W91550DNF-1 datasheet(4/32 Pages) WINBOND

Part #	W91550DNF-1

Description	13-MEMORY TONE/PULSE DIALER WITH LCD AND LOCK FUNCTION

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Manufacturer	WINBOND [Winbond]

Direct Link	http://www.winbond.com

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W91550DN SERIES

- 4 -

Pin Description, continued

SYMBOL

I/O

FUNCTION

DTMF

35

O

In pulse mode, this pin remains in low state at all times.

In tone mode, it will output a dual or single tone. A detailed timing

diagram for tone mode is shown in Figure 2(a), 2(b), 2(c) 2(d).

Specified

Actual

Error %

Output Frequency

R1

R2

R3

R4

C1

C2

C3

697

770

852

941

1209

1336

1477

699

766

848

948

1216

1332

1472

+0.28

-0.52

-0.47

+0.74

+0.57

-0.30

-0.34

VDD, VSS

38, 34

I

Power input pins.

B/M

36

I

Make: Break ratio select pin.

If B/M = VDD, the M/B ratio is 40:60.

If B/M = VSS, the M/B ratio is 33.3:66.7.

B/M pin is pulled to VDD by internal resistor.

S/ M

26

I

Save and mercury select pin.

If S/ M = VDD, the save function is selected.

If S/ M = VSS, the mercury function is selected.

S/ M pin is pulled to VDD by internal resistor.

ATS

41

I

If ATS = VDD, the auto timer function is enabled.

If ATS = VSS, the auto timer function is disabled.

ATS pin is pulled to VDD by internal resistor.

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W91550DNF-1 Datasheet(PDF) 4 Page - Winbond

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