LRCR1-1276H Wireless SPI Transmission Module V2.0 LRCR1-1276H Wireless SPI Transmission Module Version 2.0 LRCR1-1276H Wireless SPI Transmission Module V2.0 1. Product description SX1276 wireless SPI module is developed based on long distance and high capacity internet system solution by SEMTECH. Except the configuration technology of traditional GFSK module, the new SX127x use LORA long-distance spread spectrum technology. The module has high performance of transmission sensitivity and anti-interference. The module can easily embedded to existing product or system and get rid of wire transmission way. User needs to customize the communication protocols on existing micro-controller unit (MCU) to activate the bidirectional communication and realizing date transmission. 1.1 Product Appearance 1.2 Technical Parameter Type Index Name Wireless Module Modulation mode LoRaTM spread spectrum, FSK mode Frequency range 902-928MHz Transmitting power 16dBmEIRP) Transmission sensitivity
-143dBm RF Transmission speed Spread spectrum factor (SF) and bandwidth (BW) setting Transmission distance 3000-5000 Meter Antenna connection External SMA antenna, spring antenna, sucker FIFO Max 256 bytes LRCR1-1276H Wireless SPI Transmission Module V2.0 Low-voltage detection Voltage lower than threshold, voltage interrupts CAD detection Support wak-on-wireless Input voltage DC 3.3V Max emission current 120mA(20dBm) Max receiving current
<10mA Static Current
<1uA working temperature
-40~ 85 Power Consumpti on Work Environme nt 1.3 Appearance size chart Provide data interference of SPI wireless module for users convenient to install and use. The specific pin is as below:
LRCR1-1276H Wireless SPI Transmission Module V2.0 Left Side:
Identification Function Remark SDN Control RF switch High level for general transmission, low level for I/O Digital I/O Port Digital I/O Port Power static current GPIO I/O GPIO output I/O GPIO output I/O 3.3V(1.83.3V) Digital I/O Port GPIO output I/O Digital I/O Port GPIO output I/O Wire ground Wire output DIO1 DIO0 3.3V DIO4 DIO3 GND ANT Right Side:
Identification Function Remark GND MISO MOSI SCK NSS Power ground SPI data output GPIO output SPI data input SPI clock SPI slect GPIO input GPIO input GPIO input NRESTET Reset trigger GPIO output I/O Digital I/O port GPIO output I/O Power ground DIO5 GND 2. Hardware specific description 2.1 SPI bus NSS(SEL)SPI chip select MOSImaster output slave input MISOmaster input slave output SCKSPI clock 2.2 DIO0-DIO5 instruction LORA mode per below LRCR1-1276H Wireless SPI Transmission Module V2.0 FSK mode per below 2.3 Simple application specification Per LORA mode as example:
DIO0 use as instruction of transmitting and receiving, DIO4 use as instruction of lead code. DIO3 and DIO4 use for preventing wireless data collision. Remark The precondition of realizing communication between two modules are they have same frequency, spread spectrum factor and bandwidth. 3. Parameters 3.1 Carrier frequency To spread or carrier the frequency based on the frequency. Its a carrier signal if no digital transmitted. LRCR1-1276H Wireless SPI Transmission Module V2.0 3.2 Spreading spectrum factor (SF) Spreading factor is the basic component of CDMA (code division multiple access), chip speed = symbol rate SF, the use of SF ensure the wider selection of symbol rate in TD information channel and provide solid support for QOS. SF also determines the quantity of access to end. The size of SF determines the size of real digital data rate for user (remark, data refer to real digital data. take data 11111111 as example, user A use 11 to represent 1, his real data is 1111; user B use 1111 to represent 1, however his real data is 11. User B is less likely to make mistakes than user A, but user Bs data rate is less than user A.) Due the existing of orthocode, if we increased SF, the users real data decreased from control centers view. However, the available user numbers are (spreading code) increased and real data rate remain unchanged. 3.3 LORA LORA, in another way, is to modulate the signal under wider spectrum than basic. Below is the LORA figure of 125K and 250K (the broadband refer to purple line, signal modeling line refer to yellow line). The setting of LORA decided by crystal accuracy, our recommendation on Min ROLA is 125K. 125K ROLA 250K ROLA LRCR1-1276H Wireless SPI Transmission Module V2.0 4. Wire selection Antenna is the main part of communication system. The quality of antenna affect the communication index directly. It is important for a user to select the antenna. Generally therere two points on selecting antenna:
1 Antenna type: if the wave of antenna met system design requirement 2 Electric performance: if the broadband, transmission gain, impedance, rated power met system design. Generally the transmission gain is 50 stationary wave is less than 1.4. We provide multiple antenna solution for users to realizing best transmission result. 5. Fault description Here are the common problems with the module:
Fault Cause of fault Solution Complex environment, too many obstacles Use in external open air and put up high support for antenna Transmissi on distance short LRCR1-1276H Wireless SPI Transmission Module V2.0 Bad weather, like fog, rain, snow, dust etc. Avoiding bad weather or use high power module Antenna is not match leads to less gain Select right antenna and use high gain antenna Transmission rate over fast Lower the rate, including gorge line and air rate. The interference from similar frequency or strong magnetic or Switch channel to avoid interference power Incorrect connection Reconnect the line according to diagram Loose contact Reconnect the power, signal line and bound them Module match fault with level Use TTL/RS232/RS485 connection Module match fault with device parameter Reset parameter, baud rate, checksum etc. Communic ation fault Transmitting and receiving match fault Reset parameters, frequency, channel, air speed, etc. Data overload Divide transmission line or change higher performance module Module level chip broke Change chip RS232RS485 Main module damage Change new module User equipment damage Use wire to get test done and change to wireless module after Similar frequency interference Get away from the interference or change frequency Antenna system match fault Change antenna system error rate Too high LRCR1-1276H Wireless SPI Transmission Module V2.0 Setting fault of serial port and air baud rate Ensure device speed same with serial speed, and module with air baud rate Communication speed overload Try lower the speed, especially air baud Large power ripple Change to stable power Port line over length Change to better cable or shorter ones 6. Attention
(1) If the power supply within the required range, Special requirements to 3.3V power supply, the power supply voltage not exceed this voltage, Otherwise it will burnout the module
(2) This module is not waterproof, lighting protection, pay attention to waterproof and lighting protection
(3) Dont reverse connection the positive and negative of power supply, otherwise it will burnout module
(4) The module should be installed in prevent static interference environment, the antenna part is best not to contact with metal objects.
(5) When install the module, the antenna position shouldnt be too close to the MCU of the product to prevent interference.
(6) When power supply, Confirm the ground wire of the module is connected with ground wire of your product.
(7) In normal operation, please do not touch the module and antenna part, so as to achieve the best transmission effect. 7. Applications Wireless access control checks on work attendance Wireless Power measurement and control Petrochemical wireless measurement and control Wireless measurement and control of oil field Wireless computer room monitoring etc. LRCR1-1276H Wireless SPI Transmission Module V2.0 8. FCC Statement This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. NOTE: Any changes or modifications not expressly approved by the grantee of this device could void the user's authority to operate the equipment. RF exposure warning This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment must be installed and operated in accordance with provided instructions and the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter. Module statement The modules FCC ID is not visible when installed in the host, or If the host is marketed so that end users do not have straight forward commonly used methods for access to remove the module so that the FCC ID of the module is visible; then an additional permanent label referring to the enclosed module: Contains Transmitter Module FCC ID: 2AQXP-LCR1-1276H or Contains FCC ID: 2AQXP-LCR1-1276H must be used.