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參數(shù)資料
| 型號(hào)： | W91F843AN |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁(yè)數(shù)： | 5/26頁(yè) |
| 文件大?。?/td> | 221K |
| 代理商： | W91F843AN |
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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
V
DD
, V
SS
16, 8
FUNCTION
18, 8
21, 9
I
Power input pins for the dialer chip. V
DD
is the power
and V
SS
is the ground.
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.
V1, V2
-
-
14, 15
O
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 V
DD
by an internal resistor.
A detailed timing diagram is shown in Figure 3.
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