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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  
9 Detailed Description  
Serial Interface  
The AS1112 features a versatile 3-pin (CLK, SDI, and SDO) serial interface, which can be connected to microcon-  
trollers or digital signal processors in various configurations.  
The rising edge of the CLK signal shifts data from pin SDI to the internal register. After all data is clocked in, the serial  
data is latched into the internal registers at the rising edge of the LD signal.  
Note: All data is clocked in with the MSB first.  
Multiple AS1112 devices can be cascaded by connecting the SDO pin of one device with pin SDI of the next device  
(see Figure 15 on page 15). The SDO pin can also be connected to the microcontroller to receive status information  
from the AS1112. The serial data format is 96-bit or 192-bit wide, depending on mode of the device (see LD on page 2).  
Figure 7. Serial Data Input Timing Diagram  
Dot Correction Mode  
Data Input Cycle  
Greyscale Mode  
Data Input Cycle  
Dot Correction Mode  
Data Input Cycle  
MODE  
tH3  
tSU3  
tH3  
LD  
DCn-1  
LSB  
DCn-1  
MSB-1  
DCn  
MSB  
DCn  
LSB  
GSn  
MSB  
GSn  
LSB  
DCn+1  
MSB  
SDI  
tH2  
tSU2  
tSU2  
CLK  
1
96  
1
192  
1
2
DCn-1  
MSB  
DCn-1  
MSB-1  
DCn-1  
LSB  
DCn  
MSB  
SID  
MSB  
X
X
SDO  
X
Error Information Output  
The open-drain output pin XERR indicates if the device is in one of the two error conditions: overtemperature flag or  
open LED detect. During normal operation, the internal transistor connected to pin XERR is turned off and the voltage  
on XERR is pulled up to VCC through an external pullup resistor.  
If an overtemperature or open LED condition is detected, the internal transistor is switched on, and XERR is pulled to  
GND. Because XERR is an open-drain output, multiple AS1112 devices can be ORed together and pulled up to VCC  
with a single pullup resistor (see Figure 15 on page 15). This reduces the number of signals needed to report a system  
error.  
To differentiate the overtemperature flag from the open LED detect flag from pin XERR, the open LED detect flag can  
be masked out by setting OEN = 1 (see Table 9).  
www.austriamicrosystems.com  
Revision 1.06  
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