W91330LN datasheet(3/17 Pages) WINBOND

Part #	W91330LN

Description	TONE/PULSE DIALER WITH HANDFREE LOCK AND KEY TONE FUNCTION

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Manufacturer	WINBOND [Winbond]

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W91330N SERIES

Publication Release Date: May 1997

- 3 -

Revision A2

PIN DESCRIPTION

SYMBOL

18-PIN

20-PIN

I/O

FUNCTION

Column-

Row

Inputs

1

−4

&

15

−18

1

−4

&

17

−20

I

The keyboard inputs may be used with either the

standard 5

× 4 keyboard or the inexpensive single

contact (Form A) keyboard. Electronic input from a

µC can also be used.

A valid key-in is defined as a single row being

connected to a single column.

XT, XT

7, 8

I, O

A built-in inverter provides oscillation with an

inexpensive 3.579545 MHz crystal or ceramic

resonator.

T/P

MUTE

9

O

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

open drain output.

The output transistor is switched on during dialing

sequence, one-key redial break, and flash break

time. Otherwise, it is switched off.

MODE

13

15

I

Pulling mode pin to VSS places the dialer in tone

mode.

Pulling mode pin to VDD places the dialer in pulse

mode. (10 ppS; 20 ppS for W91331N/W91331AN,

M/B = 40:60)

Floating mode pin places the dialer in pulse mode.

(10 ppS; 20 ppS for W91331N/W91331AN, M/B =

33.3:66.7).

HKS

10

12

I

Hook switch input.

HKS = VDD: On-hook state. Chip in sleeping mode,

no operation.

HKS = VSS: Off-hook state. Chip enabled for normal

operation.

HKS pin is pulled to VDD by internal resistor.

DP

11

13

O

N-channel open drain dialing pulse output.

Flash key will cause DP to be active in either tone

mode or pulse mode.

The timing diagram for pulse mode is shown in

Figure 1(a, b, c, d).

VDD, VSS

14, 6

16, 6

I

Power input pins.

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