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W91F810N

23-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

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W91F810N SERIES

Pin Description, continued

SYMBOL 22-PIN 24-PIN 28-PIN I/O

FUNCTION

VDD, VSS 16, 8

V1, V2

-

18, 8

-

21, 9

14, 15

I Power input pins for the dialer chip. VDD is the power

and VSS is the ground.

O Volume control output pins. These two pins can be

toggled by the volume control keys (Vup, Vdown).

These two pins output is a conventional CMOS N-

channel open drain output.

HFI , HFO

-

12, 13 13, 16 I, O Handfree control pins.

A low pulse on the HFI input pin toggles the

handfree control state. The status of the handfree

control state is listed 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 High HFI

Low Yes

On Hook

- Off Hook Low Yes

Off Hook Low On Hook Low

No

Off Hook High On Hook High Yes

The HFI pin is pulled to VDD by an internal resistor.

A detailed timing diagram is shown in Figure 3.

Publication Release Date: March 2000

-5-

Revision A2

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