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

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

GND