L99MM70XP datasheet(10/68 Pages) STMICROELECTRONICS

10 / 68 page

Pin definitions and functions

L99MM70XP

10/68

Doc ID 022637 Rev 2

VS (Reg)

Power supply voltage (external reverse protection required):

for this input a ceramic capacitor as close as possible to GND and an electrolytic capacitor

to buffer the voltage during negative transients is recommended.

LIN

LIN bus line

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 overcurrent and open-load

protected.

INH/PWM3

Inhibit input:

wake-up from external CAN transceiver. This pin has a second functionality. The

microcontroller can use the INH signal to provide a third PWM input for the output OUT8.

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).

PWM1

PWM1 input:

This input signal can be used to control the drivers OUT1-OUT5, OUT7, and OUT9 by an

external PWM signal.

NRES

Low active reset output to the microcontroller:

internal pull up of typ. 100k



PWM2

PWM2 input:

This input signal can be used to control the driver OUT6 by an external PWM signal.

ECDR

ECDR: using the device in EC control mode this pin is used to control the gate of an

external MOSFET.

OUT8

High-side driver output 8:

see OUT6

Note: This output can be configured to supply a bulb with low on-resistance or a LED

with higher on-resistance in a different application.

OUT7/EC

High-side driver output 7:

see OUT6

Note: Beside the bit 8 in control register 2 this output can be switched on setting bit 0 for

electrochrome control mode with higher priority.

ECFD

ECFD:

using the device in EC control mode this pin is used as “virtual GND” for the EC-glass. For

EC-glasses, that require a negative discharge voltage, this supplies the fast discharge

voltage. If no EC-glass is used, this pin must be connected to ground.

ECV

ECV:

Using the device in EC control mode this pin is used as voltage monitor input. For fast

discharge an additional low-side-switch is implemented.

This pin can be used as “stand alone” low-side as well. This output is intended for resistive

loads only

Table 2.

Pin definition and functions (continued)

Symbol

Function

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