W91340N Datasheet, PDF (3/15 Pages) Winbond – 10-MEMORY TONE/PULSE DIALER WITH HANDFREE AND HOLD FUNCTION

W91340N SERIES
Pin Description, continued
SYMBOL 18-PIN 20-PIN I/O
FUNCTION
DP
11
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).
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
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
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
NEXT STATE
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
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