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Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Issue: 4, 01 November 2004
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
CONTROL44
4 bit Address - 4 bit Data encoder/decoder
CONTROL44 is a 4 bit address, 4 bit data encoder and decoder combined in a single IC. This device can operate in either Encode or Decode mode. It uses 1kbps differential Manchester bit balancing with preamble and checksum.CTR44 is specifically designed to be used in RF remote control applications. It is available in 20pin SSOP, 18pin SOIC and PDIP packages.
Figure 1: CONTROL44 in SO, DIL packages
Features
* * * * * * * * * * * * * * * * Operating voltage (temperature): 3.0V-5.5V for standard version (-40C to +125C) 2.0V-5.5V for low voltage version (-40C to +85C) Draws <2mA without external load 4 bit address and 4 bit data 16 different remotes with 4 controls each Single packetised transmission for fast activation Maximum usage of the range capability of an RF module Adequate preamble to settle data slicer in the receiver. Extra wake up preamble to allow for transmitter power up time requirements Differential Manchester encoding of address, data and checksum Synchronisation codes and checksum to reduce false triggering on noise Suitable to be used with Narrow Band FM radio modules Ceramic resonator or crystal oscillator up to 20MHz Data rate up to 5.6kbps Minimum external component requirement 4 wire, push button and latched push button modes Custom address, data bit variations available subject to minimum order quantity
Applications
* * * * * * * * Security and Alarm systems Emergency assistance call system Status reporting and monitoring systems RF Remote control systems Industrial controls HVAC controls Simple On/Off switching Long range telecontrol with Narrow Band FM radios
Radiometrix Ltd
CONTROL44
page 1
Encoder Mode
CONTROL44 can be put into Encoder Mode by connecting Mode (pin 2) to supply.
5V supply RF Vcc GND TXD Transmitter
10k
4k7
NC 1 Mode(Vdd) 2 TXE 3 RST 4 VSS 5 A0 6 A1 7 A2 8 A3 9 18 17 16 15 14 13 12 11 10 TXD SEND OSC1 OSC2 Vdd (+5V) DB3 DB2 DB1 DB0
NC Mode TXE RST VSS A0 A1 A2 A3
TXD SEND OSC1 OSC2 Vdd DB3 DB2 DB1 DB0
3.58MHz
10k 100nF
CONTROL44
Figure 2: CONTROL44 in Encoder Mode
Pin 1 2 3 4 5 6-9 10-13 14 15 16 17 18 Name NC Mode TXE RST VSS A3:A0 DB3:DB0 Vdd OSC2 OSC1 SEND TXD Input/Output Input Output Input Supply Input Input Supply Output Input Input Output Description RX=0V, TX=Vdd (no pull-up, only read at reset/power up) Active Low RF Transmitter Enable (Open drain, require 10k pull-up)4,6 Active Low Reset (Connect to user system reset or tie to Vdd) Supply Ground Least significant 4 bits of Address (Internal pull-ups to Vdd)1,5 Least significant 4 bits of Data B (Internal pull-ups to Vdd)5 4.5-5.5V supply (decouple with 0.1F close to IC) 3.58MHz resonator2 3.58MHz resonator2 Active Low Send Packet (Encoder Enable)3 Encoded Address and Data to TXD input of RF Transmitter
CONTROL44
Decoder Mode
CONTROL44 can be put into Decoder Mode by connecting Mode (pin 2) to Ground.
