W91472N datasheet(3/14 Pages) WINBOND

Part #	W91472N

Description	6-MEMORY TONE/PULSE DIALER WITH SAVE AND HANDFREE FUNCTION

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Manufacturer	WINBOND [Winbond]

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W91472N SERIES

Publication Release Date: May 1997

- 3 -

Revision A2

Pin Description, continued

SYMBOL

18-PIN

20-PIN

I/O

FUNCTION

MODE

13

15

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).

HKS

10

12

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.

DP / C6

11

13

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).

DTMF

12

14

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).

R1

R2

R3

R4

C1

C2

C3

Specified

697

770

852

941

1209

1336

1477

699

766

848

948

1216

1332

1472

Actual

+0.28

-0.52

-0.47

+0.74

+0.57

-0.30

-0.34

Error %

OUTPUT FREQUENCY

VDD, VSS

14, 6

16, 6

I

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

power and VSS is the ground.

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