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AS1112 Datasheet(PDF) 1 Page - ams AG

Part No. AS1112
Description  16-Channel LED Driver with Dot Correction and Greyscale PWM
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Maker  AMSCO [ams AG]
Homepage  http://www.ams.com
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AS1112 Datasheet(HTML) 1 Page - ams AG

   
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AS1112
16-Channel LED Driver with Dot Correction and
Greyscale PWM
Produ ct Brief
www.austriamicrosystems.com
Revision 1.01
1 - 2
1 General Description
The AS1112 is a 16-channel, constant current-sink LED
driver. Each of the 16 channels can be individually
adjusted by 4096-step greyscale PWM brightness con-
trol and 64-step constant-current sink (dot correction).
The dot correction circuitry adjusts the brightness varia-
tions between the AS1112 channels and other LED driv-
ers. Greyscale control and dot correction circuitry are
accessible via the SPI-compatible serial interface. A sin-
gle external resistor sets the maximum current value of
all 16 channels.
The device features two error detection functions. The
open & short LED detection function indicates a broken,
shorted or disconnected LED at one or more of the out-
puts. The overtemperature flag indicates that the device
is in an overtemperature condition.
An additional power-down pin puts the AS1112 into a
40nA standby-mode.
The AS1112 is available in a 32-pin TQFN 5x5 mm
package.
Figure 1. Block Diagram
2 Key Features
!
16 Channels
!
Greyscale PWM Control: 12-Bit (4096 Steps)
!
Dot Correction: 6-Bit (64 Steps)
!
Drive Capability (Constant-Current Sink): 0 to 80mA
!
LED Power Supply Voltage: Up to 15V
!
Supply Voltage Range: 3.0 to 5.5 V
!
SPI-Compatible Serial Interface
!
Controlled In-Rush Current
!
Data Transfer & PWM Clock Rate: up to 30 MHz
!
CMOS Level I/O
!
Diagnostic Features
- LED Open/Short Detection
- Overtemperature Flag
!
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.
AS1112
Max OUTn
Current
27
VCC
Status
Open LED Detect,
Overtemperature
Flag, Dot
Correction Data
Thermal
Flag
22
XERR
Open
LED
Detect
26
IREF
24
GSCLK
31
OEN
30
GND
23
SDO
.
.
.
Control
12-Bit Greyscale
PWM Control
Constant Current
Driver
Delay
x15
21
OUT15
6-Bit Dot
Correction
Dot Correction
90
Register 95
Greyscale
180 Register191
Control
12-Bit Greyscale
PWM Control
Constant Current
Driver
Delay
x0
Open&Short LED Detection
4
OUT0
6-Bit Dot
Correction
Dot Correction
0
Register
5
Greyscale
0
Register 11
Control
12-Bit Greyscale
PWM Control
Constant Current
Driver
Delay
x1
5
OUT1
6-Bit Dot
Correction
Dot Correction
6
Register
11
Greyscale
12 Register 23
.
.
.
32 LD
Input
Shift
Register
Input
Shift
Register
2 SDI
1 CLK
Greyscale
Counter
Control
VREF =
1.24V
29 PD
3
MODE
Open&Short LED Detection
Open&Short LED Detection


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