Datasheet EM91450DK, EM91450CP, EM91450BP, EM91450AP Datasheet (ELAN)

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

1

* This specification are subject to be changed without notice.

2.10.1999

GENERAL DESCRIPTION

The EM91450 is a series of tone/pulse switchable dialers that is composed of T/P dialer. The EM91465 provide
modern LCD driver's series data output port, which can display modern function operating icons. The
EM91450 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 EM91450 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.

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.

• 13 set one touch or (3 set one touch and 10 set two 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
EM91450A √√ √ √
EM91450B √√ √ √ √
EM91450C √√ √ √ √ √ √
EM91450D √√ √ √ √ √ √ √
Note : PDP = Pocket Dialer Prevented

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

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

2

* This specification are subject to be changed without notice.

2.10.1999

EM91450

Pin Assignment

Keyboard Arrangement

COL4/KT

COL3
COL2
COL1

XIN

XOUT

XMUTE

VSS

1
2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

PO
ROW4
ROW3
ROW2
ROW1
HKS
VDD
DTMF

EM91450AP

COL4/KT

COL3
COL2
COL1

XIN

XOUT

XMUTE

VSS

HFI

1
2
3
4
5
6
7
8
9

18
17
16
15
14
13
12
11
10

PO
ROW4
ROW3
ROW2
ROW1
HKS
VDD
DTMF
HFO

EM91450BP

SDO

COL4/KT

COL3
COL2
COL1

XIN

XOUT

XMUTE

VSS

HFI

1
2
3
4
5
6
7
8
9

10

20
19
18
17
16
15
14
13
12
11

HDO
PO
ROW4
ROW3
ROW2
ROW1
HKS
VDD
DTMF
HFO

EM91450CP

SDO

COL4/KT

COL3
COL2
COL1

XIN

XOUT

XMUTE

VSS

HFI

DRING

1
2
3
4
5
6
7
8

9
10
11

22
21
20
19
18
17
16
15
14
13
12

HDO
PO
ROW4
ROW3
ROW2
ROW1
HKS
VDD
DTMF
HFO
RMUTE

EM91450DK

ROW1
ROW2
ROW3
ROW4

COL1

1
4
7

*/T

COL2

2
5
8
0

COL3

3
6
9
#

COL4/KT

HD

F

RD/P

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

3

* This specification are subject to be changed without notice.

2.10.1999

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 ÒHigh impedanceÓ level to prevent power consumption. Otherwise,
these pins switch to ÒHighÓ level for detecting keyboard entry. These pins will output
600 Hz signal while keyboard is scanning.

COL1~COL3 Keyboard scan pins of column group. In idle state, these pins stay "High impedance"

level. Otherwise these pins switch to ÒLowÓ 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

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.

FUNCTIONAL BLOCK DIAGRAM

COL1
COL2
COL3

COL4/KT

XIN

XOUT

ROW1

ROW4

HFO

HDO

XMUTE

Keyboard

interface

(column)

Oscillator

Keyboard

interface

(Row)

Output circuit

Memory

Timing/Control circuit

Input circuit

Pulse

generator

latch

&

decoder

D/A

converter

Row/Column

programming counter

DTMF

PO

HKS

HFI

VDD

DRING

RMUTE

SDO

~

I/O circuit

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

4

* This specification are subject to be changed without notice.

2.10.1999

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 .

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

5

* This specification are subject to be changed without notice.

2.10.1999

FUNCTION DESCRIPTIONS

Dialing signal selection

The EM91450 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.

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

6

* This specification are subject to be changed without notice.

2.10.1999

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)

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.

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.

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.

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

7

* This specification are subject to be changed without notice.

2.10.1999

Operating flow chart

<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.

• 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
EM91450 series. To prevent the unavoidable long distance call, then EM91450 inhibits the key entry during
Tdly.

