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austriamicrosystems AG

AS1123 Datasheet Preview

AS1123 Datasheet

16 -Channel LED Driver

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Datasheet
AS1123
Constant-Current, 16-Channel LED Driver with Diagnostics
1 General Description
The AS1123 is designed to drive up to 16 LEDs through a fast serial
interface and features 16 output constant current drivers and an on-
chip diagnostic read-back function.
The high clock-frequency (up to 50MHz), adjustable output current,
and flexible serial interface makes the device perfectly suited for
high-volume transmission applications.
Output current is adjustable (up to 40mA/channel) using an external
resistor (REXT).
The serial interface with Schmitt trigger inputs includes an integrated
shift register. Additionally, an internal data register stores the cur-
rently displayed data.
The device features integrated diagnostics for over-
temperature, open-LED, and shorted-LED conditions. Integrated
registers store global fault status information during load as well as
the detailed temperature/open-LED/shorted-LED diagnostics results.
The AS1123 also features a low-current diagnostic mode to minimize
display flicker during fault testing.
The AS1123 is available in a 24-pin QSOP and a 24-pin TQFN
(4x4mm) package.
Figure 1. AS1123 - Typical Application Diagram
2 Key Features
16 Constant-Current Output Channels
Excellent Output Current Accuracy
- Between Channels: <±3%
- Between Devices: <±3%
Output Current Per Channel: 0.5mA to 40mA
Over-Temperature, Open-LED, Shorted-LED
Diagnostic Functions
Low-Current Test Mode
Global Fault Monitoring
Fast Serial Interface: 50MHz
Cascaded Configuration
Extremely Fast Output Drivers Suitable for PWM
Output Delay for controlling Inrush Current (on request)
24-pin QSOP and 24-pin TQFN (4x4mm) Package
3 Applications
The device is ideal for fixed- or slow-rolling displays using static or
multiplexed LED matrix and dimming functions, large LED matrix dis-
plays, mixed LED display and switch monitoring, displays in eleva-
tors, public transports (underground, trains, buses, taxis, airplanes,
etc.), large displays in stadiums and public areas, price indicators in
retail stores, promotional panels, bar-graph displays, industrial con-
troller displays, white good panels, emergency light indicators, and
traffic signs.
+VLED
AS1123
SDI
CLK
LD
OEN
REXT
GND
VDD
SDO
www.austriamicrosystems.com/LED-Driver-ICs
Revision 1.00
1 - 24




austriamicrosystems AG

AS1123 Datasheet Preview

AS1123 Datasheet

16 -Channel LED Driver

No Preview Available !

AS1123
Datasheet - Pinout
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
24 23 22 21 20 19
OUTN11 1
18 OUTN4
OUTN12 2
OUTN13 3
OUTN14 4
AS1123
24-pin TQFN
(4x4mm)
17 OUTN3
16 OUTN2
15 OUTN1
OUTN15 5
OEN 6
Exposed
Pad
14 OUTN0
13 LD
7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
AS1123
24-pin QSOP
1 2 3 4 5 6 7 8 9 10 11 12
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
QSOP TQFN
1 10
2 11
Pin Name
GND
SDI
3 12
CLK
4 13
LD
5:20 1:5, 14:24 OUTN0:15
21 6
OEN
22 7
SDO
23 8
24 9
-
Exposed
Pad
REXT
VDD
Description
Ground
Serial Data Input
Serial Data Clock. The rising edge of the CLK signal is used to clock data into and out of the
AS1123 shift register. In error mode, the rising edge of the CLK signal is used to switch error
modes.
Serial Data Load. Pull-down Resistor
Output Current Drivers. These pins are used as LED drivers or for input sense for diagnostic
modes. Data is transferred to the data register at the rising edge of these pins.
Output Enable. Pull-up Resistor. The active-low pin OEN signal can always enable output drivers
to sink current independent of the AS1123 mode.
0 = Output drivers are enabled.
1 = Output drivers are disabled.
Serial Data Output. In normal mode SDO is latched out 8.5 clock cycles after SDI is latched in.
In global error detection mode this pin indicates the occurrence of a global error.
0 = Global error mode returned an error.
1 = No errors.
External Resistor Connection. This pin connects through the external resistor (REXT) to GND, to
setup the load current.
Positive Supply Voltage
Exposed Pad. This pin also functions as a heat sink. Solder it to a large pad or to the circuit-board
ground plane to maximize power dissipation.
www.austriamicrosystems.com/LED-Driver-ICs
Revision 1.00
2 - 24


Part Number AS1123
Description 16 -Channel LED Driver
Maker austriamicrosystems AG
Total Page 24 Pages
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