EM91215

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

* This specification are subject to be changed without notice.

10.1.1997

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.

ORDERING INFORMATION

Versions list

VERSION LNB KT SAVE HF SDO(LCD) PMUTE

EM91215A

√

EM91215B

√

EM91215C

√

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

* This specification are subject to be changed without notice.

10.1.1997

FUNCTIONAL BLOCK DIAGRAM

EM91215

Keyboard Arrangement

Type A

Type B

Pin Assignment

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

provided.

COL5

COL4/KT

COL3

COL2

COL1

XIN

XOUT

XMUTE

VSS

ROW4

ROW3

ROW2

ROW1

HKS

VDD

DTMF

EM91215AP

COL5

COL4/KT

COL3

COL2

COL1

XIN

XOUT

XMUTE

VSS

HFI

ROW4

ROW3

ROW2

ROW1

HKS

VDD

DTMF

HFO

EM91215BP

ROW6

COL5

COL4/KT

COL3

COL2

COL1

XIN

XOUT

XMUTE

VSS

HFI

ROW5/SDO

ROW4

ROW3

ROW2

ROW1

HKS

VDD

DTMF

HFO

EM91215CK

ROW1

ROW2

ROW3

ROW4

ROW5/SDO

ROW6

COL1

*/T

COL2

COL3

COL4/KT

SAVE

RD/P

COL5

EM1

EM2

EM3

M10

ROW1

ROW2

ROW3

ROW4

ROW5/SDO

ROW6

COL1

COL2

COL3

COL4/KT

→

RD/P

COL5

EM1

EM2

EM3

M10

COL1

COL2

COL3

COL4/KT

COL5

XIN

XOUT

ROW1

ROW6

HFO PM

XMUTE

Keyboard

interface

(column)

Oscillator

Keyboard

interface

(Row)

Output circuit

Memory

(Melody)

Timing/Control circuit

Input circuit

Pulse

generator

latch

decoder

D/A

converter

Row/Column

programming counter

DTMF

HKS

HFI

VDD

SDO

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

* This specification are subject to be changed without notice.

10.1.1997

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.

and V

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

2.0Vdc to 5.5Vdc.

HFI

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

handfree function. This pin is hysteresis input structure and built-in pull up resistor

(typically 200 Kohms).

HFO

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

control speakerphone circuit for handfree conversation. When handfree function is

executed, this pin will switch to“High”. Otherwise, this pin stays “Low” level.

DTMF

The DTMF (Dual Tone Multi-Frequency) 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.

HKS

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

left from cradle, this pin must be connected to “Low” level to operate all functions.

Otherwise, this pin must be connected to “High” level to disable all function and

prevent power consumption.

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

stays “High impedance” level. In Pulse dialing mode and keypad was entry. This pin

will output pulse trains signal that is corresponding to keyboard 0 .. 9 keys.

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

stays “Low” level. During pulse signal dialing or flash function executing, this pin will

switch to “High” level to control the external circuit.

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.

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

* This specification are subject to be changed without notice.

10.1.1997

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

40:60

Tone

R-Vss

33:66

R-Vss

10 PPS

c. Flash time

d. DTMF signal

ROW3

ROW4

Tf (ms)

COL1

Td (ms)

Titp (ms)

600

R-Vdd

R-Vss

100

R-Vss

300

e. Pause time and P-T wait time

f. Keyboard operate type

COL2

Tp (sec)

Tpt (ms)

COL3

Type

3.6

R-Vss

2.0

R-Vss

g. ROW5/SDO pin functions

COL5

ROW5/SDO pin

SDO

R-Vss

ROW5

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 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.

(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)

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

* This specification are subject to be changed without notice.

10.1.1997

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

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.

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

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

* This specification are subject to be changed without notice.

10.1.1997

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 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 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

XMUTE

HFO

(0) On-hook, idle state

(1) Off-hook line

(2) Off-hook, HF line

(3) On-hook, HF line

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

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

* This specification are subject to be changed without notice.

