W91320 查看數據表（PDF） - Winbond

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W91320

TONE/PULSE DIALER WITH REDIAL FUNCTION

Winbond 

W91320N SERIES

Pin Description, continued

SYMBOL 18-PIN

HFI ,

-

HFO

20-PIN

10, 11

(W91320AN/

321AN)

LOCK

-

5

(6,

W91320LN

only)

22-PIN

11, 12

5

I/O

FUNCTION

I, O Handfree control pins. The handfree

control state is toggled on by a low

pulse on the HFI input pin. The status

of the handfree control state is

described in the following table:

CURRENT STATE

Hook SW. HFO

Low

On Hook

High

Off Hook

On Hook

High

Off Hook

Off Hook

Low

High

NEXT STATE

Input

HFO Dialing

HFI

High 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.

Detailed timing diagrams are shown in

Figure 3(a, b, c).

I The function of this terminal is to

prevent "0" dialing and "9" dialing under

PABX system long distance call control.

When the first key input after reset is 0

or 9, all key inputs, including the 0 or 9

key, become invalid and the chip

generates no output. The telephone is

reinitialized by a reset.

LOCK PIN

Floating

VDD

VSS

FUNCTION

Normal dialing mode

"0," "9" dialing inhibited

"0" dialing inhibited

Publication Release Date: May 1997

-5-

Revision A2

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