* This specification are subject to be changed without notice.

4.28.1999

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Prelim

inary

GENERAL DESCRIPTION

The EM91865 are 13 memory tone/pulse switchable dialer with Last Number Redail (LNB) anD SAVE function,
Which are fabricate in CMOS technology with wide operating voltage for both tone and pulse mode. EM91865
consumes very low memory retention current in on hook state. The EM91865 provide necessary functions of
telephone set for application in any environment, such as pulse dialing, tone (DTMF)dialing, handfree dialing. Beside
this, hold, mute and redial function are provide for particular operation. In redial mode EM91865 can auto insert
pause

time for application in PABX system. EM91865 also have a special I/O pin - VAO can used to

control

the receive volume amplify circuit.

FEATURES

· Volume add Control Function.
· One key Redial Function.
· Flash key is available and have multiple Flash time ( 600 ms, 300 ms, 100 ms ) can be selected.
· Auto Insert Pause Time.
· Tone/Pulse Switchable.
· Pulse mode fixed 10PPS.
· Pulse to tone ( P

T ) key is provided for PABX operation.

· Many options can be selected by R option.

Mode ( Pulse, Tone )
M/B ratio ( 40:60 ; 33:66 )
Auto insert pause time ( enable ; disable )

· 13 sets 16 digits one touch memory, or 3 set one touch and ten set two touch 16 digits

memory.

· One set 32 digits SAVE function.
· One set 32 digits LNB redial function.
· Mixed and cascaded dialing.
· Hold and Mute function.
· Hand Free dialing.
· Tone duration and inter -tone pause are fixed at 90 ms.
· Flash pause time are fixed at 600 ms.
· Pulse to Tone pause time are fixed at 3.6sec.
· Uses 3.579545 MHz crystal or ceramic resonator (with built-in capacitor, no need extra capacitor).
· Package in DIP 18 or DIP 16.

Total System

· Operating voltage : 2.0V ~ 5.5V
· Operating current : Tone mode 0.3 mA (typical) ~ 0.5 mA

Pulse mode 0.15 mA (typical) ~ 0.2 mA

· Standby current : 0.01 uA ( typical ) 0.1 uA ( max. )
· Use single clock 3.579545 MHz crystal

* This specification are subject to be changed without notice.

4.28.1999

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Prelim

inary

PIN ASSIGNMENTS

PIN DESCRIPTIONS

Symbol

Function

K2 , K3 , K5 ~ K8

Key board scan I/O pins, key scans by ripple way.

I/O pin

These pins output 16K Hz signal one by one and periodically for key board scan.

K1/HDO

This pin has two functions
Normally this pin will be a Key board scan pins function same as K1~K8.
In Hold condition this pin will stay in "High" level to control the Hold circuit and scan HD
input key. In Hold condition all key will not allow keying except HD, HF and Hook switch.

K4/MuteO

This pin has two functions
Normally this pin will be a Key board scan pins function same as K1~K8.
In MUTE condition this pin will stay in "High" level and output signal with the inverse of key
scan to control the MUTE circuit and scan input key. Any key input will release MUTE
condition.

K6/XMUTE

This pin has two functions
Normally this pin will be a Key board scan pins function same as K1~K8.
The Tone/Pulse dialing Mute signal output pin. This pin will switch to "High" level during
Tone/Pulse dialing and hold function. Otherwise, this pin DC level stays "Low".

VDD, VSS

Positive and negative power supply input pin

Xin, Xout

Oscillator input and output pins, built in two 5pf capacitor so it's not need external capacitor.
A 3.579545 MHz crystal must be crossed between Xin and Xout.

HFI

Handfree function Input pin accepts rising edge signal to turn "on" or turn "off" handfree
function. This pin is hysteresis input structure and built-in pull down resistor (typically 200
K

) .

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.

HKS

Hook Switch detects input pin, which is hysteresis input structure and without internal pull
up resistor.

DTMF

DTMF (Dual Tone Multi-Frequency) output pin, In tone dialing mode, this pin will output
DTMF signal that is corresponding to key board 0~9, *, # key.

Pulse signal output pin that is NMOS open-drain. This pin is for pulse dialing. This output is
"Low" during pulse dialing blank duration and Flash operation active, otherwise will be "High
impedance".

VAO

Volume Add output pin , which is open drain structure.
Normally this pin will stay in "High Impedance". When Volume add active and dialer in OFF-
HOOK mode operting then this pin will output "Low".

K6/XMUTE

K4/MUTEO

XIN

XOUT

VSS

VAO

K1/HDO

DTMF

HKS

VDD

EM91865A

EM91865B

K6/XMUTE

K4/MUTEO

XIN

XOUT

VSS

VAO

HFI

K1/HDO

DTMF

HKS

VDD

HFO

* This specification are subject to be changed without notice.

