Datasheet EM91455DK, EM91455CK, EM91455BP, EM91455AP Datasheet (ELAN)

GENERAL DESCRIPTION

The EM91455 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with
3 sets memories. The EM91455 provide modern LCD driver's series data output port, which can display modern
function operating icons. The EM91455 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, ring detector and SDO (Serial Data
Output) functions are provided in advance version. 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 and
modern function operating icons can be displayed on LCD screen with LCD driver (EM32100 or EM32117 ).
The EM91455 has a special I.P.P. detect function (Illegal Parallel Phone Detect) can prevent the illegal connect
external Phone. The I.P.P. will detect the illegal user. When illegal user pickup phone, the function will alarm
and send the alarm signal to the telephone line to interfer the illegal dialing.

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

FEATURES

• I.P.P. detect function prevents the illegal connect external phone.

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

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

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

• Line hold function is designed for stopping conversation temporality.

• 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.

• 3-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, skinny.

ORDERING INFORMATION

Versions list and function outline

VERSION LNB KT HOLD I.P.P. LOCK HF SDO(LCD) PDP
EM91455A √√√√√
EM91455B √√√√√√
EM91455C √√√√√√√
EM91455D √√√√√√√√
Note : PDP = Pocket Dialer Prevented

: I.P.P. detect = Illegal Parallel Phone Detect.

* This specification are subject to be changed without notice.

9.24.1998

1

EM91455

Pin Assignment

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

EM91455AP

COL5

COL4/KT

COL3
COL2
COL1

XIN

XOUT

XMUTE

VSS

EM91455CK

NC

COL5

COL4/KT

COL3
COL2
COL1

XIN

XOUT

XMUTE

VSS

HFI

10
11

EM91455BP

1

1

18

HDO

2

17

PO

3

16

ROW4

4

15

ROW3

5

14

ROW2

6

13

ROW1

7

12

HKS

8

11

VDD

9

10

DTMF

COL5

COL4/KT

COL3
COL2
COL1

XIN

XOUT

XMUTE

VSS

HFI

10

20

HDO

2

19

PO

3

18

ROW4

4

17

ROW3

5

16

ROW2

6

15

ROW1

7

14

HKS

8

13

VDD

9

12

DTMF

11

HFO

EM91455DK

NC

1

24

1

22

SDO

2

21

HDO

3

20

PO

4

19

ROW4

5

18

ROW3

6

17

ROW2

7

16

ROW1

8

15

HKS

9

14

VDD

13

DTMF

12

HFO

COL5

COL4/KT

COL3
COL2
COL1

XIN

XOUT

XMUTE

VSS

HFI

DRING

2
3
4
5
6
7
8

9
10
11
12

23
22
21
20
19
18
17
16
15
14
13

SDO
HDO
PO
ROW4
ROW3
ROW2
ROW1
HKS
VDD
DTMF
HFO
RMUTE

Keyboard Arrangement

ROW1
ROW2
ROW3
ROW4

COL1

1
4
7

*/T

COL2

2
5
8
0

* This specification are subject to be changed without notice.

COL3

3
6
9
#

COL4/KT

HD

F

RD/P

COL5

EM1
EM2
EM3

ST

9.24.1998

2

FUNCTIONAL BLOCK DIAGRAM

COL1
COL2
COL3

COL4/KT

COL5

Keyboard

interface
(column)

SDO

HFO

HDO

Output circuit

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

RMUTE

Row/Column

programming counter

XMUTE

XIN

XOUT

ROW1

ROW4

I/O circuit

Oscillator

Timing/Control circuit

Keyboard

~

interface

(Row)

VDD

HFI

Memory

Input circuit

HKS

DRING

latch

&

decoder

Pulse

generator

D/A

converter

DTMF

PO

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 Input/Output structure pin. The output is a open drain structure. Input is schmitt trigger

structure. This pin will be input pin during ON-HOOK status for illegal parallel phone
detect input pin and will be output pin in OFF-HOOK condition for control speech
network.

VDD and V

SS

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

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

DTMF The DTMF (Dual Tone Multi-Frequency) and music signals output pin. Normally,

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

2.0Vdc to 5.5Vdc.

handfree function. This pin is hysteresis input structure and built-in pull up resistor
(typically 200 Kohms).

control speakerphone circuit for handfree conversation. When handfree function is
executed, this pin will switch to“High”. Otherwise, this pin stays “Low” level.

this pin stays “Low” level. In Tone dialing mode, this pin will output DTMF signal
that is corresponding to keyboard 0 .. 9, * and # keys.

