W91F810AN WINBOND [Winbond], W91F810AN Datasheet - Page 5

• Manufacturer Part Number: W91F810AN
• Description: 23-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS
• Manufacturer: WINBOND [Winbond]

Pin Description, continued
HFI , HFO
SYMBOL
V
V1, V2
DD
, V
SS
22-PIN
16, 8
-
-
24-PIN
12, 13
18, 8
-
28-PIN
14, 15
13, 16
21, 9
I, O Handfree control pins.
I/O
O
I
Power input pins for the dialer chip. V
and V
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.
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:
The HFI pin is pulled to V
A detailed timing diagram is shown in Figure 3.
- 5 -
CURRENT STATE
HOOK SW.
On Hook
Off Hook
On Hook
Off Hook
Off Hook
-
SS
is the ground.
HFO
Low
High
High
Low
High
-
Publication Release Date: March 2000
INPUT
HFI
HFI
HFI
Off Hook
On Hook
On Hook
W91F810N SERIES
FUNCTION
NEXT STATE
DD
HFO
High
Low
Low
Low
Low
High
by an internal resistor.
DIALING
Yes
Yes
Yes
Yes
No
No
DD
is the power
Revision A2