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AS1122 Datasheet Preview

AS1122 Datasheet

12-Channel LED Driver

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Datasheet
AS1122
12-Channel LED Driver with Dot Correction and Greyscale PWM
1 General Description
The AS1122 is a 12-channel, constant current-sink LED driver. Each
of the 12 channels can be individually adjusted by 4096-step
greyscale PWM brightness control and 64-step constant-current sink
(dot correction).
The dot correction circuitry adjusts the brightness variations between
the AS1122 channels and other LED drivers. Greyscale control and
dot correction circuitry are accessible via a simple SPI-compatible
serial interface.
The open LED detection function indicates a broken or disconnected
LED at one or more of the outputs. The overtemperature flag indi-
cates that the device is in an overtemperature condition.
A single external resistor sets the maximum current value of all 12
channels.
The AS1122 is available in a 24-pin QFN 4x4mm 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: 2.7V to 3.6V
Output Delay for controlled Inrush Current (factory set, can be
turned off)
Factory set rise- and fall-time for EMI improvement
Internal PWM Clock: 10 MHz (typ)
Data Transfer Clock Rate: up to 5 MHz
CMOS Level I/O
Diagnostic Features
24-pin QFN 4x4mm Package
3 Applications
The device is ideal for mono-, multi-, and full-color LED displays,
LED signboards, and display backlights.
Figure 1. AS1122 - Typical Application Diagram
www.austriamicrosystems.com/LED-Driver-ICs
Revision 1.00
1 - 22




austriamicrosystems AG

AS1122 Datasheet Preview

AS1122 Datasheet

12-Channel LED Driver

No Preview Available !

AS1122
Datasheet - Pinout
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
2
5
6
7:12, 19:24
13
14
15
16
18
3, 4, 17
25
Pin Name
SDI
CLKI
CLKO
SDO
OUT0:OUT11
VDD
IRQ
RST
IREF
GND
NC
Thermal Pad
Description
Serial Data Input
Serial Data Clock Input
Serial Data Clock Output
Serial Data Output
Constant-Current Outputs 0:11
Power Supply Voltage
Interrupt Request Output. Open drain pin, can be left open if not used.
Reset Input. Pull this pin to high to reset all registers (set to default values) and to put the device into
shutdown. Connect this pin to GND for normal operation.
Reference Current Terminal. A resistor connected to this pin sets the maximum output currents (see
Setting Maximum Channel Current on page 15).
Ground
Not Connected. Connect to GND if not used.
Ground. This pin must be connected to GND to ensure normal operation.
www.austriamicrosystems.com/LED-Driver-ICs
Revision 1.00
2 - 22


Part Number AS1122
Description 12-Channel LED Driver
Maker austriamicrosystems AG
Total Page 22 Pages
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