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Radio Encoder / Decoder IC's
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16 I/O Telemetry Encoder/ Decoder Enables Easy Radio Control Connects directly to RF Modules Simple CMOS/TTL Data Interface Performs all Data Encryption for Reliable Operation. Achieves Maximum Range From RF Modules Fast Activation / Deactivation Time 16 I/O Line Channels Decoder Learns up to 30 Transmitters Easy Learn transmitter function Compatible with 200, 204 and 207 series transmitters Outputs follow inputs in Real Time. One to many / many to one relationship.
RF800
Hardware Features
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4.0 - 5.5V Operation. (2.0 - 5.5V optional) `Manchester' Modulation CRC Error Checking 28 pin DIP/SOIC Package 16 Digital I/O Telemetry Lines compatiblity with 200 series transmitters
Typical Applications
Remote Telemetry Alarm Systems Communications Systems High speed telemetry
Description
The RF800 is a single chip telemetry device, which may be an encoder or a decoder. When combined with a Radio transmitter / receiver it may be used to provide a remote control system with upto 16 I/O lines. The RF800 performs all the necessary data manipulation and encryption for a optimum range reliable radio link whilst providing a simple user interface. The device has been designed to obtain the maximum range from the Radio path using automatic data packet generation with `Manchester' encoding and CRC based error checking. The RF800 is compatible with the RF Solutions 200 series range of remote control products. An `integrated' remote control can be generated using any of the 200 hand held transmitters.
Part Number
RF800 RF800-SO
Description
RF800 Encoder decoder IC PDIP package RF800 Encoder decoder IC SMT package
Package
28pin PDIP 28pin SO
DS800-4 July '07
(c)2007 RF Solutions Ltd, www.rfsolutions.co.uk Tel 01273 898000 Fax 01273 480661
Page 1
Radio Encoder / Decoder IC's
RF800
System Operation: The RF800 is can be set to either encoder mode or decoder mode of operation. In all cases transmitters must be learnt to the RF800 decoder before any outputs will operate, thus enabling a secure telemetry system to be built with the possibility of several systems operating within a local environment. Achieving Optimum Range Range is dependant on many factors including: 1. RF Power output. 2. Receiver sensitivity. 3. Antenna efficiency. 4. Local environmental conditions and any local Interference. Given that there is a legal maximum power output which can be transmitted, and a limit on the sensitivity of the receiver (usually constrained by cost), and that the antenna can never achieve 0dB loss (100% efficiency), then the data type is an important aspect of the design. The RF800 devices use a fully balanced Manchester encoded data protocol designed for optimum use of the radio transmission path. This results in reduced bit errors and therefore ensures maximum range. The data format automatically includes a pre-amble, synchronisation header, followed by the encrypted and fixed code data then a CRC check. The RF800 data packet contains a total of 150 bits, which takes 30ms to transmit when the RF800 is set to 200us element time. Thus if the element time is set to 400us it takes a total of 60ms to transmit one data packet. Each RF800 is programmed at the time of manufacture with a unique 16-bit serial number, which provides a secure way of addressing RF800 devices. This provides upto 65,536 possible addresses.
Compatibility with 200 series Transmitters: Acting as a decoder the RF800 is compatible with the 200 series of ready to operate transmitter encoders (such as the 204 handset as shown right). To be compatible the RF800 must be setup as a decoder and have its element time set to 400us. This enables designers to easily integrate a remote control function into an application using a ready made transmitter.
