STCF04 datasheet(23/43 Pages) STMICROELECTRONICS

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STCF04

Description of the internal registers

Doc ID 022927 Rev 3

23/43

Description of the internal registers

Note:

All the registers can be read only when the PWR_ON bit is 1. Reading any register when

PWR_ON = 0, gives 0 regardless of the real value of the register. This concerns command

and feature registers in Monitoring mode and Shutdown + NTC mode.

9.1

Commands (CMD_REG) 00(hex)

9.1.1

PWR_ON

When set, it activates all analog and power internal blocks including the NTC supporting

circuit, and the device is ready to operate (Idle mode). As long as PWR_ON=0, only the I²C

interface is active, minimizing Shutdown mode power consumption.

9.1.2

FLASH_ON

This bit is AND-ed with the FLASH pin to generate the internal signal FL_ON that activates

Flash mode. In this way, both soft-triggering and hard-triggering of the flash are possible. If

soft-triggering (through I²C) is chosen, the FLASH pin is not used and must be kept HIGH

(tied to VBAT). If hard-triggering is chosen, then the FLASH pin must be connected to a

microprocessor I/O devoted to flash timing control, and the FLASH_ON bit must be set in

advance. Both triggering modes can benefit from the internal flash time counter, which uses

the FLASH_ON bit and can work either as a safety shutdown timer or as a flash duration

timer. Flash mode can start only if PWR_ON=1. The LED current is controlled by the value

set by the FDIM_0~2 of the DIM_REG.

9.1.3

TCH_ON

Torch on: when set to 1 from Idle mode, the STCF04 enters Torch mode. The LED current is

controlled by the value set by the TDIM_0~3 of the TORCH_REG.

Table 9.

I²C register mapping

SUB address (hex)

Operation

Description

CMD_REG

R / W

Commands

FL_REG

R / W

Flash register

AUX_REG

R / W

Auxiliary LED

STAT_REG

R only

Status register

FTR_REG

R / W

Features

TRCH_REG

R / W

Torch register

Table 10.

Command register

CMD_REG

(Write mode)

MSB

LSB

SUB ADD=00

PWR_ON FLASH_ON

TCH_ON

NTC_ON

TCHV_H

CHRG

MONTR

N/A

Power-ON

RESET value

0000

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