4.28.1999

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Prelim

inary

Key Assignment :

EM2

SAVE

*/T

MUTE

EM3

EM1

HDO

MuteO

R_option

XMUTE

KEYBOARD DESCRIPTION :

Key

Description

0~9, *, #

Digit key

F1, F2, F3

Flash key, flash time F1=600ms F2=300ms F3=100ms

*/T

In Pulse mode, this key mean Pulse to Tone function key

Redial and One key Redial key

Pause key.

Hold function key, at hold mode to key in "HD" key will go to idle On-hook
state

Handfree function key

SAVE

SAVE function key

Store memory function key

EM1~EM3, M1~M10

One touch memory function key

Recall key for two touch memory Recall

Volume Add key.

MUTE

MUTE key. When this key be pressed MuteO output will be "high", and
any key-in will release mute.

* This specification are subject to be changed without notice.

4.28.1999

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Prelim

inary

FUNCTION DESCRIPTIONS

Dialer Option selection

The EM91865 incorporated a special keyboard scanning function that is connecting a resistor ( typically is
560 K

) on keyboard scan pin to select many telephone specifications.

The specifications are described as follow :

a. M/B ratio

M/B ratio

40:60

R-Vss

33:66

b. Auto Insert Pause time

d. Mode

Auto Insert

Mode

Pause time

Disable

Tone

R-Vss

Enable

R-Vss

Pulse

Normal Dialing :

Press the digital key directly on keyboard which number can be dialing out and stored in LNB memory auto
matically. Operating procedure described as following:
· To select Pulse or Tone mode.
· Off-Hook or turn on HF function.
· Keying d1,d2,....dn. The "d" expressed digital key pressed that include 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 Function :

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.

Redialing :
EM91865 provide Redial and One Key Redial function

(1) Redial function

Off-Hook normal dialing directly keying "F" key (or ON-OFF Hook once) and key-in "RD" keyboard.
The numbers stored in LNB memory will be dialed out.

(2) One Key Redial function

Off-Hook normal dialing, if busy, press the "RD" key directly then the line will be broken about 1.2 sec
with Trp redial pause time and dial out the numbers stored in LNB memory automatically.

* This specification are subject to be changed without notice.

4.28.1999

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Prelim

inary

Auto Insert Pause Time Function

EM91865 Provides a new function - Auto Insert Pause Time function - for PABX system user. In PABX
system, we usually use a special number to identify the phone want dial out or just a internal phone. So between
the first and second number, the PABX system will switch to central office, that will be few second switch time.
The auto insert pause time function will auto insert the pause time between first and second digit in redialing mode.
This function are provide a pause time to wait PABX switch to Central Office. In fact, the pause time are record
the waiting time of last dialing between the first and second digit. The auto insert pause minimum duration are equal
0 second, maximun duration are equal 3.5 second, and pause duration scale are 0.1 second. So, if the time during
user keying first and second digit are longer than 3.5 seconds, the auto insert pause time will be limited at 3.5 second.
By this function, we can redial the correct number out in PABX system. This function can select enable or disable
by R_option.

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, P , k1, k2, ..... ,kn). These numbers will be dialed out

as following sequence :

d1, d2,.....dn, Tp, k1, k2, ..... ,kn (Tp are the pause Time)

SAVE redial memory

The SAVE memory is designed in EM91865 to support digits capacity buffer for second redial, pager, special
memory for memo and other system applications.

Storing : EM91865 support two operating methods to store numbers into SAVE redial memory.
Method 1 :
· To select Pulse or Tone mode.
· Off-hook(or turn on HF function), push d1, d2 ....., dn. The numbers d1, d2,..., dn will be dialed out in Pulse

or Tone mode as selection.

· After dn had been dialed out and push [ST]. SAVE key. If the keying numbers are more than 32 digits that

content of SAVE memory can not be updated. Otherwise, these numbers will be stored into SAVE memory.

Noted : In the [ ] key allows to be omitted.

· SAVE buffer are the length 32 digits number.

Method 2 :
On or Off-hook (or turn on HF function), push ST, d1, d2 ....., dn, [ST], SAVE. If the keying are not over 32 digits,
the numbers d1, d2, ....., dn will be stored in SAVE redial memory automatically.

Dialing
· To select Pulse or Tone mode.
· Off-hook (or turn on HF function or after executing Flash function), first push SAVE key. The numbers stored

in SAVE memory will be dialed out in Pulse or Tone mode as selection.

* This specification are subject to be changed without notice.

4.28.1999

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Prelim

inary

One Touch memory :

The EM91865 incorporated 13 sets one touch memory each one can store numbers up to 16 digits. In memory
storing, if stored numbers are more than 16 digits that only the previous 16 digits can be stored into specific
memory.

