EM91420 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 EM91420 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with
20-set memories. The EM91420 series provides 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.
· 20-set three 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, skinny.

ORDERING INFORMATION

Versions list and function outline

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

EM91420A

EM91420B

EM91420C

EM91420D

Note : PDP = Pocket Dialer Prevented

EM91420 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

AND DUAL-TONE MELODY GENERATOR

EM91420 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

EM91420

Pin Assignment

COL5

COL4/KT

COL3

COL2

COL1

XIN

XOUT

XMUTE

VSS

HDO

ROW4

ROW3

ROW2

ROW1

HKS

VDD

DTMF

EM91420AP

COL5

COL4/KT

COL3

COL2

COL1

XIN

XOUT

XMUTE

VSS

HFI

HDO

ROW4

ROW3

ROW2

ROW1

HKS

VDD

DTMF

HFO

EM91420BP

COL5

COL4/KT

COL3

COL2

COL1

XIN

XOUT

XMUTE

VSS

HFI

SDO

HDO

ROW4

ROW3

ROW2

ROW1

HKS

VDD

DTMF

HFO

EM91420CK

COL5

COL4/KT

COL3

COL2

COL1

XIN

XOUT

XMUTE

VSS

HFI

DRING

SDO

HDO

ROW4

ROW3

ROW2

ROW1

HKS

VDD

DTMF

HFO

RMUTE

EM91420DK

ROW1

ROW2

ROW3

ROW4

COL1

*/T

COL2

COL3

COL4/KT

RD/P

COL5

Keyboard Arrangement

EM91420 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

ROW2

ROW3

ROW4

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

HKS

HFI

VDD

DRING

VDD

RMUTE

SDO

PIN DESCRIPTIONS

Symbol

Function

ROW1~ROW4

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.

and V

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.

EM91420 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.

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
activated to prevent the illegal dialing from pocket dialer in the particular application.The
RMUTE can be restored to "High" level when the first key entry is not the optioned
lock-number .

No connection.

EM91420 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 EM91420 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

40:60

Tone

R-Vss

33:66

R-Vss

10 PPS

c. Flash time

d. Lock control method

ROW3

ROW4

Tf (ms)

COL1

Control method

600

R-Vdd

key lock

R-Vss

100

none lock

R-Vss

password lock

R-Vss

300

e. Lock number

COL2

COL3

Lock number

none

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.

EM91420 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 EM91420 series incorporated several sets repertory memory and each one can store number up to 16 digits.
These memories were designed to 20 sets types. As 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 20 sets memory

Indirect (three-touch) operation

Off-hook (or turn on HF function), push (ST, d1, d2, .. , dn, ST, n, n.) The numbers d1, d2, .. , dn will be stored
into memory location "n n". The "n n" expressed digital number from 01 to 20.

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

Indirect (three-touch) memory

· To select Pulse or Tone mode.

· Off-hook (or Turn on HF function), push A, n , n key. The numbers that are stored in indirect memory

location "n n" will be dialed out in Pulse or Tone mode as selection . The "n n" expressed digital number
from 01 to 20.

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)

EM91420 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

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")

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
EM91420 series. To prevent the unavoidable long distance call, then EM91420 inhibits the key entry during
Tdly.

EM91420 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

On-hook State

Off-hook State

On-hook

Hand-free State

HKS=Lo

HKS=Hi

On-hook

Hold-line State

Off-hook

Hand-free State

HKS=Hi

HKS=Lo

Off-hook

Hold-line State

HKS=Hi

bit 0

bit1

bit2

bit3

bit4

bit5

ready

start bits

data bits

stop bits

Operating flow chart

<Note> : HF = Handfree

HD = Hold

Truth table

Operating state

Input/Output pin level

HKS

XMUTE

HFO

HDO

(0) On-hook, idle state

(1) Off-hook line

(2) Off-hook, HF line

(3) On-hook, HF line

(4) Off-hook, HD line

(5) On-hook, HD line

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

Music on Hold

EM91420 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.

EM91420 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

"*"/T

*/"T"

output
b3,b2,b1,b0 0001 0010 0011 0100 0101 0110 0111

1000 1001 1010

1011 1100

1101 1110

Display

Function key (b5,b4=1,0)

keypad

Hold

(Lock state)

output
b3,b2,b1,b0

0000

1000

1010

1110

1111

0001

Display

STORE

HOLD

Speaker

clear all display

Lock

Function key (b5,b4=1,1)

keypad

output
b3,b2,b1,b0

1101

Display

Keypad,SDO format and LCD display reference table:

Keypad

bit5

bit4

bit3

bit2

bit1

bit0

Display

"*"/T

*/"T"

STORE

HOLD

Speaker

clear all display

(Lock state)

Lock

<Note> : The display of LCD panel "ST","Hold","HF","A","RD" is corresponding to EM32116 with flag types.

