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EM91850 Schematic ( PDF Datasheet ) - ELAN Microelectronics Corp

Teilenummer EM91850
Beschreibung TONE/PULSE DIALER WITH HF/ HD/ REDIAL AND VOLUME CONTROL FUNCTION
Hersteller ELAN Microelectronics Corp
Logo ELAN Microelectronics Corp Logo 




Gesamt 20 Seiten
EM91850 Datasheet, Funktion
GENERAL DESCRIPTION
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Preliminary
The EM91850 are 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. EM91850 consumes very
low memory retention current in on hook state. The EM91850 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 EM91850 can auto insert pause time for
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 ( PT ) 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.
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 Datasheet, Funktion
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 turn off 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 key-
in "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

6 Page









EM91850 pdf, datenblatt
KEY
XMUTE
DTMF
PO
XOUT
KEY
XMUTE
PO
XOUT
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Preliminary
Pulse
Tone
1 2 */T 3
4
Tpt
Figure 3. Pulse to Tone operating Timing
F1
dial inhibited
2
3
Tf Tfp
Figure 4. Flash operating Timing
KEY
XMUTE
DTMF
PO
XOUT
Tone mode
1P
2
Tp
Pulse mode
1P2
Tp
Figure 5. Pause operating Timing
* This specification are subject to be changed without notice.
4.28.1999 12

12 Page





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