L9177ATR datasheet(52/55 Pages) STMICROELECTRONICS

52 / 55 page

3.2

Chip bias current generation .................................................... 25

3.3

Power up/down sequences ..................................................... 26

3.4

SPI ......................................................................... 27

3.4.1

Data in (DIN) ........................................................... 27

3.4.2

Data out .............................................................. 29

3.5

Diagnosis .................................................................... 29

3.5.1

Voltage regulators thermal warning and shutdown .............................. 29

3.5.2

Overvoltage shut down ................................................... 30

3.5.3

Undervoltage shut down .................................................. 30

3.5.4

Low side on/off diagnosis (INJ, RLY's, TACH, O2H) ............................. 30

3.5.5

Current limited low side driver on/off diagnosis ................................. 32

3.5.6

Stepper motor driver OFF diagnosis (EN signal low and output in high impedance state). 33

3.5.7

Stepper motor driver ON diagnosis (EN signal high and output driven by input commands) .

..................................................................... 33

3.5.8

VRS diagnosis ......................................................... 35

3.6

VRS interface................................................................. 35

3.6.1

Function characteristic ................................................... 35

3.6.2

Auto-adaptative hysteresis ................................................ 36

3.6.3

Auto-adaptative time filter ................................................. 38

Low side drivers ..................................................................40

Application circuit ................................................................43

5.1

Bill of material ................................................................ 43

Package information..............................................................45

6.1

TQFP 10x10 64L exposed pad down package information ........................... 45

Revision history .......................................................................50

L9177A

Contents

DS12175 - Rev 5

page 52/55

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