EM91420 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

LOCK function

The EM91420 serial provides the LOCK function to inhibit toll dialing operation. Connecting a resistor on COL1
pin to VSS can select different LOCK control method that is conventional key lock or password lock. Also the
lock number that can be selected by connecting the resistors on COL2 or COL3 pin. After power on reset, the
password is fixed to 000 automatically. The lock function is disabled when the password is equal to 000 .

How to setup password

· Set LOCK function to password control mode. (Connects a resistor on COL1 pin to VSS)
· Off hook (or turn on HF function)
· Push : # , # , ops1 , ops2 , ops3 , nps1 , nps2 , nps3 , # . If the ops1~ops3 are the same with current password,

then nps1~np3 will be stored in the dialer to replace current password. Otherwise, the current password can
not be updated. All the numbers pressed in the password setup procedure can not be dialed out when current
password is not equal to 000. If the current password are equal to 000, then only the first number "#" will be
dialed out.

Normal dialing :

Set lock function to none lock mode (without resistor connected to COL1 pin) or set password equal to 000.
In this case, the dialer is operated in normal mode and all functions work at unlimitation.

Dialing via LOCK function

Conventional key lock mode. (Connects a resistor on COL1 pin to VDD)

· Off hook (or turn on HF function)
· Keying : d1 , d2 , .. , dn . If the first number (d1) is the same with the lock number that optioned in table,

then all entry numbers can not be dialed out and keyboard will be inhibited until on to off hook once again.
If the first number is not equal to lock number, all the entry numbers will be dialed out.

Password control mode. (Connects a resistor on COL1 pin to VSS)

· Off hook (or turn on HF function)
· Keying : ([ # , ps1 , ps2 , ps3 ] + telephone number.) The numbers in the [ ] symbol could be omitted. The

number "#" will be inhibited when the current password is not equal to 000,and ps1 , ps2 , ps3 work at the
checking state, not to be dialed out. Other descriptions are as on following :

Incorrect password entry. The telephone numbers can not be dialed out.

Password is omitted . If the first digit of telephone numbers is the same with the lock number, all of the

telephone numbers can not be dialed out and keyboard will be inhibited until On to Off hook once again.

If the first digit is not equal to the lock number then the telephone numbers will be dialed out entirely.

Correct password entry. The telephone numbers can be dial out no matter what lock number is.

Ring detector

The Ring detector is designed to prevent illegal dialing from pocket dialer. Following the procedures ( i,ii,iii ),
this dialer will detect DRING pin to control RMUTE output level. If DRING is detected a "Low" level, the
RMUTE stays "High impedance". If DRING is detected a "High" level, the RMUTE will output "Low" until
keyboard entry. In actual application of the RMUTE pin is recommended connection to microphone of the

EM91420 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

phone handset to prevent that the dialing signal (DTMF) is coupling by the Microphone of the phone handset.
(such as pocket dialer)

In idle state, HKS is from "High" to "Low" (pick up handset action).

ii. In idle state, turn on handfree function.
iii. The flash operation ( F key ).

ABSOLUTE MAXIMUM RATINGS

(Ambient temperature is 25

C, all voltages referenced to V

)

Items

Sym.

Rating

Unit

Power supply voltage

6.0 Vdc

Input voltage range

-0.3V ~ V

+0.3V

Operating temperature

OPR

0 ~ +50

Storage temperature

STO

-55 ~ 125

Power consumption

500

ELECTRICAL CHARACTERISTICS

(Ambient temperature is 25

C, V

=2.5V unless otherwise noted, all voltages referenced to V

, Fosc=3.579545 MHz)

Parameter

Sym.

Min.

Typ.

Max. Unit

Condition

Operating voltage

Pulse

2.0

5.5

unload

Tone

2.0

5.5

Operating current(HKS=0)

Pulse

Idd

0.15

0.3

unload

Tone

0.3

0.5

Pulse

0.15

0.3

with pull up/down

Tone

0.3

0.5

resistor * 8

Memory retention current

Imrt

0.001

0.1

HKS=1,Vdd=1V

Standby current

HKS=1

Istby

0.001

0.1

unload

HKS=0

HKS=1

-0.001

0.1

with pull up/down

HKS=0

resistor * 8

HKS, HFI & DRING

ViH

0.8Vdd

Vdd

pins: input voltage

ViL

Vss

0.2Vdd

HFO & HDO pins source current

IoH

0.2

Vo = 2.0 V

PO, HFO, XMUTE, RMUTE

IoL

-0.2

Vo = 0.5 V

& SDO pins: sink current

PO, XMUTE, RMUTE and SDO

IoH

0.001 uA

Vo = Vdd

pins: leakage current

HFI pin input resistance

Rhfi

200

Vhfi = Vss

DRING pin input resistance

Rdring

100

Vdeing=Vss

Keyboard scanning pins

IoH

Vksn=Vss

output current (except COL4/KT)

IoL

200

400

800

ksn=Vdd

COL4/KT source current

IoH

0.2

Vo=2.0V

sink current

IoL

0.2

Vo=0.5V

EM91420 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

Parameter

Sym.

