SPI electrical characteristics signal and the timing diagram ....................... 42

5.9.5

SPI protocol ........................................................... 44

5.10

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

5.10.1

COMMAND X frame partitioning ............................................ 46

5.10.2

RESPONSE X frame partitioning ........................................... 72

Safety & diagnostics............................................................ 117

6.1

Disable sources.............................................................. 117

6.1.1

DIS & NDIS pins ....................................................... 117

L9945

Contents

DS12275 - Rev 8

page 146/151

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