ALPHA Encoder / Decoder IC’s
Features
RF803-ALPHA
EASY TO USE TELEMETRY SYSTEM USING ALPHA MODULES
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3 digital I/O
Serial Data output
Connects directly to ALPHA Modules
Easy Enc / Dec Pairing Function
Receiver Acknowledge Signal
Minimal External Components
Required
Performs all encoding/decoding of
data for Reliable Operation.
Fast Activation / Deactivation Time
Up to 30 Transmitter Pairings
Sleep mode, for battery saving
One to many / many to one relationship.
Applications
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Remote control
Radio Telemetry
RFID
Description
The RF803E/D-ALPHA series are powerful yet simple encoder and decoder devices. When combined
with an RF Solutions Ltd Alpha Module they may be used to create a remote control system with up to
3 I/O lines. The RF803E/D-ALPHA also offer a feedback function when used with ALPHA-TRX
(transceiver) module they can acknowledge all transmissions for ultimate reliability.
The decoder IC incorporates an ‘easy learn’ pairing procedure to create a relationship between
encoder and decoder.
RF803 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.
Part Number
RF803E-ALPHA
RF803E-ALPHA-SO
RF803E-ALPHA-SOT
RF803E-ALPHA-Q
RF803D-ALPHA
RF803D-ALPHA-SO
RF803D-ALPHA-SOT
RF803D-ALPHA-Q
Description
Encoder IC
Packages available
14 pin PDIP
SOIC
Tape & Reel
16 pin QFN
14 pin PDIP
SOIC
Tape & Reel
16 pin QFN
Decoder IC
DS803-ALPHA-1 Nov ‘09
©2008 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
Page 1
ALPHA Encoder / Decoder IC’s
Transmitter Encoder RF803E-ALPHA
RF803-ALPHA
Functional Description
The RF803E-ALPHA is a simple device to use. As shown in the application circuit below, it
requires only the addition of input switches and an ALPHA-TRX RF Module for use as the
transmitter in an end application. Transmission is automatic without user intervention.
The ID is designed to run in continuous sleep mode; on detecting a switch closure The
RF803E-APLHA will wake up transmit a secure data packet on the TX output.
The RF803E-ALPHA can be set as a simple transmit device, or, to expect an acknowledgement
signal back from the decoder.
The type of transmissions to send may also be configured
– Transmit only on state change,
– Transmit continuously whilst input is active.
Block Diagram
DS803-ALPHA-1 Nov ‘09
©2008 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
Page 2
ALPHA Encoder / Decoder IC’s
Pin Descriptions RF803E-ALPHA
RF803-ALPHA
SOIC/PDIP
Pin
Name
Number
1
VDD
2
ACK LED
3
TX LED2
4
ACK
5
CONT
6
CLK
7
IRQ
8
SDI
9
SDO
10
SEL
11
I/P3
12
I/P2
13
I/P1
14
Vss
VQFN
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Input / Output
-
O/P
O/P
I/P (*)
I/P (*)
O/P
I/P
I/P
O/P
O/P
I/P
I/P
I/P
-
Description
Voltage in +3.3V
ACKNOWLEDGE FAILED (ACTIVE HIGH)
TX LED (ACTIVE HIGH)
ACKNOWLEDGE REQUEST (ACTIVE LOW)
CONTINUOUS TX (ACTIVE LOW)
Clock TO ALPHA MODULE Pin 13
TO ALPHA MODULE Pin 2
Serial Data In TO ALPHA MODULE Pin 1
Serial Data Out TO ALPHA MODULE Pin 12
TO ALPHA MODULE Pin 14
Input 3
Input 2
Input 1
Ground
Name
ACK LED
TX LED2
ACK
CONT
CLK
IRQ
SDI
SDO
SEL
I/P3
I/P2
I/P1
Vss
Input / Output
O/P
O/P
I/P (*)
I/P (*)
O/P
I/P
I/P
O/P
O/P
I/P
I/P
I/P
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Description
ACKNOWLEDGE FAILED (ACTIVE HIGH)
TX LED (ACTIVE HIGH)
ACKNOWLEDGE REQUEST (ACTIVE LOW)
CONTINUOUS TX (ACTIVE LOW)
Clock TO ALPHA MODULE Pin 13
TO ALPHA MODULE Pin 2
Serial Data In TO ALPHA MODULE Pin 1
Serial Data Out TO ALPHA MODULE Pin 12
TO ALPHA MODULE Pin 14
Input 3
Input 2
Input 1
Ground
DO NOT CONNECT
DO NOT CONNECT
Voltage in +3.3V
VDD
-
(*) Pull up / Pull Down required.
DS803-ALPHA-1 Nov ‘09
©2008 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
Page 3
ALPHA Encoder / Decoder IC’s
RF803-ALPHA
IP 1-3
These are the switch inputs which when operated wake up the RF803E-ALPHA and cause
transmission. They may be switched directly to Ground. Transmission occurs for the duration of
the switch operation.
ACK FAILED LED
This Output is normally low, asserted High when a transmission fails. A transmission is re-tried
5 times when an acknowledgement is not immediately received. If none is received after the 5
re-try attempts, the Output will be asserted.
TX LED
While transmitting the TX output will toggle at high frequency (flicker LED) when the
transmission is finished the output will be asserted continuously for 2 seconds to show that an
acknowledgement has been received.
ACK – Acknowledge Request
This pin is used to set an acknowledgement request from the Receiver or not.
Only enable when using TRX modules.
CONT – Continuous TX
Low:
in this mode the RF803E-ALPHA will transmit continuously while an input is
asserted,
And stop when it is released.
High:
In this mode the RF803 will transmit only when an input changes state.
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
DS803-ALPHA-1 Nov ‘09
©2008 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
Page 4
ALPHA Encoder / Decoder IC’s
Application Circuit
RF803-ALPHA
Connecting to your ALPHA module:
DS803-ALPHA-1 Nov ‘09
©2008 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
Page 5
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