Description of internal registers

STCF03

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8

Description of internal registers

8.1

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

8.2

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

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.

8.3

TCH_ON

When set from Ready Mode, the STCF03 enters the Torch mode. The LED current is

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

8.4

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.

Register name

SUB ADDRESS (hex)

Operation

CMD_REG

00

R / W

DIM_REG

01

R / W

AUX_REG

02

R / W

STAT_REG

03

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

0

0

000

0

0

0