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A S111 2
1 6- C h a n n e l L E D D ri v er w it h D o t Co rr e c ti o n a n d G r ey s c a le P W M
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 control and 64-step constant-current sink
(dot correction).
The dot correction circuitry adjusts the brightness variations between
the AS1112 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 & short LED detection function indicates a broken, shorted
or disconnected LED at one or more of the outputs. The overtemper-
ature flag indicates that the device is in an overtemperature condi-
tion.
Table 1. Standard Products
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 100mA
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
Model
AS1112
AS1112B
AS1112C
Power-Down
Yes
No
No
TEST pin
Connect to GND
Connect to V CC
Connect to V CC
Output Delay
Yes
Yes
No
Diagnostic Features
- LED Open/Short Detection
- Overtemperature Flag
32-pin TQFN 5x5 mm Package
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.
3 Applications
The device is ideal for mono-, multi-, and full-color LED displays,
LED signboards, and display backlights.
Figure 1. AS1112 - Block Diagram
1 CLK
2 SDI
32 LD
29 PD
26
IREF
24
Max OUT n
Current
V REF =
1.24V
Greyscale
0 Register 11
Control
12-Bit Greyscale
PWM Control
Constant Current
Driver
Delay*
x0
4
OUT0
GSCLK
31
OEN
Greyscale
Counter
Control
Input
Shift
Register
0
Dot Correction 6-Bit Dot
Register 5 Correction
Open&Short LED Detection
Status
Open LED Detect,
Control
Constant Current
Driver
5
Overtemperature
Flag, Dot
Greyscale
12 Register 23
12-Bit Greyscale
PWM Control
Delay*
x1
OUT1
Thermal
Flag
.
3
MODE
27
VCC
Correction Data
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*
x15
OUT15
XERR
30
GND
AS1112
Open&Short LED Detection
23
SDO
* not for AS1112C
www.austriamicrosystems.com/LED-Driver-ICs/AS1112
Revision 1.13
1 - 19
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