W9145 datasheet(4/18 Pages) WINBOND | 15-MEMORY TONE/PULSE DIALER WITH LOCK AND HANDFREE FUNCTION

4 page

W9145 SERIES

- 4 -

Pin Description, continued

SYMBOL

22-PIN

24-PIN

I/O

FUNCTION

HFI

HFO

12, 13

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:

HOOK SW.

On Hook

Off Hook

On Hook

Off Hook

CURRENT STATE

NEXT STATE

HFO

Low

High

Low

High

INPUT

HFI

Off Hook

On Hook

HFO

High

Low

High

DIALING

Yes

HFI

pin is pulled to VDD by internal resistor.

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.

LOCK

(W9145L

only

)

(W9145AL

only)

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

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

Normal dialing mode

"0," "9" dialing inhibited

"0" dialing inhibited

Floating

TEST

(W9145

only)

(W9145A

only)

During normal operation, the TEST pin should be tied to

VDD, thereby inhibiting the single tone and setting the

pulse rate to 10 ppS.

/ C5

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.

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