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
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
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.
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
Name
GPIO
Busy
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
2
3
4
5
GPIO
SDO
SDI
Host Ready
6
7
8 - 22
23
24
Notes
Vcc
Gnd
NC
RF Gnd
RF
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
2
RF
19
18
2.54 mm
17
16
C/L
15
14
13
20.32 mm
3
4
5
6
7
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
8
9
10
11
12
1.2 mm
0.8 mm
12.90 mm
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)
Transmit supply current
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
RF Frequency
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
+7
+17
±10
-47
SF6
-122
-119
-116
2.4
+7
+20
< -36
500
SF12
-137
-134
-131
115.2
dBm
dBm
ppm
dBm
Kbps
dBm
dBm
dBm
Kbps
mS
mm
mm
grams
At 125kHz bandwidth (SF 6 - 12)
At 250kHz bandwidth
At 500kHz bandwidth
Host interface
2,3
868MHz - 50Ω load
915MHz - 50Ω load
Overall
Meets EN 300 220-3
Pin
6
6
6
Min
2.5
18
Typical
3.3-5.0
90
10
3.1
0.1
2.0
100
24
868
902
50
869.85
915
25
3.6
0.2
Max
5.5
125
11.2
Units
Volts
mA
mA
Volts
Volts
mA
Volts
Volts
KΩ
Ohms
MHz
MHz
Notes
90mA at +17dBm
125mA at +20dBm
2
10k load to +Vcc supply
10k load to +Vcc supply
1
870
928
See ER Configuration command
set
19.2
1
15 x 20 x 2.2
2.54
1.5
(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 (<20mV p-p total). It is suggested that
100nF ceramic capacitors be used to de-couple the supply close to the power pins of the transceiver. The use of ‘switch mode’
power supplies should generally be avoided as they can generate both conducted and radiated high frequency noise that can be very
difficult to eliminate. This noise may considerably reduce the performance of any radio device that is connected or adjacent to such
a supply.
Antennas
The eRIC transceiver can be used with the various common types of antenna that match the 50Ω RF Input/Output such as a
monopole (whip), a tuned helical antenna, a PCB loop antenna or a ceramic ‘chip’ antenna.
Monopole antennas are resonant with a length corresponding to one quarter of the electrical wavelength (Lambda/4). They are
very easy to implement and can simply be a ‘piece of wire’ or PCB track which at 434MHz should be 16.4cms in length. This should
be kept straight, in ‘free space’ and well away from all other circuitry, conducting objects and metalwork and should preferably be
connected directly to the Antenna pin (24) of the eRIC transceiver.
If the antenna needs to be remote it should be connected via a 50Ω coaxial feeder cable or transmission line. A 50Ω transmission
line can be constructed on FR4 board material by using a 3mm wide PCB track over a ground plane and this should be kept as
short as possible.
The eRIC transceiver is also fitted with UFL (U.FL) RF Connector wired in parallel with pin 23 (RF Gnd) and pin 24 (RF In/Out).
LPRS can supply suitable antennas fitted with matching connectors and low loss cable assemblies.
Helical antennas are also resonant and generally chosen for their more compact dimensions. They are more difficult to optimise
than monopole antennas and are critical with regard to any surrounding conducting objects that can easily ‘de-tune’ them. They
operate most efficiently when there is a substantial ground plane for them to radiate against.
PCB loop antennas are the most compact antennas but are less effective than the other types. They are also more difficult to design
and must be carefully ‘tuned’ for best performance.
Chip antennas are attractive as they are compact and if used in accordance with the manufacturer’s specifications can provide very
good performance.
The Internet can provide much useful information on the design of Short Range Device (SRD) Antennas.
Please Note: To meet US FCC requirements the modules must be used with the specified antennas (TBA) that were used for
testing.
eRic_LoRa_Datasheet_1v0.docx
Page 5 of 10
京公网安备 11010802033920号
EEWORLD
