EM91420 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
FUNCTION DESCRIPTIONS
Dialing signal selection
The EM91420 series incorporated a special keyboard scanning function that is connecting a resistor (typically
is 560 Kohms) on keyboard scan pin to select many telephone specifications. The specifications are described
as following :
a. Mode
ROW1
R-Vdd
NR
b. M/B ratio
ROW2
MBR (%)
NR
40:60
R-Vss
33:66
d. Lock control method
COL1
Control method
R-Vdd
key lock
NR
none lock
R-Vss
password lock
Mode
20 PPS
Tone
R-Vss
10 PPS
c. Flash time
ROW3
ROW4
NR
NR
NR
R-Vss
R-Vss
NR
R-Vss
R-Vss
e. Lock number
COL2
COL3
NR
NR
NR
R-Vss
R-Vss
NR
R-Vss
R-Vss
Tf (ms)
600
100
80
300
Lock number
none
0
9
0.9
Normal dialing
Directly keying digital key on keyboard which number can be dialing output and stored in LNB memory
automatically. Operating procedure described as follow :
• To select Pulse or Tone mode.
• Off-hook or turn on HF function.
• Keying d1, d2, .. , dn. The “d” expressed digital keypad that included 1~9, *, 0, #, P, and P→T keys. The “n”
expressed unlimited.
• The numbers d1, d2, .. , dn will be dialed out in Pulse or Tone mode as selection.
LNB redial memory
Storing:
In normal dialing mode, every digital key was entry which number will be stored in LNB memory
automatically. If entry digits are more than 32 digits, the redial function of LNB memory will be disabled.
Otherwise, these numbers stored in LNB memory can be redial output.
* This specification are subject to be changed without notice.
10.1.1997
5
EMC [ ELAN MICROELECTRONICS CORP ]