(1)

On-hook State

(7)

IPP State

(2)

Off-hook State

(4)

On-hook

Hand-free State

HKS=Lo

HKS=Lo

HKS=Lo

HKS=Hi

HF

HF

=Hi

HF

HD

HF

HD

(6)

On-hook

Hold-line State

(3)

Off-hook

Hand-free State

HF

HF

HF

HD

HKS=Hi

HKS=Lo

(5)

Off-hook

Hold-line State

HD

HD

HKS=Hi

XMUTE

XMUTE=Lo

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

8

* This specification are subject to be changed without notice.

2.10.1999

∗ 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

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

RD 1 1 1 1 0 1 RD

LOCK function

The EM91450 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.

0

1 bit 0

bit1

bit2 bit3 bit4 bit5

ready

start bits

data bits

0

1

stop bits

<Note> : The display of LCD panel "Hold","HF","RD" is corresponding to EM32117 with flag types.

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.

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

9

* This specification are subject to be changed without notice.

2.10.1999

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 ).

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
or flash. 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
or flash. 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

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.

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

10

* This specification are subject to be changed without notice.

2.10.1999

I.P.P. DETECT function

The EM91450 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), EM91450 will turn on HF and 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 legal internal connect user. (see I.P.P Application CIRCUIT).

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

11

* This specification are subject to be changed without notice.

2.10.1999

DC ELECTRICAL CHARACTERISTICS

(Ambient temperature is 25 oC, 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

DD

-VDDV

pins: input voltage ViL V

SS

- 0.2V

DD

Xmute pin : Schmitt triggers V

H-L

V

SS

- 0.1VDDV at idle state

(input pin) V

L-H

0.9V

DD

-VDDV
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/KTsource 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 d B Column - Row
distortion THD - -30 -23 dB ZL = 5 K Ω
load resistance ZL 5 - - KΩ THD < − 23dB

ABSOLUTE MAXIMUM RATINGS(Ambient temperature is 25

o

C, all voltages referenced to VSS)

Items Sym. Rating Unit

Power supply voltage V

DD

6.0 Vdc V

Input voltage range V

IN

VSS-0.3V ~ VDD+0.3V V

Operating temperature T

OPR

0 ~ 50

o

C

Storage temperature T

STO

-55 ~ 125

o

C

Power consumption P

D

500 m W

○○○○○○○○○○○○○○○○○○○○

○○○○○○○○○○○○○○○○○○○○

○○○○○○○○○○○○○○○○○○○○

Distortion(dB)=20 log {[V

1

2

+V

2

2

+V

3

2

..... +V

n

2

)1/2]/[(V

L

2

+V

H

2

)1/2]}
VL, VH =ROW group and column group signal.

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

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

12

* This specification are subject to be changed without notice.

2.10.1999

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

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

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

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

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

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

- 10 - Row1 = R-Vss

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

- 33:66 - Row2 = R-Vss

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

- 500 - PSR = 20 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

Parameter Sym. Min. Typ. Max. Unit Condition

AC ELECTRICAL CHARACTERISTIC

(Ambient temperature is 25

o

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

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

13

* This specification are subject to be changed without notice.

2.10.1999

TIMING DIAGRAM

Figure 1. Pulse mode operating timing

Figure 2. DTMF mode operating timing

HKS

KEY IN

KT

XMUTE

SDO

PO

DTMF

OSC.

Tdb

Tkt

2

3

Tm

Tidp T

b

T

m

TbT

m

Tidp

Tdly

Hi-impedance

HKS

KEY IN

KT

XMUTE

SDO

PO

DTMF

OSC.

Tdb

2

3

Td

Titp

Titp

Hi-impedance

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

14

* This specification are subject to be changed without notice.

2.10.1999

Figure 3. Pulse mode LNB redial timing

Figure 4. DTMF mode LNB redial timing

HKS

KEY IN

KT

XMUTE

SDO

PO

DTMF

OSC.

