LoRa-E5 LoRa Wireless Module - Powered by STM32WE5 Datasheet V1.0 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com Content Content ................................................................................................................................................... 2 1 Introduction ...................................................................................................................................... - 3 -
1.1 Feature .......................................................................................................................................... 3 2 Description ........................................................................................................................................... 5 2.1 Pin definition .................................................................................................................................. 5 3 Electrical characteristics ......................................................................................................................... 6 3.1 Extreme working conditions ............................................................................................................. 6 3.2 Normal working conditions ............................................................................................................... 7 3.3 Module specifications ...................................................................................................................... 7 4 Typical RF performance test .................................................................................................................... 8 4.1 LoRa-E5-LF Performance Testing ....................................................................................................... 8 4.2 LoRa-E5-HF Performance Testing .................................................................................................... 11 5 Application information ........................................................................................................................ 14 5.1 Package information ...................................................................................................................... 14 5.2 External interface of the module ..................................................................................................... 15 5.3 Reference design based on LoRa-E5 module ..................................................................................... 15 6 LoRaWAN application information ........................................................................................................ 16 6.1 LoRaWAN application ................................................................................................................... 16 6.2 Design LoRaWAN wireless sensor based on LoRa-E5 ......................................................................... 16 7 Ordering information ........................................................................................................................... 17 8 Reversion ........................................................................................................................................... 17 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 1 Introduction LoRa-E5 is a low-cost, ultra-low power, ultra-small size LoRaWAN module designed by Seeed Technology Co., Ltd. The module uses ST system-level package chip STM32WLE5JC, embedded high-performance LoRa chip SX126X and ultra-low power Consumption of MCU. The target application of this module is wireless sensor networks and other Internet of Things devices, especially battery-powered low power consumption and long-
distance occasions. This specification mainly describes the hardware information, hardware performance and application information of the module. LoRa-E5 LoRaWAN module is mainly suitable for long-distance, ultra-low-power applications such as wireless meter reading, sensor networks, and other low-power wide-area IoT scenarios. 1.1 Feature Low power consumption: as low as 2.1uA sleep current (WOR mode) low cost:
Small size: 12mm X 12mm * 2.5mm 28 pins SMT High performance:
LoRa-E5-LF TXOP=10dBm@434MHz TXOP=22dBm@470MHz TXOP=22dBm@868/915MHz LoRa-E5-HF:
-136.5dBm sensitivity for SF12 with 125KHz BW 158dB link budget, suitable for long distance interface USART I2C ADC SWD Embedded LoRaWAN protocol, AT command, support global LoRaWAN frequency plan EU868 US915 and US915 Hybrid CN779 AU915 CN470 and CN470 Prequel AS923 KR920 IN865 This product specification includes a detailed description of the LoRa-E5 module's performance and functions. For the latest firmware, product updates or errata, please contact Seeedstudio. 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com - 3 - / 18 2 Description LoRa-E5 is embedded with high-performance STM32WLE5JC, which is very suitable for the design of various IoT nodes. Based on the development of the multi-mode high-performance SX126X chip, the LoRa-E5 module supports (G) FSK mode and LoRa. 62.5kHz, 125kHz, 250kHz and 500kHz bandwidth can be used in LoRa mode. Based on the powerful functions and rich peripherals of STM32WLE5JC, the module provides UART, I2C, SPI, ADC and GPIOs for users to choose according to the application. If you need to upgrade the built-in AT command firmware, please use the two-wire interface (UART) to complete the programming based on the boot mode; and customers can develop the software based on the internal MCU of the module to complete the program erasure and programming through SWD. LoRa-E5 currently contains two sub-models, LoRa-E5-LF (Single-core STM32WLE5JC + SX126X) and LoRa-E5-HF
