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PDF P485 Data sheet ( Hoja de datos )
| Número de pieza | P485 | |
| Descripción | SSC P485 PL Transceiver IC | |
| Fabricantes | ETC | |
| Logotipo |  |
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Technical Data Sheet
SSC P485 PL Transceiver IC
Features
• Enables low-cost networking products
• Spread Spectrum Carrier™ communication technology
• 9600 baud data rate
• Simple interface
• Single +5 Volt power supply requirement
• 20 pin SOIC package
4MHZ 1
NC 2
VSSD 3
XIN 4
XOUT 5
VDDD 6
ILD 7
DI 8
RO 9
WL 10
SSC
P485
20 VSSD
19 TP0
18 VDDA
17 SI
16 C1
15 C2
14 SO
13 VSSA
12 RST*
11 TS*
Introduction
The Intellon SSC P485 PL Transceiver IC is a highly integrated spread spectrum communication transceiver for
implementing low-cost networking products. The SSC P485 contains a Spread Spectrum Carrier™ (SSC)
transceiver, signal conditioning circuitry, and a simple host interface. A minimum of external circuitry is required
to connect the SSC P485 to the DC power line, twisted pair cable, or other communication medium.
The inherent reliability of SSC signaling technology provides substantial improvement in network and
communication performance over other low-cost communication methods. The SSC P485 is the ideal basic
communications element for a wide variety of low-cost networking applications.
SSC P485 Block Diagram
RST*
ILD
RO
WL
DI
4 MHz
XIN
XOUT
RX Interface Logic
Data Decode
Logic
Tracking & Data
Extraction Logic
Summation
Encoder
TX Interface Logic
Clock Circuit
Binary Shift
Register
Waveform
Generator
Comp
DAC
Amp
Buf
TS Control
C2
C1
SI
SO
TS*
July 1998
ADVANCE INFORMATION
Revision 5
24000828
1 page  
SSC P485 PL Transceiver IC
host
micro
P485
IC
P111
IC
DC power line
P111
IC
P485
IC
host
micro
RS485
IC
gateway
gate
way
micro
P485
IC
P111
IC
P111
IC
gateway
P485
IC
gate
way
micro
RS485
IC
RS485
device
RS485
device
RS485
device
RS485
device
RS485
device
RS485
device
Figure 3. SSC P485 Multi-point Network Application
July 1998
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ADVANCE INFORMATION
Revision 5
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5 Page 
SSC P485 PL Transceiver IC
TM
Spread Spectrum Carrier Technology
TM
Spread Spectrum Carrier (SSC) Technology is a method of spread spectrum communications suitable for both
point-to-point or carrier sense multiple access (CSMA) networks. Historically, spread spectrum communication
systems have been used for secure communications and/or to overcome narrow-band impairments in the
communications medium. Spread spectrum receivers generally require an initial period of time to synchronize
with the carrier, so they have not been appropriate for CSMA networks. Spread Spectrum Carrier Technology is
a method by which a series of short, self-synchronizing, frequency swept "chirps" act as a carrier. The chirps are
always of the same known pattern and detectable by all of the nodes on the network. The chirp ranges in
frequency from 100 to 400 kHz over a duration of 100 µs. The chirp is swept from approximately 200 kHz to
400 kHz and then from 100 kHz to 200 kHz. Figure 8 illustrates the SSC power line chirp.
Figure 8. Spread Spectrum Carrier Chirp
Preamble Encoding
Two modulation schemes are used for symbol transmission by the physical layer. Amplitude Shift Keying (ASK)
is used in the preamble of the message packet. ASK modulation uses SUPERIOR and INFERIOR states to
encode symbols. A SUPERIOR state is represented by the presence of a chirp and an inferior state by the
absence of a chirp. Because the transmitter is quiet during inferior states, superior states transmitted by other
devices contending for the channel can be detected during the preamble of the packet. An example of ASK
modulation is shown in Figure 9. Note that in the preamble, the duration of a symbol is slightly longer than in the
body of the packet. A preamble symbol is 114 µs in length. Symbols in the sync sequence and the Packet Body
are 100 µs in length. Please note the “Chirp” is ALWAYS 100µs in length and is followed by 14 µs of quiet time
during the preamble.
Data Encoding
Phase Reversal Keying (PRK) utilizes two phases of the SUPERIOR state, SUPERIOR S1 and SUPERIOR S2,
which are 180° out of phase with one another, to modulate the encoded data. This modulation technique is more
robust than the ASK technique, because it allows the P485 to correlate and track each symbol rather than just
those encoded as SUPERIOR states. Figure 9 shows an example of PRK.
July 1998
11
ADVANCE INFORMATION
Revision 5
24000828
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet P485.PDF ] | |
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