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austriamicrosystems AG

AS1121 Datasheet Preview

AS1121 Datasheet

16-Channel LED Driver

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Datasheet
AS1121
16-Channel LED Driver with Dot Correction and Greyscale PWM
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
Figure 1. AS1121 - Block Diagram
The device is ideal for mono-, multi-, and full-color LED displays,
LED signboards, and display backlights.
1 CLK 2 SDI
32 LD
29 PD
26
IREF
24
GSCLK
31
OEN
3
MODE
27
VCC
Max OUTn VREF =
Current 1.24V
Greyscale
Counter
Control
Status
Open LED Detect,
Overtemperature,
Dot Correction
Data
Over-
temp
Open
LED
Detect
22
XERR
30
GND
AS1121
Input
Shift
Register
Input
Shift
Register
Control
Greyscale
0 Register 11
12-Bit Greyscale
PWM Control
Dot Correction
0 Register 5
6-Bit Dot
Correction
Open&Short LED Detection
Control
Greyscale
12 Register 23
12-Bit Greyscale
PWM Control
Dot Correction
6-Bit Dot
6 Register 11
Correction
. Open&Short LED Detection
.
. Control
Greyscale
180 Register191
12-Bit Greyscale
PWM Control
Dot Correction
90 Register 95
6-Bit Dot
Correction
Open&Short LED Detection
Constant Current
Driver
Delay
Constant Current
Driver
Delay
Constant Current
Driver
Delay
4
OUT0
5
OUT1
.
.
.
21
OUT15
23
SDO
www.austriamicrosystems.com/AS1121
Revision 1.01
1 - 21




austriamicrosystems AG

AS1121 Datasheet Preview

AS1121 Datasheet

16-Channel LED Driver

No Preview Available !

AS1121
Datasheet - Pinout
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
CLK
SDI
MODE
OUT0
OUT1
OUT2
OUT3
OUT4
1
2
3
4
5
6
7
8
AS1121
Thermal
Pad
33
24 GSCLK
23 SDO
22 XERR
21 OUT15
20 OUT14
19 OUT13
18 OUT12
17 OUT11
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
2
Pin Name
CLK
SDI
3 MODE
4:11
14:21
OUT0:OUT7
OUT8:OUT15
22 XERR
23
24
26
25, 27
12,13,28
SDO
GSCLK
IREF
VCC
N/C
29 PD
30 GND
31 OEN
32 LD
33 Thermal Pad
Description
Serial Data Shift Clock
Serial Data Input
Mode Select input with internal pulldown
MODE = GND: Selects greyscale mode (see Setting Greyscale Brightness on page 14)
MODE = VCC: Selects dor correction mode (see Setting Dot Correction on page 13)
Constant-Current Outputs 0:7
Constant-Current Outputs 8:15
Error Output
0 = LED open detection or overtemperature condition is detected.
1 = Normal operation.
Serial Data Output
Greyscale Clock. Reference clock for greyscale PWM control
Reference Current Terminal
Power Supply Voltage
This pins must not be connected
Power Down
0 = normal operation mode
1 = power down mode
Ground
Blank Outputs
0 = OUTn outputs are controlled by the greyscale PWM control.
1 = OUTn outputs are forced off; the greyscale counter is reset.
Data Latch. The internal connections are switched by pin MODE.
For LD (MODE = GND), the greyscale register receives new data.
For LD (MODE = VCC), the dot correction register receives new data.
Thermal Pad. This pin must be connected to GND to ensure normal operation.
www.austriamicrosystems.com/AS1121
Revision 1.01
2 - 21


Part Number AS1121
Description 16-Channel LED Driver
Maker austriamicrosystems AG
Total Page 21 Pages
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