W91472 查看數據表（PDF） - Winbond

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W91472

6-MEMORY TONE/PULSE DIALER WITH SAVE AND HANDFREE FUNCTIONS

Winbond 

W91472N SERIES

Pin Description, continued

SYMBOL 18-PIN

MODE

13

HKS

10

DP / C6

11

DTMF

12

20-PIN

15

12

13

14

I/O

FUNCTION

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

Pulling mode pin to VDD places dialer in pulse mode

with M/B ratio of 40:60 (10 ppS, except for

91472BN/472CN = 20 ppS).

Leaving mode pin floating places dialer in pulse mode

with M/B ratio of 33.3:66.7 (10 ppS, except for

W91472BN/472CN = 20 ppS).

I The HKS input is used to sense whether the handset is

on-hook or off-hook.

In on-hook state, HKS = 1: chip is in sleeping mode, no

operation.

In off-hook state, HKS = 0: chip is enabled for normal

operation.

HKS pin is pulled to VDD by internal resistor.

O N-channel open drain dialing pulse output.

Flash key will cause DP to be active in either tone mode

or pulse mode.

The timing diagram for pulse mode is shown in Figure 1

(a, b, c, d).

O During pulse dialing, this pin remains in low state

regardless of keypad input. In the tone mode, it will

output a dual or single tone.

A detailed timing diagram for tone mode is shown in

Figure 2 (a, b, c, d).

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

14, 6

16, 6

I Power input pins for the dialer chip. VDD is the main

power and VSS is the ground.

Publication Release Date: May 1997

-3-

Revision A2

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