* This specification are subject to be changed without notice.

9.24.1998

3

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

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.

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 .

NC No connection.

* This specification are subject to be changed without notice.

9.24.1998

4

FUNCTION DESCRIPTIONS

Dialing signal selection

The EM91455 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

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

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.

* This specification are subject to be changed without notice.

9.24.1998

5

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

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 EM91455 series incorporated several sets repertory memory and each one can store number up to 16 digits.
These memories were designed to 3 sets types. 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 3 sets memory

Direct (one-touch) operation

Off-hook (or turn on HF function), push (ST, d1, d2, .. , dn [ST], EMn The numbers d1, d2, .. , dn will be stored
into memory location “EMn”. The “EMn” expressed emergency memory EM1 to EM3.

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 “EMn” key. The numbers that are stored in direct memory location
“EMn” will be dialed out in Pulse or Tone mode as selection. The “n” expressed digital number from 1~3.

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)

* This specification are subject to be changed without notice.

9.24.1998

6

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

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 93 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 EM91455 series. To prevent the unavoidable long distance call, then EM91455 inhibits the key entry during
Tdly.

* This specification are subject to be changed without notice.

9.24.1998

7

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

Operating flow chart

HD

HD

HF

(4)

On-hook

Hand-free State

HF

(6)

On-hook

Hold-line State

HF

HKS=Hi

HKS=Lo

XMUTE

On-hook State

Hand-free State

HKS=Hi

=Hi

(1)

HKS=Lo

(3)

Off-hook

HF

HD

XMUTE=Lo

HKS=Lo

HKS=Hi

HF

HF

HF

(7)

IPP State

HKS=Lo

(2)

Off-hook State

HD

HD

(5)

Off-hook

Hold-line State

<Note> : HF = Handfree

HD = Hold

Truth table

Pin level

Operating state Input I/O Output

HKS XMUTE PO HFO HDO DTMF
(1) On-hook, idle state H H/F F L L ­(2) Off-hook line L H/F F L L ­(3) Off-hook, HF line L H/F F H L ­(4) On-hook, HF line H H/F F H L ­(5) Off-hook, HD line L L/L F L H ­(6) On-hook, HD line H L/L F L H ­(7) IPP state H L/L F H H active

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

XMUTE are I/O port, so Input will effect state situation change, and which state dialer stay will
effect output level.

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 EM32117
). The SDO signal consists of two start bits, six data bits and two stop bits. The 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.

ready

0

start bits

1 bit 0

bit1

* This specification are subject to be changed without notice.

bit2 bit3 bit4 bit5
data bits

0

stop bits

1

9.24.1998

8

∗ 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

F 1 0 1 1 1 1 clear all display

(Lock state) 1 0 0 0 0 1 Lock

EM1~EM3 1 1 1 1 0 0 MEMORY

RD 1 1 1 1 0 1 RD

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

<Note> : The display of LCD panel “ST”,”Hold”,”HF”,”EM1~EM3”,”RD” is corresponding to EM32117
with flag types.

LOCK function

The EM91455 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~nps3 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.

* This specification are subject to be changed without notice.

9.24.1998

9

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

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. If the first

digit is not equal to the lock number then the telephone numbers will be dialed out entirely and use the Flash
key to redial any other number will not check the pass word again.

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

i. 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 ).

I.P.P. DETECT function

The EM91455 series provide the I.P.P. function to pretect illegal connect. I.P.P means Illegal Parallel Phone
Detect. I.P.P. function depend on XMUTE pin and HKS, HF status. When in the ON-HOOK condition and HF
turn off, the XMUTE pin will be a Input pin to detect the voltage lever, otherwises, the XMUTE pin will be a
normally output pin use for control speech network. When I.P.P. function detect. XMUTE pin at "low" status (In
On-Hook and HF turn OFF state), EM91455 will turn on HF and HDO then send alarm signal to telephone line.
In alarm duration DTMF pin will continue sending "#","8" "8" signal. The DTMF signal will interfere the illegal
user until the illegal user hang up the phone and the XMUTE pin detect "high" again. The telephone circuit design
can allow the illegal internal connect user. (see I.P.P Application CIRCUIT).

* This specification are subject to be changed without notice.

