AS1112-BQFT austriamicrosystems, AS1112-BQFT Datasheet - Page 12

• Manufacturer Part Number: AS1112-BQFT
• Description: IC DRIVER LED 16-CHAN 32-TQFN
• Manufacturer: austriamicrosystems
• Type: Constant Currentr

Specifications of AS1112-BQFT

• Constant Current: Yes
• Topology: PWM
• Number Of Outputs: 16
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: Color
• Frequency: 30MHz
• Voltage - Supply: 3 V ~ 5.5 V
• Voltage - Output: 15V
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 69mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -

AS1112
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 10. Dot Correction Data Input Timing Diagram
Setting Greyscale Brightness
The brightness of each channel output can be adjusted using a 12 bits-per-channel PWM control scheme which results in 4096 brightness steps,
from 0% to 100% brightness. The brightness level for each output is calculated as:
Where:
GSn is the programmed greyscale value for OUTn (GSn = 0 to 4095);
n = 0 to 15 greyscale data for all outputs.
The device powers up with the following default seetings: GS = 4095 and DC = 63.
The input shift register shifts greyscale data into the greyscale register for all channels simultaneously. The complete greyscale data format con-
sists of 16 x 12 bit words, which forms a 192-bit wide data packet
Note: The data packet must be clocked in with the MSB first.
Figure 11. Greyscale Data Packet Format
When pin MODE is tied to GND, the AS1112 enters greyscale data input mode. The device switches the input shift register to 192-bit width. After
all data is clocked in, the rising edge of the LD signal latches the data into the greyscale register
All greyscale data in the input shift register is replaced with status information data (SID) after latching into the greyscale register.
www.austriamicrosystems.com/LED-Driver-ICs/AS1112
GS15.11
MSB
191
MODE
SDO
CLK
SDI
LD
GS OUT15
DCn-1
...
LSB
V
GND
DCn-1
CC
MSB
t
SU0
GS15.0
180
MSB
DCn
1
MSB-1
DCn-1
GS14.11
MSB-1
179
t
DCn
WH0
Dot Correction Mode
Data Input Cycle n
2
MSB-2
DCn-1
t
WL0
MSB-2
DCn
1
%Brightness =
GS OUT14:GS OUT1
DCn-1
LSB+1
(see Figure
Revision 1.09
LSB+1
DCn
...
95
DCn-1
4095
LSB
GSn
t
11).
SU1
96
x 100
DCn
LSB
(see Figure
MSB
DCn
Data Input Cycle n +1
t
GS1.0
Dot Correction Mode
WH2
12
t
H1
12).
GS0.11
11
DCn+1
MSB
1
GS OUT0
MSB-1
DCn
...
DCn+1
MSB-1
2
MSB-2
DCn
GS0.0
LSB
0
(EQ 4)
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