W91F810N Datasheet, PDF (5/26 Pages) Winbond – 23-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

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. V^DD 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 V^DD by an internal resistor.
A detailed timing diagram is shown in Figure 3.
Publication Release Date: March 2000
-5-
Revision A2