AATIAN36 Datasheet, PDF (3/7 Pages) SiGe Semiconductor, Inc. – Step-Up DC/DC Converter

EV-130
AAT1231 EVAL: Step-Up DC/DC Converter
for White LED Backlight Applications
User Interface Functionality
Button(s) Pushed
SW1 (Up)
SW2 (Down)
SW3 (Select)
Description
[Push/Release once] Increment the number of EN/SET edges. Toggles through the
available brightness level settings for the backlighting section.
[Holding 1.5 sec.+] Auto-increment one voltage level per second.
[Push/Release once] Decrement the number of EN/SET edges. Toggles through the
available dimming level settings for the backlighting section.
[Holding 1.5 sec.+] Auto-decrement one voltage level per second.
[Push/Release once] Toggles the SEL logic pin High/Low.
Table 1: User Interface Functionality.
Rising Clock
Edges/Data
Register
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SEL = Low
Reference
Voltage (V)
LED Current (mA);
R_BALLAST = 30.1Ω
0.1 (default)
3.32
0.12
3.99
0.14
4.65
0.16
5.32
0.18
5.98
0.20
6.64
0.22
7.31
0.24
7.97
0.26
8.64
0.28
9.30
0.30
9.97
0.32
10.63
0.34
11.30
0.36
11.96
0.38
12.62
0.40
13.29
SEL = High
Reference
Voltage (V)
LED Current (mA);
R_BALLAST = 30.1Ω
0.3 (default)
9.97
0.32
10.63
0.34
11.30
0.36
11.96
0.38
12.62
0.40
13.29
0.42
13.95
0.44
14.62
0.46
15.28
0.48
15.95
0.50
16.61
0.52
17.28
0.54
17.94
0.56
18.60
0.58
19.27
0.60
19.93
Table 2: AAT1231 S²Cwire Reference Feedback Voltage Control Settings with R_BALLAST = 30.1Ω
(Assume Nominal Values).
EV-130.2006.08.1.0
3