W91820N datasheet(3/22 Pages) WINBOND

Part #	W91820N

Description	13-MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

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Manufacturer	WINBOND [Winbond]

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W91820N SERIES

Publication Release Date: May 1999

- 3 -

Revision A2

PIN DESCRIPTION

SYMBOL

20-PIN

22-PIN

I/O

FUNCTION

Column-

Row

Inputs

1

−4

&

17

−20

1

−4

&

19

−22

I

The keyboard input is compatible with a standard 5

× 5

keyboard, an inexpensive single contact (Form A) keyboard,

and electronic input.

In normal operation, any single button can be pushed to

produce dual tone, pulses, or functions. Activation of two or

more buttons will result in no response except for a single

tone.

XT

8

I

A built-in inverter together with an inexpensive 3.579545 MHz

crystal supplies the oscillator. The oscillator stops when there

is no keypad input. The crystal frequency deviation is 0.02%.

XT

9

O

Crystal oscillator output pin.

T/P

MUTE

10

O

The T/P MUTE is a conventional CMOS N-channel open

drain output.

The output transistor turns on with a low level during a dialing

sequence (both pulse and tone mode). Otherwise, it is off.

N.C.

16

18

-

No connect

MODE

14

16

I

Connecting the mode pin to VSS places the dialer in tone

mode.

Connecting the mode pin to VDD places the dialer in pulse

mode with an M/B ratio of 40:60.

Leaving the mode pin floating places the dialer in pulse mode

with an M/B ratio of 33.3:66.7.

HKS

11

13

I

The HKS (hook switch) input is used to sense whether the

handset is on-hook or off-hook.

In on-hook state, HKS = 1: chip is in sleeping mode, no

operation.

In off-hook state, HKS = 0: chip is enabled for normal

operation.

HKS pin is pulled to VDD by internal resistor.

KT

(W91820N/8

20AN/822N/

824N/822AN

/824AN only)

5

O

The key tone output is a conventional CMOS inverter. The

key tone is generated when any valid key is pressed; the KT

pin generates a 1.2 KHz square wave at 35 mS. When no key

is pressed, the KT pin remains in low state.

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