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AAT2834 参数 Datasheet PDF下载

AAT2834图片预览
型号: AAT2834
PDF下载: 下载PDF文件 查看货源
内容描述: 240毫安共用于便携式设备的显示解决方案 [240mA Total Display Solution for Portable Devices]
分类和应用: 便携式便携式设备
文件页数/大小: 20 页 / 474 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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AAT2833/34  
240mA Total Display Solution  
for Portable Devices  
120  
100  
80  
60  
40  
20  
0
Backlight Independent Channel Control  
(Address 15)  
The AAT2833/34 can also individually control each  
backlight channel. This mode allows the user to turn  
on some or all of the channels in any desired com-  
bination. This control is achieved by changing the  
2
functionality of the AS Cwire registers. To enable  
individual LED control mode, a user would write  
Data 8 to Address 15. All channels that are enabled  
must carry the same current, which is set using the  
new functionality of Address 1 (see Table 2b).  
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16  
Data Code  
Figure 1: Addresses 0-2 Backlight Current Level.  
Data  
Individual BL Control  
8
On  
Low Backlight Current (Address 3)  
Table 4: Address 15, Backlight Independent  
Channel Control  
In addition to the current levels set by Addresses 0,  
1, and 2 (shown in Table 2a and Figure 1), there is  
also a low backlight current level that can be set. To  
set the low backlight current level, the user would  
write data to Address 3, as shown in Table 3.  
Data  
1
2
3
4
5
6
7
8
BL6  
BL5  
BL4  
BL3  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
On  
On  
On  
On  
On  
On  
On  
On  
Off  
Off  
Off  
Off  
On  
On  
On  
On  
Off  
Off  
Off  
Off  
On  
On  
On  
On  
Off  
Off  
On  
On  
Off  
Off  
On  
On  
Off  
Off  
On  
On  
Off  
Off  
On  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
For example, to toggle between 1.7% and 25% of the  
maximum backlight current on all LEDs, write Data =  
14 to Address 3 and Data 4 to Address 0. To set BL1-  
BL4 to 25% and BL5-BL6 to 0.2%, write Data = 5 to  
Address 3, and Data = 4 to Address 2.  
BL1-BL4  
BL5-BL6  
BL %  
Data  
Current On Current On of BSET  
9
1
2
No  
No  
No  
No  
0
0
10  
11  
12  
13  
14  
15  
16  
3
No  
No  
0
4
No  
No  
0
5
6
7
8
No  
No  
No  
No  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
No  
No  
No  
No  
Yes  
Yes  
Yes  
Yes  
0.2  
1.7  
3.5  
7.0  
0.2  
1.7  
3.5  
7.0  
0.2  
1.7  
3.5  
7.0  
Table 5: Address 2 with Independent  
Channel Control Enabled, BL3-BL6  
On/Off Control.  
9
10  
11  
12  
13  
14  
15  
16  
Table 3: Address 3 with Independent Channel  
Control Disabled, Low-Backlight Current  
Levels (RBSET = 280kΩ).  
2833.2007.09.1.0  
11  
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