MICROCHIP TECHNOLOGY RN2903 RN2903 Module User Manual RN2903

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RN2903
Low-Power Long Range LoRa® Technology
Transceiver Module
General Features
•
•
•
•
On-board LoRaWAN™ protocol stack
ASCII command interface over UART
Compact form factor: 17.8 x 26.7 x 3.34 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” (DS40001811)
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
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
RF/Analog Features
• Low-Power Long Range Transceiver operating in
the 915 MHz frequency band
• High Receiver Sensitivity: down to -146 dBm
• TX Power: adjustable up to +18.5 dBm high
efficiency PA
• FSK, GFSK, and LoRa Technology modulation
• IIP3 = -11 dBm
• Up to 15 km coverage at suburban and up to 5 km
coverage at urban area
 2015 Microchip Technology Inc.
•
•
•
•
•
•
Automated Meter Reading
Home and Building Automation
Wireless Alarm and Security Systems
Industrial Monitoring and Control
Machine to Machine (M2M)
Internet of Things (IoT)
DS50002390B-page 1
RN2903
Table of Contents
1.0 Device Overview .......................................................................................................................................................................... 3
2.0 General Specifications ................................................................................................................................................................. 6
3.0 Typical Hardware Connections..................................................................................................................................................... 8
4.0 Physical Dimensions .................................................................................................................................................................... 9
5.0 Application Information............................................................................................................................................................... 10
6.0 Regulatory Approval ................................................................................................................................................................... 14
Appendix A: Revision History ............................................................................................................................................................... 19
The Microchip Web Site ....................................................................................................................................................................... 21
Customer Change Notification Service ................................................................................................................................................ 21
Customer Support ................................................................................................................................................................................ 21
Product Identification System............................................................................................................................................................... 23
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip
products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and
enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via
E-mail at docerrors@microchip.com. We welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current
devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision
of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
• Microchip’s Worldwide Web site; http://www.microchip.com
• Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are
using.
Customer Notification System
Register on our web site at www.microchip.com to receive the most current information on all of our products.
DS50002390B-page 2
 2015 Microchip Technology Inc.
RN2903
1.0
DEVICE OVERVIEW
The RN2903 transceiver module features LoRa
Technology RF modulation, which provides long range
spread spectrum communication with high interference
immunity.
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.
Using LoRa Technology modulation technique,
RN2903 can achieve a receiver sensitivity of -146 dBm.
The high sensitivity combined with the integrated
+18.5 dBm output power amplifier yields industry
leading link budget, which makes it optimal for
applications requiring extended range and robustness.
The RN2903 module delivers exceptional phase noise,
selectivity, receiver linearity, and IIP3 for significantly
lower power consumption. The level of conductive
harmonics is below -70 dBm. Figure 1-1, Figure 1-2,
and Figure 1-3 show the top view, the pinout, and the
block diagram of the module.
FIGURE 1-1:
FIGURE 1-2:
GND 20
NC 19
30 TEST0
31 TEST1
NC 18
NC 17
32 RESET
33 GND
NC 16
NC 15
34 VDD
35 GPIO0
GPIO10 14
GPIO11 13
36 GPIO1
37 GPIO2
VDD 12
GND 11
38 GPIO3
39 GPIO4
GPIO12 10
GPIO13 9
GND 8
40 GPIO5
41 GND
UART_RX 7
UART_TX 6
42 NC
43 GPIO6
RESERVED 5
RESERVED 4
44 GPIO7
45 GPIO8
UART_CTS 3
UART_RTS 2
GND 1
46 GPIO9
47 GND
FIGURE 1-3:
GND 22
GND 21
28 GND
29 NC
NC 25
GND 24
RF 23
RN2903 PIN DIAGRAM
GND 27
GND 26
RN2903 TOP VIEW
RN2903 BLOCK DIAGRAM
Host MCU
RN2903 Module
MCU
UART
Command Processor
LoRaWANTM Protocol Stack
14 GPIO Pins
I2C
Real Time
Clock
SPI
EUI-64
EEPROM
32768 Hz
Crystal
LoRa® Technology
Radio
User Hardware:
Status LEDs, 6witches, /ogic IOs, etc.
 2015 Microchip Technology Inc.
Antenna
915 MHz
DS50002390B-page 3
RN2903
Table 1-1 describes the pins of the module.
