L9912L datasheet(32/84 Pages) STMICROELECTRONICS

Part #	L9912L

Description	Automotive vehicle conform 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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32 / 84 page

Electrical specifications

L9912L

32/84

DocID029641 Rev 2

5.3.13

Pin "L"

L pin is used to drive the fault indicator lamp and the optional auxiliary load relay (lamp drive

mode).

Figure 11. L interface in lamp drive mode

The device exits the stand-by mode when the switch "Key" (see Figure 11) is closed (i.e.

V(L) > VLHTh).

The lamp is driven by an internal low side N-channel MOSFET whereas the relay is driven

by an internal high-side N-channel MOSFET.

The current in low side driver is limited to ILlimLS for a time tLOC, then the driver is switched

off and bit 2 of SPI read register 0x12 is set [13.4.6]; it can again be turned on by means of

a µC command.

The maximum power dissipation allowed is Pretry.

The application software must wait the proper time before turning the lamp driver on again

respecting the max power dissipation over a retry period.

L9912L Datasheet(PDF) 32 Page - STMicroelectronics