User's Guide
2015 Microchip Technology Inc. Advance Information DS00000A-page 3
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 -148 dBm.
The high sensitivity combined with the integrated
+20 dBm power amplifier yields industry leading link
budget, which makes it optimal for applications
requiring extended range and robustness.
FIGURE 1-1: RN2903 TOP VIEW
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. Figure 1-1, Figure 1-2, and
Figure 1-3 show the module’s top view, the pinout, and
the block diagram.
FIGURE 1-2: RN2903 PIN DIAGRAM
FIGURE 1-3: RN2903 BLOCK DIAGRAM
1
GND
2
UART_RTS
3
UART_CTS
4
RESERVED
5
RESERVED
6
UART_TX
7
UART_RX
8
GND
GND
9
GPIO13
10
GPIO12
11
GND
20
GND
12
VDD
13
GPIO11
14
GPIO10
15
NC
16
NC
17
NC
18
NC
19
NC
40
39
38
37
36
35
34
33
32
31
30
21
29
28
27
26
25
24
23
22
GND
GND
GND
GND
GND
GND
RF
NC
VDD
GND
47
46
45
44
43
42
41
GND
NC
TEST0
TEST1
RESET
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
GPIO8
GPIO9
NC
User Hardware:
Status LEDs, switches, logic IOs, etc.
RN2903 Module
MCU
LoRa
TM
Technology radio
Command Processor
14 GPIO Pins
Real Time
Clock
LoRaWAN
TM
Protocol Stack
I
2
C
TM
SPI
UART
32768 Hz
Crystal
EUI-64
EEPROM
Host MCU
Antenna
915 MHz