RAKwireless Technology RAK831 LoRa WAN Gateway User Manual

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RAK831 Datasheet
RAK831 Lora Gateway
Datasheet V1.2
© 2016 Rakwireless all rights reserved .
Mentioned in this document , the actual company and product
names, trademarks are their respective owners.
After update the new version, this document without prior
notice.
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SHENZHEN RAKWIRELESS TECHNOLOGY CO., LTD
RAK831 Datasheet
Content
1. Introduction ................................................................................................................ 3
1.1 Key Features ........................................................................................................................................... 4
1.2 Applications ............................................................................................................................................ 4
2. Module Package ......................................................................................................... 5
2.1 Pinout Description .................................................................................................................................. 5
2.2 Module Dimensions................................................................................................................................ 6
3. Module Overview ...................................................................................................... 7
3.1 SX1301 ................................................................................................................................................... 7
3.1.1 Block Diagram ...................................................................................................................................... 8
3.1.2 IF8 LORA channel ............................................................................................................................... 8
3.1.3 IF0 to IF7 LORA channels ................................................................................................................... 9
3.3 External Module Connector.................................................................................................................... 9
3.3.1 SPI ........................................................................................................................................................ 9
3.3.2 GPS PPS ............................................................................................................................................... 9
3.3.3 Digital IOs ............................................................................................................................................ 9
4. LoRa Systems, Network Approach .......................................................................... 10
4.1 Overview .............................................................................................................................................. 10
4.2 Firmware............................................................................................................................................... 11
5. Electrical Characteristics& Timing specifications ................................................... 11
5.1 Absolute Maximum Ratings ................................................................................................................. 11
5.2 Global Electrical Characteristics .......................................................................................................... 11
5.3 SPI Interface Characteristics................................................................................................................. 12
5.4 RF Characteristics................................................................................................................................. 12
5.4.1 Transmitter RF Characteristics ........................................................................................................... 12
5.4.2 Receiver RF Characteristics................................................................................................................ 13
5.5. RF Key Components ....................................................................................................................... 13
5.6. RF antenna interface ....................................................................................................................... 14
6. Contact information ................................................................................................. 15
7. Appendix .................................................................................................................. 15
8. Change Note............................................................................................................. 16
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RAK831 Datasheet
1. Introduction
The concentrator module RAK831 is targeted for a huge variety of applications like Smart
Metering, IoT and M2M applications. It is a multi- channel high performance Transmitter/receiver
module designed to receive several LoRa packets simultaneously using different spreading factors
on multiple channels. The concentrator module RAK831 can be integrated into a gateway as a
complete RF front end of this gateway. It provides the possibility to enable robust communication
between a LoRa gateway and a huge amount of LoRa end-nodes spread over a wide range of
distance. The RAK831 needs a host system for proper operation.
This is a ideal modular products to help you realize the whole Lora system development. With
the USB-SPI converter module FT2232, you can quickly to make the software development in your
PC. But also, you can integrate the concentrator module to your production product to realize the
Lora gateway function. This is very economic way to address for a huge variety of applications like
Smart Grid, Intelligent Farm, intelligent Farm and Other IoT applications.
The RAK831 needs a host system like Raspberry Pi or WisAP (OpenWRT based) or WisCam
for proper operation . The host processor can be a PC or MCU that will be connected to RAK831 via
USB or SPI
RAK831 is using as a gateway, communication based on lorawan protocol requires. 64
channels utilizing LoRa 125 kHz BW, starting at 902.3 MHz and incrementing linearly by 200 kHz to
914.9 MHz, and 8 channels utilizing LoRa 500 kHz BW, starting at 903.0 MHz and incrementing
linearly by 1.6 MHz to 914.2 MHz were used for receiving. 8 channels utilizing LoRa 500 kHz BW,
starting at 923.3 MHz and incrementing linearly by 600 kHz to 927.5 MHz were used for transmitting.
RAK831 is able to receive up to 8 LoRa packets simultaneously sent with different spreading
factors on different channels. This unique capability allows to implement innovative network
architectures advantageous over other short range systems:
End-point nodes (e.g. sensor nodes) can change frequency with each transmission in a random
pattern. This provides vast improvement of the system robustness in terms of interferer immunity
and radio channel diversity.
