W9145 查看數據表（PDF） - Winbond

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W9145

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

Winbond 

W9145 SERIES

SYMBOL

Column-

Row

Inputs

22-PIN

1−4

&

18−22

XT, XT

6, 7

T/P

8

MUTE

MODE

14

HKS

9

B/M

16

VDD, VSS

X MUTE

17, 5

13

24-PIN

1−4

&

20−24

6, 7

8

16

9

16

19, 5

15

I/O

FUNCTION

I Keyboard inputs may be connected to either a standard

keyboard, an inexpensive signal contact (Form A)

keyboard, or electronic input from a µC. A valid key entry

is defined by a single row being connected to a single

column.

I, O A built-in inverter provides oscillation by means of an

inexpensive 3.579545 MHz crystal or ceramic resonator.

O The T/P MUTE is a conventional CMOS inverter that

pulls to VDD in the absence of keypad input and pulls to

VSS when an address keypad entry is sensed (excluding

the * and # keypads in pulse mode). When any keypad in

row 5 and column 5 is pushed, the mute out remains at

high level.

I Pull to VSS to enable tone mode. Pull to VDD to enable

pulse mode (10 ppS).

I Hook switch input. When pulled to high, chip is in on-hook

state (no operation). When pulled to low, chip is in off-

hook state (enabled for normal operation). This pin is

pulled to VDD by internal resistor.

Note: This pin operates in conjunction with the handfree

control pins; for further information see description of

handfree control pins below.

I B/M = 1: Break/Make ratio is 60:40.

B/M = 0: Break/Make ratio is 67:33.

This pin has no function in tone mode.

I Power input pins.

O The X MUTE is a conventional CMOS inverter that in tone

mode is active while a DTMF signal is being transmitted.

In pulse mode, this output remains low at all times.

Publication Release Date: August 1996

-3-

Revision A4

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