W9145A Просмотр технического описания (PDF) - Winbond

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производитель

W9145A

15-MEMORY TONE/PULSE DIALER WITH LOCK AND HANDFREE FUNCTIONS

Winbond 

W9145 SERIES

Pin Description, continued

SYMBOL 22-PIN

HFI ,

-

HFO

24-PIN

12, 13

I/O

FUNCTION

I, O Handfree control pins.

A low pulse on HFI toggles on the handfree control state.

Status of the handfree control state is indicated in the

following table:

CURRENT STATE

HOOK SW. HFO

-

Low

On Hook

High

Off Hook

High

On Hook

-

Off Hook

Low

Off Hook

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

KT

LOCK

HFI pin is pulled to VDD by internal resistor.

12

14

O Key tone signal output. A 1.2 KHz key tone will be

generated when any key is depressed in pulse mode or

when function keys are depressed in tone mode.

15

17

I The function of this terminal is to prevent "0" dialing in

(W9145L (W9145AL

only)

only)

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

FUNCTION

VDD

Floating

Normal dialing mode

"0," "9" dialing inhibited

VSS

"0" dialing inhibited

TEST

DP / C5

15

(W9145

only)

10

17

(W9145A

only)

10

I During normal operation, the TEST pin should be tied to

VDD, thereby inhibiting the single tone and setting the

pulse rate to 10 ppS.

O This pin is a CMOS inverter output.

The timing diagram is shown in Figure 1. Flash key will

cause DP / C5 to go active in either pulse or tone mode.

-4-

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