RN2903
Low-Power Long Range LoRa
®
Technology
Transceiver Module
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)
- Taiwan
• Device Firmware Upgrade (DFU) over UART, see
“RN2903 LoRa
®
Technology Module Command
Reference User’s Guide”
(DS40001811)
•
•
•
•
General 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.
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, Shared with 13
Analog Inputs
Applications
•
•
•
•
•
•
Automated Meter Reading
Home and Building Automation
Wireless Alarm and Security Systems
Industrial Monitoring and Control
Machine to Machine (M2M)
Internet of Things (IoT)
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
2015-2018 Microchip Technology Inc.
DS50002390E-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 .................................................................................................................................................................. 10
5.0 Application Information................................................................................................................................................................11
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
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Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
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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
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To determine if an errata sheet exists for a particular device, please check with one of the following:
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When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are
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DS50002390E-page 2
2015-2018 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.
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.
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 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:
RN2903 TOP VIEW
FIGURE 1-2:
28
GND
29 NC
RN2903 PIN DIAGRAM
NC
25
GND
24
RF 23
GND
22
GND 27
GND
26
GND 21
30
PGC_INT
31 PGD_INT
GND
20
NC 19
NC
18
NC 17
32
RESET
33 GND
34
VDD
35
GPIO0
36
GPIO1
37
GPIO2
38 GPIO3
39
GPIO4
GPIO10 14
GPIO11
13
VDD
12
GND
11
NC
16
NC
15
40 GPIO5
41
GND
42
NC
43
GPIO6
44 GPIO7
45
GPIO8
46
GPIO9
47 GND
RESERVED 4
UART_CTS
3
UART_TX 6
RESERVED
5
GND 8
UART_RX
7
GPIO12 10
GPIO13 9
UART_RTS
2
GND 1
FIGURE 1-3:
RN2903 BLOCK DIAGRAM
Host MCU
RN2903 Module
MCU
UART
Command Processor
Protocol Stack
14 GPIO Pins
I
2
C
Real Time
Clock
SPI
EUI-64
EEPROM
32768 Hz
Crystal
LoRa
®
Technology
Radio
User Hardware:
Status LEDs, witches, ogic IOs, etc.
Antenna
915 MHz
2015-2018 Microchip Technology Inc.
DS50002390E-page 3
RN2903
Table 1-1
describes the RN2903 pins.
TABLE 1-1:
Pin
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
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
GND
PIN DESCRIPTION
Name
Power
Output
Input
—
—
Output
Input
Power
Input/Output
Input/Output
Power
Power
Input/Output
Input/Output
—
—
—
—
—
Power
Power
Power
RF analog
Power
—
Power
Power
Power
—
Input/Ouput
Input/Ouput
Input
Power
Power
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Power
—
Input/Output
Type
Ground supply terminal
Communication UART RTS signal
(1)
, or GPIO
Communication UART CTS signal
(1)
, or GPIO
Do not connect
Do not connect
Communication UART Transmit (TX)
Communication UART Receive (RX)
Ground supply terminal
General purpose I/O pin or analog input
General purpose I/O pin or analog input
Ground supply terminal
Positive supply terminal
General purpose I/O pin or analog input
General purpose I/O pin or analog input
Not connected
Not connected
Not connected
Not connected
Not connected
Ground supply terminal
Ground supply terminal
Ground supply terminal
RF signal pin
Ground supply terminal
Not connected
Ground supply terminal
Ground supply terminal
Ground supply terminal
Not connected
Internal MCU ICSP program clock or general purpose I/O pin
Internal MCU ICSP program data or general purpose I/O pin
Active-low device Reset input
Ground supply terminal
Positive supply terminal
General purpose I/O pin or analog input
General purpose I/O pin or analog input
General purpose I/O pin or analog input
General purpose I/O pin or analog input
General purpose I/O pin
General purpose I/O pin or analog input
Ground supply terminal
Not connected
General purpose I/O pin or analog input
Description
UART_RTS
UART_CTS
RESERVED
RESERVED
UART_TX
UART_RX
GND
GPIO13
GPIO12
GND
VDD
GPIO11
GPIO10
NC
NC
NC
NC
NC
GND
GND
GND
RF
GND
NC
GND
GND
GND
NC
PGC_INT
PGD_INT
RESET
GND
VDD
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GND
NC
GPIO6
DS50002390E-page 4
2015-2018 Microchip Technology Inc.
RN2903
TABLE 1-1:
Pin
44
45
46
47
GPIO7
GPIO8
GPIO9
GND
PIN DESCRIPTION (CONTINUED)
Name
Type
Input/Output
Input/Output
Input/Output
Power
Description
General purpose I/O pin or analog input
General purpose I/O pin or analog input
General purpose I/O pin or analog input
Ground supply terminal
Note 1:
Optional handshake lines are supported in future firmware releases.
2015-2018 Microchip Technology Inc.
DS50002390E-page 5
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