AS1108_1 AMSCO [austriamicrosystems AG], AS1108_1 Datasheet

AS1108_1

Manufacturer Part Number

AS1108_1

Description

4-Digit LED Display Driver

Manufacturer

AMSCO [austriamicrosystems AG]

Datasheet

1.AS1108_1.pdf (19 pages)

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A S 11 0 8

4 - D i g i t L E D D i s p l a y D r i v e r

1 General Description

The AS1108 is a compact display driver for 7-segment

numeric displays of up to 4 digits. The device can be

programmed via SPI, QSPI, and Microwire as well as a

conventional 4-wire serial interface.

The device includes an integrated BCD code-B/HEX

decoder, multiplex scan circuitry, segment and display

drivers, and a 32-bit memory. Internal memory stores

the LED settings, eliminating the need for continuous

device reprogramming.

Every segment can be individually addressed and

updated separately. Only one external resistor (R

required to set the current through the LED display. LED

brightness can be controlled by analog or digital means.

The device can be programmed to use the internal

code-B/HEX decoder to display numeric digits or to

directly address each segment.

The AS1108 features an extremely low shutdown cur-

rent of typically 3µA, and an operational current of less

than 500µA. The number of digits can be programmed,

the device can be reset by software, and an external

clock is also supported. Additionally, segment blinking

can be synchronized across multiple drivers.

The AS1108 provides several test modes for easy appli-

cation debugging.

The device is available in a 20-pin DIP and a 20-pin

SOIC package.

Figure 1. Typical Application Diagram

www.austriamicrosystems.com

processor

Micro-

9.53kΩ

SCK

I/O

LOAD/CSN

GND

CLK

DIN

SET

) is

Revision 2.11

AS1108

+5V

2 Key Features

3 Applications

The AS1108 is ideal for bar-graph displays, instrument-

panel meters, LED matrix displays, dot matrix displays,

set-top boxes, white goods, professional audio equip-

ment, medical equipment, industrial controllers and

panel meters.

GND

Serial I/O

across multiple drivers)

Digit Selection

data retained)

Open-Loop

- 20-pin DIP

- 20-pin SOIC

10MHz SPI-, QSPI-, Microwire-Compatible

Individual LED Segment Control

Segment Blinking Control (can be synchronized

Hexadecimal- or BCD-Code/No-Decode

3µA Low-Power Shutdown Current (typ;

Extremely Low Operating Current 0.5mA in

Digital and Analog Brightness Control

Display Blanked on Power-Up

Drive Common-Cathode LED Displays

Supply Voltage Range: +2.7 to +5.5V

Software Reset

Optional External Clock

Packages:

4-Digit Microprocessor Display

DIG0 to

DIG3

SEG A to G

SEP DP

8 Segments

4 Digits

D a t a S h e e t

1 - 19

Related parts for AS1108_1

AS1108_1 Summary of contents

Page 1

General Description The AS1108 is a compact display driver for 7-segment ...

Page 2

AS1108 Data Sheet - Pinout Pin Assignments Figure 2. DIP and SO Pin Assignments (Top View) Pin Descriptions Table 1. Pin Descriptions Pin Pin Name Number 1 DOUT 2 DIN ...

Page 3

AS1108 Data Sheet - Absolute Maximum Ratings Stresses beyond those listed in Table 2 may cause permanent ...

Page 4

AS1108 Data Sheet - Electrical Characteristics Conditions 2.7 to 5.5V ...

Page 5

AS1108 Data Sheet - Typical Operating Characteristics Ω V ...

Page 6

AS1108 Data Sheet - Figure 9. I vs. R SEG ...

Page 7

AS1108 Data Sheet - Detailed Description Serial-Addressing Format Programming the AS1108 is accomplished by writing to the device’s internal registers ...

Page 8

AS1108 Data Sheet - Shutdown Mode The AS1108 features a shutdown mode, consuming only 10µA (max) current. Shutdown mode is entered ...

Page 9

AS1108 Data Sheet - Shutdown Register (0xXC) The Shutdown Register controls AS1108 shutdown mode (see Shutdown Mode on page 8). Table ...

Page 10

AS1108 Data Sheet - Table 10. Code-B Font (Continued) 7-Segment † Character D7 D6: ...

Page 11

AS1108 Data Sheet - Intensity Control Register (0xXA) The brightness of the display can be controlled by digital means using the ...

Page 12

AS1108 Data Sheet - Feature Register (0xXE) The Feature Register is used for switching the device into external clock mode, applying ...

Page 13

AS1108 Data Sheet - Typical Application Supply Bypassing and Wiring In order to achieve optimal performance the AS1108 should be placed very ...

Page 14

AS1108 Data Sheet - Table 22. R vs. Segment Current and LED Forward Voltage, V SET I (mA) SEG 1.5 20 17.7kΩ 17.3kΩ ...

Page 15

AS1108 Data Sheet - 4x8 LED Dot Matrix Driver The application example in Figure 12 shows the AS1108 as a 4x8 LED dot ...

Page 16

AS1108 Data Sheet - Package Drawings and Markings The AS1108 is available in ...

Page 17

AS1108 Data Sheet - Figure 14. 20-pin SOIC Package Notes: 1. Lead coplanarity should ...

Page 18

AS1108 Data Sheet - Ordering Information The AS1108 is available in a 20-pin DIP and a 20-pin SOIC package. Table ...

AS1108 Data Sheet Copyrights Copyright © 1997-2007, 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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