(Single-core STM32WLE5JC + SX126X), LoRa-E5-LF supports 22dBm @ LF band (470MHz); 10dBm @ LF band
(434MHz); LoRa-E5-HF supports 22dBm @ HF band (868 / 915MHz). Figure 1 LoRa-E5 Schematic diagram 2.1 Pin definition Figure 2 LoRa-E5 Pin arrangement Table 1 LoRa-E5 pinout 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 5 / 18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Number Name Type Description VCC GND PA13 PA14 PB15 PA15 PB4 PB3 PB7 PB6 PB5 PC1 PC0 GND RFIO GND RST PA3 PA2 PB10 PA9 GND PA0 PB13 PB9 PB14 PA10 PB0
I I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O
I/O I/O I/O I/O I/O
I/O I/O I/O I/O I/O I/O Supply voltage for the module Ground SWDIO of SWIM for program download SWCLK of SWIM for program download SCL of I2C2 from MCU SDA of I2C2 from MCU MCU GPIO MCU GPIO UART1_RX from MCU UART1_TX from MCU MCU GPIO MCU GPIO LPUART1_TX from MCU MCU GPIO LPUART1_RX from MCU I/O RF input/output Ground Ground Reset trigger input for MCU MCU GPIOUSART2_RX from MCU MCU GPIOUSART2_TX from MCU MCU GPIO MCU GPIO Ground MCU GPIO SPI2_SCK from MCU; Boot pin(Active low) SPI2_NSS from MCU SPI2_MISO from MCU SPI2_MOSI from MCU UnavailableSuspended treatment 3 Electrical characteristics 3.1 Extreme working conditions Reaching or exceeding the maximum ratings listed in the table below can cause equipment damage. Table 2 Absolute Maximum Ratings Item Description min max unit 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 6 / 18 VCCmr Supply voltage Tmr Pmr Ambient temperature RF input power
-0.3
-40
+3.9
+85
+10 V dBm 3.2 Normal working conditions Table 3 Recommended Operating Conditions Item Description VCCop Supply voltage Top Pop Ambient temperature RF input power 3.3 Module specifications ITEMs Parameter Specifications Structure min
+1.8
-40
max
+3.6
+85
+10 unit V dBm Size Package power supply Sleep current Operation current
(Transmitter+MCU) Operation current
(Receiver+MCU) Sensitivity Harmonics Table 4 LoRa-E5 features 12(W) X 12(L) X 2.5(H) 28 pins, SMT 3.3V type 2.1uA (WDT on);
50mA @10dBm in 434MHz type 111mA @22dBm in 470MHz type 111mA @22dBm in 868MHz type 6.7mA @BW125kHz, 434MHz type 6.7mA @BW125kHz, 470MHz type 6.7mA @BW125kHz, 868MHz type 10dBm max @434MHz 22dBm max @868MHz
@SF12, BW125kHz Fr(MHz) min 434 470 868
<-36dBm below 1GHz
<-40dBm above 1GHz RF port type
-134.5
-136.5
-135 max
-136
-137.5
-137 Unit mm V uA mA mA dBm dBm dBm dBm Interface RFIO UART 3 group of UART, include 2pins 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 7 / 18 Electrical Characteristics Output power 22dBm max @470MHz I2C ADC NRST SPI 1 group of I2C, include 2 pins 1 ADC Input, include 1pins,12-bit 1Msps Manual reset pin input 1 group of SPI, include 4 pins 4 Typical RF performance test 4.1 LoRa-E5-LF Performance Testing Figure 3 RF Power vs Voltage434~510MHz Figure 4 RF Power VS Temperature434~510MHz 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 8 / 18 Figure 5 RF Receiver Sensitivity vs Spreading factor434~510MHz Figure 6 RF Receiver Sensitivity VS Temperature470MHz 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 9 / 18 Figure 7 Harmonic(25MHz~1GHz)@Frf=470MHz, TXOP=22dBm Figure 8 Harmonic(1GHz~3GHz)@Frf=470MHz, TXOP=22dBm 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 10 / 18 4.2 LoRa-E5-HF Performance Testing Figure 9 RF Power vs Voltage868~928MHz Figure 10 RF Power VS Temperature868~928MHz 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 11 / 18 Figure 11 RF Receiver Sensitivity vs Spreading factor868~928MHz Figure 12 RF Receiver Sensitivity VS Temperature868MHz 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 12 / 18 Figure 13 RF Receiver Sensitivity VS Temperature915MHz Figure 14 Harmonic(25MHz~1GHz)@Frf=868MHz, TXOP=22dBm 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 13 / 18 Figure 15 Harmonic(1GHz~3GHz)@Frf=868MHz, TXOP=22dBm 5 Application information 5.1 Package information LoRa-E5 has a 28-pin SMD package:
Figure 16 LoRa-E5 Module appearance 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 14 / 18 The following figure shows the recommended Layout package dimensions. Figure 17 PCB layout 5.2 External interface of the module In addition to several necessary GPIO ports and a set of SPI ports used for internal RF transceiver control, other GPIOs of the MCU have been derived, including UART (for AT commands), I2C, ADC, etc. For customers who want to develop software on the MCU of the module, these rich GPIO interfaces are very useful for users who need to expand peripherals. 5.3 Reference design based on LoRa-E5 module LoRa-E5 embeds the global LoRaWAN protocol and AT instruction set. This will make the design of LoRaWAN nodes based on this module very easy. The following is a typical reference design that uses LoRa-E5 to quickly start a LoRaWAN application. Just connect UART and NRST to the host MCU and send AT commands. In addition,Pin24 grounding of the module will force the module to enter Boot upgrade mode. Note: The 28-pin PB0 must be left floating and not allowed to be pulled up or grounded. 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 15 / 18 Figure 18 Reference design based on LoRa-E5 6 LoRaWAN application information 6.1 LoRaWAN application The topology of the LoRaWAN network is a star network, and the gateway acts as a relay between nodes and network servers. The gateway is connected to the network server through a standard IP link, and the node device uses LoRa or FSK to communicate with one or more gateways. Communication is bidirectional, although it is mainly upstream communication from the node to the network server. The communication between the node and the gateway uses different frequencies and rates. The choice of rate is a compromise between power consumption and distance, and different rates do not interfere with each other. According to different spreading factors and bandwidths, the rate of LoRa can be from 300bps to 50Kbps. In order to maximize battery life and network capacity, the network server manages the node's rate and output power through rate adaptation (ADR). The node device may transmit on a random channel at any time and at any rate, as long as the following conditions are met:
