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參數(shù)資料
| 型號： | TQFN34-20 |
| 廠商： | ANADIGICS, Inc. |
| 英文描述： | Four-Channel Backlight Driver with Dual LDOs |
| 中文描述： | 四通道雙LDO的背光驅(qū)動器 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 392K |
| 代理商： | TQFN34-20 |
AAT2847
Four-Channel Backlight Driver with Dual LDOs
2847.2007.09.1.0
13
Current Scale (Address 3)
The AAT2847 has three selectable current scales for
the four white LED channels: 30mA, 20mA, and
15mA. Only one of the three current scales can be
active at any given time. By default, the 20mA current
scale is active upon start-up. To change to the 30mA
or 15mA current scale, or go back to the 20mA scale,
write to Address 3 with the appropriate Data between,
and including, 1 to 3. To enable low current mode,
write Data 4 to Address 3. Low current mode results
in the four white LED channels reverting to the cur-
rent set by the low current settings in Address 4.
Table 2: Current Settings—Address 0.
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 oper-
ational mode is especially useful for low current
applications where a continuous low current state
is maintained for a substantial length of time.
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 independ-
ent control write Address 5 with Data between, and
including, 1 to 16.
Table 5: Independent LED Control Settings—
Address 5.
Data
1
2
3
4
Current Scale
20mA Scale
30mA Scale
15mA Scale
Low Current Mode
Data 30mA Scale 20mA Scale 15mA Scale
1
30.0
2
28.5
3
26.6
4
25.2
5
23.3
6
21.8
7
19.8
8
18.5
9
16.5
10
15.0
11
13.1
12
11.6
13
9.8
14
8.3
15
6.3
16
4.8
20.0
19.0
17.7
16.8
15.5
14.5
13.2
12.3
11.0
10.0
8.7
7.7
6.5
5.5
4.2
3.2
15.0
14.3
13.3
12.6
11.6
10.9
9.9
9.2
8.3
7.5
6.5
5.8
4.9
4.1
3.2
2.4
Data
1
2
3
4
mA
0.5
1.0
1.5
2.0
Data
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D4
on
on
on
on
on
on
on
on
off
off
off
off
off
off
off
off
D3
on
on
on
on
off
off
off
off
on
on
on
on
off
off
off
off
D2
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
D1
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
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