July 1998
Revision 5
24000828
ADVANCE INFORMATION
Technical Data Sheet
SSC P485 PL Transceiver IC
Features
Enables low-cost networking products
Spread Spectrum Carrier
TM
communication technology
9600 baud data rate
Simple interface
Single +5 Volt power supply requirement
20 pin SOIC package
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
TM
(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
Clock Circuit
XOUT
XIN
4 MHz
Binary Shift
Register
Summation
Encoder
Tracking & Data
Extraction Logic
Data Decode
Logic
RX Interface Logic
Comp
Amp
RST*
ILD
RO
C2
C1
SI
TS Control
Waveform
Generator
TX Interface Logic
DAC
Buf
SO
TS*
DI
WL
SO
C2
VDD
D
VSS
D
XIN
XOUT
NC
VDD
A
TP0
4MHZ
C1
18
17
16
15
14
3
4
5
6
7
SI
VSS
D
VSS
A
DI
RO
2
19
20
1
WL
ILD
P485
TS*
8
9
10
13
12
11
RST*
SSC
SSC P485 PL Transceiver IC
July 1998
2
Revision 5
24000828
ADVANCE INFORMATION
Absolute Maximum Ratings (1)
Symbol
Parameter
Value
Unit
V
DDMAX
DC Supply Voltage
-0.3 to 7.0
V
V
IN
Input Voltage at any Pin
V
SS
-0.3 to V
DD
+0.3
V
T
STG
Storage Temperature
-65 to +150
C
T
L
Lead Temperature (Soldering, 10 seconds)
300
C
Notes:
1. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Recommended Operating Conditions
Symbol
Parameter
Min
Typical
Max
Unit
V
DD
DC Supply Voltage
4.5
5.0
5.5
V
F
OSC
Oscillator Frequency
12
0.05%
MHz
T
A
Operating Temperature
-40
+25
+85
C
Humidity (non-condensing)
95
%
Electrical Characteristics
Conditions: V
DD
= 4.5 to 5.5 V T= -40 to +85
C
Symbol
Parameter
Min
Typical
Max
Units
V
OH
Minimum High-level Output Voltage
2.4
V
V
OL
Maximum Low-level Output Voltage (1)
0.4
V
V
IH
Minimum High-level Input Voltage
2.0
V
V
IL
Maximum Low-level Input Voltage
0.8
V
I
IL
Maximum Input Leakage Current
10
A
v
SO
SSC Signal Output Voltage (2)
4
V
P-P
I
DD
Total Power Supply Current
15
mA
Notes:
1. TS*
pin
I
OL
= 4 mA, all other outputs I
OL
= 2 mA
2. Z
L
= 2K
|| 10 pF
SSC P485 PL Transceiver IC
July 1998
3
Revision 5
24000828
ADVANCE INFORMATION
SSC P485 Pin Assignments
Pin
Mnemonic
Name
Description
1
4MHZ
4 MHz Clock Out
4 MHz clock output available for host microcontroller.
2
NC
No Connect
3
VSS
D
Digital Ground
Digital ground reference.
4
XIN
Crystal Input
Connected to external crystal to excite the IC's internal
oscillator and digital clock.
5
XOUT
Crystal Output
Connected to external crystal to excite the IC's internal
oscillator and digital clock.
6
VDD
D
Digital Supply
5.0 VDC
10% digital supply voltage with respect to
VSS
D
.
7
ILD
Idle Line Detect
Digital output, active high. Logic 1 state indicates 10 bit
times of idle line, logic 0 indicates detection of carrier or
non-idle line.
8
DI
Driver Input
Digital input. After the preamble, a low on DI (SPACE)
transmits a superior2 state on SO, a high on DI (MARK)
transmits a superior1 state on SO.
9
RO
Receiver Output
Digital output. After the preamble and assuming
standard polarity: if superior1 state is detected on SI,
RO will be high (MARK), if superior2 state is detected
on SI, RO will be low (SPACE).
10
WL
Word Length
Digital input. Logic 1 (default, internal pullup) selects
10-bit frame (START, eight data bits, STOP), logic 0
selects 11-bit frame (START, nine data bits, STOP).
11
TS*
Tristate
Active low digital output. Enables the external output
amplifier when driven high. Tri-states the external
output amplifier when driven low.
12
RST*
Reset
Active low digital input. RST* asynchronously forces
RO and ILD outputs to a high state and TS* to a low
state. RST* can be asserted anytime during normal
operation to force the reset state. RST* must be active
(low) for 1
sec after VDD
D
and VDD
A
stabilize and the
crystal oscillator stabilizes to guarantee the internal
reset state. See Figure 10.
13
VSS
A
Analog Ground
Analog ground reference.
14
SO
Signal Output
Analog signal output. Tri-state enabled with internal
signal.
15
C2
Capacitor 2
Connection for 680pF capacitor to ground.
16
C1
Capacitor 1
Connection for 680pF capacitor to ground.
17
SI
Signal Input
Analog signal input.
18
VDD
A
Analog Supply
5.0 VDC
10% analog supply voltage with respect to
VSS
A
.
19
TP0
Test Point 0
Reserved pin for testing.
20
VSS
D
Digital Ground
Digital ground reference.
SSC P485 PL Transceiver IC
July 1998
4
Revision 5
24000828
ADVANCE INFORMATION
SSC P485 Application Examples
The SSC P485 may be used in a wide variety of applications. A typical node connecting to the medium is shown
in Figure 1. A gateway between an RS485 twisted pair network and a DC power line network is shown in Figure
2. A multi-point network application with gateways using the SSC P485 is illustrated in Figure 3. Figure 4
presents a host interface flow diagram showing the major steps necessary to transmit and receive messages
using the P485 IC.
Microprocessor
based Control
Logic
Single
W ire
ILD
W R
RD
SSC P485 PL
Transceiver
SSC P111
Power Line Media
Interface
SO
TS*
SI
DI
RO
input
filter
output
filter
medium
coupler
Figure 1. SSC P485 Typical Node
Microprocessor
based Control
Logic
UART
UART
+
-
D
DE
R
RE*
A
B
RS-485 Transceiver
Twisted
Pair
Single
W ire
Transmit Enable #1
RXD #1
RXD #1
TXD #1
ILD
RXD #2
TXD #2
RXRDY #2
TXRDY #2
DATA 0-7
RXRDY #1
TXRDY #1
TXD #1
RD #1
RD #2
W R #1
W R #2
SSC P485 PL
Transceiver
SSC P111
Power Line Media
Interface
SO
TS*
SI
ILD
DI
RO
input
filter
output
filter
medium
coupler
Figure 2. SSC P485 Gateway
SSC P485 PL Transceiver IC
July 1998
5
Revision 5
24000828
ADVANCE INFORMATION
host
micro
P485
IC
host
micro
P485
IC
gate
way
micro
RS485
IC
P485
IC
gate
way
micro
RS485
IC
P485
IC
RS485
device
RS485
device
RS485
device
RS485
device
RS485
device
RS485
device
gateway
gateway
DC power line
P111
IC
P111
IC
P111
IC
P111
IC
Figure 3. SSC P485 Multi-point Network Application
PDF 
ZIP