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RN2903 Schematic ( PDF Datasheet ) - Microchip

Teilenummer RN2903
Beschreibung Transceiver Module
Hersteller Microchip
Logo Microchip Logo 




Gesamt 24 Seiten
RN2903 Datasheet, Funktion
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
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
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 (M2M)
• Internet of Things (IoT)
2015 Microchip Technology Inc.
DS50002390B-page 1






RN2903 Datasheet, Funktion
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
Modulation Method
902.000 MHz to 928.000 MHz
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
Sensitivity at 0.1% BER
RF TX Power
Up to 15 km coverage at suburban; up to 5 km coverage at urban area
-146 dBm(1)
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
Voltage on any pin with respect to VSS (except VDD)
Voltage on VDD with respect to VSS
Input Clamp Current (IIK) (VI < 0 or VI > VDD)
Output Camp Current (IOK) (VO < 0 or VO > VDD)
GPIO sink/source current each
Total GPIO sink/source current
RAM Data Retention Voltage (in Sleep mode or Reset state)
VDD Start Voltage to ensure internal Power-on Reset signal
VDD Rise Rate to ensure internal Power-on Reset signal
Brown-out Reset Voltage
Logic Input Low Voltage
Logic Input High Voltage
Input Leakage at <25°C
(VSS<VPIN<VDD, Pin at high-impedance)
Input Leakage at +60°C
(VSS<VPIN<VDD, Pin at high-impedance)
Input Leakage at +85°C
(VSS<VPIN<VDD, Pin at high-impedance)
RF Input Level
Min.
2.1
-0.3
-0.3
1.5
0.05
1.75
0.8 x VDD
Typ.
1.9
0.1
0.7
4
Max.
3.6
VDD + 0.3
3.9
+/-20
+/-20
25/25
200/185
0.7
2.05
0.15 x VDD
50
100
200
+10
Units
V
V
V
mA
mA
mA
mA
V
V
V/ms
V
V
V
nA
nA
nA
dBm
DS50002390B-page 6
2015 Microchip Technology Inc.

6 Page









RN2903 pdf, datenblatt
5.3 APPLICATION SCHEMATIC
Figure 5-3 shows the schematic for the RN2903 PICtail™/PICtail Plus Daughter Board.
FIGURE 5-3:
PICTAIL™/PICTAIL PLUS DAUGHTER BOARD SCHEMATIC
TEST
1
2
3
4
5
6
+3V3
GND
J2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
+3V3_ext2
GP0
GP1
GP2
GP3
GP4
GP5
GP6
GP7
GP8
GP9
Socket 1.27 mm
+3V3 +3V3_M
JP1 JP2
0R 0603 0R 0603
28 GND
29 NC
30 TEST0
31 TEST1
32 RESET
33 GND
34 VDD
35 GPIO0
36 GPIO1
37 GPIO2
38 GPIO3
39 GPIO4
40 GPIO5
41 GND
42 NC
43 GPIO6
44 GPIO7
45 GPIO8
46 GPIO9
47 GND
GND
U1
RN2903
R4
220
1%
0603
GND
+3V3
50 Ohm
i
RFH
SMA
GND
Current measure points
GND
+3V3_M
CUR1
+3V3
GND
CUR2
R1
1
1%
0603
USB
GNDID D+ D-+5V
5 4X 3 2 1
IC1
+3V3_M +3V3
+3V3
MCP1825-3302E/DC
D1
B0520LW-7-F
GND
GND
GND 20
NC 19
NC 18
NC 17
NC 16
NC 15
GPIO10 14
GPIO11 13
VDD 12
GND 11
GPIO12 10
GPIO13 9
GND 8
UART_RX 7
UART_TX 6
RESERVED 5
RESERVED 4
UART_CTS 3
UART_RTS 2
GND 1
JP3 JP4
0R 0603 0R 0603
GP10
GP11
+3V3_ext1
GP12
GP13
Module_RX
Module_TX
Module_CTS
Module_RTS
J1
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Socket 1.27 mm
GND
R5
220
1%
0603 Module_CTS
R6
Module_RX
Module_TX
C2
470nF
25V
0603
C1
1uF
25V
0603
4 Vout Vin 2
5 Pgd EN 1
+5V_D
C3
1uF
25V
0603
GND GND
GND
GND
USB_DET
+5V_USB
R2
C4
100nF
25V
0603
C5
10uF
6.3V
0603
C6
10nF
50V
0603
1.5k
1%
0603
R3
2.7k
1%
0603
GND GND
GND GND
IC2
PIC18LF25K50-I/ML
USB_D-
USB_D+
13 D+
RA0/AN0/C12IN0- 27
12 D-
RA1/AN1/C12IN1- 28
+3V3
RA2/AN2/C2IN+/Vref- 1
RA3/AN3/C1IN+/VREF+ 2
11 VUSB
RA4/C1OUT/SRQ/T0CKI 3
17 Vdd
RA5/AN4/C2OUT/SRNQ/HLVDIN/SS 4
C8
4.7uF
RA6/OSC2/CLKO 7
6.3V
0603
RA7/OSC1/CLKI 6
5,16 Vss
29 EP
RB0/AN12/SRI/FLT0/SDI/SDA/INT0 18
RB1/AN10/C12IN3-/P1C/SCK/SCL/INT1 19
GND
RB2/AN8/CTED1/P1B/INT2 20
RB3/AN9/C12IN2-/CTED2/CCP2/SDO 21
8 RC0/SOSCO/T1CKI/T3CKI/T3G/IOCC0 RB4/AN11/P1D/IOCB4 22
9 RC1/CCP2/SOSCI/IOCC1
RB5/AN13/T1G/T3CKI/IOCB5 23
10 RC2/AN14/CTPLS/CCP1/P1A/IOCC2
RB6/IOCB6/PGC 24
14 RC6/AN18/TX/CK/IOCC6
RB7/IOCB7/PGD 25
15 RC7/RX/DT/SDO/IOCC7
MCLR/VPP/RE3 26
ICSP_IC2
Pin 2.54 mm
+3V3
GND
R10
220
1%
0603
R9
220
1%
0603
R7
100
1%
0603
220
1%
0603 Module_RX
Module_CTS
+3V3
LD2
Green
LD1
Green
GND
Module_RTS
JP_RST
R8
4.7k
1%
0603
PT+_SENSE
IC2_MCLR
Insert a short on this jumper to keep IC2 in reset state
while plugged in PICtail Plus socket
PICTail Plus
GND
+3V3
+3V3
PICTail
Pin 2.54 mm right angle (PBC14DBDN)
GND
Note: Shaded components are not populated by default.

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