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RAK831 Datasheet
1.1 Key Features
- Compact size 80.0 x 50.0 x 5.0mm
- LoRaTM modulation technology
- Frequency band 923.3-927.5MHz
- Orthogonal spreading factors
- Sensitivity down to -142.5 dBm
- Maximum link budget162 dB
- SPI interface
- SX1301 base band processor
- Emulates 49 x LoRa demodulators
- 12 parallel demodulation paths
- 2 x SX1257 Tx/Rx front-ends High frequence
- 2 x SX1255 Tx/Rx front-ends low frequence
- Supply voltage 5 V
- RF interface optimized to 50
- Output power level up to 11 dBm
- GPS receiver (optional)
- Range up to 15 km (Line of Sight)
- Range of several km in urban environment
- Status LEDs
- HAL is available from
https://github.com/RAKWireless/RAK831_LoRaGateway
1.2 Applications
- Smart Metering
- Wireless Star Networks
-.Home-,Building-,Industrial automation
- Remote Control
- Wireless Sensors
- M2M, IoT
- Wireless Alarm and Security Systems
-…
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RAK831 Datasheet
2.Module Package
In the following the RAK831 module package is described. This description includes the
RAK831 pinout as well as the modules dimensions.
2.1 Pinout Description
The RAK831 provides headers at the bottom side, which have a pitch of 2.54 mm. The
description of the pins is given by belowTable .
Pin
Name
Type
Description
+5V
POWER
+5V Supply Voltage
GND
GND
GND
LNA_EN_A
Input
SX1301 Radio C Sample Valid
GND
GND
GPS Module LDO:Enable Pin
GND
GND
GND
RADIO_EN_A
Input
SX1257_A_EN
PA_G8
Input
PA GAIN 0
RADIO_EN_B
Input
SX1257_B_EN
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RAK831 Datasheet
10
PA_G16
Input
PA GAIN 1
11
PA_EN_A
Input
PA EN
12
GND
GND
GND
13
RADIO_RST
RST
SX1257_A_B RESET
14
GND
GND
GND
15
CSN
SPI
SX1301 SPI_NSS
16
MOSI
SPI
SX1301 SPI_MOSI
17
MISO
SPI
SX1301 SPI_MISO
18
SCK
SPI
SX1301 SPI_CLK
19
RESET
RST
SX1301 RESET
20
GPIO0
GPIO
SX1301 GPIO
21
GPIO1
GPIO
SX1301 GPIO
22
GPIO2
GPIO
SX1301 GPIO
23
GPIO3
GPIO
SX1301 GPIO
24
GPIO4
GPIO
SX1301 GPIO
2.2 Module Dimensions
The outer dimensions of the RAK831 are given by 80.0 x 50.0 mm ± 0.2 mm. The RAK831
provide four drills for screwing the PCB to another unit each with a drill diameter of 3 mm.
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RAK831 Datasheet
3.Module Overview
The Concentrator Module is currently available in one versions with SPI interface.
3.1 SX1301
The RAK831 includes Semtech’s SX1301 which is a digital baseband chip including a massive
digital signal processing engine specifically designed to offer breakthrough gateway capabilities in
the ISM bands worldwide. It integrates the LoRa concentrator IP.
The SX1301 is a smart baseband processor for long range ISM communication. In the receiver
part, it receives I and Q digitized bit stream for one or two receivers (SX1257), demodulates these
signals using several demodulators, adapting the demodulators settings to the received signal and
stores the received demodulated packets in a FIFO to be retrieved from a host system (PC, MCU).
In the transmitter part, the packets are modulated using a programmable LoRa modulator and sent
to one transmitter (SX1257). Received packets can be time-stamped using a GPS PPS input.
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RAK831 Datasheet
The SX1301 has an internal control block that receives microcode from the host system (PC,
MCU). The microcode is provided by Semtech as a binary file to load into the SX1301 at power-on
(see Semtech application support for more information).
