STCF06TBR datasheet(22/33 Pages) STMICROELECTRONICS

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Description of internal registers

STCF06

22/33

Description of internal registers

9.1

PWR_ON

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

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

I²C interface is active, minimizing Stand-by Mode power consumption.

9.2

TRIG_EN

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

flash mode. By this way, both soft-triggering and hard-triggering of the flash are made

possible. If soft-triggering (through I²C) is chosen, the TRIG pin is not used and must be

kept HIGH (VI). If hard-triggering is chosen, then the TRIG pin has to be connected to a µP

I/O devoted to flash timing control, and the TRIG_EN bit must be set in advance. Both

triggering modes can benefit of the internal flash time counter, that uses the TRIG_EN bit

and can work either as a safety shut-down timer or as a flash duration timer. flash mode can

start only if PWR_ON=1. LED current is controlled by the value set by the FDIM_0~3 of the

DIM_REG.

9.3

TCH_ON

When set from Ready mode, the STCF06 enters the torch mode. The LED current is

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

9.4

NTC_ON

In ready mode, the comparators that monitor the LED temperature are activated if NTC_ON

bit is set. NTC-related blocks are always active regardless of this bit in torch mode and flash

mode.

Table 9. I²C register mapping function

SUB ADDRESS (hex)

Operation

CMD_REG

R / W

DIM_REG

R / W

AUX_REG

R / W

STAT_REG

R only

Table 10. Command register

CMD_REG

(write mode)

MSB

LSB

SUB ADD=00

PWR_ON

TRIG_EN

TCH_ON

NTC_ON

FTIM_3

FTIM_2

FTIM_1

FTIM_0

Power-ON

RESET Value

000

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