TABLE 1-1:
Pin
PIN DESCRIPTION
Name
Type
Description
GND
Power
Ground supply terminal
UART_RTS
Output
Communication UART RTS signal(1)
UART_CTS
Input
Communication UART CTS signal(1)
RESERVED
—
Do not connect
RESERVED
—
Do not connect
UART_TX
Output
Communication UART Transmit (TX)
UART_RX
Input
Communication UART Receive (RX)
GND
Power
Ground supply terminal
GPIO13
Input/Output
General purpose I/O pin
10
GPIO12
Input/Output
General purpose I/O pin
11
GND
Power
Ground supply terminal
12
VDD
Power
Positive supply terminal
13
GPIO11
Input/Output
General purpose I/O pin
14
GPIO10
Input/Output
General purpose I/O pin
15
NC
—
Not connected
16
NC
—
Not connected
17
NC
—
Not connected
18
NC
—
Not connected
19
NC
—
Not connected
20
GND
Power
Ground supply terminal
21
GND
Power
Ground supply terminal
22
GND
Power
Ground supply terminal
23
RF
RF analog
RF signal pin
24
GND
Power
Ground supply terminal
25
NC
—
Not connected
26
GND
Power
Ground supply terminal
27
GND
Power
Ground supply terminal
28
GND
Power
Ground supply terminal
29
NC
—
Not connected
30
TEST0
—
Do not connect
31
TEST1
—
Do not connect
32
RESET
Input
Active-low device Reset input
33
GND
Power
Ground supply terminal
34
VDD
Power
Positive supply terminal
35
GPIO0
Input/Output
General purpose I/O pin
36
GPIO1
Input/Output
General purpose I/O pin
37
GPIO2
Input/Output
General purpose I/O pin
38
GPIO3
Input/Output
General purpose I/O pin
39
GPIO4
Input/Output
General purpose I/O pin
40
GPIO5
Input/Output
General purpose I/O pin
41
GND
Power
Ground supply terminal
42
NC
—
Not connected
43
GPIO6
Input/Output
General purpose I/O pin
DS50002390B-page 4
 2015 Microchip Technology Inc.
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.
DS50002390B-page 5
RN2903
2.0
GENERAL SPECIFICATIONS
Table 2-1 provides the general specifications for the module. Table 2-2, Table 2-3, and Table 2-4 provide the electrical
characteristics, current consumption, and dimensions of the module. Table 2-5 shows the RF output power calibration
data.
TABLE 2-1:
GENERAL SPECIFICATIONS
Specification
Description
Frequency Band
902.000 MHz to 928.000 MHz
Modulation Method
FSK, GFSK, and LoRa® Technology modulation
Maximum Over-the-Air Data Rate
300 kbps with FSK modulation; 12500 bps with LoRa Technology modulation
RF Connection
Board edge connection
Interface
UART
Operation Range
Up to 15 km coverage at suburban; up to 5 km coverage at urban area
Sensitivity at 0.1% BER
-146 dBm(1)
RF TX Power
Adjustable up to max. +18.5 dBm on 915 MHz band(2)
Generated Conductive Harmonics Below -70 dBm
Level
Temperature (operating)
-40°C to +85°C
Temperature (storage)
-40°C to +115°C
Humidity
10% ~ 90%
Non-condensing
Note 1: Depends on modulation. Expand Spreading Factor (SF).
2: TX power is adjustable. For more information, refer to the “RN2903 LoRa® Technology Module Command
Reference User’s Guide” (DS40001811).
TABLE 2-2:
ELECTRICAL CHARACTERISTICS
Parameter
Supply Voltage
Min.
Typ.
Max.
Units
2.1
—
3.6
Voltage on any pin with respect to VSS (except VDD)
-0.3
—
VDD + 0.3
Voltage on VDD with respect to VSS
-0.3
—
3.9
Input Clamp Current (IIK) (VI < 0 or VI > VDD)
—
—
+/-20
mA
Output Camp Current (IOK) (VO < 0 or VO > VDD)
—
—
+/-20
mA
GPIO sink/source current each
—
—
25/25
mA
Total GPIO sink/source current
—
—
200/185
mA
RAM Data Retention Voltage (in Sleep mode or Reset state)
1.5
—
—
VDD Start Voltage to ensure internal Power-on Reset signal
—
—
0.7
VDD Rise Rate to ensure internal Power-on Reset signal
0.05
—
—
V/ms
Brown-out Reset Voltage
1.75
1.9
2.05
Logic Input Low Voltage
—
—
0.15 x VDD
Logic Input High Voltage
0.8 x VDD
—
—
Input Leakage at <25°C
(VSS
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