L99LD21 datasheet(39/73 Pages) STMICROELECTRONICS

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DS11130 Rev 5

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L99LD21

SPI functional description

5.4.2

Status Register description

SR#1: Status Register 1

Address:

0x05h

Type:

R, R/C

9876

543210

VLED1,ON

VLED2,ON

R/C

Table 22. SR#1: Status Register 1

Bit

Default

Name

Description

Access

23÷16

00000000

VLED1,ON

ADC conversion related to VLED1 (ranging from 0 V to 52.5 V),

sampled during on time of Buck1.

Note that in case of Buck1 controlled by DIN pin or by SPI, the

ADC is continuously refreshed during on-state, while, if

controlled by internal PWM dimming generator, ADC refresh

occurs only once per period just before the end of each PWM

on-cycle.

R/C

15÷8

00000000

VLED2,ON

ADC conversion related to VLED2 (ranging from 0 V to 52.5V),

sampled during on time of Buck2.

Note that in case of Buck2 controlled by DIN pin or by SPI, the

ADC is continuously refreshed during on-state, while, if

controlled by internal PWM dimming generator, ADC refresh

occurs only once per period just before the end of each PWM

on-cycle.

R/C

SHT1

VLED1 short circuit detection.

This bit is set when TON_MIN_OP1 is set too but only if, at the

same instant, average VLED1 voltage is lower than 1.5V.

When SHT1 = 1, Buck1 is disabled until a read and clear

command of this bit has been acknowledged.

In LHM, an auto restart procedure cyclically clears this bit with

a period equal to tAUTORESTART

R/C

SHT2

VLED2 short circuit detection.

This bit is set when TON_MIN_OP2 is set too but only if, at the

same instant, average VLED2 voltage is lower than 1.5V.

When SHT2 = 1, Buck2 is disabled until a read and clear

command of this bit has been acknowledged.

R/C

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