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EM91440 Datasheet(PDF) 8 Page - ELAN Microelectronics Corp

Part # EM91440
Description  TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR
Download  24 Pages
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Manufacturer  EMC [ELAN Microelectronics Corp]
Direct Link  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM91440 Datasheet(HTML) 8 Page - ELAN Microelectronics Corp

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EM91440 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
8
* This specification are subject to be changed without notice.
10.1.1997
Operating flow chart
<Note> : HF = Handfree
HD = Hold
Truth table
Operating state
Input/Output pin level
HKS
PO
XMUTE
HFO
HDO
(0) On-hook, idle state
H
F
F
L
L
(1) Off-hook line
L
F
F
L
L
(2) Off-hook, HF line
L
F
F
H
L
(3) On-hook, HF line
H
F
F
H
L
(4) Off-hook, HD line
L
F
L
L
H
(5) On-hook, HD line
H
F
L
L
H
Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level.
Music on Hold
EM91440 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.
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.
0
1
bit 0
bit1
bit2
bit3
bit4
bit5
ready
start bits
data bits
0
1
stop bits
1
On-hook State
2
Off-hook State
4
On-hook
Hand-free State
HKS=Lo
HKS=Lo
HKS=Hi
HF
HF
HD
HF
HD
6
On-hook
Hold-line State
3
Off-hook
Hand-free State
HF
HF
HF
HD
HKS=Hi
HKS=Lo
5
Off-hook
Hold-line State
HD
HD
HKS=Hi


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