The EM91865 are 13 memory tone/pulse switchable dialer with Last Number Redail (LNB) anD SAVE function,
Which are fabricate in CMOS technology with wide operating voltage for both tone and pulse mode. EM91865
consumes very low memory retention current in on hook state. The EM91865 provide necessary functions of
telephone set for application in any environment, such as pulse dialing, tone (DTMF)dialing, handfree dialing. Beside
this, hold, mute and redial function are provide for particular operation. In redial mode EM91865 can auto insert
pause
time for application in PABX system. EM91865 also have a special I/O pin - VAO can used tocontrol
the receive volume amplify circuit.
FEATURES
• Volume add Control Function.
• One key Redial Function.
• Flash key is available and have multiple Flash time ( 600 ms, 300 ms, 100 ms ) can be selected.
• Auto Insert Pause Time.
• Tone/Pulse Switchable.
• Pulse mode fixed 10PPS.
• Pulse to tone ( P→T ) key is provided for PABX operation.
• Many options can be selected by R option.
Mode ( Pulse, Tone )
M/B ratio ( 40:60 ; 33:66 )
Auto insert pause time ( enable ; disable )
• 13 sets 16 digits one touch memory, or 3 set one touch and ten set two touch 16 digits
• One set 32 digits SAVE function.
• One set 32 digits LNB redial function.
• Mixed and cascaded dialing.
• Hold and Mute function.
• Hand Free dialing.
• Tone duration and inter -tone pause are fixed at 90 ms.
• Flash pause time are fixed at 600 ms.
• Pulse to Tone pause time are fixed at 3.6sec.
• Uses 3.579545 MHz crystal or ceramic resonator (with built-in capacitor, no need extra capacitor).
• Package in DIP 18 or DIP 16.
memory.
Total System
• Operating voltage : 2.0V ~ 5.5V
• Operating current : Tone mode 0.3 mA (typical) ~ 0.5 mA
Pulse mode 0.15 mA (typical) ~ 0.2 mA
• Standby current : 0.01 uA ( typical ) 0.1 uA ( max. )
• Use single clock 3.579545 MHz crystal
* This specification are subject to be changed without notice.
4.28.1999
1
PIN ASSIGNMENTS
EM91865
13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Preliminary
EM91865B
K7
1
2
K5
3
4
XIN
5
XOUT
VSS
VAO
HFI
6
7
8
9
18
17
16
15
14
13
12
11
10
K8
K3
K2
K1/HDO
DTMF
PO
HKS
VDD
HFO
K7
K6/XMUTE
K5
K4/MUTEO
XIN
XOUT
VSS
VAO
EM91865A
16
15
14
13
12
11
10
9
K8
K3
K2
K1/HDO
DTMF
PO
HKS
VDD
1
2
3
4
5
6
7
8
K6/XMUTE
K4/MUTEO
PIN DESCRIPTIONS
SymbolFunction
K2 , K3 , K5 ~ K8Key board scan I/O pins, key scans by ripple way.
I/O pinThese pins output 16K Hz signal one by one and periodically for key board scan.
K1/HDOThis pin has two functions
Normally this pin will be a Key board scan pins function same as K1~K8.
In Hold condition this pin will stay in "High" level to control the Hold circuit and scan HD
input key. In Hold condition all key will not allow keying except HD, HF and Hook switch.
K4/MuteOThis pin has two functions
Normally this pin will be a Key board scan pins function same as K1~K8.
In MUTE condition this pin will stay in "High" level and output signal with the inverse of key
scan to control the MUTE circuit and scan input key. Any key input will release MUTE
condition.
K6/XMUTEThis pin has two functions
Normally this pin will be a Key board scan pins function same as K1~K8.
The Tone/Pulse dialing Mute signal output pin. This pin will switch to "High" level during
Tone/Pulse dialing and hold function. Otherwise, this pin DC level stays "Low".
VDD, VSSPositive and negative power supply input pin
Xin, XoutOscillator input and output pins, built in two 5pf capacitor so it's not need external capacitor.
A 3.579545 MHz crystal must be crossed between Xin and Xout.
HFIHandfree function Input pin accepts rising edge signal to turn "on" or turn "off" handfree
function. This pin is hysteresis input structure and built-in pull down resistor (typically 200
KΩ) .
HFOHandfree 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.
HKSHook Switch detects input pin, which is hysteresis input structure and without internal pull
up resistor.
DTMFDTMF (Dual Tone Multi-Frequency) output pin, In tone dialing mode, this pin will output
DTMF signal that is corresponding to key board 0~9, *, # key.
POPulse signal output pin that is NMOS open-drain. This pin is for pulse dialing. This output is
"Low" during pulse dialing blank duration and Flash operation active, otherwise will be "High
impedance".
VAOVolume Add output pin , which is open drain structure.
Normally this pin will stay in "High Impedance". When Volume add active and dialer in OFF-
HOOK mode operting then this pin will output "Low".
* This specification are subject to be changed without notice.
4.28.1999
2
Key Assignment :
K1
HD
K2
RD
K3
123
K4
45 6
K5
78 9
K6
*/T
K7
SAVE
0
EM2
EM91865
13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Preliminary
MUTE
P
#
EM3EM1
F1
ST
VA
F2
RC
F3
M0
M9
K8
M1
HDOMuteO
M2M3M4M7
RRR
R_option
KEYBOARD DESCRIPTION :
KeyDescription
0~9, *, #Digit key
F1, F2, F3Flash key, flash time F1=600ms F2=300ms F3=100ms
*/TIn Pulse mode, this key mean Pulse to Tone function key
RDRedial and One key Redial key
PPause key.
