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EM91850

TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION

ELAN Microelectronics 

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

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