L9954LXP datasheet(7/35 Pages) STMICROELECTRONICS

7 / 35 page

L9954LXP

Block diagram and pin description

Doc ID 16186 Rev 3

7/35

Table 2.

Pin definitions and functions

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

High-side driver output 6

The output is built by a high-side 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 high-side 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

Half-bridge output 1,2,3

The output is built by a high-side and a low-side switch, which are

internally connected. The output stage of both switches is a power

DMOS transistor. Each driver has an internal parasitic reverse diode

(bulk-drain-diode: high-side driver from output to VS, switchs driver

from GND to output). This output is over-current and open-load

protected.

6, 7, 14, 25,

28, 32

Power supply voltage (external reverse protection required)

For this input a ceramic capacitor as close as possible to GND is

recommended.

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

pins of VS must be externally connected.

8DI

Serial data input

The input requires CMOS logic levels and receives serial data from the

microcontroller. The data is an 24bit control word and the least

significant bit (LSB, bit 0) is transferred first.

CM/PWM2

Current monitor output/PWM2 input

Depending on the selected multiplexer bits of input data register this

output sources an image of the instant current through the

corresponding high-side driver with a ratio of 1/10.000. This pin is

bidirectional. The microcontroller can overdrive the current monitor

signal to provide a second PWM input for the output OUT5.

CSN

Chip select not input

This input is low active and requires CMOS logic levels. The serial data

transfer between L9954LXP and micro controller is enabled by pulling

the input CSN to low-level.

Serial data output

The diagnosis data is available via the SPI and this 3-state output. The

output remains in 3-state, if the chip is not selected by the input CSN

(CSN = high)

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