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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)： | 12/20頁 |
| 文件大?。?/td> | 392K |
| 代理商： | TQFN34-20 |
AAT2847
Four-Channel Backlight Driver with Dual LDOs
12
2847.2007.09.1.0
Figure 1: LED Current Control Profile.
AS
2
Cwire Serial Interface
Each white LED channel input on the AAT2847
(D1-D4) is controlled by AnalogicTech's AS
2
Cwire
serial digital interface. The AS
2
Cwire interface uses
the number of rising edges on the EN/SET pin to
address and load the LED configuration registers.
AS
2
Cwire latches data or addresses after the
EN/SET pin has been held logic high for longer
than T
LAT
(500μs). Addresses and data are differ-
entiated by the number of EN/SET rising edges.
Since the data registers are 4 bits each, the differ-
entiating number of pulses is 2
4
or 16, so that
Address 0 is signified by 17 rising edges, Address
1 by 18 rising edges, Address 2 by 19 rising edges,
and so on. Data is set to any number of rising
edges between, and including, 1 to 16.
A typical write protocol consist of the following:
First a burst of EN/SET rising edges that
identify/target a particular address followed by
EN/SET being held logic high for the T
LAT
timeout
period to latch the address value in the address
register, then another burst of rising edges that sig-
nify data with the accompanying T
LAT
timeout peri-
od to latch the data value in the data register. Once
an address is set, then multiple writes to the corre-
sponding data register are allowed without having
to write to the address for every value change in
the data register. When EN/SET is held low longer
than T
OFF
(500μs), the AAT2847 enters shutdown
mode operation and draws less than 1μA from the
input supply voltage. Data and address registers
are cleared (0 for the address register and 1 for the
data registers) in shutdown mode operation.
AS
2
Cwire Serial Interface Addressing
Table 1: AS
2
Cwire Serial Interface Addressing.
Current Operation (Address 0)
Use Address 0 to program all four LED channels
with the current values in Table 2. All four white
LED channels are programmed to the same cur-
rent level by writing to Address 0 followed by any
Data between, and including, 1 to 16.
0.0
5.0
10.0
15.0
20.0
25.0
30.0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
1
2
3
4
Code
L
Address 0
Address 4
Figure 2: AS
2
Cwire Serial Interface Timing.
Address
Data
1
EN/SET
2
19
20
Address
DATA
3
DATA
0
1
2 . . .
n
≤
16
0
3
1
1
n
T
HI
T
LO
T
LAT
T
LAT
Address
0
3
4
5
EN/SET
Edges
17
20
21
22
Addressed Register
D1-D4 Current Control
Current Scale
Low Current Control
Independent LED Control
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