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AS1112B 参数 Datasheet PDF下载

AS1112B图片预览
型号: AS1112B
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  
Figure 12. Greyscale Data Input Timing Diagram  
Dot Correction Mode  
Data Input Cycle  
1st Greyscale Mode  
Data Input Cycle After Dot Correction Input  
Following Greyscale Mode  
Data Input Cycle  
MODE  
tH3  
tSU3  
LD  
tH3  
GSn  
MSB  
DCn-1  
LSB  
GSn  
LSB  
GSn+1  
MSB  
GSn+1  
LSB  
SDI  
tH2  
tSU1  
tSU2  
tH0  
1
CLK  
96  
192  
1
192  
SIDn  
MSB-1  
DCn-1  
MSB-1  
DCn-1  
MSB  
SIDn  
MSB-2  
SIDn  
LSB  
SIDn  
MSB  
SIDn  
MSB  
SDO  
x
x
x
Status Information Data (SID)  
The AS1112 contains an integrated status information register, which can be accessed in greyscale mode (MODE =  
GND). Once the LD signal latches the data into the greyscale register, the input shift register data is replaced with sta-  
tus information data (see Figure 13).  
Open, shorted LED, temperature warning and overtemperature flags as well as the dot-correction registers can be  
read out at pin SDO. The status information data packet is 192 bits wide. Bits 191:176 and 31:16 contain the open LED  
detection status of each channel (either 191:176 or 31:16 can be used for readout). Bit 175 contains the thermal error  
flag status. Bit 174 contains the temperature warning flag. Bits 167:72 contain the data of the dot-correction register. Bit  
15:0 contains the LED shorted flags. The remaining bits are reserved. The complete status information data packet is  
shown in Figure 13.  
Figure 13. Status Information Data Packet Format  
MSB  
191  
LSB  
0:15  
176  
175  
174  
168  
X
167  
72  
71  
X
16:31  
LOD  
...  
...  
...  
LOD15  
...  
LOD0  
TEF  
TWF  
DC15.  
DC0.  
LSD  
Open LED  
Detect  
Overtempera-  
ture  
DC Values  
Bit #  
Description  
LED Short Detection, LSD  
Bit #  
168:173  
174  
Description  
0:15  
16:31  
32:71  
72:167  
Undefined  
LED Open Detection (Optional, same as bits 176:191), LOD  
Undefined  
Temperature Warning Flag (TWF, 125ºC, typ)  
Temperature Error Flag (TEF, 150ºC, typ)  
LED Open Detection, LOD  
175  
Dot Correction Readback (16 x 6 Bit)  
176:191  
Greyscale PWM Operation  
The falling edge of the OEN signal initiates a greyscale PWM cycle. The first GSCLK pulse after the falling edge of  
OEN increments the greyscale counter by one and switches on any OUTn whose greyscale value does not equal zero.  
Each subsequent rising edge of GSCLK increments the greyscale counter by one.  
The AS1112 compares the greyscale value of each OUTn channel with the greyscale counter value. All OUTn whose  
greyscale values equal the counter values are switched off. A OEN = 1 signal after 4096 GSCLK pulses resets the  
greyscale counter to zero and completes a greyscale PWM cycle (see Figure 14).  
www.austriamicrosystems.com  
Revision 1.06  
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