The control of the SX1301 by the host system (PC, MCU) is made using a Hardware
Abstraction Layer (HAL). The Hardware Abstraction Layer source code is provided by Semtech and
can be adapted by the host system developers.
It is highly recommended to fully re-use the latest HAL as provided by Semtech on
https://github.com/Lora-net.
3.1.1 Block Diagram
The SX1301 digital baseband chip contains 10 programmable reception paths. Those paths
have differentiated levels of programmability and allow different use cases. It is important to
understand the differences between those demodulation paths to make the best possible use from
the system.
3.1.2 IF8 LORA channel
This channel is connected to one SX1257 using any arbitrary intermediate frequency within the
allowed range. This channel is LoRa only. The demodulation bandwidth can be configured to be 125,
250 or 500 kHz. The data rate can be configured to any of the LoRa available data rates (SF7 to
SF12) but, as opposed to IF0 to IF7, only the configured data rate will be demodulated. This
channel is intended to serve as a high speed backhaul link to other gateways or infrastructure
equipment. This demodulation path is compatible with the signal transmitted by the SX1272 and
SX1276 chip family.
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RAK831 Datasheet
3.1.3 IF0 to IF7 LORA channels
Those channels are connected to one SX1257. The channel bandwidth is 125 kHz and cannot
be modified or configured. Each channel IF frequency can be individually configured. On each of
those channels any data rate can be received without prior configuration.
Several packets using different data rates (different spreading factors) may be demodulated
simultaneously even on the same channel. Those channels are intended to be used for a massive
asynchronous star network of 10000’s of sensor nodes. Each sensor may use a random channel
(amongst IF0 to IF7) and a different data rate for any transmission.
Sensors located near the gateway will typically use the highest possible data rate in the fixed
125 kHz channel bandwidth (e.g. 6 kbit/s) while sensors located far away will use a lower data rate
down to 300 bit/s (minimum LoRa data rate in a 125 kHz channel).
The SX1301 digital baseband chip scans the 8 channels (IF0 to IF7) for preambles of all data
rates at all times.
The chip is able to demodulate simultaneously up to 8 packets. Any combination of spreading
factor and intermediate frequency for up to 8 packets is possible (e.g. one SF7 packet on IF0, one
SF12 packet on IF7 and one SF9 packet on IF1 simultaneously).
The SX1301 can detect simultaneously preambles corresponding to all data rates on all IF0 to
IF7 channels. However, it cannot demodulate more than 8 packets simultaneously. This is because
the SX1301 architecture separates the preamble detection and signal acquisition task from the
demodulation process. The number of simultaneously demodulated packets (in this case 8) is an
arbitrary system parameter and may be set to other values for a customer specific circuit.
The unique multi data-rate multi-channel demodulation capacity SF7 to SF12 and of channels
IF0 to IF7 allows innovative network architectures to be implemented.
3.3 External Module Connector
3.3.1 SPI
The connector on the bottom side provides an SPI connection, which allows direct access to
the Sx1301 SPI interface. This gives the target system the possibility to use existing SPI interfaces
to communicate.
After powering up RAK831 ,it is required to reset SX1301 via PIN 13. If the Hal driver from
Github is used this functionality is already implemented.
3.3.2 GPS PPS
In case of available PPS signals in the target system, it is possible to connect this available
signal to the appropriate pin at the connector.
3.3.3 Digital IOs
There are five GPIOs of the Sx1301 available, which gives the user some possibilities to get
information about the system status. Theses pins are the same, as they are used for the LEDs on
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RAK831 Datasheet
the RAK831 .
As default setting the LEDs :
1) Backhaul packet
2) TX packet
3) RX Sensor packet
5) RX buffer not empty
6) Power
4.LoRa Systems, Network Approach
The use of LoRa technology can be distinguished in “Public” and “Private” networks. In both
cases the usage of a concentrator module can be reasonable. Public networks are operator (e.g.
telecom) managed networks whereas private networks are individually managed networks.
LoRa networks are typically star or multiple star networks where a gateway relays the packets
between the end-nodes and a central network server. For private network approaches the server
can also be implemented on the gateway host.