RF Receiver Vcc GND RXD 5V supply
STB Mode NC RST VSS A0 A1 A2 A3
RXD Latch OSC1 OSC2 Vdd DB3 DB2 DB1 DB0
STB Mode NC RST VSS A0 A1 A2 A3
RXD Latch OSC1 OSC2 Vdd DB3 DB2 DB1 DB0
10k
470R 3.58MHz
CONTROL44
Figure 3: CONTROL44 in Decoder Mode
CONTROL44
100nF
470R 470R 470R 470R
Radiometrix Ltd
CONTROL44
page 2
Pin 1 2 3 4 5 6-9 10-13 14 15 16 17 18
Name STB Mode NC RST VSS A3:A0 DA3:DA0 Vdd OSC2 OSC1 Latch RXD
Input/Output Output Input Input Supply Input Output Supply Output Input Input Input
Description Positive going pulse on reception of valid data packet. 10s duration RX=0V, TX=Vdd (no pull-up, only read at reset/power up) Active Low Reset (Connect to user system reset or tie to Vdd) Supply Ground Least significant 4 bits of Address (Internal pull-ups to Vdd)1,5 Least significant 4 bits of Data A5 4.5-5.5V supply (decouple with 0.1F close to IC) 3.58MHz resonator2 3.58MHz resonator2 0V = latch DA3:D0 until next packet Vdd = clear DA3:DA0 after 150ms (no pull-up) Encoded Address and Data from RXD Output of RF Receiver
Notes: 1. Only 4 of the 6 address bits are accessible. A5,A4 are set to 0 in CTR44 2. OSC1,2 require a 3.58MHz ceramic resonator with internal capacitors like Murata CSTLA3M58G55-B0. If a 2 pin resonator or crystal is used, then two 15pF-22pF caps are needed: one from OSC1 to 0V another from OSC2 to 0V. 100 series resistor between OSC2 and crystal may be required when driving low frequency crystal with High Speed (H) CTR44H version. 3. If a low going pulse of between 10s and 50ms is applied to SEND pin then a single packet will be transmitted 4. After asserting TXE low (active), the encoder allows 55ms for NBFM TX to power up and settle 5. Absolute maximum source/sink current from each DB3:DB0 pin is 25mA 6. TXE is an open drain output (no pull-up). Connect it to Vdd via a 10k pull-up resistor 7. MODE pin is only read at reset/power up. Connect to either Vdd (Encoder) or 0V (Decoder). 8. Without external loads the CTR44 draws <2mA from 5V supply. 9. Standard version can be used down to 3V for <10MHz oscillator. Low voltage version can be used down to 2V for <4MHz oscillator. 10. High Speed, CTR44H, version should not be used with Narrow Band FM radio modules.
Encoded Data Packet Format
Transmission format is 1kbps differential Manchester encoding when using 3.58MHz resonator. Oscillator frequency can decreased to suit narrow band RF module data rate requirements. CTR44H IC running at 20MHz can be used with wideband radio modules for fast data transmission.
0
0
0
1
0
1
0
1
1
1ms
500s
Figure 4: 1kbps differential Manchester coding of `1' and `0'
Radiometrix Ltd
CONTROL44
page 3
CONTROL44 transmits a 6-byte burst, with 8 bits of preamble and 4 bits postamble. When firing up the transmitter from cold CONTROL44 puts in an extra 55ms especially for Narrow Band FM transmitter and receiver requiring longer power-up to stable data time.
Figure 5: Push button transmission with 55ms power-up preamble The large amount of sync code, address and checksum reduce the likelihood of false calling on noise to an insignificant degree, while the breaking up of the data sequences with bit7 zeros is to reduce the likelihood of the decoder mistaking particular sequences in the data for sync codes. Differential Manchester encoding coverts the 0000 into 11001100 which is the bit pattern equivalent to preamble required to settle adaptive data slicer in the RF receiver module. Preamble = Sync1 = Sync2 = DataA = DataB = Address = Checksum = 11001100 this byte is not decoded. 10111111 111100(A7)(B7) 0(DA6-DA0) Reserved for future use and custom variants 0(DB6-DB0) 0(A5-A0)0 sum of (DA7-DA0) + (DB7-DB0) + Adr(whole byte) truncated to 8 bits
This allows 6 bits of address and 2 data bytes per 60ms burst when 3.58MHz resonator is used.
