W91312N 查看數據表（PDF） - Winbond

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W91312N

TONE/PULSE DIALER WITH REDIAL FUNCTION

Winbond 

Preliminary W91312N

PIN DESCRIPTION

SYMBOL

Column-

Row Inputs

PIN

1−4

&

15−18

XT, XT

7, 8

T/P MUTE

9

MODE

13

HKS

10

DP

11

DTMF

12

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 as 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 sequence 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). Leaving

mode pin floating places the dialer in pulse mode (20 ppS).

I Hook switch input. HKS = 1: On-hook state. Chip in sleeping

mode, no operation. HKS = 0: Off-hook state. Chip enabled for

normal operation. The HKS pin is pulled to VDD by an internal

resistor.

O N-channel open drain dialing pulse output (Figure 1). Flash key will

cause DP to go active in both pulse mode and tone mode.

O In pulse mode, remains in low state at all times. In tone mode,

outputs a dual or single tone. Detailed timing diagram for tone

mode is shown in Figure 2(a, b).

OUTPUT FREQUENCY

Specified

Actual

Error %

R1

697

699

+0.28

R2

770

766

-0.52

R3

852

848

-0.47

R4

941

948

+0.74

C1

1209

1216

+0.57

C2

1336

1332

-0.30

C3

1477

1472

-0.34

VDD, VSS

B/M

14, 6

5

I Power input pins.

I The break make ratio is 60:40 if B/M = 1 and is 66.6:33.3 if B/M =

0. This pin has no function in DTMF mode.

-2-

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