AS1109_1 AMSCO [austriamicrosystems AG], AS1109_1 Datasheet

AS1109_1

Manufacturer Part Number

AS1109_1

Description

Constant-Current, 8-Bit LED Driver with Diagnostics

Manufacturer

AMSCO [austriamicrosystems AG]

Datasheet

1.AS1109_1.pdf (26 pages)

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A S 11 0 9

C o n s ta n t - C u r r e n t , 8 - B i t L E D D r i v e r w i t h D i a g n o s t i c s

1 General Description

The AS1109 is designed to drive up to 8 LEDs through a

fast serial interface and features 8 output constant cur-

rent drivers and an on-chip diagnostic read-back func-

tion.

The high clock-frequency (up to 50MHz), adjustable out-

put 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

The serial interface with Schmitt trigger inputs includes

an integrated shift register. Additionally, an internal 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 AS1109 also features a low-current diagnostic

mode to minimize display flicker during fault testing.

With an operating temperature range from -40 to

+125°C the AS1109 is also ideal for industrial applica-

tions.

The AS1109 is available in a 16-pin SOIC-150, a 16-pin

QFN (4x4mm) and the 16-pin SSOP-150 package.

Figure 1. Main Diagram and Pin Assignments

www.austriamicrosystems.com

LED

SDI

OUTN0 OUTN1 OUTN2 OUTN3 OUTN4 OUTN5 OUTN6 OUTN7

CLK

EXT

AS1109

OEN

REXT

Revision 1.18

GND

2 Key Features

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 pan-

els, emergency light indicators, and traffic signs.

- Between Channels: ±2%

- Between AS1109 Devices: ±2%

8 Constant-Current Output Channels

Excellent Output Current Accuracy

Output Current Per Channel: 0.5 to 100mA

Controlled In-Rush Current

Over-Temperature, Open-LED, Shorted-LED

Diagnostics Functions

Low-Current Test Mode

Global Fault Monitoring

Low Shutdown Mode Current: 3µA

Fast Serial Interface: up to 50MHz

Cascaded Configuration

Fast Output Drivers Suitable for PWM

16-pin SOIC-150, 16-pin QFN (4x4mm) and 16-pin

SSOP-150 Package

SDO

OUTN0

OUTN1

OUTN2

OUTN3

GND

CLK

SDI

AS1109

15 REXT

14 SDO

13 OEN

12 OUTN7

11 OUTN6

10 OUTN5

9 OUTN4

D a t a S h e e t

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Related parts for AS1109_1

AS1109_1 Summary of contents

AS1109 Data Sheet Contents 1 General Description ............................................................................................................................. 1 2 Key Features ........................................................................................................................................ 1 3 Applications .......................................................................................................................................... 1 4 Pinout ................................................................................................................................................... 3 Pin Assignments ................................................................................................................................................. 3 Pin Descriptions ................................................................................................................................................... 3 5 Absolute Maximum Ratings ................................................................................................................. 4 6 Electrical Characteristics ...................................................................................................................... ...

Page 3

AS1109 Data Sheet - Pinout Pin Assignments Figure 2. Pin Assignments (Top View) GND 1 SDI 2 CLK AS1109 OUTN0 5 OUTN1 6 OUTN2 7 OUTN3 8 16-pin SSOP-150 16-pin ...

Page 4

AS1109 Data Sheet - Absolute Maximum Ratings Stresses beyond those listed in Table 2 and functional operation ...

Page 5

AS1109 Data Sheet - Electrical Characteristics V = +3.0 to +5.5V -40 ...

Page 6

AS1109 Data Sheet - Table 3. Electrical Characteristics (Continued) Symbol Parameter I DD(OFF)0 I DD(OFF)1 ...

Page 7

AS1109 Data Sheet - Typical Operating Characteristics Figure 3. ...

Page 8

AS1109 Data Sheet - Detailed Description The AS1109 is designed to drive LEDs through a fast serial ...

Page 9

AS1109 Data Sheet - Serial Interface Data accesses are made serially via pins SDI and SDO. At each CLK rising edge, ...

Page 10

AS1109 Data Sheet - Figure 12. Data Input Timing Diagram OEN LD CLK Data Bit Data Bit Data Bit SDI0 7 ...

Page 11

AS1109 Data Sheet - Figure 14. Switching Global Error Mode Timing Diagram t TESTING OEN t GSW(ERROR SU(ERROR) CLK ...

Page 12

AS1109 Data Sheet - there are multiple AS1109s in a chain, the error flag will be gated through all devices. ...

Page 13

AS1109 Data Sheet - Detailed Error Reports The detailed error report can be read out after global error mode has been ...

Page 14

AS1109 Data Sheet - Detailed Open-LED Error Report The detailed open-LED error report can be read out immediately after global error ...

Page 15

AS1109 Data Sheet - Detailed Shorted-LED Error Report The detailed shorted-LED error report can be read out immediately after global error ...

Page 16

AS1109 Data Sheet - Figure 18. Switching into Low-Current Diagnostic Mode Timing Diagram OEN LD CLK t GSW(ERROR) SDI SDO For ...

Page 17

AS1109 Data Sheet - Application Information Error Detection The AS1109 features two types of error detection. The ...

Page 18

AS1109 Data Sheet - Low-current diagnosis mode is started with 3 clock pulses during error detection mode. After ...

Page 19

AS1109 Data Sheet - Constant Current In LED display applications, the AS1109 provides virtually no current variations from ...

Page 20

AS1109 Data Sheet - Figure 24. Voltage Reducer using Resistor (Left) and Zener Diode (Right) Voltage Supply } ...

Page 21

AS1109 Data Sheet - Package Drawings and Markings The device is available in ...

Page 22

AS1109 Data Sheet - Figure 26. 16-pin SSOP-150 Package Symbol Min Max A 1.35 ...

Page 23

AS1109 Data Sheet - Figure 27. 16-pin QFN 4x4mm Packages D D/2 Index Area ...

Page 24

AS1109 Data Sheet - Notes: 1. Dimensioning and tolerancing conform to ASME Y14.5M-1994. 2. ...

Page 25

AS1109 Data Sheet - Ordering Information The device is available as the standard products shown in Table 9. Ordering Information ...

Page 26

AS1109 Data Sheet Copyrights Copyright © 1997-2009, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, trans- lated, stored, or used without the prior written consent of ...

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