MICROCHIP RN2903 LoRa Technology PICtail PICtail Plus Daughter Board User Guide

MICROCHIP RN2903 LoRa Technology PICtail PICtail Plus Daughter Board

INTRODUCTION

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© 2015, Microchip Technology Incorporated, Printed in the
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ISBN: 978-1-63277-885-7

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available.
Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is “DSXXXXXXXXA”, where “XXXXXXXX” is the document number and “A” is the revision level of the document. For the most up-to-date information on development tools, see the MPLAB® IDE online help. Select the Help menu, and then Topics to open a list of available online help files.

INTRODUCTION

This chapter contains general information that will be useful to know before using the RN2903 LoRa™ Technology PICtail™/PICtail Plus Daughter Board. Items discussed in this chapter include:

• Document Layout
• Conventions Used in this Guide
• Recommended Reading
• The Microchip Web Site
• Development Systems Customer Change Notification Service
• Customer Support
• Document Revision History

DOCUMENT LAYOUT
This document describes how to use the RN2903 LoRa Technology PICtail/PICtail Plus Daughter Board as a development tool to emulate and debug firmware on a target board, as well as how to program devices.
The document is organized as follows:

• Chapter 1. “Overview” – This chapter describes the RN2903 LoRa Technology PICtail/PICtail Plus Daughter Board and presents various board configurations.
• Chapter 2. “Getting Started” – This chapter describes the two main communication modes and the hardware requirements for getting started with RN2903 LoRa Technology PICtail/PICtail Plus Daughter Board.
• Appendix A. “Board Schematic and PCB Details” – This appendix provides the RN2903 LoRa Technology PICtail/PICtail Plus Daughter Board‘s schematic, PCB layouts, and Bill of Materials (BOM).

CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Arial font:
Italic characters| Referenced books| MPLAB ® IDE User’s Guide
Emphasized text| …is the only compiler…
Initial caps| A window| the Output window
A dialog| the Settings dialog
A menu selection| select Enable Programmer
Quotes| A field name in a window or dialog| “Save project before build”
Underlined, italic text with right angle bracket| A menu path| _ _File

Save__
Bold characters| A dialog button| Click OK
A tab| Click the Power tab
N‘Rnnnn| A number in verilog format, where N is the total number of digits, R is the radix and n is a digit.| 4‘b0010, 2‘hF1
Text in angle brackets < >| A key on the keyboard| Press ,
Courier New font:
Plain Courier New| Sample source code| #define START
Filenames| autoexec.bat
File paths| c:\mcc18\h
Keywords| _asm, _endasm, static
Command-line options| -Opa+, -Opa-
Bit values| 0, 1
Constants| 0xFF, ‘A’
Italic Courier New| A variable argument| file.o, where file can be any valid filename
Square brackets [ ]| Optional arguments| mcc18 [options] file [options]
Curly brackets and pipe character: { | }| Choice of mutually exclusive arguments; an OR selection| errorlevel {0|1}
Ellipses…| Replaces repeated text| var_name [, var_name…]
Represents code supplied by user| void main (void) { … }

RECOMMENDED READING
This user’s guide describes how to use RN2903 LoRa Technology PICtail/PICtail Plus Daughter Board. Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference resources: RN2903 Low-Power Long Range LoRa™ Technology Transceiver Module Data Sheet (DS50002390) This data sheet provides detailed specifications for the RN2903 module. RN2903 LoRa™ Technology Module Command Reference User’s Guide (DS40001811)
This command reference user’s guide describes how to configure the RN2903 module and includes a description of communication and command references.

THE MICROCHIP WEB SITE
Microchip provides online support via our web site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains the following information:

• Product Support – Data sheets and errata, application notes and sample programs, design resources, user’s guides and hardware support documents, latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical support requests, online discussion groups, Microchip consultant program member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives

DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE
Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest. To register, access the Microchip web site at www.microchip.com, click on Customer Change Notification and follow the registration instructions. The Development Systems product group categories are:

• Compilers – The latest information on Microchip C compilers and other language tools
• Emulators – The latest information on the Microchip MPLAB® REAL ICE™ in-circuit emulator
• In-Circuit Debuggers – The latest information on the Microchip in-circuit debuggers. This includes MPLAB ICD 3 in-circuit debuggers and PICkit™ 3 debug express
• MPLAB X IDE – The latest information on Microchip MPLAB X IDE, the Windows® Integrated Development Environment for development systems tools
• Programmers – The latest information on Microchip programmers including the PICkit™ 3 development programmer

CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:

• Distributor or Representative
• Local Sales Office
• Field Application Engineer (FAE)
• Technical Support

Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the website at: http://www.microchip.com/support.