Min.

Typ.

Max. Unit

Condition

ELECTRICAL CHARACTERISTIC

(Ambient temperature is 25

C, V

=2.5V unless otherwise noted, all voltages referenced to Vss,Fosc=3.579545 MHz)

Keyboard debounce time

Tdb

Key tone signal:

frequency

Fkt

600

duration

Tkt

Pause time

3.6

sec.

Pulse to Tone waiting time

Tpt

3.6

sec.

Flash time

600

Row3B, Row4B=NR, NR

100

Row3B, Row4B=NR, R-Vss

Row3B,Row4B=R-Vss, NR

300

Row3B,Row4B=R-Vss,R-Vss

Pulse rate

PSR

pps

Row1 = R-Vdd

Row1 = R-Vss

Make/Break ratio

MBR

40:60

Row2 = NR

33:66

Row2 = R-Vss

Inter-digit pause time

Tidp

800

PSR = 10 pps

500

PSR = 20 pps

DTMF pin: sink current

IoL

-0.2

Vdtmf = 0.5 V

DTMF signal DC level

Vdc

0.5

0.75

Vdd

Vdd = 2.0V ~ 5.5V

DTMF signal: ac level

Vdtmf

142

160

180 mVrms Row group

pre-emphase

Twist

Column - Row

distortion

THD

-30

-23

RL = 5 K

load resistance

THD

< -

23dB

Minimum tone duration

100

Minimum inter-tone pause

Titp

100

Memory dialing

Melody output signal:
main tone ac level

(-23.3)

(dBm)

Vmtac

mVms Vdd =2.0V ~ 5.5V

Sub-tone

(-25.3) (dBm)

Vstac

mVms

Vdd =2.0V ~ 5.5V

HD key release hold function

Thdrdb

280

debounce time

SDO every bit time

Tbit

3.8

3.9

4.1

Off-Hook delay time

Tdly

300

EM91420 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

Figure 8. SDO operating timing

<Note>L=LSB,M=MSB, sT=START bit time, spT=STOP bit time

HD @

280

Thdrdb

HKS

KEY IN

HFO

HDO

XMUTE

SDO

MELODY

Hi-impedance

Figure 10. Off-Hook delay time

Tdly

"0" digit dialing time

HFI

HKS

KEY

OSC.

Hi-impedance

@ : It can be triggled by extension telephone set for hold function release

Figure 9. HF and HD operating timing

HKS

KEY IN

SDO

Tdb

sT b0

b3 b4

b5 spT spT

0 0

Tbit

Hi-impedance

EM91420 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

APPLICATION CIRCUIT

EM91420 series Application circuit

HANDSET

HANDFREE

SW1B

BRIDGE

TIP

470

ONHOOK

OFFHOOK

SW1A

A92

R47

220K

R54

10M

R48

100K

1N4148

R49

2K7

R52

220K

C16

.001U

R36

470K

R33

1K5

Q18

1815

HOOK

HFO

R55

470K

EM32100

JP9

Q14

C945

D16

1N4148

D17

1N4148

R56

47K

ROW1

D18

1N4148

HDO

EM32100

JP10

R65

220K

C17

.01U

Q19

1815

R67

C23

47U

C24

.1u

C31

220uF

D13

5V1

C945

R37

100K

C25

.1U

R35

2K2

A42

D14

1N4148

R69

47K

RING

BRIDGE

.1U

22U/50V

R68

100K

VDD

27V

1N4148

R43

47K

D19

1N4148

R57

47K

R44

22K

R45

47K

C21

.1uF

C22

1uF

C945

R46

10K

HDO

Q10

C945

AUDIO

POWER

AMPLIFER

COL4/KT

JUMPER

560K

DRING

4K7

PC817

*/T

RD/P

JUMPER

VDD

560k

EM91420DK

SDO

LCD DRIVER

VCC

1.5V

2 TO 4 LINE

SPEECH

NETWORK

DRING

3.58MHz

560k

BUZZER

10p

SDO

HDO

ROW4

ROW3

ROW2

ROW1

HKS

VDD

DTMF

HFO

RMUTE

COL5

COL4/KT

COL3

COL2

COL1

XIN

XOUT

XMUTE

VSS

HFI

DRING

EM91420 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

EM32100 Application Circuit :

