L99MM70XP datasheet(9/68 Pages) STMICROELECTRONICS

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L99MM70XP

Pin definitions and functions

Doc ID 022637 Rev 2

9/68

Pin definitions and functions

Table 2.

Pin definition and functions

Symbol

Function

1, 18,

19, 36

GND

Ground:

reference potential

Note: For the capability of driving the full current at the outputs all pins of GND must be

externally connected!

2, 7, 32

VS (Power1) Power supply voltage for outputs OUTX and ECFD (external reverse protection required):

for this input a ceramic capacitor as close as possible to GND is recommended.

Note: For the capability of driving the full current at the outputs all pins of VS must be

externally connected! Pins 2, 7 and 32 are internally connected, too. Pin 22 is the

power supply for outputs OUT4, 5 and 6.

VS (Power2)

3, 4

OUT9

High-side driver output 9:

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 overcurrent and open-load protected.

Note: For the capability of driving the full current at the outputs both pins of OUT9 must

be externally connected!

35, 5,

6, 21,

OUT1, OUT2,

OUT3, OUT4,

OUT5

Half bridge outputs 1,2,3,4,5:

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 overcurrent and open-

load protected.

8CSN

Chip select not input:

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

the L99MM70XP and the microcontroller is enabled by pulling the input CSN to low-level.

9CM

Current monitor output:

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

1/10000 or 1/2000.

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).

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.

CLK

Serial clock input:

this input controls the internal shift register of the SPI and requires CMOS logic levels.

VCC

Voltage regulator output:

5 V supply e.g. microcontroller, CAN transceiver.

RXD

Receiver output of the LIN 2.1 transceiver.

TXD

Transmitter input of the LIN 2.1 transceiver

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