W91521N datasheet(2/16 Pages) WINBOND

Part #	W91521N

Description	TONE/PULSE DIALER WITH HANDFREE AND HOLD FUNCTION

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Manufacturer	WINBOND [Winbond]

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W91520N SERIES

- 2 -

PIN CONFIGURATIONS

C4

1

2

3

4

5

6

7

8

9

10

HKS

DTMF

MODE

R4

R3

R2

R1

VDD

13

18

20

19

17

16

15

14

12

11

HFO

W91520AN/W91521AN

C1

C2

C3

SS

V

XT

T/P MUTE

HFI

H/P MUTE

DP/C5

W91520N/W91521N

1

2

3

4

5

6

7

8

9

HKS

DTMF

MODE

R4

R3

R2

R1

VDD

12

18

17

16

15

14

10

11

13

C1

C2

C3

C4

SS

V

XT

T/P MUTE

H/P MUTE

DP/C5

PIN DESCRIPTION

SYMBOL

18-PIN

20-PIN

I/O

FUNCTION

Column-

Row

Inputs

1

−4

&

15

−18

1

−4

&

17

−20

I

The keyboard inputs may be used with either a

standard 5

× 5 keyboard or an inexpensive single

contact (Form A) keyboard. Electronic input from a

µC

can also be used. A valid key-in is defined as a single

row being connected to a single column.

XT, XT

7, 8

I, O

A built-in inverter provides oscillation with an

inexpensive 3.579545 MHz crystal or ceramic

resonator.

T/P MUTE

9

O

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

open drain output.

The output transistor is switched on during dialing

sequence, one-key redial break, and flash break time.

Otherwise, it is switched off.

MODE

13

15

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; 20 ppS for W91521N/521AN, M/B =

40:60).

Floating mode pin places the dialer in pulse mode

(10 ppS; 20 ppS for W91521N/521AN, M/B =

33.3:66.7).

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