9.24.1998

10

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

ABSOLUTE MAXIMUM RATINGS(Ambient temperature is 25 °C, all voltages referenced to V

)

SS

Items Sym. Rating Unit

Power supply voltage V
Input voltage range V
Operating temperature T
Storage temperature T
Power consumption P

DD

IN

OPR

STO

D

VSS-0.3V ~ VDD+0.3V V

6.0 Vdc V

0 ~ 50 °C

-55 ~ 125 °C

500 mW

DC ELECTRICAL CHARACTERISTICS

(Ambient temperature is 25 °C, VDD=2.5V unless otherwise noted, all voltages referenced to VSS, Fosc=3.579545 MHz)

Parameter Sym. Min. Typ. Max. Unit Condition

Operating voltage Pulse 2.0 - 5.5 V unload

Tone 2.0 - 5.5

Operating current(HKS=0) Pulse Idd - 0.15 0.3 mA with pull up/down

Tone - 0.3 0.5 resistor * 8
Memory retention current Imrt - - 0.1 uA HKS=1,Vdd=1V
Standby current HKS=1 Istby - - 0.1 unload

HKS=0 - 1 10 uA

HKS=1 - 0.1 with pull up/down

HKS=0 - 10 30 resistor * 8
HKS, HFI & DRING ViH 0.8V

pins: input voltage ViL V
Xmute pin : Schmitt triggers V
(input pin) V

H-L

L-H

V

0.7V
HFO & HDO pins source current IoH 0.2 - - mA Vo = 2.0 V
PO, HFO, XMUTE, RMUTE IoL -0.2 - - mA Vo = 0.5 V
& SDO pins: sink current
PO, XMUTE, RMUTE and SDO IoH - - 0.01 uA Vo = Vdd
pins: leakage current
HFI pin input resistance Rhfi - 200 - KΩ Vhfi = Vss
Keyboard scanning pins IoH 2 10 50 uA Vksn=Vss
output current (except COL4/KT) IoL 200 400 800 µA ksn=Vdd
COL4/KT source current IoH 0.2 - - mA Vo=2.0V

sink current IoL 0.2 - - Vo=0.5V
DTMF pin: sink current IoL -0.2 - - mA 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 1 2 3 dB Column - Row

○○○○○○○○○○○○○○○○○○○○

distortion THD - -30 -23 dB ZL = 5 KΩ

○○○○○○○○○○○○○○○○○○○○

load resistance ZL 5 - - KΩ THD < − 23dB

2

2

Distortion(dB)=20 log {[V

+V

1

2

+V

..... +V

2

3

VL, VH =ROW group and column group signal.

V1, V2, V3 .... Vn = Harmonic signal (BW=300Hz~3500Hz)

2

)1/2]/[(V

n

L

-VDDV

DD

- 0.2V

SS

- 0.3V

SS

-VDDV

DD

2

2

+V

)1/2]}

H

DD

V at idle state

DD

* This specification are subject to be changed without notice.

9.24.1998

11

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

AC ELECTRICAL CHARACTERISTIC

(Ambient temperature is 25°C, V

Parameter Sym. Min. Typ. Max. Unit Condition

Keyboard debounce time Tdb - 20 - ms
Key tone signal: frequency Fkt - 600 - Hz

duration Tkt - 30 - ms
Pause time Tp - 3.6 - sec.
Pulse to Tone waiting time Tpt - 3.6 - sec.
Flash time Tf - 600 - Row3B, Row4B=NR, NR

Pulse rate PSR - 20 - pps Row1 = R-Vdd

Make/Break ratio MBR - 40:60 - % Row2 = NR

Inter-digit pause time Tidp - 800 - ms PSR = 10 pps

Minimum tone duration Tp 96 98 100
Minimum inter-tone pause Titp 96 98 100 ms Memory dialing
HD key release hold function Thdrdb - 93 - ms
debounce time
SDO bit time Tbit 3.8 3.9 4.1 ms
Off-Hook delay time Tdly - 300 - ms

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

DD

- 100 - ms Row3B, Row4B=NR, R-Vss

- 80 - Row3B,Row4B=R-Vss, NR

- 300 - Row3B,Row4B=R-Vss,R-Vss

- 10 - Row1 = R-Vss

- 33:66 - Row2 = R-Vss

- 500 - PSR = 20 pps

DTMF output frequency (fosc = 3.579545 MHz)

Keyboard scan pin CCITT standard (Hz) Actual output (Hz) Deviation (%)

ROW1 (f1) 697 699.1 0.30
ROW2 (f2) 770 766.2 0.49
ROW3 (f3) 852 847.4 -0.53
ROW4 (f4) 941 947.9 0.73
COL1 (f5) 1209 1215.8 0.56
COL2 (f6) 1336 1331.6 -0.32
COL3 (f7) 1477 1471.8 -0.35

* This specification are subject to be changed without notice.

