L9918 datasheet(3/109 Pages) STMICROELECTRONICS

3 / 109 page

1.2

Pin description

Figure 2. Pins connection diagram (top view)

LIN

GND

B+

EXC

GADG1604191525PS

Table 1. Pin description

N°

Function

EXC

High side driver output to control the rotor current

B+

Device power supply and Battery voltage sensing

GND

Regulator ground

LIN

Communication terminal

Phase sense input

1.2.1

EXC

This pin is connected to the excitation coil (rotor) of the alternator. The IC supplies a current to the rotor in order to

control the output current of the alternator when car load or car speed varies. Device target is to maintain battery

voltage at defined set point. Inside the device is also embedded a freewheeling circuit, needed to discharge the

rotor current when the High Side power is turned OFF.

1.2.2

B+

The device is supplied by this pin. This voltage is also used as feedback voltage by the regulation loop.

1.2.3

GND

The device has one GND pin.

1.2.4

LIN

This LIN pin represents the single-wire bus transmitter and receiver. It is suited for automotive bus systems and is

based on LIN protocol defined in LIN bus specification v1.3, v2.1, v2.2 and v2.2A.

1.2.5

This pin is connected to one of the stator windings. Its input signal is used for rotor speed measurement, stator

voltage monitoring as well as self-start detection. During the regulation, phase signal voltage level is continuously

monitored. Phase regulation function is activated if phase amplitude is not addressing desired levels.

1.3

List of device features

The device is designed to satisfy the below features:

1.3.1

Standby current

When L9918 is in standby state, the average power consumption is very low over all temperatures. Current

consumption can slightly increase while the device is evaluating wakeup sources: device perform a partial wake

up in order to check if eventual signals on phase or LIN pin are valid wakeup events. However even during this

partial wakeup, current consumption remains well below the wakeup state consumption.

L9918

Pin description

DS13000 - Rev 2

page 3/109

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