W91590 Datasheet, PDF (4/20 Pages) Winbond – 24-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE, HOLD AND LOCK FUNCTIONS

W91590 SERIES
Pin Description, continued
SYMBOL 22-PIN 24-PIN
28-PIN I/O
FUNCTION
LOCK
17
19
22
I The function of this pin is as follows:
(For
(For
(For
W91590L) W91590AL) W91590BL/CL)
LOCK PIN
VDD
FUNCTION
"0","9" dialing inhibited
Floating
Normal dialing
VSS
"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%
R1
697
699
+0.28
R2
770
766
-0.52
R3
852
848
-0.47
R4
941
948
+0.74
C1
1209
1216
+0.57
C2
1336
1332
-0.30
C3
1477
1472
-0.34
VDD, VSS 16, 8
HFI, HFO
-
18, 8
12, 13
KT
-
-
20, 10
14, 15
9
I Power input pins.
I, O Handfree control pins. A low pulse on the
HFI input pin toggles the handfree control
state. Status of the handfree control state is
listed in the following table:
CURRENT STATE
NEXT STATE
Hook SW. HFO Input
HFO Dialing
-
Low _HFI
High
Yes
On Hook High _HFI
Low
No
Off Hook High _HFI
Low
Yes
On Hook
- Off Hook Low
Yes
Off Hook Low On Hook Low
No
Off Hook High On Hook High
Yes
HFI pin is pulled to VDD by internal resistor.
The detailed timing is shown in Fig 3.
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.
-4-