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W91F811AN Datasheet(PDF) 5 Page - Winbond

Part # W91F811AN
Description  23-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W91F811AN Datasheet(HTML) 5 Page - Winbond

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W91F810N SERIES
Publication Release Date: March 2000
- 5 -
Revision A2
Pin Description, continued
SYMBOL
22-PIN
24-PIN
28-PIN
I/O
FUNCTION
VDD, VSS
16, 8
18, 8
21, 9
I
Power input pins for the dialer chip. VDD is the power
and VSS is the ground.
V1, V2
-
-
14, 15
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:
HOOK SW.
-
On Hook
Off Hook
On Hook
Off Hook
Off Hook
CURRENT STATE
NEXT STATE
HFO
Low
High
High
-
Low
High
INPUT
HFI
HFI
HFI
Off Hook
On Hook
On Hook
HFO
High
Low
Low
Low
Low
High
DIALING
Yes
No
Yes
Yes
No
Yes
The HFI pin is pulled to VDD by an internal resistor.
A detailed timing diagram is shown in Figure 3.


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