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Fabricante

W91331N

TONE/PULSE DIALER WITH HANDFREE LOCK AND KEY TONE FUNCTIONS

Winbond 

W91330N SERIES

Pin Description, continued

SYMBOL 18-PIN

DTMF

12

20-PIN

14

I/O

FUNCTION

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

times. In tone mode, it will output a dual or single

tone. 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

R4

941

C1

1209

C2

1336

C3

1477

848

948

1216

1332

1472

-0.47

+0.74

+0.57

-0.30

-0.34

HFI, HFO

-

10, 11

I, O Handfree control pins. The handfree control state is

toggled on by a low pulse on the HFI input pin. The

status of the handfree control state is described in

the following table:

CURRENT STATE

NEXT STATE

Hook SW. HFO Input

HFO Dialing

Low HFI

High Yes

On Hook

High HFI

Low

No

Off Hook

On Hook

Off Hook

Off Hook

High HFI

Low

Yes

Off Hook Low

Yes

Low On Hook Low

No

High On Hook High Yes

HFI pin is pulled to VDD by internal resistor.

Detailed timing diagrams are shown in Figure 3.

KT

5

5

O Key-tone signal output. The key tone is generated

(except

(except

W91330LN) W91330ALN)

for all valid keys. Frequency is 600 Hz and duration

is 35 mS.

-4-

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