AS1121
Datasheet - D e t a i l e d D e s c r i p t i o n
Setting Dot Correction
The AS1121 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 maxi-
mum output current (I MAX ). The output current for each OUT n channel can be calculated as:
I OUT n = I MAX x
DC n
63
(EQ 3)
Where:
I MAX is the maximum programmable output current for each output;
DC n is the programmed dot correction value for output (DC n = 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 19) . Channel data is put on one by one, and the data is clocked in with the MSB first.
Figure 19. Dot Correction Data Packet Format
MSB
LSB
95
90
89
6
5
0
DC15.5
...
DC15.0
DC14.5
...
DC1.0
DC0.5
...
DC0.0
DC OUT15
Figure 20. Dot Correction Data Input Timing Diagram
Dot Correction Mode
Data Input Cycle n
V CC
MODE
GND
DC OUT14:DC OUT1
DC OUT0
Dot Correction Mode
Data Input Cycle n +1
SDI
DC n -1
LSB
DC n
MSB
DC n
MSB-1
DC n
MSB-2
DC n
LSB+1
DC n
LSB
DC n +1
MSB
DC n +1
MSB-1
t SU0
t WH0
CLK
1
2
1
95
96
1
2
t WL0
SDO
DC n -1
MSB
DC n -1
MSB-1
DC n -1
MSB-2
DC n -1
LSB+1
DC n -1
LSB
DC n
MSB
DC n
MSB-1
DC n
MSB-2
t WH2
LD
t SU1
t H1
www.austriamicrosystems.com/AS1121
Revision 1.01
13 - 21
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