EMC EM91441 Series Bedienungsanleitung

EM91441 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

* This specification are subject to be changed without notice. 10.1.1997

GENERAL DESCRIPTION

The EM91441 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with

40-set memories. The EM91441 series provide necessary functions of telephone set for application in any

environment, such as Pulse dialing, Tone (DTMF) dialing, Handfree dialing, keying tone ,and lock functions.

The lock function is designed to inhibit toll dialing operation. Beside this, melody generator, ring detector and

SDO (Serial Data Output) functions are provided in advance version. Melody generator will output dual-tone

music in line hold duration. Ring detector can prevent illegal dialing from pocket dialer. The SDO 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, lock dialing functions.

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

• Line hold function is designed for stopping conversation temporality.

• Melody generator provides music on hold function.

• Lock function provides conventionality key lock and password lock operations.

• Ring detector is designed to prevent illegal dialing from pocket dialer.

• 40-set one touch repertory memory, each one can hold data up to 16 digits.

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

• Keytone function provides rapidly keying recognition.

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

• Pause and P-T time are fixed to 3.6 seconds.

• Tone duration and inter-tone pause time are fixed to 98 ms.

• Using 3.579545 MHz crystal or ceramic resonator.

• Package forms: PDIP ( 28 pins package ) , SDIP ( 42 pins package)

ORDERING INFORMATION

Versions list and function outline

VERSION LNB KT HOLD(music) LOCK HF SDO(LCD) PDP

EM91441B √√ √ √√

EM91441D √√ √ √√√√

Note : PDP = Pocket Dialer Prevented

EM91441 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

EM91441 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

* This specification are subject to be changed without notice. 10.1.1997

EM91441

Pin Assignment

ROW10

ROW8

ROW6

COL5

COL4/KT

COL3

COL2

COL1

XIN

XOUT

XMUTE

VSS

HFI

ROW12

ROW9

ROW7

ROW5

HDO

ROW4

ROW3

ROW2

ROW1

HKS

VDD

DTMF

HFO

ROW11

EM91441BP

ROW1

ROW2

ROW3

ROW4

ROW5

ROW6

ROW7

ROW8

ROW9

ROW10

ROW11

ROW12

COL1

*/T

M11

M16

M21

M26

M31

M36

COL2

M12

M17

M22

M27

M32

M37

COL3

M13

M18

M23

M28

M33

M38

COL4/KT

RD/P

M14

M19

M24

M29

M34

M39

COL5

PAGE

M10

M15

M20

M25

M30

M35

M40

ROW10

ROW8

ROW6

COL5

COL4/KT

COL3

COL2

COL1

XIN

XOUT

XMUTE

VSS

HFI

DRING

ROW12

SDO

ROW9

ROW7

ROW5

HDO

ROW4

ROW3

ROW2

ROW1

HKS

VDD

DTMF

HFO

RMUTE

ROW11

EM91441DR

Keyboard Arrangement

EM91441 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

* This specification are subject to be changed without notice. 10.1.1997

FUNCTIONAL BLOCK DIAGRAM

COL1

COL2

COL3

COL4/KT

COL5

XIN

XOUT

ROW1

ROW12

HFO HDO XMUTE

Keyboard

interface

(column)

Oscillator

Keyboard

interface

(Row)

Output circuit

Memory

(Melody)

Timing/Control circuit

Input circuit Pulse

generator

latch

decoder

D/A

converter

Row/Column

programming counter

DTMF

HKSHFI

VDD DRING

VDD

RMUTE

SDO

PIN DESCRIPTIONS

Symbol Function

ROW1~ROW12 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.

COL1~COL3 and COL5 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.

COL4/KT 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. To prevent signal interference, while DTMF issue, it will disable key

tone output except function key.

XIN and XOUT 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.

XMUTE 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 and hold function .

Otherwise, this pin stays “High impedance” level.

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

2.0Vdc to 5.5Vdc.

HFI 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).

HFO 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.

DTMF The DTMF (Dual Tone Multi-Frequency) and music signals 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. Beside this, in the line hold

duration, this pin will issue dual-tone music for telephone line.

EM91441 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

* This specification are subject to be changed without notice. 10.1.1997

Symbol Function

HKS 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.

PO 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.

HDO Hold function output that is CMOS structure.Normally, this pin stays “Low” level.

When Hold function is executing, this pin will output “High” level. This pin is

designed to drive LED or peripheral circuit to indicate line is at Hold status.

SDO 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.

DRING The ring signal detect input pin which is internal pull up (built-in 100 Kohms resistor).

While the Tel-ring is incoming, this pin must be connected to “Low” with delay to

indicate the ringing . Otherwise, this pin must be connected to “High” level .

RMUTE Ring mute output pin that is NMOS open-drain structure. The RMUTE pin is

designed to control microphone of handset to prevent the illegal dialing from pocket

dialer. If the DRING pin is at “High” level , then Off-Hook or turn on Handfree , this

pin will output “Low” level. In other words, the DRING pin is used to check the phone

that receives an incoming call (DRING =Low input) or make an outgoing call

(DRING= High input) . If the phone user make an outgoing call ,then RMUTE pin

activatedtopreventtheillegaldialingfrompocketdialerintheparticularapplication.The

RMUTE can be restored to “High” level when the first key entry is not the optioned

lock-number .

