EM91401CP

Manufacturer Part NumberEM91401CP
DescriptionTone/pulse switchable dialer with LCD interface and dual tone melody generator
ManufacturerELAN Microelectronics Corp
EM91401CP datasheet
 


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Special Note

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• Turn on Handfree (HF) function. (HFO pin switched 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
HD
<Note> : HF = Handfree
HD = Hold
Truth table
Operating state
(1) On-hook, idle state
(2) Off-hook line
(3) Off-hook, HF line
(4) On-hook, HF line
(5) Off-hook, HD line
(6) On-hook, HD line
Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level.
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.
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
1
HF
HKS=Hi
HF
On-hook state
4
HKS=Lo
On-hook
Hand-free state
3
HKS=Hi
HF
HF
HD
Off-Hook
HF
Hand-free state
6
HF
HD
ON-Hook
Off-Hook
HKS=Hi
Hold-line state
Hold-line state
HKS=Lo
Input/Output pin level
HKS
PO
XMUTE
H
F
F
L
F
F
L
F
F
H
F
F
L
F
L
H
F
L
EM91401 SERIES
HKS=Lo
2
Off-Hook state
HD HD
5
Off-Hook
Hold-free state
HFO
HDO
L
L
L
L
H
L
H
L
L
H
L
H
10.1.1997
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