AS2590P AMSCO [austriamicrosystems AG], AS2590P Datasheet

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AS2590P

Manufacturer Part Number
AS2590P
Description
LC DISPLAY DRIVER WITH 18 DIGITS, 6 SYMBOLS AND CLOCK/TIMER
Manufacturer
AMSCO [austriamicrosystems AG]
Datasheet
Data Sheet
Austria Mikro Systeme International
Package
Available in 48 pin DIP and 52 pin PLCC.
Rev. 1
Key Features
33 LCD segment outputs and 4 LCD backplane
4 times multiplex mode with a cycle time of 128 Hz
Very low operating current, typ. 30 A @ 3V
Low power oscillator using 32.768 kHz Xtal
2-wire interface compatible to AS2574B
18 digits by 7 segments
6 symbols
24 hour clock showing hours and minutes
Mode select pin for selecting clock function
Timer automatically showing elapsed time in
minutes and seconds after each telephone
conversation
outputs
KEYBOARD
AS2574A/B
CONTROLLER
DIALLER
V
Vss
DD
LC DISPLAY DRIVER WITH 18 DIGITS,
6 SYMBOLS AND CLOCK/TIMER
1
General Description
The AS2590 is an integrated CMOS device for driving a
liquid crystal display intended for use in telephones. The
2-wire serial interface is compatible to the dialler
AS2574B.
The extreme low operating current allows the circuit to
be operational also during on-hook which is necessary
in order to the use of the clock function. In on-hook
condition the circuit can be supplied by a small leakage
current from the telephone line or from a small 3V
battery.
Whether the oscillator shall continue operating or be
stopped during on-hook is determined by the mode pin,
MS.
SPEECH CIRCUIT
V23
V13
V
SDA
SCL
LCD
V
DD
BIAS
Vss
MS
X1
X2
32.768kHz
AS2590
Dec. 1993

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AS2590P Summary of contents

Page 1

Data Sheet Austria Mikro Systeme International Key Features Very low operating current, typ Low power oscillator using 32.768 kHz Xtal 2-wire interface compatible to AS2574B 18 digits by 7 segments 6 symbols 24 hour clock showing ...

Page 2

Data Sheet Pin Description DIL PLCC Symbol 1 1 BP1 2 2 BP0 ...

Page 3

Data Sheet Pin Description Continued DIL PLCC Symbol 42 45 SDA 43 47 SCL XTAL1 46 50 XTAL2 LCD Layout SB3 SB0 = ...

Page 4

Data Sheet Description Operating Modes The following two operating modes are pin selectable: Mode 0: Clock and timer are disabled and the oscillator is stopped when going on-hook (command BLANK ALL). Mode 1: Clock and timer functions are enabled, clock ...

Page 5

Data Sheet NO MNEMONIC 1 SET LS 2 CLEAR LS 3 SET MUTE 4 CLEAR MUTE 5 SET 2ND 6 CLEAR 2ND 7 SET CLOCK 8 START 9 START COPY 10 START FIFO 11 START TIMER 12 BLANK ALL 13 ...

Page 6

Data Sheet Active Backplane BP0 BP1 BP2 BP0 BP1 BP2 BP3 S0 on off off S1 off on on Figure 3 LCD driver outputs Serial Interface The serial interface is a one way, two line link between the dialler (AS2574) ...

Page 7

Data Sheet Electrical Characteristics Absolute Maximum Ratings Positive Supply Voltage ...................................................................................................................-0.3V Input Current ................................................................................................................................................ 25 mA Digital Input Voltage .....................................................................................................V Electrostatic Discharge (HBM) ........................................................................................................................ 500V Storage Temperature ......................................................................................................................- +125 C Recommended Operating Conditions Supply Voltage ..............................................................................................................................2.5V Oscillator Frequency ...

Page 8

Data Sheet AC Characteristics (V = 3.0V Symbol Parameter SDA/SCL Serial Interface f Clock Frequency CL f Clock High Time CLH f Clock Low Time CLL f Clock Low to Data Change CD f Stop Bit High Time ...

Page 9

Data Sheet Timing Diagrammes t HSA SDA SCL START SDA t CLL SCL BIT 4 Rev CLL BIT SUSO SOH STOP Figure 5 Serial Interface timing waveforms CLH BIT ...

Page 10

Data Sheet Output Waveforms t BRON Vss t SFON Vss Rev BFON Figure 6 Backplane timing waveforms ...

Page 11

Data Sheet Pin Configurations 48 Pin DIP BP1 1 BP0 V1/3 13 S10 14 S11 15 S12 16 S13 ...

Page 12

Data Sheet Devices sold by Austria Mikro Systeme are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Austria Mikro Systeme makes no warranty, express, statutory, implied description regarding the information set forth ...

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