Encoder / Decoder IC’s
RF803
Features
•
•
•
•
•
•
•
•
•
•
•
•
3 digital I/O
Serial Data output
Connects directly to RF Modules
Easy Enc / Dec Pairing Function
Minimal External Components Required
Performs all encoding/decoding of data for Reliable Operation.
Achieves Maximum Range From RF Modules
Fast Activation / Deactivation Time
Up to 15 Transmitter Pairings
Compatible with FireFly, FireBlade and 205 series Transmitters
Sleep mode, for battery saving
One to many / many to one relationship.
1
RF803E
6
2
5
3
4
Applications
1
8
•
•
•
Remote control
Radio Telemetry
RFID
2
RF803D
3
7
6
4
5
Description
The RF803 series are encoder and decoder devices. When combined with a Radio
transmitter/receiver they may be used to create a remote control system with up to 3 I/O lines.
The decoder IC incorporates an ‘easy learn’ pairing procedure to create a relationship between
encoder and decoder.
RF800 Series ICs perform all the necessary data manipulation and encoding/decoding of data
for an optimum range reliable radio link whilst providing a simple user interface.
In addition all RF800 series chipsets compatible with the RF Solutions range of remote control
transmitter or receiver meaning that custom designs using any RF800 part can be used with an
off the shelf counterpart.
Part Number
RF803E
RF803D
Description
Encoder IC
Decoder IC, 8 pin
Packages available
6 PIN SOT23
8 PIN PDIP
8 PIN SOIC
8 PIN PDIP
DS803-7 April 04
©2008 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
Page 1
Encoder / Decoder IC’s
Transmitter Encoder RF803E
Functional Description
RF803
The RF803E is a simple device to use. As shown in the application circuit below, it requires only the
addition of input switches and RF circuitry for use as the transmitter in the end application.
Transmission is automatic without user intervention.
On detecting a switch closure The RF803E will wake up transmit a secure data packet on the TX
output.
The RF803E uses a fully balanced Manchester encoded data protocol designed for optimum use of
the radio transmission path.
Each RF803E is programmed at the time of manufacture with a unique 16-bit serial number, which
provides a secure way of addressing RF800 series devices. This provides up to 65,536 possible
addresses.
Compatibility with RF Solutions Receivers
The RF803 series are compatible with the FireFly/FireBlade series and 210-433/525/458 series of
ready to operate receiver decoder units.
This enables a designer to easily integrate a remote control function into an application using a
ready made receiver
DS803-7 April 04
©2008 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
Page 2
Encoder / Decoder IC’s
Pin Descriptions RF803E
See Page 8 for typical application circuit
N/C
1
8
IP 3
RF803
VCC
2
RF803E
PDIP
DFN
7
GND
TX
3
6
N/C
IP 2
4
5
IP1
SOT23
Pin
Number
1
3
6
2
4
5
PDIP
Pin
Number
1
2
3
4
5
6
7
8
Name
IP 1
IP 2
IP 3
GND
TX
Vcc
Input /
Output
IP
IP
IP
IP
OP
IP
Description
Switch input 1 (active low)
Switch input 2 (active low)
Switch input 3 (active low)
Supply GND
Data output
Supply Voltage
Name
-
Vcc
TX
IP 2
IP1
-
GDN
IP3
Input /
Output
-
IP
OP
IP
IP
-
OP
IP
Description
Not Connected
Supply Voltage
Data output
Switch input 2 (active low)
Switch Input 1 (active low)
Not Connected
Ground Connection
Switch Input 3 (active low)
IP 1-3
These are the switch inputs which when operated wake up the RF803E and cause transmission.
They may be switched directly to Ground. Transmission occurs for the duration of the switch
operation.
Vcc
The power supply needs to be a stable regulated voltage between 2.5 and 5.5V with <10mV ripple.
Note that in idle mode the transmitter current drain is typically only 100nA.
GND
Ground connection
TX
Data Output, this is a standard CMOS / TTL output that may be connected directly to the data input
pin of the RF Module. In the event that this represents a load to Vcc then a buffer stage between
the data output and the RF module will be required.
DS803-7 April 04
©2008 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
Page 3
Encoder / Decoder IC’s
Receiver Decoder RF803D
RF803
Functional Description
The RF803D is simple to use. As shown in the typical application circuits, in the stand alone
operation the RF803D has the capability to learn up to 15 unique RF803E transmitters.
Vcc
STATUS LED
LEARN
RF806D
SERIAL DATA
MOM/LATCH
O/P 1
O/P 2
O/P 3
DATA IN
GND
The RF803D is connected directly to the data output of a radio receiver module and upon detection
of a valid data packet it will decode the data stream. The RF803D will then assert its digital outputs
which will match the state of the RF803E encoders’ learnt at the time of transmission.
The digital outputs may be configured as latching or momentary action.
Latch = the output will change state on each successive transmit of the encoder.
Momentary = the output will only operate for as long as the RF803E encoder is transmitting.
The RF803D requires only the addition of the following components
1. A
‘Learn’ switch
which is used in the process of learning a transmitter/encoder to the decoder
and also to initiate erasure of encoder information.
2. An
LED
which indicates the status of the learn process, the erase process and also data
reception status.
3. An
Option link
which configures the action of the digital outputs. This input may simply be tied
to Vcc or GND.
Compatibility with RF Solutions Transmitters:
The RF803 series are compatible with the FireFly/FireBlade series and 205 series of ready to
operate transmitter encoders (when using FM)
This enables a designer to integrate a remote control function into an application easily, by using a
ready made transmitter.
DS803-7 April 04
©2008 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
Page 4
Encoder / Decoder IC’s
Pin Descriptions RF803D
See Page 8 for application circuit example
RF803
SOIC / PDIP
Pin
Number
Name
Input /
Output
Description
7
6
5
1
8
2
3
4
OP1
OP2
OP3
Vcc
Vss
SD/ML
LRN
Rx
Out
Out
Out
In
In
In/Out
In/Out
In
Digital Output 1
Digital Output 2
Digital Output 3
Supply Voltage
Supply GND
Serial Data Output / Momentary / Latching setting
Learn / Erase Function
Rx Data input
Vcc
2.5-5.5V DC input. The power supply needs to be a stable regulated voltage with <10mV ripple
GND
Ground connection.
OP1-3
These outputs are asserted LOW when the relevant inputs (S1 – S3) on the RF803E are asserted.
(see latch/unlatch information under ‘LKIN’).
RX DATA
This is the data input to the decoder it may be connected directly to the RF receiver module.
LRN
This input is used to set the decoder module to ‘Learn Mode’ and for the ‘Erase Function’ and is
also used to drive the Status LED.
SERIAL / OP TIMING
Multi-functional pin
This pin is read on power up to sets the action of outputs 1-3, Momentary action is set by a
connection to ground through a 2K2 ohm resistor, latching is set using open circuit.
In normal run mode this pin outputs serial data on reception of a valid data string.
DS803-7 April 04
©2008 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
Page 5
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