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PDF EM91850 Data sheet ( Hoja de datos )
| Número de pieza | EM91850 | |
| Descripción | TONE/PULSE DIALER WITH HF/ HD/ REDIAL AND VOLUME CONTROL FUNCTION | |
| Fabricantes | ELAN Microelectronics Corp | |
| Logotipo |  |
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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 ( 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.
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
1 page  
Auto Insert Pause Time Function
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Preliminary
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)
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
5 Page 
TIMING DIAGRAM
EM91850
TONE/PULSE DIALER WITH HF, HD, REDIAL
AND VOLUME CONTROL FUNCTION
Preliminary
HKS
KEY
XMUTE
DTMF
PO
XOUT
12
Tdb
Tpm Titp
Td
3
Figure 1. Tone Mode operating Timing
HKS
KEY
XMUTE
PO
DTMF
XOUT
12
Tdb
Tpm
tB
Tidp
3
Tdb
Tidp Tidp
Figure 2. Pulse Mode operating Timing
* This specification are subject to be changed without notice.
4.28.1999 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet EM91850.PDF ] | |
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