Block diagram and pin description

L9954 / L9954XP

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Doc ID 14279 Rev 4

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Block diagram and pin description

Figure 1.

Block diagram

Table 2.

Pin definitions and functions

Pin

Symbol

Function

1, 18, 19, 36

GND

Ground :

Reference potential

Important: for the capability of driving the full current at the outputs all

pins of GND must be externally connected.

2, 35

OUT6

Highside-driver-output 6

The output is built by a highside switch and is intended for resistive

loads, hence the internal reverse diode from GND to the output is

missing. For ESD reason a diode to GND is present but the energy

which can be dissipated is limited. The highside driver is a power

DMOS transistor with an internal parasitic reverse diode from the

output to VS (bulk-drain-diode). The output is over-current and open

load protected.

Important: for the capability of driving the full current at the outputs both

pins of OUT6 must be externally connected.

OUT1

OUT2

OUT3

OUT6

M

M

Charge

Pump

PWM2 / CM

CSN

CLK

DO

DI

VS

VCC

VCC

V

BAT

µC

GND

Mirror Common

Mirror Vertical

Mirror Horizontal

Lock / Folder

1k

MUX

4

Defroster

PWM1

OUT4

OUT5

1k

1k

1k

1k

1k

* Note: Value of capacitor has to be choosen carefully to limit the VS voltage below absolute

maximum ratings in case of an unexpected freewheeling condition (e.g. TSD, POR)

*

** Note: Resistors between µC and L9954LXP are recommended to limit currents

for negative voltage transients at VBAT (e.g. ISO type 1 pulse)

Reverse Polarity

Protection

**

**

**

**

**

**

100µF

Programmable

Bulb (10W) or

LED Mode