ERIC-LORA

easyRadio eRIC-LoRa Long Range Datasheet Features Chirped Spread Spectrum technology Pin compatible with eRIC series RF modules uFL RF connector for remote antennas Point to Point communication Half duplex transparent Serial Data Input and Output Up to 180 bytes per packet Familiar easyRadio commands Built in temperature sensor ‘Flash’ firmware upgrades. New features and updates can be quickly programmed using LPRS tools Key Parameters Product image for illustration Purposes only The easyRadio eRIC-LoRa (Long Range) RF transceiver module uses Chirped Spread Spectrum (CSS) modulation together with DSP (Digital Signal Processing) to achieve greater range than traditional devices using OOK, FSK or GFSK modulation. In addition, sensitivity and blocking performance are improved giving high interference immunity whilst still offering low power consumption. The module is a complete sub-system that combines a high performance low power RF transceiver, a microcontroller and a voltage regulator. Key operating parameters can be changed and configured by sending simple ‘text’ (ASCII character) commands to the module. Frequency: 868/915MHz Receiver sensitivity: down to -137dBm Multi-channel operation RF Power output: up to +20dBm (100mW) Receive current consumption: 15mA RSSI dynamic range: 127dB Line of Sight (LoS) range - 1km – 3km plus User Programmable Options: Spreading factors 6: to 12 Error correction rate Bandwidth: 125, 250, 500kHz Over air data rates of up to 300 kbps Host Data Rate: 2.4kbps – 115.2kbps The variable spreading factor and error correction rate allow the user to optimise the bandwidth to provide a balance between sensitivity (range) and data rate. Applications Required range is above 1km or transceiver is in poor RF location Suburban security alarms - void buildings, caravan or car storage sites, warehouses Rural security, farm buildings/equipment, livestock monitoring, remote irrigation pumps Data collection and monitoring over a wide area eRic_LoRa_Datasheet_1v0.docx Page 1 of 10 easyRadio Advanced eRIC-LoRa Long Range Datasheet eRIC-LoRa Transceiver The easyRadio eRIC-LoRa RF transceiver module is a complete sub-system that combines a high performance low power RF transceiver, a microcontroller and a voltage regulator. The Serial Data Input (SDI) and Serial Data Output (SDO) by default operate at the standard 19,200 Baud and two handshake lines provide optional flow control to and from the host. The easyRadio Transceiver can accept and transmit up to 180 bytes of data, which it buffers internally before transmitting in an efficient over-air code format. Any other eRIC-LoRa transceiver, within range and on the same settings, that ‘hears’ the transmission will decode the message and place the recovered data within a receive buffer that can then be downloaded to the receiving host for processing and interpretation. Radio transmission and reception is bi-directional (half duplex) i.e. transmit OR receive but not simultaneously. Extra internal buffers however, allow the user to upload data while a download is in progress giving the appearance of fully duplex data flow. Block Diagram Pin/Pad Description Pad No 1 2 2 3 4 5 6 7 8 - 22 23 24 Name GPIO Busy GPIO SDO SDI Host Ready Vcc Gnd NC RF Gnd RF Description General Purpose digital I/O Clear to Send (CTS) function Digital output General Purpose digital I/O Rx Serial Data Out (Default) Tx Serial Data In (Default) Request to Send (RTS) function Digital input Operating Supply Voltage Power Ground RF Ground – 0V 50R RF Input/Output Notes Indicates that transceiver is ready to receive serial data from the Host. Low – Transceiver Ready, High – Transceiver not Ready Optional A-D Input Digital output - Connect to Host serial input Digital input - Connect to Host serial output Used to indicate that Host is ready to receive serial data from the Transceiver Low – Host Ready, High – Host Not Ready Weak (35k) pull down enabled. Optional A-D Input +2.4V to +6V. Supply should be ‘clean’, noise and ripple free 0V Ground Not Connnected Connect to antenna ground and local ground plane. Internally connected to Power Ground 0V Connect to suitable antenna via 50R PCB trace or use the alternative UFL connector Notes GPIO Pins/pads are configured (by default) on power up or upon Reset as Inputs with internal weak pull downs. Therefore, exercise