AAT2869 Advanced Analogic Technologies, Inc., AAT2869 Datasheet - Page 13

• Manufacturer Part Number: AAT2869
• Description: Fade-in/fade-out 4 Channel Backlight Driver With Dual Ldos
• Manufacturer: Advanced Analogic Technologies, Inc.

2869.2010.01.1.0
SystemPower
Current
Table 4: AS
Codes
LED
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
1
2
3
4
5
6
7
8
9
Address 2
2
BL4
Cwire Register Addresses 2 and 3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
TM
BL3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Address 3
BL2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Fade-In/Fade-Out 4 Channel Backlight Driver with Dual LDOs
BL1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
BL0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
w w w . a n a l o g i c t e c h . c o m
Current
[default]
(mA)
LED
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.0
31.0
0.4
0.9
1.9
2.9
3.9
4.9
6.0
7.0
8.0
9.0
1
.
Address 4 – LDO Enable Control
The AAT2869 includes two low dropout (LDO) linear
regulators. These regulators are powered from the bat-
tery and produce a fixed output voltage which is set using
the AS
4 turns the two LDOs on/off through the AS
interface. An internal resistor is used to discharge the
LDO output voltage when the LDO is disabled.
Address 5 - LDO Voltage Output Setting
Register address 5 is used to set the LDOA and LDOB
output voltage levels. Sixteen combinations of the two
LDOs can be programmed by the 4 bits of the register.
LDOA can be set to one of four levels: 1.5V, 1.8V, 2.8V, or
3.0V. LDOB can be set to one of four levels: 1.2V, 1.5V,
1.8V, or 2.8V. The LDO regulators require only a small
2.2μF ceramic output capacitor for stable operation. If
improved load transient response is required, larger-val-
ued capacitors can be used without stability degradation.
Description
LDOA Off,
LDOA Off,
LDOA On,
LDOA On,
LDOB Off
LDOB On
LDOB Off
LDOB On
[Default]
2
Table 5: AS
Cwire serial interface. AS
LDOA_EN LDOB_EN
2
Cwire Register Address 4.
0
0
1
1
PRODUCT DATASHEET
AAT2869
2
Data
0
1
0
1
Cwire address register
Rising Edges
EN/SET
2
Cwire serial
1
2
3
4
13