DS800-4 July '07
(c)2007 RF Solutions Ltd, www.rfsolutions.co.uk Tel 01273 898000 Fax 01273 480661
Page 2
Radio Encoder / Decoder IC's
Pin Descriptions:
RF800
RF Baud Rate: The RF800 ICs are capable of being set to one of two RF data rates. The 100 / 400 Input allows selection of either 100 or 400 us element times on the RF serial data output. The input is read only at power up: a `1' sets 100 us and a `0' sets 400us. Please note that that the encoder and decoder must be set to the same element time. In order to operate an RF800 decoder with a 200 series transmitter the RF800 decoder must be set for 400us element time. Mode Pin: The RF800 device can be configured to act as either a decoder or an encoder. This selection is made using the mode pin. If the mode pin is held low the RF800 will act as a decoder and pin functions will be as the description for a decoder. If the mode pin is held high then the RF800 will act as an encoder IC and the pin functions will be as the description for the encoder. Oscillator: The RF800 device requires an external oscillator running at 4 MHz, please refer to the microchip datasheet for the 16F876A if more detailed information is required. TEN / LRN: This is a dual function pin. * When configured as a decoder: this pin acts as Learn pin, which enables the RF800 decoder to learn and record the address of compatible transmitters. * When configured as an encoder: this pin acts as a transmitter enable. This is used for controlling the switching of power to the radio transmitter. This is an active high output. TEN / 204: This is a dual function pin. * When configured as a decoder: this pin allows selection between momentary or latching mode when used with the 204 handheld transmitters. * When configured as an encoder: this pin acts as a transmitter enable. This can be for controlling the switching of power to the radio transmitter. This is an active low output. LED: This is a dual function pin. * When configured as a decoder: this pin acts as a learn LED drive output and gives indication of learn (and erase) progress. * When configured as an encoder: acts as an LED drive output and gives indication of radio data transmission.
DS800-4 July '07
(c)2007 RF Solutions Ltd, www.rfsolutions.co.uk Tel 01273 898000 Fax 01273 480661
Page 3
Radio Encoder / Decoder IC's
Typical application circuit for RF800 setup as a Decoder
RF800
Pin Descriptions for RF800 configured as a Decoder Pin Number 1 2 3 4 Name MCLR Mode 100 / 400 TEN / LRN Type Power In/Out In In/Out Description Vcc supply voltage connection Selects operation as Decoder when low or Encoder when high. RF baud rate (element time) select option. Logic `1' selects 100us element time. Logic `0' selects 400us element time. Learn button, puts RF800 Decoder into learn mode when momentarily connected to GND Sets outputs to either latched or monetary for operation with the 204 handheld transmitter. Logic "1" selects momentary mode Logic "0" selects latching mode Learn LED drive. Active low. Received RF serial data 0 volts. Connect to 4MHz, 3 terminal resonator. Connect to 4MHz, 3 terminal resonator. Logic outputs 9 to 16 (active low) Vcc supply voltage connection. Decouple with a 100n capacitor close to the IC supply pins. Logic outputs 1 to 8 (active low)
5 6 7 8 & 19 9 10 11-18 20 21-28
TEN / 204 LED Data GND OSC1 OSC2 Out 9-16 Vcc Out 1-8
In/Out Out In/Out Power In Out Out Power Out
DS800-4 July '07
(c)2007 RF Solutions Ltd, www.rfsolutions.co.uk Tel 01273 898000 Fax 01273 480661
Page 4
Radio Encoder / Decoder IC's
RF800
Learn Operation using momentary push switch (as application circuit for decoder) 1. Briefly press and release the learn switch. 2. The status LED will illuminate while the switch is pressed and remain on when released. 3. Operate the transmitter encoder once: status LED on the decoder will extinguish. 4. Operate the transmitter encoder a second time: status LED on the decoder will flash. 5. After the status LED has stopped flashing the encoder has been successfully taught to the decoder 6. This transmitter will now operate the system. Erase operation using momentary push switch (as application circuit) To completely erase all learned transmitters, press and hold the learn switch on the decoder for 10 seconds. The status LED will illuminate whilst the switch is held down and when it is released will flash while the decoder erases all memory. It may take several seconds until the erase function is complete. After the status LED is extinguished all the encoder identities are erased from the decoder's non-volatile EEPROM memory.
