EM91240AP EMC [ELAN Microelectronics Corp], EM91240AP Datasheet - Page 6

• Manufacturer Part Number: EM91240AP
• Description: TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
• Manufacturer: EMC [ELAN Microelectronics Corp]

* This specification are subject to be changed without notice.
Pause (P) key operation
The Pause (P) key is designed to support pause operation in dialing duration. “P” key can be stored in memory
and it will occupy one digital position.
Pulse to Tone (*/T or P-T) key operation
The Pulse to Tone (*/T or P-T) key is designed to support toll dialing (long distance call) or PABX system
operation. The "*/T (or P-T)" key can be stored in memory and it will occupy one digital position.
Flash (F) key operation
The Flash (F) key is designed to break telephone line temporarily. After F key is depressed, this dialer will send
a flash signal to break line 600 ms, 300 ms, 100 ms or 80 ms as ROW3 and ROW4 selection.
Handfree (HF) function
The handfree function is designed to support on-hook dialing and loudspeaker application which can be turn “on”
or “off” with falling edge signal from HFI pin. During handfree function is executed, the HFO pin is switched
to “high”. Otherwise the HFO pin stays “low” level.
SDO (Serial Data Output) function
The SDO is serial data output which format is same as UART protocol. SDO function is designed to drive LCD
driver and voice synthesizer. So the dialing numbers can be display on LCD screen with EM32100 (or EM32116
). The SDO signal consists of two start bits, six data bits and two stop bits. Each bit time is about 3.9 ms (256 Hz)
and output sequences are following by start bits, data bits (LSB to MSB) and stop bits.
Truth table
• To select Pulse or Tone mode.
• Off-hook (or turn on HF function), push d1, d2, .. , dn, RD/P, k1, k2, .. , kn . These numbers will be dialed
• To select Pulse mode.
• Off-hook (or turn on HF function), push d1, d2, .. , dn, */T, (or P-T) k1, k2, .. , kn. These numbers will be dialed
out as following sequence:
out as following sequence:
(0) On-hook, idle state
(1) Off-hook line
(2) Off-hook, HF line
(3) On-hook, HF line
Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level.
Operating state
d1, d2, .. , dn, Tp, k1, k2, .. , kn.
d1, d2, .. , dn, Tpt, k1, k2, .. , kn.
(pulse mode)
HKS
H
H
(tone mode)
L
L
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
PO
F
F
F
F
Input/Output pin level
XMUTE
F
F
F
F
PM
L
L
L
L
EM91240 SERIES
HFO
H
H
L
L
10.1.1997
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