L99MOD50XP datasheet(8/42 Pages) STMICROELECTRONICS

8 / 42 page

Block diagram and pin description

L99MOD50XP

8/42

DS12615 Rev 4

Table 2. Pin definition 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

OUT11

High-side driver output 11.

The output is built by a high-side switch and is intended for resistive loads, therefore

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 protected.

Important: for the capability of driving the full current at the outputs both pins of OUT11

must be externally connected!

OUT1,

OUT2,

OUT3

Halfbridge outputs 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,

low-side driver from GND to output). This output is over-current protected.

6, 7, 14, 15,

23, 24, 25, 28,

29, 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! Pins 25 and 32 can be connected to VS to maintain

compatibility with other L99MOD products; otherwise they should be left Not

Connected

8DI

Serial data input.

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

The data is a 24 bit control word and the most significant bit (MSB, bit 23) is transferred

first.

CM/

PWM2

Current monitor output/PWM2 input.

Depending on the selected multiplexer bits of the control register this output sources an

image of the instant current through the corresponding high-side driver with a ratio of

1/10.000 or 1/2000. This pin is bidirectional. The microcontroller can overdrive the

current monitor signal to provide a second PWM input for the outputs OUT5, OUT8 and

OUT10.

CSN

Chip Select Not input

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

between L99MOD50XP and the microcontroller 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

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,

OUT6

Half-bridge outputs 4,5,6: 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!

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