L9945 datasheet(147/151 Pages) STMICROELECTRONICS

147 / 151 page

6.1.2

VDD5 Overvoltage/Undervoltage .......................................... 118

6.1.3

BIST & HWSC......................................................... 119

6.1.4

VPS undervoltage ...................................................... 120

6.1.5

Charge pump undervoltage............................................... 120

6.1.6

SPI enable bit ......................................................... 121

6.1.7

Protection disable bit.................................................... 121

6.1.8

EN6 input ............................................................ 121

6.1.9

NRES assertion ....................................................... 121

6.1.10

Communication Check (CC) .............................................. 121

6.2

Diagnostics overview .........................................................122

6.3

ON state diagnostics..........................................................124

6.3.1

Behavior in case of OC detection .......................................... 124

6.3.2

Output re-engagement strategy after an OC event ............................. 125

6.3.3

OC sensing strategy .................................................... 125

6.3.4

OC threshold selection .................................................. 126

6.3.5

OC detection timings.................................................... 128

6.3.6

Temperature compensation for OC threshold ................................. 129

6.3.7

Battery compensation for OC threshold...................................... 130

6.3.8

Reading the compensated OC threshold..................................... 131

6.3.9

OC detection schematics ................................................ 131

6.4

OFF state diagnostics.........................................................133

6.4.1

Settling and deglitch filter times............................................ 134

6.4.2

Diagnostic thresholds ................................................... 135

6.4.3

Internal regulator for open load (OL) detection ................................ 135

6.4.4

Fast charge/discharge currents............................................ 136

6.5

Silent diagnostic pulses for static loads ..........................................138

6.6

Summary of disable sources and faults ..........................................139

6.7

Signal integrity check .........................................................139

Package information............................................................ 141

7.1

TQFP64 (10x10x1 mm exp. pad down) package information ........................141

Revision history ..................................................................... 144

L9945

Contents

DS12275 - Rev 8

page 147/151

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