W91550DN SERIES
- 4 -
Pin Description, continued
SYMBOL
PIN
I/O
FUNCTION
DTMF
35
O
In pulse mode, this pin remains in low state at all times.
In tone mode, it will output a dual or single tone. A detailed timing
diagram for tone mode is shown in Figure 2(a), 2(b), 2(c) 2(d).
Specified
Actual
Error %
Output Frequency
R1
R2
R3
R4
C1
C2
C3
697
770
852
941
1209
1336
1477
699
766
848
948
1216
1332
1472
+0.28
-0.52
-0.47
+0.74
+0.57
-0.30
-0.34
V
DD
,
V
SS
38, 34
I
Power input pins.
B/M
36
I
Make: Break ratio select pin.
If B/M = V
DD
, the M/B ratio is 40:60.
If B/M = V
SS
, the M/B ratio is 33.3:66.7.
B/M pin is pulled to V
DD
by internal resistor.
S/
M
26
I
Save and mercury select pin.
If S/
M
= V
DD
, the save function is selected.
If S/
M
= V
SS
, the mercury function is selected.
S/
M
pin is pulled to V
DD
by internal resistor.
ATS
41
I
If ATS = V
DD
, the auto timer function is enabled.
If ATS = V
SS
, the auto timer function is disabled.
ATS pin is pulled to V
DD
by internal resistor.