NC No connection.

EM91441 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

* This specification are subject to be changed without notice. 10.1.1997

FUNCTION DESCRIPTIONS

Dialing signal selection

The EM91441 series incorporated a special keyboard scanning function that is connecting a resistor (typically

is 560 Kohms) on keyboard scan pin to select many telephone specifications. The specifications are described

as following :

a. Mode b. M/B ratio

ROW1 Mode ROW2 MBR (%)

R-Vdd 20 PPS NR 40:60

NR Tone R-Vss 33:66

R-Vss 10 PPS

c. Flash time d. Lock control method

ROW3 ROW4 Tf (ms) COL1 Control method

NR NR 600 R-Vdd key lock

NR R-Vss 100 NR none lock

R-Vss NR 80 R-Vss password lock

R-Vss R-Vss 300

e. Lock number

COL2 COL3 Lock number

NR NR none

NR R-Vss 0

R-Vss NR 9

R-Vss R-Vss 0.9

Normal dialing

Directly keying digital key on keyboard which number can be dialing output and stored in LNB memory

automatically. Operating procedure described as follow :

• To select Pulse or Tone mode.

• Off-hook or turn on HF function.

• Keying d1, d2, .. , dn. The “d” expressed digital keypad that included 1~9, *, 0, #, P, and P→T keys. The “n”

expressed unlimited.

• The numbers d1, d2, .. , dn will be dialed out in Pulse or Tone mode as selection.

LNB redial memory

Storing:

In normal dialing mode, every digital key was entry which number will be stored in LNB memory

automatically. If entry digits are more than 32 digits, the redial function of LNB memory will be disabled.

Otherwise, these numbers stored in LNB memory can be redial output.

EM91441 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

* This specification are subject to be changed without notice. 10.1.1997

Redialing:

After normal dialing, directly keying F key (or On-Off hook once) and keying RD key on keyboard. The

numbers that are stored into LNB memory will be dialed output.

Repertory memory

The EM91441 series incorporated several sets repertory memory and each one can store number up to 16 digits.

These memories were designed to 40 sets types. As operating precedure, all of the memories can be separated

to dirtect (one-touch) and indirect (two-touch) operation. In memory storing, if stored numbers are more than

16 digits that only the previous 16 digits can be stored into specific memory. Otherwise, these numbers can be

stored entirely. After memory dialed out, the content of LNB is keeping to current data.

Storing of 40 sets memory types

Direct (one-touch) operation

Off-hook (or turn on HF function), push (ST, d1, d2, .. , dn [ST], Mn.) The numbers d1, d2, .. , dn will be stored

into memory location “Mn”. The “Mn” expressed memory location M1 to M40.

Indirect (two-touch) operation

Off-hook (or turn on HF function), push (ST, d1, d2, .. , dn, [ST], Page, Mn). The numbers d1, d2, .. , dn will

be stored into memory location “Mn”. The “Mn” expressed memory location M1 to M20. The Page+M1 is

mapping to memory location M21, Page+M2 is mapping to memory location M22, ... , Page+M20 is mapping

to memory location M40.

Dialing (after memory dialed out, the content of LNB is keeping to current data)

Direct (one-touch) memory operation

• To select Pulse or Tone mode.

• Off-hook (or Turn on HF function), push Mn key. The numbers that are stored in direct memory location

“Mn” will be dialed out in Pulse or Tone mode as selection. The “n” expressed digital number from 1~40

decided by dialers’ memory sets.

Indirect (two-touch) of 40 sets memory types

• To select Pulse or Tone mode.

• Off-hook (or Turn on HF function), push Page, Mn key. The numbers that are stored in indirect memory

location “Page Mn” will be dialed out in Pulse or Tone mode as selection. The “Mn” expressed memory

location M1 to M20. The Page+M1 is mapping to memory location M21, Page+M2 is mapping to memory

location M22, ... , Page+M20 is mapping to memory location M40.

EM91441 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

* This specification are subject to be changed without notice. 10.1.1997

Pause (P) key operation

The Pause (P) key is designed to support pause operation in dialing duration. “P” key can be stored in memory

and it will occupy one digital position.

• To select Pulse or Tone mode.

• Off-hook (or turn on HF function), push (d1, d2, .. , dn, RD/P, k1, k2, .. , kn.) These numbers will be dialed

out as following sequence:

d1, d2, .. , dn, Tp, k1, k2, .. , kn.

Pulse to Tone (*/T) key operation

The Pulse to Tone (*/T) key is designed to support toll dialing (long distance call) or PABX system operation.

The “*/T” key can be stored in memory and it will occupy one digital position.

• To select Pulse mode.

• Off-hook (or turn on HF function), push d1, d2, .. , dn, */T, k1, k2, .. , kn. These numbers will be dialed out

as following sequence:

d1, d2, .. , dn, Tpt, k1, k2, .. , kn.

