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EM91865A

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

ELAN Microelectronics 

PIN ASSIGNMENTS

EM91865

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

AND VOLUME CONTROL FUNCTION

Preliminary

EM91865A

EM91865B

K7 1

K6/XMUTE 2

K5 3

K4/MUTEO 4

XIN 5

XOUT 6

VSS 7

VAO 8

16 K8

15 K3

14 K2

13 K1/HDO

12 DTMF

11 PO

10 HKS

9 VDD

K7 1

K6/XMUTE 2

K5 3

K4/MUTEO 4

XIN 5

XOUT 6

VSS 7

VAO 8

HFI 9

18 K8

17 K3

16 K2

15 K1/HDO

14 DTMF

13 PO

12 HKS

11 VDD

10 HFO

PIN DESCRIPTIONS

Symbol

Function

K2 , K3 , K5 ~ K8

I/O pin

K1/HDO

K4/MuteO

K6/XMUTE

VDD, VSS

Xin, Xout

HFI

HFO

HKS

DTMF

PO

VAO

Key board scan I/O pins, key scans by ripple way.

These pins output 16K Hz signal one by one and periodically for key board scan.

This pin has two functions

Normally this pin will be a Key board scan pins function same as K1~K8.

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.

This pin has two functions

Normally this pin will be a Key board scan pins function same as K1~K8.

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.

This pin has two functions

Normally this pin will be a Key board scan pins function same as K1~K8.

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".

Positive and negative power supply input pin

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.

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) .

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.

Hook Switch detects input pin, which is hysteresis input structure and without internal pull

up resistor.

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.

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".

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".

* This specification are subject to be changed without notice.

4.28.1999 2

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