W91330N SERIES
Pin Description, continued
SYMBOL
18-PIN
12
20-PIN
I/O
FUNCTION
DTMF
14
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, b, c, d).
Output Frequency
Specified
697
Actual
699
Error %
R1
R2
+0.28
-0.52
770
766
R3
R4
C1
C2
C3
-0.47
+0.74
+0.57
852
941
848
948
1209
1216
-0.30
-0.34
1336
1477
1332
1472
-
10, 11
I, O
Handfree control pins. The handfree control state is
HFI, HFO
toggled on by a low pulse on the HFI input pin. The
status of the handfree control state is described in
the following table:
CURRENT STATE
NEXT STATE
HFO Dialing
Hook SW.
Input
HFO
Low
High
Low
Yes
No
HFI
High
On Hook
Off Hook
HFI
Low
Low
Low
High
Yes
Yes
No
High
HFI
On Hook
Off Hook
Off Hook
Off Hook
Low
On Hook
On Hook
High
Yes
HFI pin is pulled to VDD by internal resistor.
Detailed timing diagrams are shown in Figure 3.
KT
5
5
O
Key-tone signal output. The key tone is generated
for all valid keys. Frequency is 600 Hz and duration
is 35 mS.
(except
W91330LN)
(except
W91330ALN)
- 4 -
WINBOND [ WINBOND ]