(pulse mode) (tone mode)

Flash (F) key operation

The Flash (F) key is designed to break telephone line temporarily. After F key is depressed, this dialer will send

a flash signal to break line 600 ms, 300 ms, 100 ms or 80 ms as ROW3 and ROW4 selection.

Handfree (HF) function

The handfree function is designed to support on-hook dialing and loudspeaker application which can be turn “on”

or “off” with falling edge signal from HFI pin. During handfree function is executed, the HFO pin is switched

to “high”. Otherwise the HFO pin stays “low” level. One of the following operations can turn off Handfree

function (HFO pin return to “Low”).

• On-off hook once.

• Trigger HFI pin with falling edge signal.

• Turn on Hold (HD) function. (HDO pin switched to “High”)

Hold (HD) function

The Hold function is designed to stop conversation temporarily. In off-hook state (or HF function is turned on),

to press HD key on the keyboard, the Hold function can be turned “on” (HDO pin switched to “High”). One of

the following operations can turn off Hold function (HDO pin switched to “Low”).

• On-off hook once.

•To press HD key over 280 ms.

• Turn on Handfree (HF) function. (HFO pin switched to “High”)

EM91441 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

* This specification are subject to be changed without notice. 10.1.1997

Special Note:

A 300 ms delay time (Tdly) at the first Off-Hook or turn on Handfree that is a special designed to avoid a rapid

key entry (dummy number ) in this time duration ,and a long distance call number follows. For example,

Off-Hook , “3” ,............ , “0” ,1,2,3......

Dummy key Lock number key

The dummy number “3” is not detected by the centered office or PABX ,but the following numbers “0” ,1,2,3...

long distance call can be dialed out normally since the leading number “3” is not the Lock-number defined in

EM91441 series. To prevent the unavoidable long distance call, then EM91441 series inhibits the key entry during

Tdly.

EM91441 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

* This specification are subject to be changed without notice. 10.1.1997

Operating flow chart

<Note> : HF = Handfree

HD = Hold

Truth table

Operating state Input/Output pin level

HKS PO XMUTE HFO HDO

(0) On-hook, idle state H F F L L

(1) Off-hook line L F F L L

(2) Off-hook, HF line L F F H L

(3) On-hook, HF line H F F H L

(4) Off-hook, HD line L F L L H

(5) On-hook, HD line H F L L H

Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level.

Music on Hold

EM91441 series built-in a melody generator to generate dual-tone music on DTMF output pin. The music is

designed for telephone line at line holding.

SDO (Serial Data Output) function

The SDO is serial data output which format is same as UART protocol. SDO function is designed to drive LCD

driver and voice synthesizer. So the dialing numbers can be display on LCD screen with EM32100 (or EM32116

). The SDO signal consists of two start bits, six data bits and two stop bits. Each bit time is about 3.9 ms (256 Hz)

and output sequences are following by start bits, data bits (LSB to MSB) and stop bits.

01 bit 0 bit1 bit2 bit3 bit4 bit5

ready start bits data bits 01

stop bits

On-hook State

Off-hook State

On-hook

Hand-free State

HKS=Lo

HKS=Hi

HD HF

HD 6

On-hook

Hold-line State

Off-hook

Hand-free State

HKS=Hi

HKS=Lo

Off-hook

Hold-line State

HKS=Hi

EM91441 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

* This specification are subject to be changed without notice. 10.1.1997

SDO Keypad Encoded table:

♦Digital key (b5,b4=0,0)

keypad 1 2 3 4 5 6 7 8 9 0 “*”/T # P */”T”

output

b3,b2,b1,b0 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110

Display 1 2 3 4 5 6 7 8 9 0  P

♦ Function key (b5,b4=1,0)

keypad ST Hold HF Page F (Lock state)

output

b3,b2,b1,b0 0000 1000 1010 1100 1111 0001

Display STORE HOLD Speaker PAGE clear all display Lock

♦Function key (b5,b4=1,1)

keypad M1~M40 RD

output

b3,b2,b1,b0 1100 1101

Display MEMORY RD

<Note> : The display of LCD panel “ST”,”Hold”,”HF”,”Page”,”M1~M40”,”RD” is corresponding to EM32116

with flag types.

∗Keypad,SDO format and LCD display reference table:

Keypad bit5 bit4 bit3 bit2 bit1 bit0 Display

1000001 1

2000010 2

3000011 3

4000100 4

5000101 5

6000110 6

7000111 7

8001000 8

9001001 9

0001010 0

“*”/T 0 0 1 0 1 1 

#001100 

P001101 P

*/”T” 0 0 1 1 1 0

ST 1 0 0 0 0 0 STORE

HOLD 1 0 1 0 0 0 HOLD

HF 1 0 1 0 1 0 Speaker

PAGE 1 0 1 1 0 0 PAGE

F 1 0 1 1 1 1 clear all display

(Lock state) 1 0 0 0 0 1 Lock

M1~M40 1 1 1 1 0 0 MEMORY

RD 1 1 1 1 0 1 RD

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