L9177ATR datasheet(51/55 Pages) STMICROELECTRONICS

51 / 55 page

Contents

Block diagram and pin description .................................................3

1.1

Block diagram ................................................................. 3

1.2

Pin description ................................................................. 4

Electrical specifications ...........................................................7

2.1

Operating range ............................................................... 7

2.1.1

Supply voltage .......................................................... 7

2.2

Absolute maximum ratings....................................................... 7

2.3

Latch-up test .................................................................. 9

2.4

Temperature ranges and thermal data ............................................. 9

2.5

Electrical characteristics......................................................... 9

2.5.1

Supply................................................................. 9

2.5.2

Key .................................................................. 10

2.5.3

Digital pins ............................................................ 10

2.5.4

Digital output pins ....................................................... 11

2.5.5

5 V voltage regulator ..................................................... 11

2.5.6

Reset ................................................................ 12

2.5.7

5 V tracking voltage regulator .............................................. 13

2.5.8

Standby regulator ....................................................... 13

2.5.9

High side switch ........................................................ 14

2.5.10

Injector driver .......................................................... 15

2.5.11

Relay drivers ........................................................... 17

2.5.12

Current limited low side driver (LSD)......................................... 17

2.5.13

Tachometer driver ....................................................... 18

2.5.14

Stepper motor driver ..................................................... 18

2.5.15

O2 sensor heater driver .................................................. 20

2.5.16

Variable reluctance sensor interface ......................................... 21

2.5.17

K-line ................................................................ 22

2.5.18

SPI interface ........................................................... 23

Functional description ............................................................25

3.1

Chip working conditions ........................................................ 25

L9177A

Contents

DS12175 - Rev 5

page 51/55

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