W91350N Datasheet, PDF (3/16 Pages) Winbond – 13-MEMORY TONE/PULSE DIALER WITH HANDFREE AND HOLD FUNCTION

W91350N SERIES
Pin Description, continued
SYMBOL 18-PIN 20-PIN I/O
FUNCTION
DP / C5
11
13 O N-channel open drain dialing pulse output.
Flash key will cause DP / C5 to be active in either tone
mode or pulse mode.
The timing diagram for pulse mode is shown in Figure 1(a, b, c).
VDD, VSS 14, 6 16, 6 I Power input pins.
DTMF
12
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).
Output Frequency
Specified Actual Error %
R1
697
R2
770
699
+0.28
766
-0.52
R3
852
848
-0.47
R4
941
C1
1209
C2
1336
C3
1477
948
1216
1332
1472
+0.74
+0.57
-0.30
-0.34
HFI, HFO
-
10, 11 I, O Handfree control pins. The handfree control state is 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
Hook SW.
HFO
Low
On Hook
High
Off Hook
High
On Hook
Off Hook
Off Hook
Low
High
NEXT STATE
Input
HFO
HFI
High
HFI
Low
HFI
Low
Off Hook Low
On Hook Low
On Hook High
Dialing
Yes
No
Yes
Yes
No
Yes
H/P MUTE 5
HFI pin is pulled to VDD by an internal resistor.
Detailed timing diagram is shown in Figure 3.
5 O The H/P MUTE is a conventional inverter output. During
pulse dialing, flash break or hold period, this output is active
high; otherwise, it remains in low state.
Publication Release Date: May 1997
-3-
Revision A2