Storing of 13 sets memory :
On-Hook or Off-Hook state, push (ST, d1, d2,.....di, [ST], EMn or Mn). The numbers d1, d2,....di will be stored
into memory location "n", the "n" expressed digital key from 1~3 for EM and 0~9 for M.

Dialing (after memory dialed out, the numbers of memory will copy to LNB) :
· To select Pulse or Tone mode.
· Off-hook (or turn on HF function), push EMn or Mn key. The memory content will be dialed out.

Two Touch memory :

The EM91865 incorporated 10 sets two touch memory each one can store numbers up to 16 digits. In memory
storing, if stored numbers are more than 16 digits that only the previous 16 digits can be stored into specific
memory.

Storing of 10 sets two Touch memory :
On-Hook or Off-Hook state, push (ST, d1, d2,.....dn, ST, m). The numbers d1, d2,....dn will be stored into memory
location "Mm", the "m" expressed digital key from 0~9 map to M0~M9.

Dialing (after memory dialed out, the numbers of memory will copy to LNB) :
· To select Pulse or Tone mode.
· Off-hook(or turn on HF function), push(RC , m). The memory content in Mm will be dialed out.

Cascade dialing :

Let

EM1=1,2,3
EM2=4,5,6
EM3=7,8,9

At off-hook state, key in EM1, EM2, EM3, the LNB=1,2,3,4,5,6,7,8,9, and the number will be dialed out.
The max. cascade dialing numbers are 32 digits.

Mixing dialing :

Let

LNB=7,8,9
M2=4,5,6
EM1=1,2,3

At off-hook state, key in "RD", EM1, *, 0, P, ( A , 2 ) , then the LNB=7,8,9,1,2,3,*, 0, P,4,5,6, and the number
will be dialed out.

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 be 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 :

* This specification are subject to be changed without notice.

4.28.1999

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Prelim

inary

d1, d2,....dn, Tpt, k1, k2, .....,kn. (Tpt are the Pulse to Tone pause time)
(pulse mode) (tone mode)

Flash(F=F1,F2,F3) key operation

The Flash key is designed to break telephone line temporarily. After key is depressed, this dialer will send a flash
signal to break line and reset all condition. The Flash's break time dependent on the which key be pressed,
F1=600ms, F2=300ms, F3=100ms.

Handfree (HF) function

The Handfree function are provided in advance version EM91865B to support on-hook dialing and loudspeaker
application which can be turn "on" or "off" by pressed again "HF" key. 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.
· Pressed "HF" key
· 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 back to idle On_Hook state
· Turn on Handfree (HF) function.(HFO pin switched to "High")

** In Hold state all key board will be disable except "HF" , "HD" key and HKS switch

Mute function

The EM91865 provide mute function to mute microphone or antler at off-hook (or turn on HF) state. When key-
in "MUTE" key, "MuteO" pin will become "High" to mute microphone. Any key-in will release mute mode and
operating the correct key.

Volume add function

EM91865 provide Volume Add function to control the speech network for adding the receiving volume. Except
idle On-Hook state, Volume add function will working effect no matter what state is. Volume add function are
toggle structure. Every time touch VA key will inverter the VAO pin condition ( H

.....). So Volume

add will active or release each time keying VA. If and only if, when dialer back to the idle On_Hook state then
the Volume add function will force to release. This solution protect the user will not be hurt by loud volume.
Although Volume add state will not change by Off_Hook or HF operation but if dialer are in HF mode then
Volume add outpout (VAO) will be inhibited.

Noted : Except dialer back to idle state, any other operate will not reset volume add situation ( include HD,

HF, Flash ..... , and so on ). So volume add situation will be hold until dialer back to idle.

* This specification are subject to be changed without notice.

4.28.1999

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Prelim

inary

<Note> : HF=Handfree

HD=Hold

(1) On_Hook

state

(2)

Off_Hook

state

(4)

On_Hook

state

(3)

Off_Hook

(5)

Off_Hook

(6)

On_Hook

HKS=L

HKS=H

HKS=L

HKS=H

OPERATING FLOW CHART

Truth Table :

Operating state

Input / Output pin level

HKS

XMUTE

HFO

HDO

(1)On-hook, idle state

(2)Off-hook line

(3)Off-hook, HF line

(4)On-hook, HF line

(5)Off-hook, HD line

(6)On-hook, HD line

Note : Z= floating (high impedance) ; H= logic "High" ; L= logic "Low" level.

@ = To doing R-option

* This specification are subject to be changed without notice.

4.28.1999

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Prelim

inary

ABSOLUTE MAXIMUM RATINGS

(Ambient temperature is 25

C, all voltages referenced to V

)

Items

Sym.

