User's Guide

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 2015 Microchip Technology Inc. Advance Information DS00000A-page 1

RN2903

General Features

• On-board LoRaWAN™ Class A protocol stack

• ASCII command interface over UART

• Compact form factor: 17.8 x 26.7 x 3 mm

• Castellated SMT pads for easy and reliable PCB

mounting

• Environmentally friendly, RoHS compliant

• Compliance:

- Modular Certified for the United States (FCC)

and Canada (IC)

- Australia and New Zealand

• Device Firmware Upgrade (DFU) over UART (see

“RN2903 LoRa™ Technology Module Command

Reference User’s Guide” DS40000000A)

Operational

• Single operating voltage: 2.1V to 3.6V (3.3V

typical)

• Temperature range: -40°C to +85°C

• Low-power consumption

• Programmable RF Communication Bit Rate up to

300 kbps with FSK modulation, 12500 bps with

LoRa™ Technology modulation

• Integrated MCU, Crystal, EUI-64 Node Identity

Serial EEPROM, Radio Transceiver with Analog

Front End, Matching Circuitry

• 14 GPIOs for control and status

RF/Analog Features

• Low-Power Long Range Transceiver operating in

the 915 MHz frequency band

• High Receiver Sensitivity: down to -148 dBm

• TX Power: adjustable up to +20 dBm high

efficiency PA

• FSK, GFSK, and LoRa Technology modulation

• IIP3 = -11 dBm

• >15 km coverage at suburban and >5 km

coverage at urban area

Description

Microchip’s RN2903 Low-Power Long Range LoRa

Technology Transceiver module provides an easy to

use, low-power solution for long range wireless data

transmission. The advanced command interface offers

rapid time to market.

The RN2903 module complies with the LoRaWAN

Class A protocol specifications. It integrates RF, a

baseband controller, command Application

Programming Interface (API) processor, making it a

complete long range solution.

The RN2903 module is suitable for simple long range

sensor applications with external host MCU.

Applications

• Automated Meter Reading

• Home and Building Automation

• Wireless Alarm and Security Systems

• Industrial Monitoring and Control

• Machine to Machine

• Internet of Things (IoT)

Low-Power Long Range LoRa™ Technology

Transceiver Module

CYPRESS ENVIROSYSTEMS: MODULE 121-33089

Summary of content (24 pages)

