W91531 データシートの表示（PDF） - Winbond

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W91531

13-MEMORY TONE/PULSE DIALER WITH SAVE, KEYTONE, LOCK, AND HANDFREE FUNCTIONS

Winbond 

W91530N SERIES

PIN DESCRIPTION

SYMBOL 18-PIN 20-PIN I/O

FUNCTION

Column-

1−4

1−4

I The keyboard input is compatible with a standard 5 x 5

Row Inputs &

&

keyboard, an inexpensive single contact (Form A)

15−18 17−20

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 single

tone.

XT

7

7

I A built-in inverter provides oscillation with an inexpensive

3.579545 MHz crystal. The oscillator ceases when a

keypad input is not sensed. The crystal frequency deviation

is 0.02%.

XT

8

8

O Crystal oscillator output pin.

T/P MUTE

9

9

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

drain output.

The output transistor is switched on low level during dialing

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

switched off.

MODE

13

15

I Pulling mode pin to VSS places dialer in tone mode.

Pulling mode pin to VDD places dialer in pulse mode (10

ppS) with M/B ratio of 40:60 (W91532/532AN is 20 ppS).

Leaving mode pin floating places dialer in pulse mode (10

ppS) with M/B ratio of 33.3:66.7 (W91532/532AN is 20

ppS).

HKS

10

12

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

5

5

O The key tone output is a conventional CMOS inverter. The

(except (except

W91531LN) W91531ALN)

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.

Publication Release Date: May 1997

-3-

Revision A3

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