L9924L datasheet(18/84 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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18 / 84 page

Electrical specifications

L9924L

18/84

DocID028840 Rev 3

If A+/B+ voltage overcomes the VBIntOvp value, the system switches the field excitation off

and sets bit 7 of SPI read register 0x12 [12.4.6]: it's up to the application software to take the

appropriate actions (lamp on, drivers off, etc.).

A+/B+ signal, suitably conditioned and filtered by an 'active' divider equipped with a low-

pass filter, is forwarded to µC pin AIN5.

Figure 7. VB overvoltage protection

4.3.2

Pin "SENSE"

The system battery can be alternatively sensed using the SENSE input, instead of A+

sensing path.

A suitable resistor ladder can be selected by means of bit 12 of SPI write register 0x02,

depending on the device operating mode (12 V or 24 V [12.4.11]).

The signal, before being forwarded to µC pin AIN9, is filtered through single pole low-pass

filter.

Figure 8. Internal resistor ladder on pin SENSE

L9924L Datasheet(PDF) 18 Page - STMicroelectronics