L9918 datasheet(5/109 Pages) STMICROELECTRONICS

5 / 109 page

Overcurrent protection is an independent protection which command the shutdown of EXC power stage in case a

maximum current threshold is overcame (Section 4.2.6 Excitation current measurement).

1.3.11

Temperature measurements

A temperature sensor monitors the junction temperature of the regulator. The tolerance is ±10 °C.

1.3.12

High temperature voltage limitation

L9918 implements a thermal compensation function in order to protect EXC field driver against high temperature

(Section 2.2.3 Thermal compensation).

1.3.13

Self-start

The regulator can be activated even in case of failed or not activated LIN communication. After the self-start, the

regulator performs as a multifunction stand-alone regulator with default parameters.

1.3.14

Non volatile memory (NVM)

L9918 contains an NVM memory with a high number of programmable bits. This allows users to apply many

different configurations in order to address a wide range of applicative scenarios. NVM programming is operated

by LIN communication through a specific “programming mode procedure” and it is typically done at the end of

production line. NVM can be programmed 16 times at most.

1.3.15

Local interconnect network (LIN) interface

The regulator has a bidirectional serial data LIN interface to communicate with the Engine Control Unit (ECU).

The Physical Layer is compliant with LIN 2.2A specification. The Data Link Layer is compliant with LIN 1.3, 2.1,

2.2 and 2.2A LIN specifications.

LIN configuration addresses following functions:

•

Control of the set-point voltage regulation

•

Control of LRC parameters (rise time, LRC disable speed, blind zone)

•

Setting of the excitation current limitation

•

Excitation duty cycle feedback

•

Excitation current feedback

•

High temperature feedback

•

Diagnosis information feedback (LIN error and alternator failure detection)

•

Alternator supplier code feedback

•

Alternator class code feedback

•

Chip supplier identification

•

Chip identification

1.3.16

Compatibility with different alternator types

All the RPM speed values specified respect 5, 6, 7, 8 or 9 pole pair alternator definition.

L9918

List of device features

DS13000 - Rev 2

page 5/109

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