DS800-4 July '07
(c)2007 RF Solutions Ltd, www.rfsolutions.co.uk Tel 01273 898000 Fax 01273 480661
Page 5
Radio Encoder / Decoder IC's
Typical application circuit for RF800 setup as an Encoder
RF800
Pin Descriptions for RF800 configured as a Encoder Pin Number 1 2 3 4 5 6 7 8 & 19 9 10 11-18 20 28-21 Name MCLR Mode 100 / 400 TEN / LRN TEN / 204 LED Data GND OSC1 OSC2 IN 9-16 Vcc IN 1-8 Type Power In/Out In In/Out In/Out Out In/Out Power In Out In Power In Description Vcc supply voltage connection Selects operation as Decoder when low or Encoder when high. RF baud rate (element time) select option. Logic `1' selects 100us element time. Logic `0' selects 400us element time. Transmitter enable active low Transmitter enable active high Status LED Transmitted RF serial data 0 volts. Connect to 4MHz, 3 terminal resonator. Connect to 4MHz, 3 terminal resonator. Logic inputs 9 to 16 Vcc supply voltage connection. Decouple with a 100n capacitor close to the IC supply pins. Logic inputs 1 to 8
DS800-4 July '07
(c)2007 RF Solutions Ltd, www.rfsolutions.co.uk Tel 01273 898000 Fax 01273 480661
Page 6
Radio Encoder / Decoder IC's
Technical Specifications:
RF800
Absolute Maximum Ratings
Note: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
Item Supply voltage Input voltage Output voltage Max output current Storage temperature Lead soldering temp ESD rating Max O/P current sunk by any I/O pin Max O/P current sourced by any I/O pin
Rating 4 to 5.5 -0.3 to VDD + 0.3 -0.3 to VDD+ 0.3 25 -55 to +125 300 4000 25 25
Units V V V mA (Note) C (Note) C V mA mA
RF800 Decoder/ Encoder
Electrical Characteristics Operating current(average) Vdd = 5V Standby current High level Input voltage Low level input voltage High level output voltage Low level output voltage Output Pin Current rating LED sink current 5 Min Typical 1.8 1.8 .45 Vdd Vss Vdd-0.7 0.6 25 25 Max 3.3 3.3 Vdd .2Vss Unit mA A V V V V mA mA
RF800E / 800D System Characteristics
Electrical Characteristics Time from RF800E input operation to RF800D Output asserted: Element time of 100uSecs Element time of 400uSecs Time from RF800E input released to RF800D Output released: Element time of 100uSecs Element time of 400uSecs Decoder Momentary Output Time of operation Min Typical Max Unit mS
16.6 66.4
16.8 66.6
17 66.8
16.6 66.4 350
16.8 66.6
17 66.8
mS
mS
Note that in momentary mode, the output will be asserted for as long as the 204 buttons are pressed.
DS800-4 July '07
(c)2007 RF Solutions Ltd, www.rfsolutions.co.uk Tel 01273 898000 Fax 01273 480661
Page 7
Radio Encoder / Decoder IC's
RF800
DS800-4 July '07
(c)2007 RF Solutions Ltd, www.rfsolutions.co.uk Tel 01273 898000 Fax 01273 480661
Page 8
Radio Encoder / Decoder IC's
RF800
R. F. Solutions Ltd., Unit 21, Cliffe Industrial Estate, South Street, Lewes, E. Sussex, BN8 6JL, England Tel +44 (0)1273 898 000 Email sales@rfsolutions.co.uk Fax +44 (0)1273 480 661 http://www.rfsolutions.co.uk
RF Solutions is a member of the Low Power Radio Association All Trademarks acknowledged and remain the property of the respected owners
Information contained in this document is believed to be accurate, however no representation or warranty is given and R.F. Solutions Ltd. assumes no liability with respect to the accuracy of such information. Use of R.F.Solutions as critical components in life support systems is not authorised except with express written approval from R.F.Solutions Ltd.
DS800-4 July '07
(c)2007 RF Solutions Ltd, www.rfsolutions.co.uk Tel 01273 898000 Fax 01273 480661
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