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EM91865A

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

ELAN Microelectronics 

EM91865

13 MEMORY TONE/PULSE DIALER WITH HF, HD, REDIAL

AND VOLUME CONTROL FUNCTION

Preliminary

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 advance version EM91865B 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 function (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 EM91865 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.

Volume add function

EM91865 provide Volume Add function to control the speech network for adding the receiving volume. Except

idle On-Hook state, Volume add function will working effect no matter what state is. Volume add function are

toggle structure. Every time touch VA key will inverter the VAO pin condition ( H→L→H→L→.....). So Volume

add will active or release each time keying VA. If and only if, when dialer back to the idle On_Hook state then

the Volume add function will force to release. This solution protect the user will not be hurt by loud volume.

Although Volume add state will not change by Off_Hook or HF operation but if dialer are in HF mode then

Volume add outpout (VAO) will be inhibited.

Noted : Except dialer back to idle state, any other operate will not reset volume add situation ( include HD,

HF, Flash ..... , and so on ). So volume add situation will be hold until dialer back to idle.

* This specification are subject to be changed without notice.

4.28.1999 7

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