L9177 datasheet(35/49 Pages) STMICROELECTRONICS

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L9177 Fiches technique(PDF) 35 Page - STMicroelectronics

No de pièce	L9177

Description	Peripheral on chip for low end engine control

PDF	49 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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35 / 49 page

DocID17617 Rev 1

35/49

L9177

Functional description

Figure 23. Low side driver diagnosis I-V relationship

4.5.5

Lamp driver on/off diagnosis

In OFF condition diagnosis is the same as Low side, with Tmask 3.5 ms ±25 % and

Tdgc_noise 3.6 μs ± 40 %, while in ON condition initial Inrush current is masked for

Tmask_rush of 45 ms ±25 % then, if an over current fault occurs the drivers enters in current

limitation condition for a digital filtering time Tdgc of 20 μs ±25 %, then it is switched OFF

and the fault is latched. The channel is turned ON again by input command transition. The

latched fault is cleared on request via SPI. Over current fault has higher priority with respect

to OFF condition faults.

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