ELAN EM91215CK, EM91215BP, EM91215AP Datasheet

GENERAL DESCRIPTION

The EM91215 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with 13
set memories. The EM91215 series provides necessary functions of telephone set for application in any
environment, such as Pulse dialing, Tone (DTMF) dialing, Handfree dialing, keying tone , mute and pulse mute
functions. Beside this, SDO (Serial Data Output) functions is provided in advance version that 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, Pause time, P-T wait time and keyboard type.

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

•Handfree function provides on-hook dialing and speakerphone application.

•13 set one touch or (3 set one touch and 10 set two touch) repertory memory, each one can store data up to
16 digits.

•A 32-digit LNB (last number) redial memory.

•A 32-digit SAVE redial memory.

•Keytone function provides rapidly keying recognition.

•Pulse mute function supports pulse dialing application.

•Using 3.579545 MHz crystal or ceramic resonator.

•Package forms: PDIP , skinny.

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

EM91215 SERIES

ORDERING INFORMATION

Versions list

VERSION LNB KT SAVE HF SDO(LCD) PMUTE
EM91215A √√√ √
EM91215B √√√ √ √
EM91215C √√√ √ √ √

* This specification are subject to be changed without notice.

10.1.1997

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EM91215

Pin Assignment

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

EM91215AP

COL5

COL4/KT

COL3
COL2
COL1

XIN

XOUT

XMUTE

VSS

1
2
3
4
5
6
7
8
9

PM

17

PO

16

ROW4

15

ROW3

14

ROW2

13

ROW1

12

HKS

11

VDD

10

DTMF

18

EM91215CK

ROW6

COL5

COL4/KT

COL3
COL2
COL1

XIN

XOUT

XMUTE

VSS

HFI

22

1

21

2

20

3

19

4

18

5

17

6

16

7

15

8

14

9

13

10

12

11

Keyboard Arrangement

Type A Type B

M4
M9

COL5

EM1
EM2

F

EM3

A

ST
M5

M10

ROW5/SDO

ROW1
ROW2
ROW3
ROW4

ROW5/SDO

ROW6

COL1

1
4

7
*/T
M1
M6

COL2

2
5
8

0
M2
M7

COL3

3
6
9

#
M3
M8

COL4/KT

SAVE

RD/P

ROW5/SDO
PM
PO
ROW4
ROW3
ROW2
ROW1
HKS
VDD
DTMF
HFO

ROW1
ROW2
ROW3
ROW4

ROW6

COL1

1
4
7

*
M1
M6

EM91215BP

COL5

COL4/KT

COL3
COL2
COL1

XIN

XOUT

XMUTE

VSS

HFI

COL2

2
5
8

0
M2
M7

20

1
2
3
4
5
6
7
8
9

10

COL3

M3
M8

PM

19

PO

18

ROW4

17

ROW3

16

ROW2

15

ROW1

14

HKS

13

VDD

12

DTMF

11

HFO

M4
M9

COL5

EM1
EM2

F

EM3

A

ST
M5

M10

COL4/KT

P→T

3
6
9

RD/P

#

@When ROW5 is selected by R option (COL5), there are 13 sets one touch memory version in EM91215C

provided.

FUNCTIONAL BLOCK DIAGRAM

HFO

SDO

COL1
COL2
COL3

COL4/KT

COL5

XIN

XOUT

ROW1

ROW6

Keyboard

interface

(column)

Oscillator

Keyboard

~

interface

(Row)

VDD

* This specification are subject to be changed without notice.

PM

Output circuit

Memory

(Melody)

Timing/Control circuit

Input circuit

HKS HFI

XMUTE

latch

decoder

generator

VDD

Row/Column

programming counter

&

D/A

converter

Pulse

DTMF

PO

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EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

PIN DESCRIPTIONS

Symbol Function

ROW1~ROW6 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. While DTMF output, the key tone will be disabled. 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.
Otherwise, this pin stays “High impedance” level.

V

and V

DD

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) output pin. Normally, this pin stays“Low”

HKS Control signal inputs pin that is corresponding hook switch status. When handset was

PO Pulse signal outputs pin that is NMOS open-drain output structure. Normally, this pin

PM Pulse signal outputs pin that is CMOS inverter output structure. Normally, this pin

SDO SDO function output that is NMOS open-drain structure. When there is a valid entry

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.

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

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.

