W91822N データシートの表示（PDF） - Winbond

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W91822N

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

Winbond 

W91820N SERIES

Pin Description, continued

SYMBOL 20-PIN 22-PIN I/O

FUNCTION

HFI, HFO

-

11, 12 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

listed in the following table:

CURRENT STATE

NEXT STATE

HOOK SW. HFO INPUT HFO DIALING

-

On Hook

Low HFI

High HFI

High Yes

Low

No

Off Hook High HFI

Low Yes

On Hook

- Off Hook Low 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.

A detailed timing diagram is shown in Figure 3.

BLOCK DIAGRAM

HKS

HFI

XT XT

SYSTEM CLOCK

GENERATOR

ROW

(R1 ~ R4, Vx/R5)

COLUMN

(C1 ~ C4, Vss)

KEYBOARD

INTERFACE

DTMF

D/A

CONVERTER

READ/WRITE

COUNTER

CONTROL

LOGIC

LOCK

MODE

LOCATION

LATCH

RAM

PULSE

CONTROL

LOGIC

ROW & COLUMN

PROGRAMMABLE

COUNTER

DATA LATCH

& DECODER

T/P MUTE

KT

DP

HFO

H/P MUTE

Publication Release Date: May 1999

-5-

Revision A2

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