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AS1112_1 参数 Datasheet PDF下载

AS1112_1图片预览
型号: AS1112_1
PDF下载: 下载PDF文件 查看货源
内容描述: 16通道LED驱动器,具有点校正和灰度PWM [16-Channel LED Driver with Dot Correction and Greyscale PWM]
分类和应用: 驱动器
文件页数/大小: 18 页 / 611 K
品牌: AMSCO [ AMS(艾迈斯) ]
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AS1112  
Datasheet - Detailed Description  
Power Dissipation  
To ensure proper operation of the device, the total power dissipation of the AS1112 must be below the power dissipa-  
tion rating of the device package. Total power dissipation is calculated as:  
DCn  
PD = (VCC x ICC) + (VOUT x IMAX x n x  
dPWM)  
(EQ 2)  
63  
Where:  
VCC is the device supply voltage;  
ICC is the device supply current;  
VOUT is the device OUTn voltage when driving LED current;  
IMAX is the LED current adjusted by RIREF;  
DCn is the maximum dot correction value for OUTn;  
n is the number of OUTn driving LED at the same time;  
dPWM is the duty cycle defined by pin OEN or the greyscale PWM value.  
Operating Modes  
The AS1112 operates in two modes (see Table 11). Greyscale operating mode (see Figure 12 on page 13) and the shift  
registers are in reset state at power-up.  
Table 11. Operating Modes  
Mode  
Input Shift Register  
192-bit  
Operating Mode  
Greyscale PWM Mode  
0
1
96-bit  
Dot Correction Data Input Mode  
Setting Dot Correction  
The AS1112 can perform independent fine-adjustments to the output current of each channel, i.e., dot correction. Dot  
correction is used to adjust brightness deviations of LEDs connected to the output channels (OUT0:OUT15).  
The device powers up with the following default seetings: DC = 63 and GS = 4095.  
The 16 channels can be individually programmed with a 6-bit word. The channel output can be adjusted in 64 steps  
from 0 to 100% of the maximum output current (IMAX). The output current for each OUTn channel can be calculated as:  
DCn  
IOUTn = IMAX x  
(EQ 3)  
63  
Where:  
IMAX is the maximum programmable output current for each output;  
DCn is the programmed dot correction value for output (DCn = 0 to 63);  
n = 0 to 15  
Dot correction data are simultaneously entered for all channels. The complete dot correction data format consists of 16  
x 6-bit words, which forms a 96-bit serial data packet (see Figure 9). Channel data is put on one by one, and the data  
is clocked in with the MSB first.  
Figure 9. Dot Correction Data Packet Format  
MSB  
95  
LSB  
0
90  
89  
6
5
...  
...  
...  
DC15.5  
DC15.0 DC14.5  
DC1.0  
DC0.5  
DC0.0  
DC OUT15  
DC OUT14:DC OUT1  
DC OUT0  
www.austriamicrosystems.com  
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