W91580 查看數據表（PDF） - Winbond

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W91580

24-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE AND HOLD FUNCTIONS

Winbond 

W91580 SERIES

Pin Description, continued

SYMBOL 22-PIN 24-PIN 28-PIN I/O

FUNCTION

HFI, HFO

-

12, 13 14, 15 I, O Handfree control pins. A low pulse on the HFI

input pin toggles the handfree control state. The

status of the handfree control state is described by

the following table:

CURRENT STATE

Hook SW.

-

HFO

Low

On Hook High

Off Hook

On Hook

High

-

Off Hook Low

Off Hook High

NEXT STATE

Input

HFI

HFO

High

Dialing

Yes

HFI

Low

No

HFI

Low

Yes

Off Hook Low

Yes

On Hook Low

No

On Hook High

Yes

HFI pin is pulled to VDD by internal resistor.

KT

-

-

9

O Keytone signal output. A keytone will be generated

whenever a valid key is pressed. Frequency is 600

Hz and duration is 35 mS.

DRS

-

-

21

I Dial rate selection.

This pin is pulled to VDD by an internal resistor.

DRS

1

0

MODE

PIN

VDD

Floating

VSS

VDD

Floating

VSS

TONE/PULSE

Pulse

Pulse

Tone

Pulse

Pulse

Tone

DIAL

RATE

M/B

10 ppS 2:3

10 ppS 1:2

10 ppS 1:2

20 ppS 1:2

-4-

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