Package type : QFP 48 pins or chip form provided

SEG5

SEG4

SEG3

SEG2

SEG1

COM1

COM2

COM3

TEST2

TEST1

F32H

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

MS1

MS2

SD1

HKS

XIN

XOUT

24/12

ENRTC

.1µ

EM32100

8/10 Digits LCD Pannel

1.5V

32768Hz

1µ

100k

200k

100k

20p

C945

220k

47k

DIODE

C945

HKS

HDO

HFO

SDO

EM91420 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

EM32116 Application Circuit :

Package type : QFP 64 pins or chip form provided

24/12

ENRTC

ENCLND

COM3

COM2

COM1

SEG31

SEG30

SEG29

SEG28

SEG27

SEG26

TEST2

BATCKOF

BATLOW

SEG0

SEG1

SEG2

SEG3

SEG4

SEG5

SRG6

SEG7

SEG8

SEG9

COM3

COM2

COM1

SEG31

SEG30

SEG29

SEG28

SEG27

SEG26

SEG25

SEG24

SEG23

SEG22

SEG21

SEG20

SEG19

SEG18

SEG17

SEG16

SEG15

SEG14

SEG13

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG6

SEG5

SEG4

SEG3

SEG2

SEG1

SEG0

SEG25

SEG24

SEG23

SEG22

SEG21

SEG20

SEG19

SEG18

SEG17

SEG16

SEG15

SEG14

SEG13

SEG12

SEG11

SEG10

XOUT

XIN

VSS

VC2

VC1

HKS

SDI

MS2

MS1

F32HZ

TEST1

EM32116

1.5V

OFF

CALENDAR

OFF

RTC

OFF

HOUR

20p

32768Kz

.1µF

SW HOOK

100k

.1µ

C945

470k

LINE

Hook Switch detection circuit

SDI

LCD110

EM91420 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

Example :

914XX P

(1)

(2)

(3)

(1) ELAN MICRO. pefix
(2) Type number
(3) Package code:

PDIP

Skinny

SDIP

PACKAGE INFORMATION

18/20/28 Lead Plastic Package

18 PDIP

MILIMETERS

INCHES

DIM

MIN.

MAX. MIN. MAX.

5.334

.210

0.381

.015

0.356

0.558

.014

.022

1.150

1.778

.045

.070

0.204

0.381

.008

.015

22.35

23.37

.880

.920

7.620

8.255

.300

.325

6.096

7.112

.240

.280

2.286

2.794

.090

.110

10.92

.430

2.921

4.064

.115

.160

20 PDIP

MILIMETERS

INCHES

DIM

MIN.

MAX.

MIN.

MAX.

5.334

.210

0.381

.015

0.356

0.558

.014

.022

1.150

1.778

.045

.070

0.204

0.381

.008

.015

25.40

26.67

1.000

1.050

7.620

8.255

.300

.325

6.096

7.112

.240

.280

2.286

2.794

.090

.110

10.92

.430

2.921

4.064

.115

.160

28 PDIP

MILIMETERS

INCHES

DIM

MIN.

MAX. MIN.

MAX.

6.350

.250

0.381

.015

0.356

0.558

.014

.022

1.016

1.778

.040

.070

0.204

0.381

.008

.015

35.56

37.85 1.400

1.490

15.24

15.88

.600

.625

13.21

14.73

.520

.580

2.286

2.794

.090

.110

17.78

.700

2.921

5.080

.115

.200

EM91420 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

22/24 Lead Plastic Package-Skinny

22 PDIP (skinny)

MILIMETERS

INCHES

DIM

MIN.

MAX.

MIN.

MAX.

4.752

.180

0.381

.015

0.356

0.558

.014

.022

1.27

1.778

.050

.070

0.204

3.556

.008

.014

25.90

26.67

1.02

1.05

7.620

8.255

.300

.325

6.223

6.604

.245

.260

2.286

2.794

.090

.110

8.382

10.16

.330

.400

2.921

4.064

.115

.160

24 PDIP (skinny)

MILIMETERS

INCHES

DIM

MIN.

MAX.

MIN.

MAX.

4.572

.180

0.381

.015

0.356

0.558

.014

.022

1.27

1.778

.050

.070

0.204

0.381

.008

.015

31.24

32.26

1.23

1.270

7.620

8.255

.300

.325

6.223

6.731

.245

.265

2.286

2.794

.090

.110

8.636

9.652

.340

.380

2.921

4.064

.115

.160

EM91420 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

42 SDIP Package

A A2

42 SDIP

MILIMETERS

INCHES

DIM

MIN.

MAX.

MIN.

MAX.

5.08

0.200

0.381

0.015

3.937

4.191

0.155

0.165

0.356

0.559

0.014

0.022

0.914

1.116

0.036

0.044

0.204

0.304

0.008

0.012

36.70

37.34

1.445

1.470

13.84

14.10

0.545

0.555

1.727

1.829

0.068

0.072

15.24

17.78

0.600

0.70

0.127

0.005

2.921

3.429

0.115

0.135

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: EM91420C

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: EM91420C