EM91403 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
1
* This specification are subject to be changed without notice.
10.1.1997
GENERAL DESCRIPTION
The EM91403 is a series of tone/pulse switchable dialers that is composed of T/P dialer and T/P dialer with
3 sets memories. The EM91403 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, melody generator, ring detector and
SDO (Serial Data Output) functions are provided in advance version. Melody generator will output dual-tone
music in line hold duration. 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 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, lock dialing functions.
SDO function supports LCD driver and voice synthesizer to indicate dialing numbers.
Line hold function is designed for stopping conversation temporality.
Melody generator provides music on hold function.
Lock function provides conventionality key lock and password lock operations.
Ring detector is designed to prevent illegal dialing from pocket dialer.
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(music) LOCK HF SDO(LCD) PDP
EM91403A
EM91403B
EM91403C
EM91403D
Note : PDP = Pocket Dialer Prevented
EM91403 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
EM91403 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
2
* This specification are subject to be changed without notice.
10.1.1997
EM91403
Pin Assignment
COL5
COL4/KT
COL3
COL2
COL1
XIN
XOUT
XMUTE
VSS
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
HDO
PO
ROW4
ROW3
ROW2
ROW1
HKS
VDD
DTMF
EM91403AP
COL5
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
EM91403BP
NC
COL5
COL4/KT
COL3
COL2
COL1
XIN
XOUT
XMUTE
VSS
HFI
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
SDO
HDO
PO
ROW4
ROW3
ROW2
ROW1
HKS
VDD
DTMF
HFO
EM91403CK
NC
COL5
COL4/KT
COL3
COL2
COL1
XIN
XOUT
XMUTE
VSS
HFI
DRING
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
SDO
HDO
PO
ROW4
ROW3
ROW2
ROW1
HKS
VDD
DTMF
HFO
RMUTE
EM91403DK
ROW1
ROW2
ROW3
ROW4
COL1
1
4
7
*/T
COL2
2
5
8
0
COL3
3
6
9
#
COL4/KT
HD
F
RD/P
COL5
EM1
EM2
EM3
ST
Keyboard Arrangement
EM91403 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
3
* This specification are subject to be changed without notice.
10.1.1997
FUNCTIONAL BLOCK DIAGRAM
COL1
COL2
COL3
COL4/KT
COL5
XIN
XOUT
ROW1
ROW2
ROW3
ROW4
HFO HDO
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
PO
HKS
HFI
VDD
DRING
VDD
RMUTE
SDO
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
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 and hold function .
Otherwise, this pin stays "High impedance" level.
V
DD
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. Beside this, in the line hold
duration, this pin will issue dual-tone music for telephone line.
EM91403 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
4
* This specification are subject to be changed without notice.
10.1.1997
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 which is internal pull up (built-in 100 Kohms resistor).
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.
EM91403 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
5
* This specification are subject to be changed without notice.
10.1.1997
FUNCTION DESCRIPTIONS
Dialing signal selection
The EM91403 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.
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