9.24.1998

12

TIMING DIAGRAM

HKS

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

KEY IN

KT

XMUTE

SDO

PO

DTMF

OSC.

Tdb

2

Tdly

3

Tkt

Tm

Tidp T

T

TbT

m

b

m

Figure 1. Pulse mode operating timing

Tidp

Hi-impedance

HKS

KEY IN

KT

XMUTE

SDO

PO

DTMF

OSC.

2

Tdb

Td

Titp

Figure 2. DTMF mode operating timing

3

Titp

Hi-impedance

* This specification are subject to be changed without notice.

9.24.1998

13

LNB=2,3

HKS

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

KEY IN

KT

XMUTE

SDO

PO

DTMF

OSC.

LNB=2,3

Tdb

Tdly

RD/P

Tkt

Tm

Tidp

TbT

TbT

m

m

Tidp

Figure 3. Pulse mode LNB redial timing

Hi-impedance

HKS

KEY IN

Tdb

KT

XMUTE

SDO

PO

DTMF

OSC.

RD/P

Tkt

Td

Titp

Tdly

Figure 4. DTMF mode LNB redial timing

* This specification are subject to be changed without notice.

Td

Titp

Hi-impedance

9.24.1998

14

HKS

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

KEY IN

XMUTE

HKS

KEY IN

KT

XMUTE

KT

SDO

PO

DTMF

OSC.

2

Tidp

RD/P 3

Tp

Figure 5. Pause key operating timing

2 */T

34

Tpt

Tidp

Hi-impedance

SDO

PO

DTMF

OSC.

HKS

KEY IN

KT

XMUTE

SDO

PO

DTMF

Tdb

Figure 6. Pulse to Tone (P→T) operating timing

F

Tf

Tfp=300ms

Hi-impedance

OSC.

Figure 7. Flash key operating timing

* This specification are subject to be changed without notice.

Hi-impedance

9.24.1998

15

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

HKS

KEY IN

KT

SDO

Tdb

SB

0

b0

SB

0

0

1

L

2

b2 b3 b4

b1

Tbit

0000

1

b5 SPB

0

M

SPB

1

<Note>L=Least significant bit,M=Most significant bit, SB=START bit , SPT=STOP bit

Figure 8. SDO operating timing

HKS

EM91455 SERIES

Hi-impedance

KEY IN

HFO

HDO

XMUTE

SDO

PO

MELODY

HF

HD

HF

HD

HD HD HD HD @

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

Figure 9. HF and HD operating timing

HFI

or

HKS

KEY

HF

5

0

HF

93

ms

Hi-impedance

Thdrdb

KT

OSC.

SDO

Tdly

Figure 10. Off-Hook delay time

* This specification are subject to be changed without notice.

"0" digit dialing time

Hi-impedance

9.24.1998

16

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

Toff

RING

Ton

DRING

HKS

RMUTE

Figure 11. Timing of receiving an incoming call

* The external ring detection circuit must send a low signal at the total ring cycle (Ton and Toff)

EM91455 SERIES

RING

DRING

HKS

RMUTE

Figure 12. Timing of making an outgoing call

* This specification are subject to be changed without notice.

9.24.1998

17

TONE/PULSE DIALER WITH LCD INTERFACE

ILLEGAL CONNECT EXTERNAL PHONE DETECT CIRCUIT

ON

OFF

SW2: ON : Enable IPP detect

OFF : Disable

Tip

Ring

Tip'

Ring'

