L9912 datasheet(48/84 Pages) STMICROELECTRONICS

Nome de Peças	L9912

Descrição Electrónicos	Automotive vehicle conform car alternator regulator IC

PDF	84 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

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48 / 84 page

Warning, alarms and faults

L9912

48/84

DocID029639 Rev 2

6.2

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 [5.3.11]



Phase error: persistent absence of phase signal [13.4.7]



Phase regulation error: a persistent phase regulation request [13.4.7]

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.

L9912 Folha de dados(PDF) 48 Page - STMicroelectronics