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EM91401C 데이터시트 PDF




ELAN Microelectronics에서 제조한 전자 부품 EM91401C은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 EM91401C 기능
기능 TONE/PULSE SWITCHABLE DIALER
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EM91401C 데이터시트, 핀배열, 회로
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




EM91401C pdf, 반도체, 판매, 대치품
Symbol
HKS
PO
HDO
SDO
DRING
RMUTE
EM91401 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
Preliminary
Function
Control signal inputs pin that is corresponding hook switch status. When handset was
left from cradle, this pin must be connected to “Low” level to operate all functions.
Otherwise, this pin must be connected to “High” level to disable all function and
prevent power consumption.
Pulse signal outputs pin that is NMOS open-drain output structure. Normally, this pin
stays “High impedance” level. In Pulse dialing mode and keypad was entry. This pin
will output pulse trains signal that is corresponding to keyboard 0 .. 9 keys.
Hold function output that is CMOS structure.Normally, this pin stays “Low” level.
When Hold function is executing, this pin will output “High” level. This pin is
designed to drive LED or peripheral circuit to indicate line is at Hold status.
SDO function output that is NMOS open-drain structure. When there is a valid entry
on keyboard, this pin will output a serial data. This serial data is designed to drive LCD
driver to display dialing number on LCD screen or drive voice synthesizer to announce
dialing number to speaker.
The ring signal detect input pin which is internal pull up (built-in 100 Kohms resistor).
While the Tel-ring is incoming, this pin must be connected to “Low” with delay to
indicate the ringing . Otherwise, this pin must be connected to “High” level .
Ring mute output pin that is NMOS open-drain structure. The RMUTE pin is
designed to control microphone of handset to prevent the illegal dialing from pocket
dialer. If the DRING pin is at “High” level , then Off-Hook or turn on Handfree , this
pin will output “Low” level. In other words, the DRING pin is used to check the phone
that receives an incoming call (DRING =Low input) or make an outgoing call
(DRING= High input) . If the phone user make an outgoing call ,then RMUTE pin
activated to prevent the illegal dialing from pocket dialer in the particular application.The
RMUTE can be restored to “High” level when the first key entry is not the optioned
lock-number .
* This specification are subject to be changed without notice.
10.1.1997 4

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EM91401C 전자부품, 판매, 대치품
EM91401 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
• Turn on Handfree (HF) functionP. (rHeFlOimpininswaitrchyed to “High”)
Special Note:
A 300 ms delay time (Tdly) at the first Off-Hook or turn on Handfree that is a special designed to avoid a rapid
key entry (dummy number ) in this time duration ,and a long distance call number follows. For example,
Off-Hook , “3” ,............ , “0” ,1,2,3......
Dummy key Lock number key
The dummy number “3” is not detected by the centered office or PABX ,but the following numbers “0” ,1,2,3...
long distance call can be dialed out normally since the leading number “3” is not the Lock-number defined in
EM91401 series. To prevent the unavoidable long distance call, then EM91401 inhibits the key entry during
Tdly.
Operating flow chart
HF
HF
1
On-hook state
HKS=Lo
HKS=Hi
4
On-hook
Hand-free state
HKS=Lo
2
Off-Hook state
HD HF
HKS=Hi
3
Off-Hook
Hand-free state
HF
HF
HD HD
HD 6
OONf-f-HHooookk
HHooldld--lliinnee staattee
HF
HD
HKS=Hi
HKS=Lo
5
Off-Hook
Hold-free state
<Note> : HF = Handfree
HD = Hold
Truth table
Operating state
(1) On-hook, idle state
(2) Off-hook line
HKS
H
L
Input/Output pin level
PO XMUTE
HFO
FF
L
FF
L
(3) Off-hook, HF line
LF
F
H
(4) On-hook, HF line
HF
F
H
(5) Off-hook, HD line
LF
L
L
(6) On-hook, HD line
HF
L
L
Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level.
HDO
L
L
L
L
H
H
Music on Hold
EM91401 series built-in a melody generator to generate dual-tone music on DTMF output pin. The music is
designed for telephone line at line holding.
* This specification are subject to be changed without notice.
10.1.1997 7

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