NETWORK

AND

HOLD

DRIVER

OFF-HOOK

ON-HOOK

KEYBORAD

LCD

SPEECH

VDD

VDD

VDD

VDD

VDD

HOOK-SW

470u

+

16V

BRIDGE

-+

BRIDGE

-+

1N4148

1N4148

1N4148

1N4148

1N4148

PC817

47K

100

100K

1M

4.7M

22M

2K2

1N4148

SW2

100K

47K

3K3

A92

1N4148

3.58M

0.1u 0.1u

220K

0.1u

10M

47K

4V7

100K

100K

0.1u

470K

C945

A42

BRIDGE

-+

470

0.1u

PC817

1.2M

1u

27V

0.22u/50V

4K7

1K5

50

1815

1815

0.001u

0.01u

HF

BUZZER

EM91455DK

NC

1

COL5

2

KT/COL4

3

COL3

4

COL2

5

COL1

6

XIN

7

XOUT

8

XMUTE

9

VSS

10

HFI

11

DRING

12

RMUTE

13

HFO

14

DTMF

15

VDD

16

HKS

17

ROW1

18

ROW2

19

ROW3

20

ROW4

21

PO

22

HDO

23

SDO

24

HFO

HDO

PO

HFO

HDO

PO

DRING

DRING

RMUTE

XMUTE

SCAN

LINE

SDO

HK

LINE

LINE

APPLICATION CIRCUIT : CONTROL AND IPP DETECT

EM91455 SERIES

AND I.P.P. DETECT FUNCTION

* This specification are subject to be changed without notice.

9.24.1998

18

APPLICATION CIRCUIT : KEY BOARD AND HOLD

2

3

HD

EM1

4

56

F

EM2

7

89

EM3

*/T 0

#

RD/P

ST

R-option

1

Typical Resistor value are 560K

AUTOMATICALLY HOLD

RELEASE CIRCUIT

For more detail please reference R-option section

VDD

VDD

FLASH TIME

MBR

MODE

LOCK NUMBER

LOCK

C945

C945

47u

0.1u

220K

47K

22K

1u

47K

SCAN

COL5

COL4

COL3

COL2

COL1

ROW1

ROW2

ROW3

ROW4

ROW1

COL4/KT

LINE

HDO

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

* This specification are subject to be changed without notice.

9.24.1998

19

TONE/PULSE DIALER WITH LCD INTERFACE

APPLICATION CIRCUIT : LCD DRIVER USE EM32117

GF

VDD

EM91455 SERIES

AND I.P.P. DETECT FUNCTION

SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8

SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23

LCD PANEL

SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31

COM0
COM1
COM2
COM3

8

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
58

SEG9

SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26

SEG2757SEG2856SEG2955SEG3054SEG3153COM052COM151COM250COM3

EM32117

SEG2

SEG1

49

18

19

FG

TEST

SEG0

SPARE1
SPARE2

XOUT

ENCLND48ENRTC4724/12

46

MS1
MS2

SDI
HKS
VDD

V2

V3
VC1
VC2

VSS

XIN

17

16

15

14

13

12

11

10

9

TEST

MS2

27
28
29
30
31

SDI

32
33
34
35
36
37
38
39
40

VDD

HKS

0.1u

0.1u

0.1u

MS1

32768

VDD

VDD

CALENDAR

VDD

EXTRA

1.5V BATTERY

HKS

C945

C945

C945

1M

DIALER

PART VDD

EM32117 can used this cricuit replace

extra battery .

RECOMMAND CRICUIT :

( But if LCD PANEL's power consumption

are too large , the extra battery still be

needed. )

* This specification are subject to be changed without notice.

RTC

C945

HK

470K

1N4148

VDD

HOUR

SDI

SDO

HOUR JUMP : 24/12 format select

CALENDAR JUMP : CALENDAR ON/OFF

MS1 ,MS2 adjust Time

RTC JUMP : Real Time Clock ON/OFF

GF JUMP : General Flag icon for LOGO ON/OFF

NOTED :

9.24.1998

20

TONE/PULSE DIALER WITH LCD INTERFACE

APPLICATION CIRCUIT : LCD DRIVER USE EM32100

46

45

44

41

COM3
COM2
COM1
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8

SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24

LCD PANEL

36
35
34
33
32
31
30
29
28
27
26
25

SEG6
SEG7
SEG8
SEG9
NC
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16

SEG537SEG438SEG339SEG240SEG1

SEG2021SEG2120SEG2219SEG2318SEG2417VEE16VN

SEG19

SEG18

SEG17

22

23

24

COM142COM243COM3

EM32100

TEST2

15

TEST1

47

14

F32H

VP

48

NC

XOUT

24/12

ENRTC

NC

13

MS1
MS2

SDI
HKS
VDD

XIN

NC

VSS

NC

1
2
3
4
5
6
7
8
9
10
11
12

EM91455 SERIES

AND I.P.P. DETECT FUNCTION

TEST AND F32H

MS2

SDI

VDD

HKS

20p20p

32768

MS1

VDD

EXTRA

1.5V BATTERY

VDD

220K

HKS

C945

1N4148

330K

47K

1N4148

1N4148

0.1u

0.1u

VDD

RTC

SDI

VDD

HOUR

MS1 ,MS2 adjust Time

RTC JUMP : Real Time Clock ON/OFF

HOUR JUMP : 24/12 format select

HK

* This specification are subject to be changed without notice.