Tdb

Tkt

RD/P

Tm

Tidp

TbT

m

TbT

m

Tidp

Tdly

LNB=2,3

Hi-impedance

HKS

KEY IN

KT

XMUTE

SDO

PO

DTMF

OSC.

Tdb

Tkt

RD/P

Td

Tdly

Hi-impedance

LNB=2,3

Td

Titp

Titp

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

15

* This specification are subject to be changed without notice.

2.10.1999

HKS

KEY IN

KT

XMUTE

SDO

PO

DTMF

OSC.

Tdb

Tf

Tfp=300ms

Hi-impedance

F

Tpt

PO

HKS

KEY IN

KT

XMUTE

SDO

DTMF

OSC.

2 */T

34

Hi-impedance

Tidp

Tidp

Tp

2

RD/P 3

HKS

KEY IN

KT

XMUTE

SDO

PO

DTMF

OSC.

Hi-impedance

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

Figure 5. Pause key operating timing

Figure 7. Flash key operating timing

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

16

* This specification are subject to be changed without notice.

2.10.1999

Figure 8. SDO operating timing

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

Figure 10. Off-Hook delay time

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

Figure 9. HF and HD operating timing

HKS

KEY IN

KT

SDO

Tdb

2

SB

SB

b0

b1

b2 b3 b4

b5 SPB

SPB

0

1

0

1

0000

0

1

Tbit

L

M

Hi-impedance

0

Tdly

"0" digit dialing time

0

5

HF

HFI

or

HKS

KEY

KT

OSC.

SDO

Hi-impedance

HF

HD

HF

HD

HF

HD HD HD HD @

93

ms

Thdrdb

HKS

KEY IN

HFO

HDO

XMUTE

SDO

PO

MELODY

Hi-impedance

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

17

* This specification are subject to be changed without notice.

2.10.1999

Figure 11. Timing of receiving an incoming call

Figure 12. Timing of making an outgoing call

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

RING

DRING

HKS

RMUTE

Toff

Ton

RING

DRING

HKS

RMUTE

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

18

* This specification are subject to be changed without notice.

2.10.1999

APPLICATION CIRCUIT : CONTROL AND IPP DETECT

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

EM91450DK

SDO

1

KT/COL4

2

COL3

3

COL2

4

COL1

5

XIN

6

XOUT

7

XMUTE

8

VSS

9

HFI

10

DRING

11

RMUTE

12

HFO

13

DTMF

14

VDD

15

HKS

16

ROW1

17

ROW2

18

ROW3

19

ROW4

20

PO

21

HDO

22

HFO

HDO

PO

HFO

HDO

PO

DRING

DRING

RMUTE

XMUTE

SCAN

LINE

HK

LINE

LINE

SDO

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

19

* This specification are subject to be changed without notice.

2.10.1999

APPLICATION CIRCUIT : KEY BOARD AND HOLD

2

3

HD

4

56

F

7

89

*/T 0

#

RD/P

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

ROW1

COL4/KT

LINE

HDO

ROW2

SCAN

ROW1

ROW4

COL2

COL4

ROW3

COL1

COL3

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

20

* This specification are subject to be changed without notice.

2.10.1999

APPLICATION CIRCUIT : LCD DRIVER USE EM32117

PART VDD

EXTRA

RECOMMAND CRICUIT :

EM32117 can used this cricuit replace

extra battery .

( But if LCD PANEL's power consumption

are too large , the extra battery still be

needed. )

NOTED :

