STCF05 Datasheet, PDF (22/33 Pages) STMicroelectronics – High power white LED driver with I²C interface

Registers description
STCF05
9.7
FDIM_0~2
These 3 bits define the LED current in flash mode in 8 exponential steps. Max current value
in flash mode is 400 mA.
9.8
LDIM
Is an internal dimming register. It cannot be accessed by the user directly. The LDIM value is
determined by the TDIM and FDIM registers. The total number of dimming steps is 13,
because flash and torch current values are overlapping. See Table 14 below.
Figure 12. Current intensity vs. dimming value
400
360
320
280
240
200
160
120
80
40
0
0
2
4
6
8
10
12
14
dimming steps
Table 12. Auxiliary register
AUX_REG
(write mode)
MSB
SUB ADD=02
AUXI_3 AUXI_2
Power ON,
SHUTDOWN MODE
0
0
RESET Value
AUXI_1
0
LSB
AUXI_0 AUXT_3 AUXT_2 AUXT_1 AUXT_0
0
0
0
0
0
9.9
AUXI_0~3
This 4 bits register defines the AUX LED current from 0 to 20 mA. See AUX LED Dimming
Table for reference. Loading any value between 1 and 15 also starts the AUX LED current
source timer, if enabled. The AUX LED current source is active only in ready mode, and is
deactivated in any other mode.
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Doc ID 15257 Rev 4