stcf03i STMicroelectronics, stcf03i Datasheet - Page 22

• Manufacturer Part Number: stcf03i
• Description: High Power White Led Driver With I2ctm Interface
• Manufacturer: STMicroelectronics

Table 12. Auxiliary register
8.8
8.9
Table 13. Auxiliary led dimming table
1. 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
Note:
22/33
current [mA]
Internal
current
T_DIM
F_DIM
Resist.
Sense
V
SHUTDOWN MODE
(hex)
(hex)
[mA]
[mV]
AUXI (hex)
LED
step
REF1
AUX LED
SUB ADD=02
RESET Value
(write mode)
AUX_REG
Power ON,
R
R
16
33
0
1
+
TR
FL
R
R
19
40
+
1
2
TR
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.
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.
FL
LED current values refer to R
0.0
R
R
0
23
47
2
3
+
TR
FL
R
R
27
56
1.3
3
4
+
FL
TR
1
AUXI_3
R
R
MSB
32
67
+
4
5
TR
FL
0
2.6
2
R
R
39
80
5
6
+
TR
FL
4.0
R
R
3
46
95
6
7
+
AUXI_2
TR
FL
0
R
113 134 160 190 227
R
55
7
8
+
TR
5.3
FL
4
(1)
R
R
65
8
0
9
+
TR
FL
FL
6.6
=0.27 Ω , R
AUXI_1
5
R
R
77
10
9
1
+
TR
FL
0
8.0
R
R
92
11
6
A
+
2
TR
FL
R
109 124 147 175 209 248 296 352 418 498 592 705 840
R
12
B
3
+
AUXI_0
TR
FL
TR
9.3
7
=1.8 Ω.
0
R
13
33
C
4
FL
10.6 12.0 13.3 14.6 16.0 17.3 18.6 20.0
8
R
14
40
D
5
FL
AUXT_3
R
15
47
E
6
FL
9
0
R
16
56
F
7
FL
A
R
17
67
8
FL
AUXT_2
R
18
79
B
0
9
FL
R
19
95
A
FL
C
AUXT_1
113 134 160 190 227
R
20
B
FL
0
D
R
21
C
FL
R
22
D
FL
E
AUXT_0
LSB
R
23
E
0
FL
F
R
24
F
FL