L9924L datasheet(48/84 Pages) STMICROELECTRONICS

Part #	L9924L

Description	Automotive vehicle conform truck car alternator regulator IC with LIN

PDF	84 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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48 / 84 page

Warning, alarms and faults

L9924L

48/84

DocID028840 Rev 3

5.2

Lamp

The dashboard lamp (L or LHC) is used to notify faulty events to the driver.

At start-up the lamp driver is, by default, switched on and must be switched off just after

crank.

The lamp must be activated if one or more of the following conditions are present:



Excitation overcurrent (signaled in register 0x12)



Battery overvoltage (signaled in register 0x12)



Discrepancy between the applied excitation and the effective field excitation. A short to

battery is not signaled by any flag of SPI registers but can be detected by comparing

the two excitations [4.3.11]



Phase error: persistent absence of phase signal [12.4.7]



Phase regulation error: a persistent phase regulation request [12.4.7]

Any of the above condition, before causing a lamp warning, must be confirmed for a lamp

confirmation time (hundreds of milliseconds).

When all above error conditions disappear, after a lamp-off confirmation time (hundreds of

microseconds), the lamp is switched off.

L9924L Datasheet(PDF) 48 Page - STMicroelectronics