Rating

Unit

Power supply voltage

6.0

Input voltage range

-0.3V ~ V

+0.3V

Operating temperature

OPR

0 ~ +70

Storage temperature

STO

-55 ~ 150

Power consumption

500

D.C. ELECTRICAL CHARACTERISTICS

=0V; T

OPR

C to 70

C, V

=3V unless otherwise noted)

Parameter

Sym. Min.

Typ. Max. Unit

Condition

Operating voltage

Tone

2.0

5.5

unload

Pulse

2.0

5.5

Memory retenion

1.0

5.5

Standby current

Istby

0.001

0.1

µA

Idle On_Hook state

0.15

0.3

Operating current

Tone

0.3

0.5

Pulse

0.15

0.3

Memory retention current

Imrt

0.001

0.1

HKS=1,Vdd=1V

HKS , HFI

ViH

0.7

Schmitt trigger

Input voltage

ViL

Vss

0.3

HFO

IoH

-0.2

Vo=2.5V

Drive current
Sink current

IoL

0.2

Vo=0.5V

HFO pull down resistor

Rhf

200

VAO

IoH

-0.01

Vxmute=Vdd

Leakage current
Sink current

IoL

Vxmute=0.5V

MuteO , HDO , XMUTE

IoH

-270

-350

-420

Vo=2.5V

Drive current
Sink current

IoL

Vo=0.5V

K2 , K3 , K6 , K7 , K8

IoH

-270

-350

-420

Vo=2.5V

Output current

IoL

Vo=0.5V

PO Sink current

IoL

1.5

Vo=0.5V

RECOMMENDED OPERATING CONDITIONS

1. Supply voltage range from 2 V to 5.5 V at fc=3.58 MHz
2. Operation frequency: 3.58 MHz crystal.

* This specification are subject to be changed without notice.

4.28.1999

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Prelim

inary

DTMF CHARACTERISTICS

= 0V , V

= 3V , Topr = 0

C to 70

Symbol

Description

Min.

Typ.

Max.

Unit

Twist

Twist=20 LOG(COL/ROW)

DC level

Vdc , Vdd=2.0V~5.5V

0.55

0.7

Vdd

Dist

Distortion

-30

-23

Ac level

Row group

130

155

180

mVrms

Sink current

Vdtmf=0.5V

0.2

Load resistor

Dist<-23dB

Minimum tone duration

Td ( redial )

Minimum intertone pause

Titp ( redial )

ACTUAL FREQUENCY OUTPUT

( fosc =3.579545 Hz )

Standard (Hz )

Output ( Hz )

Deviation ( % )

697

699

+0.28

770

766

-0.52

852

848

-0.47

941

948

+0.74

1209

1216

+0.57

1336

1332

-0.30

1477

1472

-0.34

Parameter

Sym.

Min.

Typ.

Max. Unit

Condition

ELECTRICAL CHARACTERISTIC

-V

=3.0V,Fosc=3.58 MHz)

Keyin or release debounce

Tdb

Pulse rate

PSR

pps

Make/Break ratio

MBR

40:60

K2 pin=NR

33:66

K2 pin=R-Vss

Inter-digit pause time

Tidp

800

Pause time

3.6

Pulse to tone time

Tpt

Flash break time

600

F1 key

300

F2 key

100

F3 key

Flash Pause time

Tfp

600

Tone duration

One key redial Break time

Trb

1.2

One key redial Pause time

Trb

Scan wave width

Tsw

1/32

Scan wave period

Tsp

0.25

Key board scan Period

Tksp

2.25

Auto Insert Pause

Taip

3100

Pre-Mute time

Tpm

* This specification are subject to be changed without notice.

4.28.1999

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Prelim

inary

APPLICATION CIRCUIT : CONTROL CIRCUIT

HFO

/PO

HDO

TIP

RING

OFF-HOOK

ON-HOOK

SPEECH

Network

KEYBOARD

Auto Release HOLD Function

Circuit

VDD

0.1u

5V1

33K

47K

103

22K

C945

470K

33K

104

1N4148

104

1N4148

47K

16V/1W

10U

220K

C945

47K

470K

47K

240K

100K

10M

HOOK-SW

A92

3K3

A42

33K

1N4148

100K

1N4148

220K

100K

470K

C945

470u

LED

1N4148

10K

104

1N4148

100K

1N4148

3.58M

103

100K

C945

100K

EM91865B

K6/XMUTE

K4/MuteO

XIN

XOUT

VSS

VAO

HFI

HFO

K1/HDO

DTMF

HKS

VDD

XMUTE

MuteO

HFO

I_LOOP

DTMF

/VAO

SPEAK_Power

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: EM91865A

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: EM91865A