Preamble 00000000000000 11001100 Sync1 10111111 Sync2 111100(DA7)(DB7) Data A 0(DA6:DA0) Data B 0(DB6:DB0) Address 0(A5:A0)0 Check Sum DA7:DA0+DB7:DB0 +A7:A0 Postamble 0000
Figure 6: CONTROL44 data packet In the following example, CONTROL44 in Encoder mode is set with the following. DB3 1 DB2 0 DB1 1 DB0 0 A3 1 A2 0 A1 0 A0 1
The CONTROL44 will packetise the address and data into the following format. Reserved DataA is transmitted as 00hex. Any custom variants requiring more than 8 bits of data will make use of this slot.. Preamble 11001100
Radiometrix Ltd
Sync1 10111111
Sync2 11110000
DataA 00000000
DataB 00001010
Address 00010010
Checksum 00011100
Postamble 0000
page 4
CONTROL44
Figure 7: Synchronisation codes, DataA, DataB, Address, Checksum and Postamble
Application Modes
Mode 4 wires Pushbutton Latched Pushbutton Setup Latch = 0V (connect) SEND = 0V (connect) Latch = Vdd (connect) SEND =0V (push button) Latch = 0V (connect) SEND = 0V (push button) Description Continuous transmission like wire connection Decoder outputs active only when transmitter is keyed Decoder outputs hold state of last transmission
Ordering Information
CTR44-000-SS CTR44-000-SO CTR44-000-DIL CTR44L-000-SS CTR44L-000-SO CTR44L-000-DIL CTR44H-000-SS CTR44H-000-SO CTR44H-000-DIL Control 44 (4MHz)- No Frequency - Shrink Small Outline Control 44 (4MHz)- No Frequency - Small Outline Control 44 (4MHz)- No Frequency - Plastic Dual In Package Control 44 Low Voltage (4MHz) - No Frequency - Shrink Small Outline Control 44 Low Voltage (4MHz) - No Frequency - Small Outline Control 44 Low Voltage (4MHz) - No Frequency - Plastic Dual In Package Control 44 High Speed (4MHz-20MHz) - No Frequency - Shrink Small Outline Control 44 High Speed (4MHz-20MHz) - No Frequency - Small Outline Control 44 High Speed (4MHz-20MHz) - No Frequency - Plastic Dual In Package
Radiometrix Ltd
CONTROL44
page 5
Appendix
Figure 8: Relay circuit using CONTROL44 It uses Schrack RY610012 or OKO K4M12 relay which is rated 8A @ 250V AC or 30V DC and runs off at 12VDC. CONTROL44 Evaluation Kit is also available to evaluate CTR44 with single frequency Radiometrix radio modules.
Radiometrix Ltd
CONTROL44
page 6
Radiometrix Ltd
Hartcran House 231 Kenton Lane Harrow, Middlesex HA3 8RP ENGLAND Tel: +44 (0) 20 8909 9595 Fax: +44 (0) 20 8909 2233 sales@radiometrix.com www.radiometrix.com Copyright notice
This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in whole or in part must give clear acknowledgement to the copyright owner.
Limitation of liability
The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the right to make changes or improvements in the design, specification or manufacture of its subassembly products without notice. Radiometrix Ltd does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. This data sheet neither states nor implies warranty of any kind, including fitness for any particular application. These radio devices may be subject to radio interference and may not function as intended if interference is present. We do NOT recommend their use for life critical applications. The Intrastat commodity code for all our modules is: 8542 6000
R&TTE Directive
After 7 April 2001 the manufacturer can only place finished product on the market under the provisions of the R&TTE Directive. Equipment within the scope of the R&TTE Directive may demonstrate compliance to the essential requirements specified in Article 3 of the Directive, as appropriate to the particular equipment. Further details are available on The Office of Communications (Ofcom) web site: http://www.ofcom.org.uk/licensing_numbering/radiocomms/licensing/licensing_policy_manual/ Information Requests Ofcom Riverside House 2a Southwark Bridge Road London SE1 9HA Tel: +44 (0)845 456 3000 or 020 7981 3040 Fax: +44 (0)20 7783 4033 information.requests@ofcom.org.uk European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 ero@ero.dk www.ero.dk

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