W91520N Datasheet, PDF (3/16 Pages) Winbond – TONE/PULSE DIALER WITH HANDFREE AND HOLD FUNCTION

W91520N SERIES
Pin Description, continued
SYMBOL 18-PIN
HKS
10
DP / C5
11
VDD, VSS
14, 6
20-PIN I/O
FUNCTION
12
I Hook switch input.
HKS = VDD: On-hook state. Chip in sleeping mode, no
operation.
HKS = VSS: Off-hook state. Chip is enabled for normal
operation.
HKS pin is pulled to VDD by internal resistor.
13
O N-channel open drain dialing pulse output.
Flash key will cause DP to be active in either tone
mode or pulse mode.
The timing diagram for pulse mode is shown in Figure
1(a, b, c).
16, 6
I Power input pins.
H/P MUTE
5
DTMF
12
5
O The H/P MUTE is a conventional inverter output.
During pulse dialing, flash break, one-key redial break,
and hold period, this output is active high; otherwise, it
remains in low state.
14
O In pulse mode, this pin remains in low state at all times.
In the tone mode, it will output a dual or single tone.
Detailed timing diagram for tone mode is shown in
Figure 2(a, b, c).
Output Frequency
Specified Actual Error %
R1
697
699
+0.28
R2
770
766
-0.52
R3
852
R4
941
C1
1209
848
948
1216
-0.47
+0.74
+0.57
C2
1336
C3
1477
1332
1472
-0.30
-0.34
Publication Release Date: May 1997
-3-
Revision A3