Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com LMT3 Issue 1, 22 January 2013 NBFM Multi-channel transmitter for 868MHz SRD band The LMT3 is a 25kHz channel narrowband multichannel transmitter offering up to 25mW RF power. LMT3 can be paired with the Category 1 compliant receiver intended for European 869.2869.25MHz Social Alarm application. It can also be used for any 868 - 870MHz band Non-Specific SRD applications. The module offers a low power, reliable data link in an industry-standard pin out and footprint. Figure 1: LMT3 transmitter Features Conforms to EN 300 220-3 and EN 301 489-3 PLL synthesizer with TCXO Data rates up to 5 kbps for standard module Usable range over 500m @ 25mW Fully screened, Low profile Low power requirements Applications Social Alarm Handheld terminals EPOS equipment, barcode scanners Data loggers Industrial telemetry and telecommand In-building environmental monitoring and control High-end security and fire alarms DGPS systems Vehicle data up/download Heavy vehicle/machinery controls Technical Summary Social Alarm frequencies: CH0: 869.2125MHz, CH1: 869.2375MHz Custom frequency within 865MHz - 870MHz 32 channels Transmit power: +10dBm (10mW) / +14dBm (25mW) Supply range: 3.1 – 15V (TX @ 10mW), 4.1 – 15V (TX @ 25mW) Current consumption: 34mA @ 10mW, 68mA @ 25mW Data bit rate: 5kbps max. (standard module) Serial configuration by inverted RS232 at 3V CMOS level Evaluation platforms: NBEK + LM Series carrier Matching receiver: COR3-869-5 Radiometrix Ltd LMT3 Data Sheet page 1 Figure 2: LMT3 block diagram Radiometrix Ltd LMT3 Data Sheet page 2 Figure 3: LMT3 footprint (top view) Pin description – LMT3 Pin 1a Name Vcc 2a 3a 4a 5a 0V TXE TXD No pin 1b P0/PGM 2b 3b 4b 5b P1 P2 P3 No pin Function 3.1 – 15V power supply (@ 10mW) 4.1 – 15V power supply (@ 25mW) Ground Transmit Enable (active low) DC coupled input for 3V CMOS logic. Rin=47kΩ Not present in LMT3 Parallel Channel select LSB 1 Serial frequency programming / configuration Parallel Channel select Parallel Channel select Parallel Channel select MSB Not present in LMT3 Notes: 1. Serial programming is by an inverted, CMOS logic level, 2400 baud RS232 datastream applied to the P0 pin. 2. Channel select inputs have pullups (50kΩ) to 3v internal rail. Do not exceed 3V logic levels on this port. 3. Channel select inputs are active low 4. TXE has a 100kΩ pullup to Vcc 5. All pins are on an 0.1" grid 6. The pins 5a/b are not present, but are included in footprint for compatibility with other units in this family 7. In the 'off' state a PIN switch open circuits the RF output pin. There are no 'off' state spuri. 8. 10mW unit will operate (with marginally reduced specifications and lower (6-8mW) output power) from a 3.0V rail. This must be well regulated and without noise or ripple, as in this state the unit's internal regulator no longer operates, and provides no supply rejection. Radiometrix Ltd LMT3 Data Sheet page 3 Serial interface commands 2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits. Serial data is sent to the unit on one of the parallel channel select pins (P0). It is very important that the unit does not 'decode' switch bounce in ordinary operation as a command string, or spurious re-writing of the e2prom will result. For this reason the user must send the 16 character string ENABLESERIALMODE (followed by a carriage return) to activate the serial command mode before sending any of the command strings listed below. Command mode is disabled on power down, or on reception of a # character. To successfully program the unit, it must be enabled (TXE low). GOCHAN aa LOAD aa nnnnn SETPAR SETSER RVALUE rrrr SINGLE nnnnn Serially select channel aa, where aa is ch0 to ch31 Set value of N register for channel aa, where aa is Channels 0 to 31 Channel selected by 4 bit parallel inputs (ch0 to ch15 