HDHold function key, at hold mode to key in "HD" key will go to idle On-hook
state
HFHandfree function key
SAVESAVE function key
STStore memory function key
EM1~EM3, M1~M10One touch memory function key
RCRecall key for two touch memory Recall
VAVolume Add key.
MUTEMUTE key. When this key be pressed MuteO output will be "high", and
any key-in will release mute.
M6M5
XMUTE
R_option
M8
* This specification are subject to be changed without notice.
4.28.1999
3
13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Preliminary
FUNCTION DESCRIPTIONS
Dialer Option selection
The EM91865 incorporated a special keyboard scanning function that is connecting a resistor ( typically is
560 KΩ ) on keyboard scan pin to select many telephone specifications.
The specifications are described as follow :
a. M/B ratio
K2M/B ratio
NR40:60
R-Vss33:66
b. Auto Insert Pause timed. Mode
K3Auto InsertK5Mode
Pause time
NRDisableNRTone
R-VssEnableR-VssPulse
EM91865
Normal Dialing :
Press the digital key directly on keyboard which number can be dialing out and stored in LNB memory auto
matically. Operating procedure described as following:
• To select Pulse or Tone mode.
• Off-Hook or turn on HF function.
• Keying d1,d2,....dn. The "d" expressed digital key pressed that include 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 Function :
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 :
EM91865 provide Redial and One Key Redial function
(1) Redial function
Off-Hook normal dialing directly keying "F" key (or ON-OFF Hook once) and key-in "RD" keyboard.
The numbers stored in LNB memory will be dialed out.
(2) One Key Redial function
Off-Hook normal dialing, if busy, press the "RD" key directly then the line will be broken about 1.2 sec
with Trp redial pause time and dial out the numbers stored in LNB memory automatically.
* This specification are subject to be changed without notice.
4.28.1999
4
EM91865
13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Auto Insert Pause Time Function
Preliminary
EM91865 Provides a new function - Auto Insert Pause Time function - for PABX system user. In PABX
system, we usually use a special number to identify the phone want dial out or just a internal phone. So between
the first and second number, the PABX system will switch to central office, that will be few second switch time.
The auto insert pause time function will auto insert the pause time between first and second digit in redialing mode.
This function are provide a pause time to wait PABX switch to Central Office. In fact, the pause time are record
the waiting time of last dialing between the first and second digit. The auto insert pause minimum duration are equal
0 second, maximun duration are equal 3.5 second, and pause duration scale are 0.1 second. So, if the time during
user keying first and second digit are longer than 3.5 seconds, the auto insert pause time will be limited at 3.5 second.
By this function, we can redial the correct number out in PABX system. This function can select enable or disable
by R_option.
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, P , k1, k2, ..... ,kn). These numbers will be dialed out
as following sequence :
d1, d2,.....dn, Tp, k1, k2, ..... ,kn (Tp are the pause Time)
SAVE redial memory
The SAVE memory is designed in EM91865 to support digits capacity buffer for second redial, pager, special
memory for memo and other system applications.
Storing : EM91865 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.
Noted : In the [ ] key allows to be omitted.
• SAVE buffer are the length 32 digits number.
Method 2 :
On or Off-hook (or turn on HF function), push ST, d1, d2 ....., dn, [ST], SAVE. If the keying 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 or after executing Flash function), first push SAVE key. The numbers stored
in SAVE memory will be dialed out in Pulse or Tone mode as selection.
* This specification are subject to be changed without notice.
4.28.1999
5
EM91865
13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
One Touch memory :
Preliminary
The EM91865 incorporated 13 sets one touch memory each one can store numbers up to 16 digits. In memory
storing, if stored numbers are more than 16 digits that only the previous 16 digits can be stored into specific
memory.
Storing of 13 sets memory :
On-Hook or Off-Hook state, push (ST, d1, d2,.....di, [ST], EMn or Mn). The numbers d1, d2,....di will be stored
into memory location "n", the "n" expressed digital key from 1~3 for EM and 0~9 for M.
Dialing (after memory dialed out, the numbers of memory will copy to LNB) :
• To select Pulse or Tone mode.
• Off-hook (or turn on HF function), push EMn or Mn key. The memory content will be dialed out.
Two Touch memory :
The EM91865 incorporated 10 sets two touch memory each one can store numbers up to 16 digits. In memory
storing, if stored numbers are more than 16 digits that only the previous 16 digits can be stored into specific
memory.
Storing of 10 sets two Touch memory :
On-Hook or Off-Hook state, push (ST, d1, d2,.....dn, ST, m). The numbers d1, d2,....dn will be stored into memory
location "Mm", the "m" expressed digital key from 0~9 map to M0~M9.
Dialing (after memory dialed out, the numbers of memory will copy to LNB) :
• To select Pulse or Tone mode.
• Off-hook(or turn on HF function), push(RC , m). The memory content in Mm will be dialed out.
Cascade dialing :
LetEM1=1,2,3
EM2=4,5,6
EM3=7,8,9
At off-hook state, key in EM1, EM2, EM3, the LNB=1,2,3,4,5,6,7,8,9, and the number will be dialed out.
The max. cascade dialing numbers are 32 digits.
Mixing dialing :
LetLNB=7,8,9
M2=4,5,6
EM1=1,2,3
At off-hook state, key in "RD", EM1, *, 0, P, ( A , 2 ) , then the LNB=7,8,9,1,2,3,*, 0, P,4,5,6, and the number
will be dialed out.
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 be 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 :
* This specification are subject to be changed without notice.
4.28.1999
6
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