PAGE 1
CYPRESS ENVIROSYSTEMS: MODULE 121-33089 RN2903 Low-Power Long Range LoRa™ Technology Transceiver Module General Features • • • • On-board LoRaWAN™ Class A protocol stack ASCII command interface over UART Compact form factor: 17.8 x 26.
PAGE 2
RN2903 Table of Contents 1.0 Device Overview .......................................................................................................................................................................... 3 2.0 General Specifications.................................................................................................................................................................. 6 3.0 Typical Hardware Connections.......................................................................
PAGE 3
RN2903 DEVICE OVERVIEW LoRa Technology modulation also provides significant advantages in both blocking and selectivity compared to the conventional modulation techniques, solving the traditional design compromise between extended range, interference immunity, and low-power consumption. The RN2903 transceiver module features LoRa Technology RF modulation, which provides long range spread spectrum communication with high interference immunity.
PAGE 4
RN2903 Table 1-1 describes the module’s pins.
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RN2903 TABLE 1-1: Pin PIN DESCRIPTION (CONTINUED) Name Type Description 44 GPIO7 Input/Output General purpose I/O pin 45 GPIO8 Input/Output General purpose I/O pin 46 GPIO9 Input/Output General purpose I/O pin 47 GND Power Ground supply terminal Note 1: Optional handshake lines are supported in future firmware releases.  2015 Microchip Technology Inc.
PAGE 6
RN2903 2.0 GENERAL SPECIFICATIONS Table 2-1 provides the general specifications for the module. Table 2-2 and Table 2-3 provide the module's electrical characteristics and current consumption. Table 2-4 and Table 2-5 show the module's dimensions and the RF output power calibration data. TABLE 2-1: GENERAL SPECIFICATIONS Specification Description Frequency Band 902.000 MHz to 928.
PAGE 7
RN2903 TABLE 2-3: CURRENT CONSUMPTION Mode Typical Current at 3V (mA) Idle 2.7 RX 13.5 Deep Sleep 0.022 TABLE 2-4: TABLE 2-5: MODULE DIMENSIONS Parameter Value OUTPUT POWER OF TX POWER SETTING TX Power Setting Output Power (dBm) Typical Supply Current at 3V (mA) 2 3.0 42.6 3 4.0 44.8 4 5.0 47.3 5 6.0 49.6 Dimensions 17.8 x 26.7 x 3 mm 6 7.0 52.0 Weight 2.05g 7 8.0 55.0  2015 Microchip Technology Inc. 8 9.0 57.7 9 10.0 61.0 10 11.0 64.8 11 12.0 73.
PAGE 8
RN2903 3.0 TYPICAL HARDWARE CONNECTIONS Figure 3-1 shows the typical hardware connections. FIGURE 3-1: HARDWARE CONNECTIONS 915 MHz band RFH RN2903 Host MCU TX RX RX TX CTS(1) RTS RTS(1) CTS UART GPIOs 14 Status LEDs, switches, logic IOs, etc. Note 1: Optional handshake lines are supported in future firmware releases. 3.1 INTERFACE TO HOST MCU The RN2903 module has a dedicated UART interface to communicate with a host controller.
PAGE 9
RN2903 4.0 PHYSICAL DIMENSIONS Figure 4-1 and Figure 4-2 illustrate the physical dimensions and the recommended PCB layout for the RN2903 module. FIGURE 4-1: RN2903 PHYSICAL DIMENSIONS FIGURE 4-2: RECOMMENDED PCB FOOTPRINT Note: Host PCB top layer copper traces must have solder mask to avoid shorting test pins on the bottom of the module.  2015 Microchip Technology Inc.
PAGE 10
RN2903 5.0 APPLICATION INFORMATION 5.1 RF pins and strip line The RF signals must be routed with properly terminated 50 Ohm strip lines. Use curves instead of sharp corners. Keep the routing path as short as possible. Figure 5.3 shows a routing example. FIGURE 5-1: 5.2 RF ROUTING (EXAMPLE) Approved Antennas Modular certification of the RN2903 module was performed with the external antenna type mentioned in Table 5-1. Refer to Section 6.
PAGE 11
APPLICATION SCHEMATIC Figure 5-2 shows the schematic for the RN2903 PICtail™/PICtail Plus Daughter Board. PICTAIL™/PICTAIL PLUS DAUGHTER BOARD SCHEMATIC Current measure points 50 Ohm i +3V3 TEST GND +3V3 1 1 2 3 4 5 6 CUR1 +3V3_M RFH SMA R1 CUR2 USB 1 1% 0603 GND GND ID D+ D- +5V GND 5 4X 3 2 1 +3V3 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 +3V3_ext2 GP0 GP1 GP2 GP3 GP4 GP5 GP6 GP7 GP8 GP9 Socket 1.
PAGE 12
RN2903 6.0 REGULATORY APPROVAL This section outlines the regulatory information for the RN2903 module for the following countries: • • • • United States Canada Australia New Zealand 6.1 United States he RN2903 module has received Federal Communications Commission (FCC) CFR47 Telecommunications, Part 15 Subpart C “Intentional Radiators” modular approval in accordance with Part 15.212 Modular Transmitter approval.
PAGE 13
RN2903 6.1.2 RF EXPOSURE All transmitters regulated by FCC must comply with RF exposure requirements. KDB 447498 General RF Exposure Guidance provides guidance in determining whether proposed or existing transmitting facilities, operations or devices comply with limits for human exposure to Radio Frequency (RF) fields adopted by the Federal Communications Commission (FCC). From the RN2903 FCC Grant: Output power listed is conducted.
PAGE 14
RN2903 User manuals for transmitters equipped with detachable antennas shall also contain the following notice in a conspicuous location: This radio transmitter (identify the device by certification number, or model number if Category II) has been approved by Industry Canada to operate with the antenna types listed below with the maximum permissible gain and required antenna impedance for each antenna type indicated.
PAGE 15
RN2903 6.4 New Zealand RN2903 module RF transmitter test reports can be used in part to demonstrate compliance against the New Zealand "General User Radio License for Short Range Devices". New Zealand Radio communications (Radio Standards) Notice 2010 calls up the AS / NZS 4268:2008 industry standard. The RN2903 module test reports can be used as part of the product certification and compliance folder. For more information on the RF transmitter test reports, contact Microchip Technology.
PAGE 16
RN2903 NOTES: DS00000A-page 16 Advance Information  2015 Microchip Technology Inc.
PAGE 17
RN2903 APPENDIX A: REVISION HISTORY Revision A (June 2015) This is the initial release of this document.  2015 Microchip Technology Inc.
PAGE 18
RN2903 NOTES: DS00000A-page 18 Advance Information  2015 Microchip Technology Inc.
PAGE 19
RN2903 THE MICROCHIP WEB SITE CUSTOMER SUPPORT Microchip provides online support via our WWW site at www.microchip.com. This web site is used as a means to make files and information easily available to customers.
PAGE 20
RN2903 NOTES: DS00000A-page 20  2015 Microchip Technology Inc.
PAGE 21
RN2903 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. I RM XXX Device Temperature Range Package Firmware Revision Number Device: RN2903: Low-Power Long Range LoRa™ Technology Transceiver module Temperature Range: I = -40°C to +85°C (Industrial) Package: RM = Radio Module  2015 Microchip Technology Inc.
PAGE 22
RN2903 NOTES: DS00000A-page 22 Advance Information  2015 Microchip Technology Inc.
PAGE 23
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 24
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