Preliminary W91560DN SERIES
- 4 -
Pin Description, continued
SYM.
PIN NO.
I/O
FUNCTION
MODE
12
I
Pulling the mode pin to V
SS
places the dialer in tone mode.
Pulling the mode pin to V
DD
places the dialer in pulse mode (10
ppS, M/B = 2:3).
Floating the mode pin places the dialer in pulse mode (10 ppS, M/B
= 1:2).
HFI
,
HFO
25, 10
I, O
Handfree control pins. A low pulse on the
HFI
input pin toggles
the handfree control state.
Status of the handfree control is listed in the following table:
CURRENT STATE
Input
HFO Dialing
High
Yes
On Hook
High
Low
No
Off Hook
High
Low
Yes
On Hook
Off Hook
Low
Yes
Off Hook
Low
On Hook
Low
No
Off Hook
High
On Hook
High
Yes
Low
Hook SW.
HFO
NEXT STATE
HFI
HFI
HFI
HFI
pin is pulled to V
DD
by internal resistor.
Detailed timing diagrams are shown in Figure 4(a), 4(b).
DP
/
C6
11
O
This pin is a CMOS N-channel open drain output. The flash key will
cause
DP
to go active in either pulse mode or tone mode. In lock
mode, the
DP
keeps low for 300 mS during off-hook delay time.
The timing diagram is shown as Figure 1(a), 1(b), 1(c), 1(d).
DTMF
6
O
In pulse mode, this pin remains in low state at all times.
In tone mode, it will output a dual or single tone. The detailed
timing
diagram for tone mode is shown in Figure 2(a), 2(b), 2(c), 2(d).
Specified
Actual
Error %
Output Frequency
+0.28
R1
R2
R3
R4
C1
C2
C3
697
770
852
941
1209
1336
1477
699
766
848
948
1216
1332
1472
-0.52
-0.47
+0.74
+0.57
-0.30
-0.34
V
LCD
29
O
Power supply pin for LCD driver.
A 0.1
µ
F capacitor is connected between V
LCD
and V
SS
.
