L9903

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Table 2. Pin Function

Figure 3. Pin Connection (Top view)

N°

Pin

Description

1

ST

Open Drain Switch for Stepup converter

2

DG

Open drain diagnostic output

3

PWM

PWM input for H-bridge control

4

EN

Enable input

5

DIR

Direction select input for H-bridge control

6

PR

Programmable cross conduction protection time

7

RX

ISO 9141 interface, receiver output

8

TX

ISO 9141 interface, transmitter input

9

K

ISO 9141 Interface, bidirectional communication K-line

10

VS

Supply voltage

11

CP

Charge pump for driving a power MOS as reverse battery protection

12

GH1

Gate driver for power MOS highside switch in halfbridge 1

13

CB1

External bootstrap capacitor

14

S1

Source/drain of halfbridge 1

15

GH2

Gate driver for power MOS highside switch in halfbridge 2

16

CB2

External bootstrap capacitor

17

S2

Source/drain of halfbridge 2

18

GL2

Gate driver for power MOS lowside switch in halfbridge 2

19

GL1

Gate driver for power MOS lowside switch in halfbridge 1

20

GND

Ground

ST

DG

PWM

EN

DIR

RX

PR

TX

K

GH1

CB1

S1

CB2

GH2

S2

GL2

GL1

GND

1

3

2

4

5

6

7

8

9

18

17

16

15

14

12

13

11

19

10

20

VS

CP

SO20