MS1 ,MS2 adjust Time

GF JUMP : General Flag icon for LOGO ON/OFF

CALENDAR JUMP : CALENDAR ON/OFF

RTC JUMP : Real Time Clock ON/OFF

HOUR JUMP : 24/12 format select

VDD

VDD

VDD

VDD

LCD PANEL

COM0

33

COM1

34

COM2

35

SEG2

3

SEG3

4

SEG4

5

SEG5

6

SEG6

7

SEG7

8

SEG8

9

SEG9

10

SEG10

11

SEG11

12

SEG12

13

SEG13

14

SEG14

15

SEG15

16

SEG16

17

SEG17

18

SEG18

19

SEG19

20

SEG20

21

SEG21

22

SEG22

23

SEG23

24

SEG24

25

SEG25

26

SEG26

27

SEG27

28

SEG28

29

SEG29

30

SEG30

31

SEG31

32

COM3

36

SEG0

1

SEG1

2

1N4148

C945

470K

MS2

0.1u

0.1u

0.1u

32768

MS1

EM32117

SEG12

78

SEG13

77

SEG14

76

SEG15

75

SEG16

74

SEG17

73

SEG18

72

SEG19

71

SEG20

70

SEG21

69

SEG22

68

SEG23

67

SEG24

66

SEG25

65

SEG26

58

SEG2757SEG2856SEG2955SEG3054SEG3153COM052COM151COM250COM3

49

VC1

36

MS1

27

VC2

37

VSS

38

XIN

39

HKS

32

SEG0

17

SEG1

16

SEG2

15

SEG3

14

SEG4

13

SEG5

12

SEG6

11

SEG7

10

SEG8

9

SEG9

8

SEG10

80

SEG11

79

V3

35

V2

34

MS2

28

SPARE2

30

SDI

31

VDD

33

XOUT

40

FG

18

ENCLND48ENRTC4724/12

46

TEST

19

SPARE1

29

CALENDAR

RTC

HOUR

GF

C945

C945

C945

1M

1.5V BATTERY

SDO

HK

VDD

HKS

SDI

HKS

SDI

TEST

VDD

DIALER

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

21

* This specification are subject to be changed without notice.

2.10.1999

APPLICATION CIRCUIT : LCD DRIVER USE EM32100

NOTED :

MS1 ,MS2 adjust Time

RTC JUMP : Real Time Clock ON/OFF

HOUR JUMP : 24/12 format select

EXTRA

** EM32100 need HDO and HFO **

VDD

VDD

VDD

1N4148

C945

47K

MS2

20p20p

0.1u

32768

MS1

RTC

HOUR

0.1u

220K

1N4148

1N4148

EM32100

SEG9

33

SEG8

34

SEG7

35

SEG6

36

SEG537SEG438SEG339SEG240SEG1

41

TEST1

46

F32H

47

MS1

1

MS2

2

SDI

3

HKS

4

VDD

5

VP

14

VSS

9

XIN

6

SEG2021SEG2120SEG2219SEG2318SEG2417VEE16VN

15

ENRTC

11

24/12

10

XOUT

8

SEG19

22

SEG18

23

SEG17

24

SEG16

25

SEG15

26

SEG14

27

SEG13

28

SEG12

29

SEG11

30

SEG10

31

NC

32

NC

7

NC

12

NC

13

COM142COM243COM3

44

TEST2

45

NC

48

1.5V BATTERY

330K

LCD PANEL

COM3
COM2
COM1

SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8

SEG9
SEG10
SEG11
SEG12

SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24

SEG13

SDO

HDO

HKS

SDI

HKS

SDI

TEST AND F32H

HK

HFO

VDD

VDD

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

22

* This specification are subject to be changed without notice.

2.10.1999

Example :

EM 91450 P
(1) (2) (3)

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

P→PDIP
K→Skinny
R→SDIP

PACKAGE INFORMATION

18/20/28 Lead Plastic Package

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

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

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

B

C

eB

D

E1

B1

A1

e

L

A

E

1

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

23

* This specification are subject to be changed without notice.

2.10.1999

22/24 Lead Plastic Package-Skinny

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

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

B

C

eB

D

E1

B1

A1

e

L

A

E

1

EM91450 SERIES

TONE/PULSE DIALER WITH LCD INTERFACE

AND I.P.P. DETECT FUNCTION

24

* This specification are subject to be changed without notice.

2.10.1999

42 SDIP Package

B

D1

C

eB

D

B1

A1

e

L

A

A2

E

E1

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