DOCUMENT REVISION HISTORY
Revision A (October 2015)
This is the initial release of this document.

Overview

INTRODUCTION
The RN2903 LoRa™ Technology PICtail™/PICtail Plus Daughter Board is a demonstration board that showcases the Microchip RN2903 Low-Power Long Range, LoRa™ Technology Transceiver Module.
The RN2903 LoRa Technology PICtail/PICtail Plus Daughter Board provides access to the RN2903 UART and General Purpose Input and Output (GPIO) ports.
This chapter includes the following topics:

• Features
• Contents
• Board Configuration

FEATURES
The RN2903 LoRa Technology PICtail/PICtail Plus Daughter Board has the following features as represented in Figure 1-1:

1. Microchip RN2903 Low-Power Long Range, LoRa™ Technology Transceiver Module
2. SMA connector for 915 MHz band
3. Solder pads around the module for GPIOs, power pins, and communication signals
4. Supply current measurement points
5. On-board LDO
6. UART traffic LEDs
7. ICSP header to program the on-board PIC18 MCU
8. USB connector
9. PICtail connection interface
10. PICtail Plus connection interface
11. PIC18 MCU for custom functions

FIGURE 1-1: RN2903 LoRa™ TECHNOLOGY PICtail™/PICtail PLUS DAUGHTER BOARD

The high-speed UART interface and the GPIO ports are available on the module to configure, control, and transfer data. The RN2903 LoRa Technology PICtail/PICtail Plus Daughter Board has PICtail and PICtail Plus connectors to interface with a PIC® Microcontroller (MCU) on the development boards that support PICtail or PICtail Plus interface with the required pin mapping. The PICtail board also has an on-board PIC18 MCU preprogrammed to provide a simple USB-to-UART serial bridge, enabling easy serial connection. This MCU is available for custom user functions by reprogramming.
The demonstration of the RN2903 is performed by plugging the daughter board into a USB port of a PC. The USB port powers the daughter board and enables the user to communicate using the RN2903’s ASCII commands.
The development of the RN2903 with Microchip’s PIC MCU line is either possible by plugging the 28-pin PICtail connector into a PIC18 Explorer, or by plugging into the 30 pin card edge PICtail Plus connector to an Explorer 16.

CONTENTS
The package kit contents contain the following tools as listed in.
TABLE 1-1: RN2903 LoRa™ TECHNOLOGY PICtail™/PICtail PLUS

BOARD CONFIGURATION
Prior to plugging the module into the motherboard’s socket, ensure that one of the current measure jumpers, CUR1 or CUR2, are shunted.
PICtail Daughter Board can be powered from two sources, either from one of the PICtail headers or from USB. Both power sources can be active at the same time.
RF antenna must be connected to the SMA connector before attaching power supply to the board.
Ensure that the applied power supply voltage does not exceed board limits. Figure 1-2, Figure 1-3, and Figure 1-4 show the connections to various development boards.

FIGURE 1-2: RN2903 LoRa™ TECHNOLOGY PICtail™/PICtail PLUS DAUGHTER BOARD CONNECTED TO EXPLORER 16 DEVELOPMENT BOARD

FIGURE 1-3: RN2903 LoRa™ TECHNOLOGY PICtail™/PICtail PLUS DAUGHTER BOARD CONNECTED TO PIC18 WIRELESS DEVELOPMENT BOARD

FIGURE 1-4: RN2903 LoRa™ TECHNOLOGY PICtail™/PICtail PLUS DAUGHTER BOARD CONNECTED TO PICDEM™ PIC18 EXPLORER DEMONSTRATION BOARD

Getting Started

INTRODUCTION
This chapter describes the hardware requirements for RN2903 LoRa Technology PICtail/PICtail Plus Daughter Board. The module accepts commands via UART interface. The UART interface can be routed either to the onboard USB port or one of the PICtail or PICtail Plus connector. Basically, two communication modes are supported by the daughter board, USB mode and PICtail mode. PICtail mode gives more computing power to the user program, since motherboards contain additional MCUs.
This chapter includes the following topics:

• Communication Modes
• Communication to the Module
• Hardware Description

COMMUNICATION MODES

• USB mode
  The USB mode is initiated when the daughter board is connected to a USB port via a mini-USB cable. In this mode, the on-board PIC18 MCU provides a USB-to- UART bridge. Supply voltage is provided via USB and the on-board LDO (IC1) which regulates 5V to the nominal 3.3V.

