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EM91401A Schematic ( PDF Datasheet ) - ELAN Microelectronics

Teilenummer EM91401A
Beschreibung TONE/PULSE SWITCHABLE DIALER
Hersteller ELAN Microelectronics
Logo ELAN Microelectronics Logo 




Gesamt 23 Seiten
EM91401A Datasheet, Funktion
EM9E1M4901140S1ESRERIEIESS
TONE/PULTSOENSEW/PUITLSCEHSAWBITLCEHDAIBALLE EDRIAWLEIRTWHILTHCDLCIDNITNETRERFFAACCEE
AND DUAANDL-DTUOANLE-TOMNEELMOEDLYODGYEGNEENRERAATTOORR
Preliminary
GENERAL DESCRIPTION
The EM91401 is a series of tone/pulse switchable dialers that is composed of T/P dialer. The EM91401 series
provide necessary functions of telephone set for application in any environment, such as Pulse dialing, Tone
(DTMF) dialing, Handfree dialing, keying tone ,and lock functions. The lock function is designed to inhibit toll
dialing operation. Beside this, melody generator, ring detector and SDO (Serial Data Output) functions are
provided in advance version. Melody generator will output dual-tone music in line hold duration. Ring detector
can prevent illegal dialing from pocket dialer. The SDO is designed to drive LCD driver and voice synthesizer.
In this application, the dialing numbers can be displayed on LCD screen with EM32100 ( or EM32116 ).
FEATURES
• Tone/Pulse switchable.
Wide operating voltage from 2.0 V to 5.5 V.
Low operating current, 0.15 mA (Pulse) and 0.3 mA (Tone) typically.
• Adding resistor on keyboard scan pin that can select many telephone specifications, such as : Pulse rate,
M/B ratio, Flash time, lock dialing functions.
• SDO function supports LCD driver and voice synthesizer to indicate dialing numbers.
• Line hold function is designed for stopping conversation temporality.
• Melody generator provides music on hold function.
• Lock function provides conventionality key lock and password lock operations.
• Ring detector is designed to prevent illegal dialing from pocket dialer.
• A 32-digit LNB (last number) redial memory.
• Keytone function provides rapidly keying recognition.
• Handfree function provides on-hook dialing and speakerphone application.
• Pause and P-T time are fixed to 3.6 seconds.
• Tone duration and inter-tone pause time are fixed to 98 ms.
• Using 3.579545 MHz crystal or ceramic resonator.
• Package forms: PDIP, skinny.
ORDERING INFORMATION
Versions list and function outline
VERSION
LNB
KT
EM91401A
√√
EM91401B
√√
EM91401C
√√
EM91401D
√√
Note : PDP = Pocket Dialer Prevented
HOLD(music)
LOCK
HF SDO(LCD) PDP
√√
√√
* This specification are subject to be changed without notice.
10.1.1997 1






EM91401A Datasheet, Funktion
EM91401 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
Redialing:
Preliminary
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.
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.
• 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
out as following sequence:
d1, d2, .. , dn, Tp, k1, k2, .. , kn.
Pulse to Tone (*/T) key operation
The Pulse to Tone (*/T) key is designed to support toll dialing (long distance call) or PABX system operation.
The “*/T” key can be stored in memory and it will occupy one digital position.
• To select Pulse mode.
• Off-hook (or turn on HF function), push d1, d2, .. , dn, */T, k1, k2, .. , kn. These numbers will be dialed out
as following sequence:
d1, d2, .. , dn, Tpt, k1, k2, .. , kn.
(pulse mode)
(tone mode)
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. One of the following operations can turn off Handfree
function (HFO pin return to “Low”).
• On-off hook once.
• Trigger HFI pin with falling edge signal.
• Turn on Hold (HD) function. (HDO pin switched to “High”)
Hold (HD) function
The Hold function is designed to stop conversation temporarily. In off-hook state (or HF function is turned on),
to press HD key on the keyboard, the Hold function can be turned “on” (HDO pin switched to “High”). One of
the following operations can turn off Hold function (HDO pin switched to “Low”).
• On-off hook once.
• To press HD key over 93 ms.
* This specification are subject to be changed without notice.
10.1.1997 6

6 Page









EM91401A pdf, datenblatt
EM91401 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
Preliminary
DTMF output frequency (fosc = 3.579545 MHz)
Keyboard scan pin
ROW1 (f1)
ROW2 (f2)
ROW3 (f3)
ROW4 (f4)
COL1 (f5)
COL2 (f6)
COL3 (f7)
CCITT standard (Hz)
697
770
852
941
1209
1336
1477
Actual output (Hz)
699.1
766.2
847.4
947.9
1215.8
1331.6
1471.8
Deviation (%)
0.30
0.49
-0.53
0.73
0.56
-0.32
-0.35
* This specification are subject to be changed without notice.
10.1.1997 12

12 Page





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