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EM91850
Datasheet
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ELAN EM91850 Datasheet

EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Preliminary
GENERAL DESCRIPTION
application in PABX system. EM91850 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 )
• 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 16.
time for
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
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
PIN ASSIGNMENTS
Preliminary
EM91850
K6/XMUTE
K4/MUTEO
XOUT
VAO
PIN DESCRIPTIONS
Symbol Function
K2 , K3 , K5 Key board scan I/O pins, key scans by ripple way. I/O pin These pins output 16K Hz signal one by one and periodically for key board scan.
K1/HDO Thi s p in h a s t w o f unctions.
Normally this pin will be a Key board scan pins function same as K1~K6. 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/MuteO This pin has two functions
Normally this pin will be a Key board scan pins function same as K1~K6. 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/XMUTE This pin has two functions
Normally this pin will be a Key board scan pins function same as K1~K6. 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, VSS Positive and negative power supply input pin Xin , Xout Oscillator 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. HFI Handfree 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). 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. HKS Hook Switch detects input pin , which is hysteresis input structure and without internal pull
up resistor. DTMF DTMF (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. PO Pulse 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". VAO Volume 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".
K5
XIN
VSS
HFI
1
16
K3
2
15
K2
3
14
K1/HDO
4
13
DTMF
5
12
PO
6
11
HKS
7
10
VDD
8
9
HFO
* 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
SAVE
TONE/PULSE DIALER WITH HF, HD, REDIAL
Preliminary
MUTE
P
EM91850
AND VOLUME CONTROL FUNCTION
VA
K6
*/T
HDO
KEYBOARD DESCRIPTION :
Key Description
0~9,*,# Digit key. F1 , F2 , F3 Flash key, flash time F1=600ms F2=300ms F3=100ms. */T In Pulse mode, this key mean Pulse to Tone function key. RD Redial and One key Redial key. P Pause key. HD Hold function key, at hold mode to key in "HD" key will go to idle On-hook
HF Handfree function key. SAVE SAVE function key. VA Volume Add key. MUTE MUTE key. When this key be pressed MuteO output will be "high", and
0
R_option
state.
any key-in will release mute.
#
RR R
F1
MuteO
F2
F3
XMUTE
R_option
* This specification are subject to be changed without notice.
4.28.1999
3
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
FUNCTION DESCRIPTIONS
Dialer Option selection
The EM91850 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
K2 M/B ratio NR 40:60 R-Vss 33:66
b. Auto Insert Pause time d. Mode
K3 Auto Insert K5 Mode
Pause time NR Disable NR Tone R-Vss Enable R-Vss Pulse
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.
Preliminary
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 :
EM91850 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
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Auto Insert Pause Time Function
EM91850 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 second, 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)
Preliminary
SAVE redial memory
The SAVE memory is designed in EM91850 to support digits capacity buffer for second redial, pager, special memory for memo and other system applications.
Storing : EM91850 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.
The 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
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Preliminary
Mixing dialing :
Let LNB=7,8,9 At off-hook state, key in "RD", *, 0, P, then the LNB=7, 8, 9, *, 0, P, 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 :
d1, d2,....dn, Tpt, k1, k2, ....., kn. (Tpt are the Pulse to Tone pause time)
(pulse mode) (tone mode)
Flash(F=F1,F2,F3) key operation
The Flash key is designed to break telephone line temporarily. After key is depressed, this dialer will send a flash signal to break line and reset all condition. The Flash's break time dependent on the which key be pressed, F1=600ms, F2=300ms, F3=100ms.
Handfree (HF) function
The Handfree function are provided in EM91850 to support on-hook dialing and loudspeaker application which can be turn "on" or "off" by pressed again "HF" key. 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 turnoff Handfree func tion (HFO pin return to "Low").
• On-Off hook once.
• Pressed "HF" key
• 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 back to idle On_Hook state
• Turn on Handfree (HF) function.(HFO pin switched to "High") ** In Hold state all key board will be disable except "HF" , "HD" key and HKS switch
Mute function
The EM91850 provide mute function to mute microphone or antler at off-hook (or turn on HF) state. When key­in "MUTE" key, "MuteO" pin will become "High" to mute microphone. Any key-in will release mute mode and operating the correct key.
* This specification are subject to be changed without notice.
4.28.1999
6
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