W91572DNF データシートの表示（PDF） - Winbond
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W91572DNF Datasheet PDF : 45 Pages
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W91570DN SERIES
Pin Description, continued
SYMBOL PIN NO.
HFI, HFO
37, 17
DP / C10
18
DTMF
12
MODE
19
I/O
FUNCTION
I, Handfree control pins. A low pulse on the HFI input pin toggles
O the handfree control state.
Status of the handfree control is listed in the following table:
CURRENT STATE
Hook SW.
HFO
Low
On Hook
High
Off Hook
On Hook
High
Off Hook
Off Hook
Low
High
NEXT STATE
Input
HFO
HFI
High
Dialing
Yes
HFI
Low
No
HFI
Low
Yes
Off Hook
Low
Yes
On Hook
Low
No
On Hook
High
Yes
The HFI pin is pulled to VDD by internal resistor.
Detailed timing diagrams are shown in Figure 4(a), 4(b).
O This pin is a CMOS N-channel open drain output. The flash key
will cause DP / C10 to go active in either pulse mode or tone
mode. In lock mode, the DP / C10 keeps low for 300 mS during
off-hook delay time (If first off-hook occured after power-on
reset, the DP / C10 will keep high for 100ms then go low 200
mS. It will be recovered when first key-in was accepted). The
timing diagram is shown as Figure 1(a), 1(b), 1(c), 1(d).
O In pulse mode, this pin remains in low state at all times.
In tone mode, it will output a dual or single tone. Detailed timing
diagram for tone mode is shown in Figure 2(a), 2(b), 2(c), 2(d).
OUTPUT FREQUENCY
Specified
Actual
Error %
R1
697
R2
770
R3
852
R4
941
C1
1209
C2
1336
C3
1477
699
766
848
948
1216
1332
1472
+0.28
-0.52
-0.47
+0.74
+0.57
-0.30
-0.34
I Pulling the mode pin to VSS places the dialer in tone mode.
Pulling the mode pin to VDD places the dialer in pulse mode
and the dialing rate is 10 ppS.
Floating the mode pin places the dialer in pulse mode and the
dialing rate is 20 ppS.
-4-
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