only) Channel selected by most recent GOCHAN operation Set value for R register Set value of N for single channel operation. N value NOT stored in EEPROM Process entry Clear all buffers Disable command mode <cr> / # aa = a two digit channel number from 00 to 31 nnnnn = synthesizer N register value (up to 65535) rrrr = synthesizer R register value (up to 16383) N TX = f RF f Channelspacing Note: Radiometrix Ltd = 869.200 MHz = 34768 25kHz R= f TCXO f channelspacing = 13MHz , So R=520 25kHz A pause of at least 50ms must be allowed between command strings (EEPROM programming time). SINGLE mode does not store the N value in EEPROM. Therefore the unit is inoperative after a power down until either another valid SINGLE command is received, or mode is changed by a GOCHAN, SETPAR or SETSER command. SINGLE mode is intended for frequency agile applications. If an N value greater than 65535 is needed then an offset of +65536 can be selected by setting bit 15 of the R value high (the N value is then reduced by 65536 of course)" Example: Fout = 869.2125 Fcomp = 12.5KHz N = 69537 This exceeds 65535, so: Bit 15 of R is set : RVALUE 33808 65536 is subtracted: LOAD00 4001 LMT3 Data Sheet page 4 Condensed specifications Frequency Social Alarm (SAL) variant: CH0: 869.2125MHz, CH1: 869.2375MHz User customisable frequencies: 865MHz – 870MHz ±1.5kHz 25kHz 16 channels controlled by parallel port or 32 via RS232 interface Frequency stability Channel spacing Number of channels Operating temperature Spurious radiations -10 ºC to +60 ºC (Storage -30 ºC to +70 ºC) Compliant with ETSI EN 300 220-3 and EN 301 489-3 Transmitter Output power +10dBm (10mW) ±1dB +14dBm (25mW) ±1dB ±3kHz 30ms from TXE transition FSK (F3D) DC – 5kHz (3V CMOS compatible) <-37dBm <-45dBm (no RF output in Standby) Peak deviation TX on switching time Modulation type TX modulation bandwidth Adjacent channel TX power TX spurious Supply Voltage Current Inputs Size Interface User RF Recommended PCB hole size 3.1V – 15V (10mW) 4.1 – 15V (25mW) 34mA @ 10mW (nominal) 68mA @ 25mW (nominal) <5µA standby (TXE high or floating) data (CMOS/TTL compatible) 33 x 23 x 9mm 10 (8) pin 0.1" pitch dual row (5+5) header 2pin 0.1” pitch 1.2mm Ordering Information: Part No. LMT3-869.2125-5 LMT3-869-5-SAL LMT3-869-5 LMT3-869-5-25mW Frequency (MHz) 869.2125 869.200 - 869.250 868 - 870 868 - 870 RF power (mW) 10 10 10 25 Channel spacing (kHz) 25 25 25 25 Data rate (kbps) 5 5 5 5 Matching COR3 receiver Part Number COR3-869.2125-5-H Frequency 869.2125MHz COR3-869-5-SAL 869.2-869.25MHz COR3-869-5-SAL-H 869.2-869.25MHz COR3-869-5 868-870MHz Radiometrix Ltd Module mounting Horizontal Mounting, Perpendicular pins Vertical Mounting, Parallel pins Horizontal Mounting, Perpendicular pins Vertical Mounting, Parallel pins LMT3 Data Sheet Pins RF, RFGND, RSSI, GND, VCC, AF, RXD RF, RFGND, RSSI, GND, VCC, AF, RXD P0/PGM RF, RFGND, RSSI, GND, VCC, AF, RXD P0/PGM RF, RFGND, RSSI, GND, VCC, AF, RXD P3, P2, P1, P0/PGM page 5 LMT3 Data Sheet 10 100 500 868.0 600kHz 25mW <1% or LBT Duty Cycle [mW] No Spacing Non-specific SRD Channel Spacing RF POWER [ERP] Radiometrix Ltd Applications 868.60 100kHz 868.70 10mW <1% 25kHz or WB Alarm 500kHz 25mW <0.1% or LBT No Spacing Non-specific SRD <1% 25kHz 869.25 250kHz 500mW 869.65 869.70 50kHz 25mW <10% or LBT <10% 869.30 869.40 50kHz 50kHz 100kHz 869.20 No Spacing 25kHz 25kHz or Wide Band 300kHz 5mW 870.0 up to 100% Non-specific SRD Alarm Non-specific SRD 10mW 10mW 10mW <0.1% 25kHz Social Alarm Alarm CEPT/ERC Rec 70-03, 868 MHz Band Plan [MHz] Appendix 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 [email protected] 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/radiocomms/ifi/ 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 [email protected] European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 [email protected] www.ero.dk