W91473B Ver la hoja de datos (PDF) - Winbond

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W91473B

14-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE AND LOCK FUNCTIONS

Winbond 

W91473 SERIES

Pin Description, continued

SYMBOL 22-PIN

HFI, HFO

-

KT

-

DRS

-

24-PIN

12, 13

-

-

28-PIN

14, 15

9

21

I/O

FUNCTION

I, O Handfree control pins. A low pulse on the

HFI input pin toggles the handfree control

state. Status of the handfree control state

is listed in the following table:

CURRENT STATE

NEXT STATE

Hook Sw. HFO

-

Low

On Hook High

Off Hook High

On Hook -

Input

HFI ¡õ

HFI ¡õ

HFI ¡õ

Off Hook

HFO

High

Low

Low

Low

Dialing

Yes

No

Yes

Yes

Off Hook Low On Hook Low No

Off Hook High On Hook High Yes

The HFI pin is pulled to VDD by an

internal resistor.

O Keytone signal output. The keytone will

be generated in all valid keys are pressed

in tone mode. Frequency is 600 Hz and

duration is 35 mS.

I Dial rate selection. This pin is pulled to

VDD by an internal resistor.

DRS

MODE

PIN

TONE/PULSE

DIAL

RATE

M/B

VDD

Pulse 10 ppS 2:3

1 Floating

Pulse 10 ppS 1:2

VSS

Tone

-

-

VDD

Pulse 10 ppS 1:2

0 Floating

Pulse 20 ppS 1:2

VSS

Tone

-

-

Publication Release Date: February 1995

-5-

Revision A3

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