Due to the possible high range the connection between end-nodes and the concentrator
RAK831 is always a direct link. There are no repeaters or routers within a LoRa network.
Depending on the used spreading factor and signal bandwidth different data rates1 (0.3 kbps to
~22 kbps) and sensitivities down to -142.5 dBm are possible. Spreading factor and signal bandwidth
are a trade-off between data rate and communication range.
4.1 Overview
The RAK831 is able to receive on different frequency channels at the same time and is able to
demodulate the LoRa signal without knowledge of the used spreading factor of the sending node.
RAK831
Due to the fact that the combination of spreading factors and signal bandwidths results in
different data rates the use of “Dynamic Data-Rate Adaption” becomes possible. That means that
LoRa nodes with high distances from the RAK831 must use higher spreading factors and therefore
have a lower data rate. LoRa nodes which are closer to the concentrator can use lower spreading
factors and therefore can increase their data rate.
Due to the fact that spreading factors are orthogonal and RAK831 supports up to 10
demodulations paths the channel capacity of a LoRa cell can be increased using RAK831 compared
to conventional modulation techniques.
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RAK831 Datasheet
4.2 Firmware
The LoRa MAC specification is currently driven by the companies Semtech, IBM and Actility.
Currently all available software, firmware and documentation can be found and downloaded from
the open source project LoRa-net hosted on https://github.com/Lora-net
This project considers all parts that are needed to run a network based on LoRa technology. It
includes the node firmware (several hardware platforms are supported), the gateway host software
(HAL driver for SX1301, packet forwarder) and a server implementation.
It is highly recommended to fully re-use the latest HAL as provided by Semtech.
5. Electrical Characteristics& Timing
specifications
In the following different electrical characteristics of the RAK831 are listed. Furthermore details
and other parameter ranges are available on request.
Note: Stress exceeding of one or more of the limiting values listed under “Absolute Maximum
Ratings” may cause permanent damage to the radio module.
5.1 Absolute Maximum Ratings
Parameter
Condition
Min
Typ.
Max
Unit
Supply Voltage(VDD)
-0.3
5.0
5.5
Operating Temperature
-40
+85
℃
-15
dBm
RF Iuput Power
Note:
Note: With RF output power level above +15 dBm a minimum distance to a transmitter should be 1 m
for avoiding too large input level.
5.2 Global Electrical Characteristics
Parameter
Condition
Min
Typ.
Max
Unit
4.8
5.0
5.2
Supply Voltage(VDD)
RX Current
100
TX Current
80
Current Consumption
mA
Note:
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RAK831 Datasheet
T=25℃,VDD=5V(Typ.) if nothing else stated
Parameter
Condition
Min
Logic low input threashold(VIL)
“0”logic input
Logic high input threashold(VIH)
“1”logic input
Logic low output level(VOL)
“0”logic output,2mA sink
Logic high output level(VOH)
“1”logic output,2mA source
Typ.
2.9
2.9
Max
Unit
0.4
3.3
0.4
3.3
Note:
5.3 SPI Interface Characteristics
T=25℃,VDD=5V(Typ.) if nothing else stated
Parameter
Condition
Min
Typ.
SCK frequency
Max
Unit
10
MHz
SCK high time
50
ns
SCK low time
50
ns
SCK rise time
ns
SCK fall time
ns
MOSI setup time
From MOSI change to SCK rising edge
10
ns
MOSI hold time
From SCK rising edge to MOSI change
20
ns
NSS setup time
From NSS falling edge to SCK rising edge
40
ns
NSS hold time
From SCK falling edge to NSS rising edge
40
ns
40
ns
NSS high time between
SPI accesses
Note:
5.4 RF Characteristics
5.4.1 Transmitter RF Characteristics
The RAK831 has an excellent transmitter performance. It is highly recommended, to use an
optimized configuration for the power level configuration, which is part of the HAL. This results in a
mean RF output power level and current consumption.