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.

stays “Low” level. During pulse signal dialing or flash function executing, this pin will
switch to “High” level to control the external circuit.

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.

* This specification are subject to be changed without notice.

10.1.1997

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FUNCTION DESCRIPTIONS

Dialing signal selection

The EM91215 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. DTMF signal

ROW3 ROW4 Tf (ms) COL1 Td (ms) Titp (ms)

NR NR 600 R-Vdd 90 90

NR R-Vss 100 NR 98 98
R-Vss NR 80 R-Vss 83 83
R-Vss R-Vss 300

e. Pause time and P-T wait time f. Keyboard operate type

COL2 Tp (sec) Tpt (ms) COL3 Type

NR 3.6 3.6 NR A
R-Vss 2.0 2.0 R-Vss B

g. ROW5/SDO pin functions

COL5 ROW5/SDO pin

NR SDO

R-Vss ROW5

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

(Note): The option of COL5 pin is only for EM91215.

If select SDO function, the memory type is
(1T*3+2T*10)
If select ROW5 function, the memory type is
(1T*3+2T*10) and (1T*13)

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.

Redialing:

After normal dialing, directly keying
numbers that are stored into LNB memory will be dialed output.

* This specification are subject to be changed without notice.

F key (or On-Off hook once) and keying RD key on keyboard. The

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EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

SAVE redial memory

The SAVE meomry is designed in EM91215 series to support 32 digits capacity buffer for second redial,
pager, Memory and other system applications.

Storing : EM91215 series support two operating methods to store numbers into SAVE redial memory.

Method 1

• To select Pulse or Tone mode.

• Off-hook (or turn on HF function), push

d1, d2, .. , dn. The numbers d1, d2, .. , dn will be dialed out in Pulse

or Tone mode as selection.

• After dn had been dialed out and push

[ST], Save key. If the keying numbers are more than 32 digits that
content of SAVE memory can not be updated. Otherwise, these numbers will be stored into SAVE memory.
In the [] key allows to be omitted.

Method 2

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

Dialing :

• To select Pulse or Tone mode.

• Off-hook (or turn on HF function), push Save key. The numbers stored in SAVE memory will be dialed out
in Pulse or Tone mode as selection.

Repertory memory

The EM91215 series incorporated several sets repertory memory and each one can store number up to 16 digits.

These memories were designed to 13 sets types. As operating precedure, all of the memories can be separated
to dirtect (one-touch) and indirect (two-touch ) operation. 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 13 sets memory types

Direct (one-touch) operation

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

Indirect (two-touch) operation

Off-hook (or turn on HF function), push ST, d1, d2, .. , dn, ST, n. The numbers d1, d2, .. , dn will be stored
into memory location “n”. The “n” expressed digital key from 0 to 9.

ST, d1, d2, .. , dn [ST], EMn or M1~M10 (ROW5 optioned). The

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

Mn (or EMn) key. The numbers that are stored in direct memory

location “Mn (or EMn)” will be dialed out in Pulse or Tone mode as selection. The “n” expressed digital

* This specification are subject to be changed without notice.

10.1.1997

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EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

number from 1~10 decided by dialers’ memory sets.

Indirect (two-touch) memory

• To select Pulse or Tone mode.

• Off-hook (or Turn on HF function), push A, n key. The numbers that are stored in indirect memory location
“n” will be dialed out in Pulse or Tone mode as selection. The “n” expressed digital key from 0 to 9.

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
out as following sequence:

d1, d2, .. , dn, Tp, k1, k2, .. , kn.

d1, d2, .. , dn, RD/P, k1, k2, .. , kn . These numbers will be dialed

Pulse to Tone (*/T or P-T) key operation

The Pulse to Tone (*/T or P-T) key is designed to support toll dialing (long distance call) or PABX system
operation. The "*/T (or P-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, (or P-T) k1, k2, .. , kn. These numbers will be dialed
out as following sequence:

d1, d2, .. , dn, Tpt, k1, k2, .. , kn.

(pulse mode) (tone mode)

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.

Truth table

Operating state Input/Output pin level

HKS PO XMUTE PM HFO
(0) On-hook, idle state H F F L L
(1) Off-hook line L F F L L
(2) Off-hook, HF line L F F L H

(3) On-hook, HF line H F F L H
Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level.

* This specification are subject to be changed without notice.

10.1.1997

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