ELAN EM91450DK, EM91450CP, EM91450BP, EM91450AP Datasheet

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.