AS1110
Constant-Current, 16-Channel LED Driver with Diagnostics
www.ams.com/LED-Driver-ICs/AS1110 Revision 1.6 1 - 24
1 General Description
The AS1110 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 100mA/channel) using an external
resistor (R
EXT).
The serial interface with Schmitt trigger inputs includes an integrated
shift register. Additionally, an internal data register stores the
currently 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 AS1110 also features a low-current diagnostic mode to minimize
display flicker during fault testing.
The AS1110 is available in a 24-pin SSOP and the 28-pin QFN
(5x5mm) package.
Figure 1. Main Diagram and Pin Assignments
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 100mA
Controlled In-rush current
Over-Temperature, Open-LED, Shorted-LED
Diagnostic functions
Low-current test mode
Global fault monitoring
Low shutdown mode current: 10µA
Fast serial interface: 50MHz
Cascaded configuration
Extremely fast output drivers suitable for PWM
24-pin SSOP and 28-pin QFN (5x5mm) 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
displays, mixed LED display and switch monitoring, displays in
elevators, 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 controller displays, white good panels, emergency light
indicators, and traffic signs.
AS1110
SDI SDO
CLK LD OEN REXT
+V
LED
OUTN3
OUTN4
OUTN5
OUTN6
OUTN7
OUTN8
OUTN9
OUTN10
GND
VDD
OUTN0
OUTN1
OUTN2
OUTN11
OUTN12
OUTN13
OUTN14
OUTN15