• PICtail mode
  The PICtail mode is initiated when no USB cable is attached to the board, and the board is plugged into the appropriate motherboard.
  Note: The user must ensure that the PICtail/PICtail Plus port pins are fully compatible with the pinout of the daughter board.
  When the daughter board is not powered from the USB, the on-board PIC18 MCU does not influence UART communication.
  Note: Some motherboards may adjust the supply voltage to the attached MCU Plug-in Module. Do not exceed the supply voltage limits of the module.

• USB mode while the board is powered from the PICtail
  The daughter board can be used in a third mode when it is connected to a PICtail motherboard while the USB is also connected. It is useful when the user wants to set the supply voltage from the PICtail connector while the communication must be continuously active via the USB interface. The on-board PIC18 MCU takes over the control of the UART interface. In this case, the motherboard is unable to send UART messages to the module. However, the messages sent by the module are seen on the PICtail UART’s Module_TX line.

In instances wherein the motherboard does not have power supply, it can be powered from the USB together with the daughter board. The user must take care of the maximum output current of the on-board LDO, which is 500 mA.
A short on the jumper JP_RST on the daughter board forces the board to operate in PICtail mode, although the USB remains connected. The jumper JP_RST keeps the on-board PIC18 MCU in Reset state to ensure that USB-to-UART protocol translation is not performed in this mode. If the jumper JP_RST is not shorted, the on-board PIC18 MCU has the priority over the UART communication. This function is only available with the 30-pin PICtail Plus connection, not for the 28-pin PICtail platform.

COMMUNICATION TO THE MODULE
In PICtail mode, the Microchip 8/16/32-bit PIC MCUs on the motherboards can run custom functions and connect to the module using the UART interface, which accepts ASCII commands from the host.
In USB mode, when the daughter board is connected to the host via USB, the on- board PIC18 MCU uses the CDC class to create a USB-to-UART bridge device. The host can run a simple terminal emulator application to issue commands.

HARDWARE DESCRIPTION
The RF signal path is connected to the SMA edge connector.The current consumption measurement of the module is supported by the on-board current measure jumpers. If jumper CUR1 is shunted, the supply current flows directly to the module.
There are two ways to measure current consumption:

1. A current meter can be connected to CUR1 jumper pins to measure the actual current consumption of the module. CUR2 must be left open.
2. The current consumption graph can be recorded in the time domain by removing the shunt from CUR1 jumper and shunting CUR2 at the same time. Use a two-channel oscilloscope, which supports subtracting mathematical function. Connect oscilloscope probes to CUR1 jumper pins while CUR2 jumper is shunted. Set the oscilloscope to display the difference between the two chan-nels.

All pins of the module can be accessed via through hole pads which are classified into two groups located on both sides of the module. The user can mount two 1.27 mm pitched socket headers if required. Sockets can connect the module pins to a custom board, whereas the daughter board provides the power. Both through hole pad groups, J1 and J2, have dedicated pads on which power is delivered to the custom board. The supply current is measured together with the module’s supply current. To do this, JP2 must be shorted for J2 and JP3 shorted for J1.
If the supply current is separated from the module, the two other jumpers must be shorted. To power the custom board separately, shunt JP1 or JP4.
The on-board PIC18 MCU is programmable via programming port ICSP_IC2. In USB mode, LD1 and LD2 LEDs indicate communication on the UART.

TABLE 2-1: PICtail AND PICtail PLUS CONNECTIONS

Signal Name| Description| Pin number on PICtail connector| Pin number on PICtail Plus connector
---|---|---|---
+3V3| Positive Supply Rail| 26| 21, 22
GND| Ground Supply Rail| 28| 9, 10, 16
Module_TX| UART transmit output of the module| 21| 2
Module_RX| UART receive input of the module| 17| 4
Module_RTS| UART Hardware handshake output of the module( 1 )| 4| 19
Module_CTS| UART Hardware handshake input of the module( 1 )| 3| 20
PT_Module_RESET| Master Clear input of the module| 1| 6
PT+_SENSE| Sensing signal for PICtail Plus connector (The platform connects this line to GND when plugged.)| —| 15

Note 1: Optional handshake lines are supported in future firmware releases.

