W91511AN 데이터 시트보기 (PDF) - Winbond

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W91511AN

TONE/PULSE DIALER WITH HANDFREE AND SAVE FUNCTIONS

Winbond 

W91510N SERIES

Pin Description, continued

SYMBOL 18-PIN

HFI, HFO

-

20-PIN

10, 11

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

High

On Hook

Off Hook

Off Hook

Low

High

NEXT STATE

Input

HFO

HFI

High

HFI

Low

HFI

Low

Off Hook Low

On Hook Low

On Hook High

Dialing

Yes

No

Yes

Yes

No

Yes

HFI pin is pulled to VDD by an internal resistor.

Detailed timing diagrams are shown in Figure 3.

BLOCK DIAGRAM

XT XT

SYSTEM CLOCK

GENERATOR

HKS

HFI

ROW

(R1 to R4, Vx)

COLUMN

(C1 to C4)

KEYBOARD

INTERFACE

DTMF

D/A

CONVERTER

READ/WRITE

COUNTER

CONTROL

LOGIC

LOCATION

LATCH

RAM

PULSE

CONTROL

LOGIC

ROW & COLUMN

PROGRAMMABLE

COUNTER

DATA LATCH

& DECODER

MODE

KT

T/P MUTE

DP

HFO

-4-

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