AAT2847_08 Datasheet, PDF (13/20 Pages) Advanced Analogic Technologies – Four-Channel Backlight Driver with Dual LDOs

ChargePump^TM
EN/SET
Address
DATA₃
DATA₀
PRODUCT DATASHEET
AAT2847
Four-Channel Backlight Driver with Dual LDOs
Address
T _HI
T _LO
T_LAT
1
2
19
20
0
Data
T_LAT
1
2 . . . n ≤ 16
3
1
n
1
Figure 2: AS²Cwire Serial Interface Timing.
Data
1
2
3
4
Current Scale
20mA Scale
30mA Scale
15mA Scale
Low Current Mode
Table 3: Current Scale Settings—Address 3.
Low Current Operation (Address 4)
All four LED channels are programmed to the same low
current level by writing to Address 4 followed by any
Data between, and including, 1 to 4. This operational
mode is especially useful for low current applications
where a continuous low current state is maintained for a
substantial length of time.
Data
1
2
3
4
mA
0.5
1.0
1.5
2.0
Table 4: Low Current Settings—Address 4.
Independent LED Current Control
(Address 5)
Independent LED control allows for individual LEDs to be
enabled and disabled to form custom arrangement of
active LEDs. To enable independent control write Address
5 with Data between, and including, 1 to 16.
Data
D4
D3
D2
D1
1
on
on
on
on
2
on
on
on
off
3
on
on
off
on
4
on
on
off
off
5
on
off
on
on
6
on
off
on
off
7
on
off
off
on
8
on
off
off
off
9
off
on
on
on
10
off
on
on
off
11
off
on
off
on
12
off
on
off
off
13
off
off
on
on
14
off
off
on
off
15
off
off
off
on
16
off
off
off
off
Table 5: Independent LED Control Settings—
Address 5.
2847.2008.05.1.2
www.analogictech.com
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