Appendix A. Board Schematic and PCB Details

INTRODUCTION
This appendix provides the RN2903 LoRa Technology PICtail/PICtail Plus Daughter Board schematic, PCB layout, and Bill of Materials (BOM).

• Board Schematic
• PCB Layout
• Bill of Materials

BOARD SCHEMATIC
Figure A-1 shows the board schematic.

FIGURE A-1: RN2903 LoRa™ TECHNOLOGY PICtail™/PICtail PLUS DAUGHTER BOARD SCHEMATIC

PCB LAYOUT
RN2903 LoRa Technology PICtail/PICtail Plus Daughter Board is a 2-layer, FR4, 1.55 mm, plated through hole PCB construction.
Figure A-2 through Figure A-4 illustrate the PCB layers, and Figure A-5 shows the assembly drawing of LoRa Technology PICtail/PICtail Plus Daughter Board.

FIGURE A-2: RN2903 LoRa™ TECHNOLOGY PICtail™/PICtail PLUS DAUGHTER BOARD TOP SILKSCREEN

FIGURE A-3: RN2903 LoRa™ TECHNOLOGY PICtail™/PICtail PLUS DAUGHTER BOARD TOP COPPER

FIGURE A-4: RN2903 LoRa™ TECHNOLOGY PICtail™/PICtail PLUS DAUGHTER BOARD BOTTOM COPPER (BOTTOM VIEW)

FIGURE A-5: RN2903 LoRa™ TECHNOLOGY PICtail™/PICtail PLUS DAUGHTER BOARD TOP ASSEMBLY

BILL OF MATERIALS

TABLE A-1: RN2903 LoRa™ TECHNOLOGY PICtail™/PICtail PLUS DAUGHTER BOARD BILL OF MATERIALS (BOM)

GRM188R71E105KA12D
C2| 470 nF| CAP, 0603, 25V, 10%, X7R| Murata Electronics North America| GRM188R71E474KA12D
C4| 100 nF| CAP, 0603, 25V, Y5V| Yageo| CC0603ZRY5V8BB104
C5| 10 µF| CAP, 0603, 6.3V, 20%, X5R| Murata Electronics North America| GRM188R60J106ME47D
C6| 10 nF| CAP, 0603, 50V, 10%, X7R| Murata Electronics North America| GRM188R71H103KA01D
C8| 4.7 µF| CAP, 0603, 6.3V, 10%, X5R| Murata Electronics North America| GRM188R60J475KE19D
CUR1, CUR2| —| CONN Pin 2 2.54 mm_jumper| Harwin, Inc.| M20-9990245
D1| —| DIODE SCHOTTKY 20V 0.5A SOD123| Diodes, Inc.| B0520LW-7-F
GND| —| CONN Pin 1| Keystone| 5012
IC1| —| IC MCP1825-3302E/DC| Microchip| MCP1825-3302E/DC
IC2| —| IC PIC18LF25K50-I/ML| Microchip| PIC18LF25K50-I/ML
JP2, JP4| —| RES 0 OHM 0603 JUMPER 2P| Vishay Dale| CRCW06030000Z0EA
JP-S1| —| JUMPER SHUNT 2POS 2.54 mm LOPRO GOLD| TE Connectivity| 382811-8
LD1, LD2| —| LED 565NM GRN DIFF 0603| Lumex Opto/Components, Inc.| SML- LX0603GW-TR
PICTail| —| CONN Pin 14×2 2.54 mm right angle (PBC14DBDN)| Sullins Connector Solutions| PBC14DBDN
R1| 1.00W| RES 0603 1/10W 1%| Yageo| RC0603FR-071RL
R2| 1.50 kW| RES 0603 1/10W 1%| Vishay Dale| CRCW06031K50FKEA
R3| 2.70 kW| RES 0603 1/10W 1%| Vishay Dale| CRCW06032K70FKEA
R4, R5, R6, R9, R10| 220W| RES 0603 1/10W 1%| Vishay Dale| CRCW0603220RFKEA
R7| 100W| RES 0603 1/10W 1%| Vishay Dale| CRCW0603100RFKEA
R8| 4.70 kW| RES 0603 1/10W 1%| Vishay Dale| CRCW06034K70FKEA
RFH| —| CONN JACK SMA 50 OHM EDGE MOUNT| Cinch Connectivity Solutions Johnson| 142-0711-821
U1| —| RF module RN2903 LoRa 915 MHz| Microchip| RN2903
USB| —| CONN MINI B USB R/A SMD| Hirose| UX60-MB-5ST

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References

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