AS1112B AMSCO [austriamicrosystems AG], AS1112B Datasheet

AS1112B

Manufacturer Part Number

AS1112B

Description

16-Channel LED Driver with Dot Correction and Greyscale PWM

Manufacturer

AMSCO [austriamicrosystems AG]

Datasheet

1.AS1112B.pdf (18 pages)

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AS1112

1 6 - C h a n n e l L E D D r i v e r w i t h D o t C o r r e c t i o n a n d

G r e y s c a l e P W M

1 General Description

The AS1112 is a 16-channel, constant current-sink LED

driver. Each of the 16 channels can be individually

adjusted by 4096-step greyscale PWM brightness con-

trol and 64-step constant-current sink (dot correction).

The dot correction circuitry adjusts the brightness varia-

tions between the AS1112 channels and other LED driv-

ers. Greyscale control and dot correction circuitry are

accessible via the SPI-compatible serial interface. A sin-

gle external resistor sets the maximum current value of

all 16 channels.

The open & short LED detection function indicates a

broken, shorted or disconnected LED at one or more of

the outputs. The overtemperature flag indicates that the

device is in an overtemperature condition.

Table 1. Standard Products

An additional power-down pin puts the AS1112 into a

40nA standby-mode.

The AS1112 is available in a 32-pin TQFN 5x5 mm

package.

Figure 1. Block Diagram

www.austriamicrosystems.com

GSCLK

XERR

MODE

AS1112B

OEN

GND

AS1112

Model

REF

Open LED Detect,

Overtemperature

Max OUTn

Correction Data

Greyscale

Thermal

Counter

Current

Flag

Flag, Dot

Status

Power-Down

Detect

Open

LED

Yes

AS1112

Control

1.24V

REF

1 CLK

Connect to GND

Connect to V

2 SDI

Input

Shift

Input

Shift

TEST pin

32 LD

Revision 1.06

12 Register 23

180 Register191

Dot Correction

Greyscale

2 Key Features

3 Applications

The device is ideal for mono-, multi-, and full-color LED

displays, LED signboards, and display backlights.

- LED Open/Short Detection

- Overtemperature Flag

16 Channels

Dot Correction: 6-Bit (64 Steps)

Drive Capability (Constant-Current Sink): 0 to 80mA

LED Power Supply Voltage: Up to 15V

Supply Voltage Range: 3.0 to 5.5 V

SPI-Compatible Serial Interface

Controlled In-Rush Current

Data Transfer & PWM Clock Rate: up to 30 MHz

CMOS Level I/O

Diagnostic Features

32-pin TQFN 5x5 mm Package

Greyscale PWM Control: 12-Bit (4096 Steps)

Open&Short LED Detection

29 PD

12-Bit Greyscale

PWM Control

Correction

6-Bit Dot

Control

Constant Current

Delay

x15

Driver

D a ta s h e e t

OUT0

OUT1

OUT15

SDO

1 - 18

Related parts for AS1112B

AS1112B Summary of contents

Page 1

... The overtemperature flag indicates that the device overtemperature condition. Table 1. Standard Products Model Power-Down TEST pin AS1112 Yes Connect to GND AS1112B No Connect additional power-down pin puts the AS1112 into a 40nA standby-mode. The AS1112 is available in a 32-pin TQFN 5x5 mm package. Figure 1. Block Diagram 1 CLK ...

Page 2

... OUT12 OUT3 7 17 OUT11 OUT4 8 Description (see Setting Greyscale Brightness on page : Selects dot correction mode (see Setting Dot Correction on page CC (AS1112B) to ensure normal operation the dot correction register receives new data. CC Revision 1.06 24 GSCLK 23 SDO 22 XERR 21 OUT15 Thermal 20 OUT14 Pad 19 OUT13 ...

Page 3

AS1112 Datasheet - Absolute Maximum Ratings Stresses beyond those listed in Table 3 and functional operation of ...

Page 4

AS1112 Datasheet - Recommended Operating Conditions Table 4. DC ...

Page 5

AS1112 Datasheet - Electrical Characteristics V = +3.0 to +5.5V -40 to ...

Page 6

AS1112 Datasheet - Switching Characteristics V = +3.0 to +5.5V -40 to +85ºC. ...

Page 7

AS1112 Datasheet - Typical Operating Characteristics V = 5V, ...

Page 8

AS1112 Datasheet - Detailed Description Serial Interface The AS1112 features a versatile 3-pin (CLK, SDI, and SDO) serial interface, which ...

Page 9

AS1112 Datasheet - Table 9. XERR Truth Table Error Condition Thermal Temp. OUTn Voltage Error Flag OUTn > V LOD T ...

Page 10

AS1112 Datasheet - Figure 8. Error Detection Timing (GS=FFFF LD OEN GSCLK SID Note: The rising edge of LD latches new ...

Page 11

AS1112 Datasheet - Power Dissipation To ensure proper operation of the device, the total power dissipation of the AS1112 must be ...

Page 12

AS1112 Datasheet - Figure 10. Dot Correction Data Input Timing Diagram Dot Correction Mode Data Input Cycle MODE ...

Page 13

AS1112 Datasheet - Figure 12. Greyscale Data Input Timing Diagram Dot Correction Mode Data Input Cycle Data Input Cycle After Dot ...

Page 14

AS1112 Datasheet - Figure 14. Greyscale PWM Cycle Timing Diagram OEN GSCLK t PD1 OUT0 Current t PD1 OUT1 Current t ...

Page 15

AS1112 Datasheet - Serial Data Transfer Rate Figure 15 shows a cascaded arrangement AS1112 devices connected to a controller, building a ...

Page 16

AS1112 Datasheet - Package Drawings and Markings The device is available in an ...

Page 17

... AS1112-BQFT 16-Channel LED Driver with Dot Correction and Greyscale PWM with Active-High TEST Input and Power-Down Mode AS1112B-BQFT 16-Channel LED Driver with Dot Correction and Greyscale PWM with Active-Low XTEST Input and without Power-Down Mode All devices are RoHS compliant and free of halogene substances. ...

Page 18

AS1112 Datasheet 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, translated, stored, or used without the prior written consent of the copyright ...

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