1) The channel currently used by the node is pseudo-random. This makes the system more resistant to interference 2) The maximum transmission time (dwell time of the channel) and duty cycle of the node depends on the frequency band used and local regulations LoRa-E5 module integrates ST ultra-low power IC STM32WLE5JC. The current is only 2.1uA in sleep mode, this module is very suitable for various applications of LoRaWAN. 6.2 Design LoRaWAN wireless sensor based on LoRa-E5 LoRa-E5 is an AT instruction set that encapsulates the global LoRaWAN standard protocol. The customer only needs a very simple MCU as the main control, and can control the LoRa-E5 through the serial port, thereby easily implementing the LoRaWAN protocol. This helps customers quickly bring sensor products to the LoRaWAN market. 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 16 / 18 Figure 19 Design of LoRaWAN wireless sensor based on LoRa-E5 module 7 Ordering information Technical Support: sensecap@seeed.cc Sales: iot@seeed.cc Table 5 Ordering Information Part Number MCU LoRa-E5-LF ROM 256KB / RAM 64KB TX Power (dBm) 10@LF(434MHz) 22@LF (470MHz) LoRa-E5-HF ROM 256KB / RAM 64KB 22@HF (868/915MHz) AT Modem Yes Yes 8 Reversion V1.0 2020-07-20 First release 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 17 / 18 ORIGINAL EQUIPMENT MANUFACTURER (OEM) NOTES The OEM must certify the final end product to comply with unintentional radiators (FCC Sections 15.107 and 15.109) before declaring compliance of the final product to Part 15 of the FCC rules and regulations. Integration into devices that are directly or indirectly connected to AC lines must add with Class II Permissive Change. The OEM must comply with the FCC labeling requirements. If the modules label is not visible when installed, then an additional permanent label must be applied on the outside of the finished product which states:
Contains transmitter module FCC ID: Z4T-LORA-E5. Additionally, the following statement should be included on the label and in the final products user manual: 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 interferences, and
(2) this device must accept any interference received, including interference that may cause undesired operation. The module is limited to installation in mobile or fixed applications. Separate approval is required for all other operating configurations, including portable configuration with respect to Part 2.1093 and different antenna configurations. A module or modules can only be used without additional authorizations if they have been tested and granted under the same intended enduse operational conditions, including simultaneous transmission operations. When they have not been tested and granted in this manner, additional testing and/or FCC application filing may be required. The most straightforward approach to address additional testing conditions is to have the grantee responsible for the certification of at least one of the modules submit a permissive change application. When having a module grantee file a permissive change is not practical or feasible, the following guidance provides some additional options for host manufacturers. Integrations using modules where additional testing and/or FCC application filing(s) may be required are: (A) a module used in devices requiring additional RF exposure compliance information (e.g., MPE evaluation or SAR testing); (B) limited and/or split modules not meeting all of the module requirements; and (C) simultaneous transmissions for independent collocated transmitters not previously granted together. This Module is full modular approval, it is limited to OEM installation ONLY. Integration into devices that are directly or indirectly connected to AC lines must add with Class II Permissive Change. (OEM) Integrator has to assure compliance of the entire end product include the integrated Module. Additional measurements (15B) and/or equipment authorizations (e.g. Verification) may need to be addressed depending on co-location or simultaneous transmission issues if applicable. (OEM) Integrator is reminded to assure that these installation instructions will not be made available to the end user 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 18 / 18 This equipment complies with FCC RF radiation exposure limits set forth for an uncontrolled environment. 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.
(2) This device must accept any interference received, including interference that may cause undesired operation. NOTE: 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
- This device and its antenna(s) must not be co-located or operating in conjunction with any other antenna or transmitter. NOTE: The manufacturer is not responsible for any radio or TV interference caused by unauthorized modifications to this equipment. Such modifications could void the users authority to operate the equipment. 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 19 / 18