STCF05 datasheet(23/33 Pages) STMICROELECTRONICS

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STCF05

Registers description

Doc ID 15257 Rev 4

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9.10

AUXT_0~3

This 4 bit register controls the timer that defines the ON-time of the AUX LED current

source. ON-time starts when the AUXI register is loaded with any value other than zero, and

stops after the time defined in the AUXT register. Values from 1 to 14 of the AUXT register

correspond to an ON-time of the AUX LED ranging from 100 to 1400 ms in 100 ms steps.

The value 15 puts the AUX LED to the continuous light mode. The activation/deactivation of

the AUX LED current source is controlled using only the AUXI register.

9.11

LED_S

This bit is set by the STCF05 when the voltage seen on the current mirror is above 1.2 V

during a torch or flash operation. This condition can be caused by shorted LEDs, This bit is

reset by the STCF05 following a read operation of the STAT_REG.

9.12

F_RUN

This bit is kept HIGH by the STCF05 during flash mode. By checking this bit, the

microprocessor can verify if the flash mode is running or has been terminated by the time

counter.

Table 13.

Auxiliary LED dimming table (1)

AUXI (hex)

234

567

AUX LED

current [mA]

0.0

1.3

2.6

4.0

5.3

6.6

8.0

9.3

10.6 12.0 13.3 14.6 16.0 17.3 18.6 20.0

20 mA output current is achievable only if the supply voltage is higher than 3.3 V.

Table 14.

Torch mode and flash mode dimming registers settings

LDIM (hex)

TDIM (hex)

FDIM(hex)

LED current [mA]

120

160

200

240

320

400

Internal step

Table 15.

Status register

STAT_REG

(read mode)

MSB

LSB

SUB ADD=03

LED_S

F_RUN

LED_O

NTC_W

NTC_H

OT_F

OC_F

VOUTOK_N

Power ON,

SHUTDOWN MODE

RESET Value

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