L9953 datasheet(7/38 Pages) STMICROELECTRONICS

7 / 38 page

L9953 / L9953XP

Block diagram and pin description

Doc ID 14278 Rev 3

7/38

6, 7, 14, 15,

23, 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 highside 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 OUT7.

CSN

Chip select not input / test mode

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

transfer between L9953 and micro controller is enabled by pulling the

input CSN to low level. If an input voltage of more than 7.5V is applied

to CSN pin the L9953 will be switched into a test mode.

Serial data output

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

output will remain in tristate, if the chip is not selected by the input CSN

(CSN = high)

VCC

Logic supply voltage

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

recommended.

CLK

Serial clock input

This input controls the internal shift register of the SPI and requires

CMOS logic levels.

16,17, 20,21,

OUT4

OUT5

Half-bridge-output 4,5: see OUT1 (pin 3).

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

pins of OUT4 (OUT5, respectively) must be externally connected.

Charge pump output

This output is provided to drive the gate of an external n-channel power

MOS used for reverse polarity protection

PWM1

PWM1 input:

This input signal can be used to control the drivers OUT1-OUT6 and

OUT8 by an external PWM signal.

Table 2.

Pin definitions and functions (continued)

Symbol

Function

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