PA Control
DAC Control
MIX Control
DIG Gain
11
15
11
12
12
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Nominal RF Power
Level [dBm]
-5
-3
10
11
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RAK831 Datasheet
5.4.2 Receiver RF Characteristics
It is highly recommended, to use optimized RSSI calibration values, which is part of the HAL
v3.1. For both, Radio 1 and 2, the RSSI-Offset should be set -169.0.
5.5. RF Key Components
This section introduce the key components in RAK831 and help the developer to utilize the system
to realize own system level design.
1）LDO
The system power supply is provided by the external 5V DC power supply. SX1301 and related
clock crystal is powered by Dual output LDO transformer outputs 1.8V and 3.3V in order to meet the
normal working condition of SX1301. Other key components are powered by LDO transformer output
3.3V. To be aware of the system design of LDO's power supply enable is provided by the output GPIO
of SX1301 as default. The connection method of pin enable should be kept same as Semtech official
code. At the same time, System design also need to keep flexibility and all LDO enable should be
connect to pin DB24. For this case, user can run the official reference code in this board, and also can
change all external enable clock as they need for achieve the flexibility debugging.
2）Power amplifier
The Power amplifier choose RFMD LF Power Amplifier and built in two steps gain.
3）RF switch
The RF switch choose RFSW1012 which has advantage of high Isolation and low insertion loss.
This chip handling the switch between Tx and Rx. The Control logic as below image.Specially need
highlight that the pin of CTRL was controlled by SX1301’s GPIO through output signal of LNA_EN_A,
the Pin of EN was controlled by SX1301’s GPIO through output signal of RADIO_EN_A.
Simultaneously,it also can be controlled by external input signal through DB24.
13
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RAK831 Datasheet
5.6. RF antenna interface
RAK831 provide three types of RF interface like SMA and other two IPEX connector.See the
image as below for TDD_TXRX、TX_DEV、RX_DEV. Consider the developer may require to support
Tx/Rx simultaneously,therefore to make the compatible design. The Tx_DEV is the Tx channel, need
change the C224 to NC and C216 with CAP(56pf/0402) or 0ohm resistance when using as standalone
channel.RX_DEV is the Rx channel, need change C240 to NC and C244 with CAP(56pF/0402) or
0ohm resusrance. The default design select the Path to TDD_TXRX via RF switch and using external
antenna.
14
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RAK831 Datasheet
6. Contact information
Shenzhen
FAE mailbox: ken.yu@rakwireless.com
Tel : 0755-86108311
Fax: 0755-86152201
Address: Room 1007, Hangsheng Technology Building, South Four Road, Science and
Technology Park, Nanshan District, Shenzhen
7.Appendix
AFA
Adaptive Frequency Agility
BER
Bit Error Rate
BSC
Basic Spacing between Centers
GND
Ground
GPIO
General Purpose Input/Output
GPS
Global Positioning System
HAL
Hardware Abstraction Layer
IF
Intermediate Frequency
IoT
Internet of Things
ISM
Industrial, Scientific and Medical
LBT
Listen Before Talk
M2M
Machine to Machine
MAC
Medium Access Control
MCU
Microcontroller Unit
MPSSE
Multi-Protocol Synchronous Serial Engine (FTDI)
PCB
Printed Circuit Board
PPS
Pulse Per Second
RAM
Random Access Memory
RF
Radio Frequency
SMT
Surface Mounted Technology
SNR
Signal to Noise Ratio
SPI
Serial Peripheral Interface
TRX
Transceiver
USB
Universal Serial Bus
15
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RAK831 Datasheet
8.Change Note
Version
Date
Change
V1.0
2017-06-21
Draft
V1.1
2017-07-07
Modify picture
V1.2
2017-07-18
Modify the content
FCC Warning
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.
Any Changes or modifications not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.
When the module is installed in the host device, the FCC ID label must be visible through a
window on the final device or it must be visible when an access panel, door or cover is easily removed. If not, a second label must be placed on the outside of the final device that contains the
following text: ―Contains FCC ID: 2AF6B-RAK831.
Maximum antenna gain allowed for use with this device is 2 dBi.
This module complies with FCC radiation exposure limits set forth for an uncontrolled
environment .This equipment should be installed and operated with minimum distance 20 cm
between the radiator& your body.
16
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