L99LD21 datasheet(43/73 Pages) STMICROELECTRONICS

No de pièce	L99LD21

Description	High power LED driver for automotive applications

PDF	73 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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43 / 73 page

DS11130 Rev 5

43/73

L99LD21

SPI functional description

BST_FB_FAIL

Boost feedback pin failure.

This bit is set when FB pin is shorted to ground.

When this bit is set:

– if Boost is in off-state, then it will not be allowed to start up;

– if Boost is in on-state, then it will immediately switched OFF;

– in both cases, no clock is delivered through SYNC_IO pin;

– in addiction, in Limp Home mode COMP pin will be pulled

down.

If BST_DIS = 1, BST_FB_FAIL bit will not be set.

When BST_FB_FAIL = 1, Boost is disabled until a read and

clear command of this bit has been acknowledged.

In LHM, an auto restart procedure cyclically clears

BST_FB_FAIL bit with a period equal to tAUTORESTART.

R/C

DIN_ST

Direct input status bit.

Filtered replica of logical level at DIN pin.

Filtering time is equal to tDIN_ST.

4÷1

0000

Unused

Parity Bit

ODD Parity Bit Check

Table 23. SR#2: Status Register 2 (continued)

Bit

Default

Name

Description

Access

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