EM91220A datasheet, PDF - EEWORLD Datasheet

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EM91220A: DescriptionTONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE; File Size145KB，20 Pages; ManufacturerEMC [ELAN Microelectronics Corp]

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EM91220A Overview

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

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TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

EM91220 SERIES

GENERAL DESCRIPTION

The EM91220 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with

20-set memories . The EM91220 series provides necessary functions of telephone set for application in any

environment, such as Pulse dialing, Tone (DTMF) dialing, Handfree dialing, keying tone , mute and pulse

mute functions. Beside this, SDO (Serial Data Output) functions is provided in advance version that is designed

to drive LCD driver and voice synthesizer. In this application, the dialing numbers can be displayed on LCD

screen with EM32100 ( or EM32116 ).

FEATURES

• Tone/Pulse switchable.

•

Wide operating voltage from 2.0 V to 5.5 V.

•

Low operating current, 0.15 mA (Pulse) and 0.3 mA (Tone) typically.

• Adding resistor on keyboard scan pin that can select many telephone specifications, such as : Pulse rate,

M/B ratio, Flash time, Pause time, P-T wait time and keyboard type.

• SDO function supports LCD driver and voice synthesizer to indicate dialing numbers.

• Handfree function provides on-hook dialing and speakerphone application.

• 20-set three touch repertory memory, each one can store data up to 16 digits.

• A 32-digit LNB (last number) redial memory.

• A 32-digit SAVE redial memory.

• Keytone function provides rapidly keying recognition.

• Pulse mute function supports pulse dialing application.

• Using 3.579545 MHz crystal or ceramic resonator.

• Package forms: PDIP, skinny.

ORDERING INFORMATION

Versions list

VERSION

EM91220A

EM91220B

EM91220C

LNB

√

SAVE

√

SDO(LCD)

PMUTE

√

* This specification are subject to be changed without notice.

10.1.1997

EM91220 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

PIN DESCRIPTIONS

Symbol

ROW1~ROW4

Function

Keyboard scan pins of row group. In idle state (HKS is “High” and HFO is “Low”),

these pins stay “High impedance” level to prevent power consumption. Otherwise,

these pins switch to “High” level for detecting keyboard entry. These pins will output

600 Hz signal while keyboard is scanning.

Keyboard scan pins of column group. In idle state, these pins stay “High impedance”

level. Otherwise these pins switch to “Low” level for detecting keyboard entry. These

pins will output 600 Hz signal while keyboard is scanning.

The fourth column group pin of the keyboard that also provides the keytone output

. Normally, this pin stays “Low” level for detecting keyboard entry. After a valid

keyboard entry, this pin will output keying confirmation tone that is 600 Hz signal and

30 ms duration. While DTMF output, the key tone will be disabled. To prevent signal

interference, while DTMF issue, it will disable key tone output except function key.

Oscillator input and output pins. A 3.579545 MHz crystal or ceramic resonator must

be crossed connection to XIN and XOUT pins which generate system clock.

The Tone/Pulse MUTE signal output pin that is NMOS open-drain output structure.

This pin will switch to “Low” level during Tone/Pulse dialing.

Otherwise, this pin stays “High impedance” level.

Positive and negative power supply input pins. Recommended operating voltage from

2.0Vdc to 5.5Vdc.

Handfree inputs pin which accepts falling edge signal to turn “on” or turn “off”

handfree function. This pin is hysteresis input structure and built-in pull up resistor

(typically 200 Kohms).

Handfree outputs pin that is designed to control telephone line for on-hook dialing or

control speakerphone circuit for handfree conversation. When handfree function is

executed, this pin will switch to“High”. Otherwise, this pin stays “Low” level.

The DTMF (Dual Tone Multi-Frequency) output pin. Normally, this pin stays“Low”

level. In Tone dialing mode, this pin will output DTMF signal that is corresponding

to keyboard 0..9, * and # keys.

Control signal inputs pin that is corresponding hook switch status. When handset was

left from cradle, this pin must be connected to “Low” level to operate all functions.

Otherwise, this pin must be connected to “High” level to disable all function and

prevent power consumption.

Pulse signal outputs pin that is NMOS open-drain output structure. Normally, this pin

stays “High impedance” level. In Pulse dialing mode and keypad was entry. This pin

will output pulse trains signal that is corresponding to keyboard 0 .. 9 keys.

Pulse signal outputs pin that is CMOS inverter output structure. Normally, this pin

stays “Low” level. During pulse signal dialing or flash function executing, this pin will

switch to “High” level to control the external circuit.

SDO function output that is NMOS open-drain structure. When there is a valid entry

on keyboard, this pin will output a serial data. This serial data is designed to drive LCD

driver to display dialing number on LCD screen or drive voice synthesizer to announce

dialing number to speaker.

No connection.

COL1~COL3 and COL5

COL4/KT

XIN and XOUT

XMUTE

and V

HFI

HFO

DTMF

HKS

SDO

* This specification are subject to be changed without notice.

10.1.1997

EM91220A Related Products

	EM91220A	EM91220	EM91220BP	EM91220AP	EM91220B	EM91220C	EM91220CK
Description	TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE	TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE	TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE	TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE	TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE	TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE	TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

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