W91590 SERIES
- 4 -
Pin Description, continued
SYMBOL 22-PIN 24-PIN 28-PIN I/O FUNCTION
17
(For
W91590L)
19
(For
W91590AL)
22
(For
W91590BL/CL)
I The function of this pin is as follows:
LOCK PIN
FUNCTION
V
DD
Floating
V
SS
"0","9" dialing inhibited
Normal dialing
"0" dialing inhibited
DTMF 14 16 18 O In pulse mode, remains in low state at all
times. In tone mode, outputs a dual or single
tone. Detailed timing diagram for tone mode
is shown in Figure 2.
OUTPUT FREQUENCY
Specified Actual Error%
R2
R3
R4
C1
C2
C3
697
770
852
941
1209
1336
1477
699
766
848
948
1216
1332
1472
+0.28
-0.52
-0.47
+0.74
+0.57
-0.30
-0.34
R1
VDD, VSS 16, 8 18, 8 20, 10 I Power input pins.
, HFO
- 12, 13 14, 15 I, O Handfree control pins. A low pulse on the
input pin toggles the handfree control
state. Status of the handfree control state is
listed in the following table:
CURRENT STATE
Hook SW.
-
On Hook
Off Hook
On Hook
Off Hook
Off Hook
HFO
Low
High
Low
High
High
-
Input
Off Hook
On Hook
On Hook
HFO
High
Low
High
Dialing
Yes
No
Yes
Yes
Yes
No
NEXT STATE
HFI
Low
Low
Low
pin is pulled to VDD by internal resistor.
The detailed timing is shown in Fig 3.
KT - - 9 O Key tone signal output. A key tone will be
generated whenever a valid keys is pressed.
Frequency is 600 Hz and duration is 35 mS.
