EM91240 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
FUNCTION DESCRIPTIONS
Dialing signal selection
The EM91240 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
NR
Mode
20 PPS
Tone
MBR (%)
40:60
33:66
R-Vss
R-Vss
c. Flash time
ROW3
NR
NR
R-Vss
R-Vss
10 PPS
d. DTMF signal
ROW4
NR
R-Vss
NR
R-Vss
Tf (ms)
600
100
80
300
COL1
R-Vdd
NR
Td (ms) Titp (ms)
90
98
83
90
98
83
R-Vss
e. Pause time and P-T wait time
f. Keyboard operate type
COL2
NR
Tp (sec)
3.6
Tpt (ms)
3.6
COL3
NR
Type
A
R-Vss
2.0
2.0
R-Vss
B
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.
Redialing:
After normal dialing, directly keying F key (or On-Off hook once) and keying RD key on keyboard. The
numbers that are stored into LNB memory will be dialed output.
SAVE redial memory
The SAVE meomry is designed in EM91240 series to support 32 digits capacity buffer for second redial,
10.1.1997
* This specification are subject to be changed without notice.
4
ELAN [ ELAN MICROELECTRONICS CORP ]