caution when connecting to any external circuitry. Pins/Pads 1-7 are physically (pin/pad sequence) and electrically compatible with easyRadio eRA400/900 Transceivers. Interrupt function available on Pins/pad 1, 2, 3, 4, 5, 22 eRic_LoRa_Datasheet_1v0.docx Page 2 of 10 easyRadio Advanced eRIC-LoRa Long Range Datasheet Mechanical 24 15.24 mm 23 22 21 20 1 19 2 RF 18 17 4 16 5 6 7 C/L eRIC 20.32 mm 2.54 mm 3 8 15 14 13 9 10 11 12 12.90 mm 1.2 mm 0.8 mm Figure 1 Mechanical Drawing PCB Layout Notes Pitch of the castellated connection pads is 2.54mm. Pads 4 & 16 and 10 & 22 are on centre line (C/L) of module It is recommended that the module is mounted on a double sided PCB and that the area below the module be flooded with additional copper ground plane. This should be connected to pad 23 (RF Ground) and pad 7 (Power Gnd). The recommended pad layout is shown below. Pads should be solid with no hole. eRIC is designed for reflow soldering. Please contact LPRS Technical Department for further details and the suggested thermal profiles. eRic_LoRa_Datasheet_1v0.docx Page 3 of 10 easyRadio Advanced eRIC-LoRa Long Range Datasheet Absolute Maximum Ratings Operating Temperature Range Storage Temperature Range Vcc All Other Pins (N.B.) Antenna -40° C to +85° C -40° C to +85° C - 0.3 to + 5.5 Volts - 0.3 to +3.3 Volts +10dBm - Should be protected to prevent damage from ESD Performance Data: eRIC-LoRa. Supply +5.0 Volt ± 5%, Temperature 20° C DC Parameters Supply Voltage (Vcc) Pin 6 Min 2.5 Typical 3.3-5.0 Max 5.5 Units Volts Transmit supply current 6 18 90 125 mA Receive supply current Interface Levels Data Output Logic 1 Data Output Logic 0 Logic Output Current Data Input Logic 1 Data Input Logic 0 Input Pull-ups RF Parameters Antenna Impedance 6 10 11.2 mA 3.1 0.1 25 3.6 0.2 2.0 100 24 868 902 RF Frequency 50 869.85 915 870 928 Volts Volts mA Volts Volts KΩ Notes 90mA at +17dBm 125mA at +20dBm 2 10k load to +Vcc supply 10k load to +Vcc supply 1 Ohms MHz MHz See ER Configuration command set Transmitter RF Power Output Frequency accuracy Harmonics/Spurious Emissions Over Air Data Rate Receiver Sensitivity Serial Data Rate Logic Timing Initial Power Up Time Mechanical Size Pin Pitch Weight 24 24 SF6 -122 -119 -116 2.4 +7 +17 ±10 +7 +20 dBm dBm ppm 868MHz - 50Ω load 915MHz - 50Ω load Overall -47 < -36 dBm Meets EN 300 220-3 Kbps 19.2 500 SF12 -137 -134 -131 115.2 1 15 x 20 x 2.2 2.54 1.5 dBm dBm dBm Kbps At 125kHz bandwidth (SF 6 - 12) At 250kHz bandwidth At 500kHz bandwidth Host interface mS 2,3 mm mm grams (Standard 0.1 Inches) Notes: 1. 2. 3. The ‘Host Ready Input’ and the ‘Serial Data Input’ have ‘weak’ internal pull-ups enabled. The transceiver will then be ready to receive (default) or transmit. It would normally be left in this powered state ready to receive data. During power up the Busy Output line goes high and then goes low when ready for use. eRic_LoRa_Datasheet_1v0.docx Page 4 of 10 easyRadio Advanced eRIC-LoRa Long Range Datasheet Checklist The module operates internally from an on board 3.3 Volt low drop regulator. The logic levels of the input/output pins are therefore between 0 Volt and 3.3 Volts. Outputs will drive logic operating at 3.3 Volts and inputs will be correctly driven by logic operating at 5 Volts. Fit 10K resistors in series with data lines when interfacing to 5V logic. The serial inputs and outputs are intended for connection to a UART or similar low voltage logic device. Do not connect any of the inputs or outputs directly to an RS232 port. The transceiver module may be permanently damaged by the voltages (+/- 12V) present on RS232 signal lines. When handshaking is enabled the ‘Host Ready Input’ should be held at 0 Volt (Ground) in the idle state. Notes When power is first applied to the module the processor retrieves ‘calibration’ data for the RF section that compensates for temperature and power supply voltage variations. The transceiver will then be ready to transmit or receive (default) and would normally be left in this state, ready to receive data. The internal Vreg is not brought out to a specific pin/pad. Should there be need to connect external pull up resistors then connection should be made to a spare GPIO pin/pad configured as a ‘High’ output. Power Supply The supply used to power the transceiver should be ‘clean’ and free from ripple and noise (