AS1121-BQFT austriamicrosystems, AS1121-BQFT Datasheet - Page 10

• Manufacturer Part Number: AS1121-BQFT
• Description: IC LED DRIVER 16-CH 30V 32-TQFN
• Manufacturer: austriamicrosystems

Specifications of AS1121-BQFT

• Constant Current: Yes
• Internal Driver: Yes
• Type - Primary: Backlight, General Purpose
• Type - Secondary: Color
• Mounting Type: *
• Topology: PWM
• Number Of Outputs: 16
• Voltage - Supply: 3.1 V ~ 3.6 V
• Voltage - Output: 1.5 V ~ 30 V
• Package / Case: *
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency: -
• Other names: AS1121-BQFTTR

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
Where:
I
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
Figure 5. Dot Correction Data Packet Format
Figure 6. Dot Correction Data Input Timing Diagram
www.austriamicrosystems.com/LED-Driver-ICs
MAX
is the maximum programmable output current for each output;
DC15.5
MSB
MODE
95
SDO
CLK
SDI
LD
DC OUT15
DCn-1
...
LSB
V
GND
DCn-1
CC
MAX
MSB
t
). The output current for each OUTn channel can be calculated as:
SU0
DC15.0
MSB
DCn
90
1
MSB-1
(see Figure
DCn-1
DC14.5
MSB-1
t
89
DCn
WH0
Dot Correction Mode
Data Input Cycle n
2
MSB-2
DCn-1
t
WL0
5). Channel data is put on one by one, and the data is clocked in with the MSB first.
MSB-2
DCn
1
I
OUTn
DC OUT14:DC OUT1
DCn-1
LSB+1
= I
Revision 1.00
LSB+1
MAX
DCn
...
95
DCn-1
x
LSB
t
SU1
DCn
63
96
DCn
LSB
MSB
DCn
DC1.0
Data Input Cycle n +1
t
Dot Correction Mode
WH2
6
t
H1
DC0.5
5
DCn+1
MSB
1
DC OUT0
MSB-1
DCn
...
DCn+1
MSB-1
2
MSB-2
DCn
DC0.0
LSB
0
(EQ 3)
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