W91590CL datasheet(4/20 Pages) WINBOND

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W91590 SERIES

- 4 -

Pin Description, continued

SYMBOL

22-PIN

24-PIN

28-PIN

I/O

FUNCTION

LOCK

(For

W91590L)

(For

W91590AL)

(For

W91590BL/CL)

The function of this pin is as follows:

LOCK PIN

FUNCTION

VDD

Floating

VSS

"0","9" dialing inhibited

Normal dialing

"0" dialing inhibited

DTMF

O In pulse mode, remains in low state at all

times. In tone mode, outputs a dual or single

tone. Detailed timing diagram for tone mode

is shown in Figure 2.

OUTPUT FREQUENCY

Specified

Actual

Error%

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

16, 8

18, 8

20, 10

Power input pins.

HFI, HFO

12, 13

14, 15

I, O Handfree control pins. A low pulse on the

HFI input pin toggles the handfree control

state. Status of the handfree control state is

listed in the following table:

CURRENT STATE

Hook SW.

On Hook

Off Hook

On Hook

Off Hook

HFO

Low

High

Low

High

Input

Off Hook

On Hook

HFO

High

Low

High

Dialing

Yes

NEXT STATE

HFI

Low

HFI pin is pulled to VDD by internal resistor.

The detailed timing is shown in Fig 3.

O Key tone signal output. A key tone will be

generated whenever a valid keys is pressed.

Frequency is 600 Hz and duration is 35 mS.

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