Description of internal registers

STCF03I

22/33

8.8

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.

8.9

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.

Note:

Table 12.

Auxiliary register

AUX_REG

(write mode)

MSB

LSB

SUB ADD=02

AUXI_3

AUXI_2

AUXI_1

AUXI_0

AUXT_3

AUXT_2

AUXT_1

AUXT_0

Power ON,

SHUTDOWN MODE

RESET Value

00

000

00

0

Table 13.

AUXI (hex)

01

234

567

89

A

B

C

D

E

F

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

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

T_DIM

(hex)

0

1

2

3

4

5

6

7

8

9

A

B

C

D

E

F

F_DIM

(hex)

0

1

2

3

4

5

6

7

8

9

A

B

C

D

E

F

LED

current

[mA]

16

19

23

27

32

39

46

55

65

77

92

109 124 147 175 209 248 296 352 418 498 592 705 840

Internal

step

12345678

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

[mV]

33

40

47

56

67

80

95

113

134

160

190

227

33

40

47

56

67

79

95

113 134 160 190 227

Sense

Resist.

+

+

+

+

+

+

+

+

+

+

+

+