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Data sheet
A S 112 1
16-C han ne l LED D river with D o t C o r r e c t i o n a n d G r e y s c a l e P W M
1 General Description
The AS1121 is a 16-channel, constant current-sink LED driver. Each
of the 16 channels can be individually adjusted by 4096-step grey-
scale PWM brightness control and 64-step constant-current sink (dot
correction).
The dot correction circuitry adjusts the brightness variations between
the AS1121 channels and other LED drivers. Greyscale control and
dot correction circuitry are accessible via the SPI-compatible serial
interface. A single external resistor sets the maximum current value
of all 16 channels.
The open LED detection function indicates a broken or disconnected
LED at one or more of the outputs. The overtemperature protection-
flag indicates that the device is in an overtemperature condition.
An additional power-down pin puts the AS1121 into a 40nA standby-
mode.
The AS1121 is available in a 32-pin TQFN 5x5 mm package.
2 Key Features
Greyscale PWM Control: 12-Bit (4096 Steps)
Dot Correction: 6-Bit (64 Steps)
Drive Capability (Constant-Current Sink): 0 to 40mA
LED Power Supply Voltage: up to 30V
Supply Voltage Range: 3.1V to 3.6V
SPI-Compatible Serial Interface
Output Delay for controlled Inrush Current (factory set, can be
turned off)
Factory set rise- and fall-time for EMI improvement
PWM Clock Rate: up to 10 MHz
Data Transfer Clock Rate: up to 30 MHz
CMOS Level I/O
Diagnostic Features
32-pin TQFN 5x5 mm Package
3 Applications
The device is ideal for mono-, multi-, and full-color LED displays,
LED signboards, and display backlights.
Figure 1. AS1121 - Block Diagram
1 CLK
2 SDI
32 LD
29 PD
26
IREF
24
GSCLK
31
OEN
Max OUT n
Current
Greyscale
Counter
V REF =
1.24V
Control
Input
Shift
Register
Control
Greyscale
12-Bit Greyscale
0 Register 11
PWM Control
Dot Correction 6-Bit Dot
0 Register 5 Correction
Open&Short LED Detection
Constant Current
Driver
Delay
4
OUT0
Status
Open LED Detect,
Control
Constant Current
Driver
5
Overtemperature,
Dot Correction
Greyscale
12 Register 23
12-Bit Greyscale
PWM Control
Delay
OUT1
.
3
MODE
27
VCC
Data
Over-
temp
Open
LED
Detect
Input
Dot Correction 6-Bit Dot
6 Register 11 Correction
. Open&Short LED Detection
.
Control
Constant Current
Driver
21
.
.
.
22
Shift
Register
Greyscale
180 Register191
Dot Correction
90 Register 95
12-Bit Greyscale
PWM Control
6-Bit Dot
Correction
Delay
OUT15
XERR
30
GND
AS1121
Open&Short LED Detection
23
SDO
www.austriamicrosystems.com/AS1121
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