W91210 Ver la hoja de datos (PDF) - Winbond

Número de pieza

componentes Descripción

Fabricante

W91210

TONE/PULSE DIALER WITH REDIAL FUNCTION

Winbond 

PIN CONFIGURATION

W91210 SERIES

C1

1

C2

2

C3

3

MODE

4

VSS

5

XT

6

XT

7

T/P MUTE

8

16

R4

15

R3

14

R2

13

R1

12

VDD

11

DTMF

10

DP/C4

9

HKS

W91212/W91214/W91214A/W91216

PIN DESCRIPTION

SYMBOL 16-PIN

Column-

Row Inputs

1−3

&

13−16

XT, XT

6, 7

T/P MUTE

8

MODE

4

I/O

FUNCTION

I The keyboard input may be from either the standard 4 × 4 keyboard

or an inexpensive single contact (form A) keyboard. Electronic

input from a µC can also be used. A valid key entry is defined by a

single row being connected to a single column.

I, O A built-in inverter provides oscillation with an inexpensive 3.579545

MHz crystal or ceramic resonator.

O The T/P MUTE is a conventional CMOS N-channel open drain

output. The output transistor is switched on during pulse and tone

mode dialing sequences and flash break. Otherwise, it is switched

off.

I Pulling mode pin to VSS places the dialer in tone mode.

Pulling mode pin to VDD places the dialer in pulse mode

(10 ppS, M/B = 2:3).

If the mode pin is left floating, the dialer is in pulse mode

(10 ppS, M/B = 1:2).

-2-

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