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AAT2846_08 参数 Datasheet PDF下载

AAT2846_08图片预览
型号: AAT2846_08
PDF下载: 下载PDF文件 查看货源
内容描述: 高电流电荷泵,带有双LDO用于背光和闪光应用 [High Current Charge Pump with Dual LDO for Backlight and Flash Applications]
分类和应用:
文件页数/大小: 22 页 / 1412 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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PRODUCT DATASHEET  
AAT2846  
ChargePumpTM High Current Charge Pump with Dual LDO for Backlight and Flash Applications  
flash channel current level, write to Address 5 to enable  
a single channel or both channels according to Table 5.  
Flash Current FL1, FL2 (Address 4)  
The current level for the flash channels FL1 and FL2 is  
Data  
FL1  
FL2  
programmed by Address 4. Data 1 enables the maximum  
current level. The maximum current level is determined  
by the value of RFSET. Table 4 and Figure 3 illustrate the  
additional flash current levels that are available.  
1
2
3
4
Off  
Off  
On  
On  
Off  
On  
Off  
On  
Flash LED Current  
(% of Maximum)  
Table 5: Output Enable Control, Address 5.  
Data  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
100  
87  
77  
66  
58  
50  
44  
39  
35  
30  
27  
24  
20  
17  
16  
14  
Writing to Address 5 enables the flash channels indefi-  
nitely. FL1 and FL2 will remain ON until Address 5 is  
re-programmed to OFF, ENS is strobed low to shutdown  
the device, or the flash safety timer times out after FEN  
has been strobed high. The flash safety timer is always  
activated when FEN is taken high. The Address 5 data  
setting is always reset to Data 1 when the flash timer  
expires or when FEN is strobed low.  
Maximum Backlight Current  
(Address 12)  
There are two separate current level scales that apply to  
Addresses 0-2: 20mA and 30mA. According to the  
Maximum Backlight Current setting at Address 12, only  
one of the two scales can be active at any given time  
and never both. By default, the 20mA scale is active on  
startup. To change to the 30mA scale, or go back to the  
20mA scale, write to Address 12.  
Table 4: Data Code for the Flash Current Control,  
Address 4.  
120  
IFLED = 100%  
at Data 1  
Since only one of the scales can be active at any given  
time, the 20mA and 30mA scales cannot be mixed  
between main and sub. When setting Address 12 to the  
30mA scale, only current levels from that scale can be  
mixed between main and sub.  
100  
80  
60  
IFLED = 14%  
at Data 16  
40  
Data  
Maximum Current  
20  
0
1
2
20mA  
30mA  
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16  
Data Code  
Table 6: Data Code for the Maximum Current  
Settings, Address 12.  
Figure 3: Data Code for Address 4 vs.  
Percentage of Flash Current Level.  
Backlight Independent Channel Control  
(Address 15)  
Independent Flash ON/OFF Control  
(Address 5)  
The AAT2846 has a unique independent channel control  
mode whereby individual backlight LED channels can be  
enabled and disabled to form a custom arrangement of  
active channels.  
Use Address 5 to program which flash channels are  
active. By default, both flash channels are OFF at start-  
up. After writing to Address 4 to program the desired  
w w w . a n a l o g i c t e c h . c o m  
12  
2846.2008.03.1.1