HDO

** EM32100 need HDO and HFO **

HFO

SDO

NOTED :

9.24.1998

21

PACKAGE INFORMATION

Example :

EM 91455 P
(1) (2) (3)

18/20/28 Lead Plastic Package

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

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

P→PDIP
K→Skinny
R→SDIP

E1

E

eB

18 PDIP

MILIMETERS INCHES

DIM MIN. MAX. MIN. MAX.

A - 5.334 - .210

A1 0.381 - .015 -

B 0.356 0.558 .014 .022

B1 1.150 1.778 .045 .070

C 0.204 0.381 .008 .015
D 22.35 23.37 .880 .920
E 7.620 8.255 .300 .325

E1 6.096 7.112 .240 .280

e 2.286 2.794 .090 .110

eB - 10.92 - .430

L 2.921 4.064 .115 .160

1

C

B

e

20 PDIP

MILIMETERS INCHES

DIM MIN. MAX. MIN. MAX.

A - 5.334 - .210

A1 0.381 - .015 -

B 0.356 0.558 .014 .022

B1 1.150 1.778 .045 .070

C 0.204 0.381 .008 .015

D 25.40 26.67 1.000 1.050

E 7.620 8.255 .300 .325

E1 6.096 7.112 .240 .280

e 2.286 2.794 .090 .110

eB - 10.92 - .430

L 2.921 4.064 .115 .160

D

A

A1

L

B1

28 PDIP

MILIMETERS INCHES

DIM MIN. MAX. MIN. MAX.

A - 6.350 - .250

A1 0.381 - .015 -

B 0.356 0.558 .014 .022

B1 1.016 1.778 .040 .070

C 0.204 0.381 .008 .015
D 35.56 37.85 1.400 1.490
E 15.24 15.88 .600 .625

E1 13.21 14.73 .520 .580

e 2.286 2.794 .090 .110

eB - 17.78 - .700

L 2.921 5.080 .115 .200

* This specification are subject to be changed without notice.

9.24.1998

22

22/24 Lead Plastic Package-Skinny

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

E1

1

E

C

B

eB

22 PDIP (skinny)

MILIMETERS INCHES

DIM MIN. MAX. MIN. MAX.

A - 4.752 - .180
A1 0.381 - .015 ­B 0.356 0.558 .014 .022
B1 1.27 1.778 .050 .070
C 0.204 3.556 .008 .014
D 25.90 26.67 1.02 1.05
E 7.620 8.255 .300 .325
E1 6.223 6.604 .245 .260
e 2.286 2.794 .090 .110
eB 8.382 10.16 .330 .400
L 2.921 4.064 .115 .160

D

A

A1

e

B1

L

24 PDIP (skinny)

MILIMETERS INCHES

DIM MIN. MAX. MIN. MAX.

A - 4.572 - .180
A1 0.381 - .015 ­B 0.356 0.558 .014 .022
B1 1.27 1.778 .050 .070
C 0.204 0.381 .008 .015
D 31.24 32.26 1.23 1.270
E 7.620 8.255 .300 .325
E1 6.223 6.731 .245 .265
e 2.286 2.794 .090 .110
eB 8.636 9.652 .340 .380
L 2.921 4.064 .115 .160

* This specification are subject to be changed without notice.

9.24.1998

23

42 SDIP Package

EM91455 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

E1

E

C

D1

eB

B

e

B1

D

A2

A

A1

L

42 SDIP

MILIMETERS INCHES

DIM MIN. MAX. MIN. MAX.

A - 5.08 - 0.200
A1 0.381 - 0.015 ­A2 3.937 4.191 0.155 0.165
B 0.356 0.559 0.014 0.022
B1 0.914 1.116 0.036 0.044
C 0.204 0.304 0.008 0.012
D 36.70 37.34 1.445 1.470
E1 13.84 14.10 0.545 0.555
e 1.727 1.829 0.068 0.072
eB 15.24 17.78 0.600 0.70
D1 0 0.127 0 0.005
L 2.921 3.429 0.115 0.135

* This specification are subject to be changed without notice.

9.24.1998

24