10.1.1997

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.

bit 0

bit1

bit2

bit3

bit4

bit5

ready

start bits

data bits

stop bits

SDO Keypad Encoded table:

♦

Digital key (b5,b4=0,0)

keypad

“*”/T

*/”T” or P-T

output

b3,b2,b1,b0 0001 0010 0011 0100 0101 0110 0111 1000 1001

1010 1011

1100 1101

1110

Display





♦

Function key (b5,b4=1,0)

keypad

output

b3,b2,b1,b0

1111

Display

clear all display

∗

Keypad,SDO format and LCD display reference table:

Keypad

bit5

bit4

bit3

bit2

bit1

bit0

Display

“*”/T





*/”T” or P-T

clear all display

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

* This specification are subject to be changed without notice.

10.1.1997

ABSOLUTE MAXIMUM RATINGS

(Ambient temperature is 25

C, all voltages referenced to V

)

Items

Sym.

Rating

Unit

Power supply voltage

6.0 Vdc

Input voltage range

-0.3V ~ V

+0.3V

Operating temperature

OPR

0 ~ +50

Storage temperature

STO

-55 ~ 125

Power consumption

500

ELECTRICAL CHARACTERISTICS

(Ambient temperature is 25

C, V

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

, Fosc=3.579545 MHz)

Parameter

Sym.

Min.

Typ.

Max.

Unit

Condition

Operating voltage

Pulse

2.0

5.5

unload

Tone

2.0

5.5

Operating current(HKS=0)

Pulse

Idd

0.15

0.3

unload

Tone

0.3

0.5

Pulse

0.15

0.3

with pull up/down

Tone

0.3

0.5

resistor * 8

Memory retention current

Imrt

0.001

0.1

HKS=1,Vdd=1V

Standby current

HKS=1

Istby

0.001

0.1

unload

HKS=0

HKS=1

-0.001

0.1

with pull up/down

HKS=0

resistor * 8

HKS, HFI

ViH

0.8Vdd

Vdd

pins: input voltage

ViL

Vss

0.2Vdd

HFO & PM pins source current

IoH

0.2

Vo = 2.0 V

PO, HFO, XMUTE,

IoL

-0.2

Vo = 0.5 V

& PM, SDO pins: sink current

PO, XMUTE and SDO

IoH

0.001 uA

Vo = Vdd

pins: leakage current

HFI pin input resistance

Rhfi

200

Ω

Vhfi = Vss

Keyboard scanning pins

IoH

Vksn=Vss

output current (except COL4/KT)

IoL

200

400

800

Vksn=Vdd

COL4/KT source current

IoH

0.2

Vo=2.0V

sink current

IoL

0.2

Vo=0.5V

EM91215 SERIES

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

* This specification are subject to be changed without notice.

10.1.1997

Keyboard debounce time

Tdb

Key tone signal:

frequency

Fkt

600

present duration

Tkt

Pause time and pulse to tone

3.6

sec.

COL2=NR

Tpt

sec.

COL2=R-Vss

Flash time

600

Row3, Row4=NR, NR

100

Row3, Row4=NR, R-Vss

Row3, Row4=R-Vss, NR

300

Row3, Row4=R-Vss,R-Vss

Flash pause time

Tfp

300

Pulse rate

PSR

pps

Row1 = R-Vdd

Row1 = R-Vss

Make/Break ratio

MBR

40:60

Row2 = NR

33:66

Row2 = R-Vss

Inter-digit pause time

Tidp

800

PSR = 10 pps

500

PSR = 20 pps

DTMF pin: sink current

IoL

-0.2

Vdtmf = 0.5 V

DTMF signal DC level

Vdc

0.5

0.75

Vdd

Vdd = 2.0V ~ 5.5V

DTMF signal: ac level

Vdtmf

142

160

180 mVrms Row group

pre-emphase

Twist

Column - Row

distortion

THD

-30

-23

RL = 5 K

Ω

load resistance

Ω

THD

<−

23dB

100

Minimum tone duration

Memory dialing

100

Minimum inter-tone pause

Titp

Memory dialing

SDO every bit time

Tbit

3.8

3.9

4.1

Parameter

Sym.

Min.

Typ.

Max. Unit

Condition

ELECTRICAL CHARACTERISTIC

(Ambient temperature is 25

C, V

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

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