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AS2591 Datasheet

  • AS2591

  • 16-Digit LCD Driver CMOS Integrated Circuit

  • 76.32KB

  • 10頁

  • AMSCO

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Preliminary
AS2591
16-Digit LCD Driver
CMOS Integrated Circuit
Austria Mikro Systeme International AG
Key Features
q
16-digit LCD driver on a 44 pin CMOS chip
q
Operating voltage range: 3.2 to 4.8V
q
Low power consumption: max. 150 碌A
q
Driving 7-segment displays with up to 16 digits and
12 symbols
q
Option for 12 digits
q
Buffer for 32 digits
q
4 backplanes
q
2-wire interface
q
On chip timer for showing elapsed time
q
Contrast adjustable
q
On chip oscillator using 32.768 kHz crystal
q
Compatible with AS2525
General Description
The AS2591 is a CMOS integrated circuit for driving a
liquid crystal display intended for use in telephones.
The driver can be used with 12- or 16-digit LCDs.
The 2-wire serial interface is compatible with the
AS2525, single-chip handsfree telephone circuit.
The device is designed for LCDs with 4 backplanes
and 24 or 31 segments providing 12 or 16 7-segment
digits and 12 symbols.
The AS2591 also includes a timer for showing
elapsed time in minutes and seconds.
The contrast can be adjusted through the serial
interface.
Package
Available in 44 pin TQFP.
Block Diagramme
V
DD
POR
DI
SCLK
CS
DATA
BACKPLANE
COUNTER
4
COM1-4
SERIAL
I/F
7-
SEGMENT
DECODER
SEGMENT
MULTIPLEXER
DIGIT
MEMORY
32 DIGITS
16
S1_n
LCD
COMMAND
ADDRESS
DECODER
CONTROL
16
S2_n
32.768 kHz
OSC
ELAPSE
TIME
COUNTER
TIMER
V
LCD
CONTRAST
VOLTAGE
CONTROL
AS2591
Figure 1: Block diagram
Rev. 1.0
Page 1
May 1999

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