L9924L datasheet(50/84 Pages) STMICROELECTRONICS

부품명	L9924L

상세설명	Automotive vehicle conform truck car alternator regulator IC with LIN

PDF	84 Pages

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50 / 84 page

Watchdog

L9924L

50/84

DocID028840 Rev 3

The following picture illustrates a typical watchdog refresh sequence.

Figure 23. Typical watchdog refresh sequence

6.1

Power stage watchdog handling

When a watchdog error occurs, the power stage is in the following conditions:



Excitation off



DFM off (the relevant SPI bits are cleared)



LIN TX off (the relevant SPI bit is cleared)



Lamp drivers:

–

on/off or off/on. The relevant outputs are conditioned by the relevant activation bits

in SPI register (L_HS_EN and L_LS_EN) that cannot be on at the same time and

with a default value of 1 for LS and 0 for HS. The effective lamp status is

conditioned by L_KEY status.



High current lamp drivers:

–

on/off or off/on. The relevant outputs are conditioned by the relevant activation bits

in SPI register (LHC_HS_EN and LHC_LS_EN) that cannot be on at the same

time and with a default value of 1 for LS and 0 for HS. The effective lamp status is

conditioned by LHC_KEY status.

L9924L 데이터시트(PDF) 50 Page - STMicroelectronics