L99MOD51XP datasheet(8/33 Pages) STMICROELECTRONICS

8 / 33 page

Block diagram and pin description

L99MOD51XP

8/33

DS12667 Rev 6

CM/PWM

Current monitor output/PWM input.

Depending on the selected multiplexer bits (bit 9, 10, 11) of Input Data

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

bidirectional. The microcontroller can overwrite the current monitor

signal to provide a PWM input for all outputs.

CSN

Chip select not input.

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

transfer between L99MOD51XP 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 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

OUT2

Half-bridge output 2 (see OUT1 - pin 3, 4).

Note: for the capability of driving the full current at the outputs all pins of

OUT2 must be externally connected.

20, 21

OUT3

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

Note: for the capability of driving the full current at the outputs all pins of

OUT3 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 (see Figure 1).

Enable input.

If Enable input is forced to GND the device will enter in Standby-Mode.

The outputs will be switched off and all registers will be cleared

33, 35

OUT4, OUT5

High side driver output 4, 5.

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 reverse diode from the output to VS (bulk-

drain-diode). The output is over-current and open-load protected.

Table 2. Pin definitions and functions (continued)

Symbol

Function

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