L9177ATR datasheet(54/55 Pages) STMICROELECTRONICS

54 / 55 page

List of figures

Figure 1.

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

Figure 2.

Pin connection (top view) ............................................................. 4

Figure 3.

Input threshold ................................................................... 10

Figure 4.

Key block diagram ................................................................ 10

Figure 5.

5 V main regulator block diagram ...................................................... 12

Figure 6.

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

Figure 7.

5 V tracking regulator block diagram .................................................... 13

Figure 8.

5 V standby regulator block diagram .................................................... 14

Figure 9.

High-side driver block diagram ........................................................ 15

Figure 10.

Low-side driver block diagram ........................................................ 16

Figure 11.

Low-side timing diagram (injectors, relays, current limited LSD, tach, O2H) ......................... 16

Figure 12.

Stepper motor driver block diagram ..................................................... 19

Figure 13.

Stepper motor operations............................................................ 20

Figure 14.

VRS block diagram ................................................................ 22

Figure 15.

K-line block diagram ............................................................... 23

Figure 16.

SO loading for disable time measurement ................................................ 24

Figure 17.

SPI timing diagram ................................................................ 24

Figure 18.

Current generator block diagram....................................................... 26

Figure 19.

Power-up sequence ............................................................... 27

Figure 20.

Power-down sequence ............................................................. 27

Figure 21.

An example of under and over voltage time diagram ......................................... 30

Figure 22.

Low side driver diagnosis time diagram .................................................. 31

Figure 23.

Low side driver diagnosis I-V relationship................................................. 32

Figure 24.

Current limited low side driver diagnosis time diagram ........................................ 33

Figure 25.

Stepper motor driver diagnosis time diagram .............................................. 34

Figure 26.

Stepper motor driver diagnosis I-V relationship ............................................. 34

Figure 27.

VRS diagnosis I-V relationship ........................................................ 35

Figure 28.

VRS typical characteristics ........................................................... 35

Figure 29.

VRS interface structure ............................................................. 36

Figure 30.

Auto-adaptive hysteresis block diagram .................................................. 36

Figure 31.

Hysteresis output voltage level ........................................................ 36

Figure 32.

Input-output behaviour of VRS interface.................................................. 38

Figure 33.

Auto-adaptative time filter behaviour 1 ................................................... 39

Figure 34.

Auto-adaptative time filter behaviour 2 ................................................... 39

Figure 35.

Low side drivers slew rate implementation ................................................ 40

Figure 36.

Low side drivers slew rate ........................................................... 41

Figure 37.

O2H low side driver slew rate ......................................................... 42

Figure 38.

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

Figure 39.

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

Figure 40.

Recommended footprint............................................................. 49

L9177A

List of figures

DS12175 - Rev 5

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