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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  
The RGB period can be calculated using the follow-  
ing equation:  
RGB Control  
The Red, Green, and Blue LED PWM timing, along  
with the overall period, is controlled by five registers.  
The current level for the RGB LEDs is controlled by  
another register (Address 12) which makes it possi-  
ble to change the peak currents from 33% up to  
200% of the backlight maximum current set by  
T = [(DATA10 - 1) · 3 + 15] · 128μs  
Where T is the period of repetition and DATA10 is  
the data input into Register 10. In the AAT2833,  
DATA10 can be set to a value from 1 to 16, with the  
default DATA10 value equal to 1. In the AAT2834,  
DATA10 can be set from 1 to 4, with the default  
DATA10 value equal to 1.  
RBSET  
.
A mode register (Address 11) sets the  
method of update for the color and intensity regis-  
ters. All registers are updated simultaneously or indi-  
vidually, depending on how the mode register is set.  
If updated simultaneously, the color registers are  
updated when the period register is updated. Up to  
4096 different color/brightness combinations are pro-  
grammable in the AAT2833 and 64 color/brightness  
combinations are programmable in the AAT2834.  
Please note that if the user sets the period to be  
smaller than the combined on-times (R+G+B),  
then the RGB sequence will automatically begin  
again once time T has been reached, whether or  
not all on-times have been completed.  
Address 11: RGB Mode Register  
Address 7, 8, 9: RGB Color Registers  
The AAT2833/34's RGB mode register can have  
one of two DATA11 values. If DATA11 is set to 1 (the  
default), then each RGB LED on-time will be updat-  
ed immediately after their respective register is set.  
If DATA11 is set to 2, then as the user sets the Red,  
Green, and Blue on-time registers, none of the  
LEDs will be updated until the timebase register is  
set. For example, if the user wants to set a certain  
Red-Green-Blue combinations, the Red on-time  
can be programmed first, followed by the Green on-  
time, followed by the Blue on-time, and then the  
RGB period T last. If DATA11 is set to 1, then after  
the Red on-time is programmed the user will see  
the Red LED turn on immediately. After the Green  
on-time is programmed, the Red-Green color com-  
binations will appear, etc. If DATA11 is set to 2, then  
none of those intermediate colors will appear until  
the RGB period register T has been set and loaded.  
The AAT2833's RGB color registers store up to 16  
levels of lighting intensity for a given color channel.  
The first level (DATA = 1) is reserved for the off-state.  
Every setting thereafter increases the on-time of the  
respective LED by 128µs. The settings can be cal-  
culated as follows:  
R = (DATA7 - 1) · 128μs  
G = (DATA8 - 1) · 128μs  
B = (DATA9 - 1) · 128μs  
Where R, G, and B are the on-times of the respec-  
tive LEDs and DATA7, DATA8, and DATA9 are the  
data inputs into Registers 7, 8, and 9, respectively.  
DATAN can be set to a value from 1 to 16 with the  
default DATAN value equal to 1. Since the AAT2834  
supports 64 color/brightness combinations, DATAN  
can be set from 1 to 4.  
Address 12: RGB Current Level Register, ISINK  
The ISINK current level in the RGB LED can be  
adjusted by writing data to Register 12. The maxi-  
mum current is two times (200%) the maximum  
backlight current set by RBSET (see Table 7). By  
increasing or decreasing the current, the brightness  
level can easily be changed for any particular color  
combination.  
Address 10: RGB Timebase Register - T  
The overall period is set by the AAT2833/34's T reg-  
ister. Adjusting this register allows a user to adjust  
how often the RGB LED sequence is repeated. The  
longer the period, the smaller the effective duty cycle,  
and thus RGB light intensity (brightness) is reduced.  
2833.2007.09.1.0  
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