Microchip Technology RN2903 Bedienungsanleitung

2015 Microchip Technology Inc. Advance Information DS00000A-page 1

RN2903

General Features

• On-board LoRaWAN™ Class A protocol stack

• ASCII command interface over UART

• Compact form factor: 17.8 x 26.7 x 3 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” DS40000000A)

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 -148 dBm

• TX Power: adjustable up to +20 dBm high

efficiency PA

• FSK, GFSK, and LoRa Technology modulation

• IIP3 = -11 dBm

• >15 km coverage at suburban and >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

• Internet of Things (IoT)

Low-Power Long Range LoRa™ Technology

Transceiver Module

RN2903

DS00000A-page 2 Advance Information 2015 Microchip Technology Inc.

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................................................................................................................................................................... 12

Appendix A: Revision History............................................................................................................................................................... 17

The Microchip Web Site....................................................................................................................................................................... 19

Customer Change Notification Service................................................................................................................................................ 19

Customer Support................................................................................................................................................................................ 19

Product Identification System............................................................................................................................................................... 21

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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:

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

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

GND

UART_RTS

UART_CTS

RESERVED

UART_TX

UART_RX

GND

GPIO13

GPIO12

GND

VDD

GPIO11

GPIO10

GND

VDD

GND

TEST0

TEST1

RESET

GPIO0

GPIO1

GPIO2

GPIO3

GPIO4

GPIO5

GPIO6

GPIO7

GPIO8

GPIO9

User Hardware:

Status LEDs, switches, logic IOs, etc.

RN2903 Module

MCU

LoRaTM

Technology radio

Command Processor

14 GPIO Pins Real Time

Clock

LoRaWANTM Protocol Stack

I2CTM SPI

UART

32768 Hz

Crystal

EUI-64

EEPROM

Host MCU

Antenna

915 MHz

RN2903

DS00000A-page 4 Advance Information 2015 Microchip Technology Inc.

Table 1-1 describes the module’s pins.

TABLE 1-1: PIN DESCRIPTION

Pin Name Type Description

1 GND Power Ground supply terminal

2 UART_RTS Output Communication UART RTS signal(1)

3 UART_CTS Input Communication UART CTS signal(1)

4 RESERVED — Do not connect

5 RESERVED — Do not connect

6 UART_TX Output Communication UART Transmit (TX)

7 UART_RX Input Communication UART Receive (RX)

8 GND Power Ground supply terminal

9 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

2015 Microchip Technology Inc. Advance Information DS00000A-page 5

RN2903

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.

TABLE 1-1: PIN DESCRIPTION (CONTINUED)

Pin Name Type Description

RN2903

DS00000A-page 6 Advance Information 2015 Microchip Technology Inc.

2.0 GENERAL SPECIFICATIONS

Table 2-1 provides the general specifications for the module. Table 2-2 and Table 2-3 provide the module's electrical

characteristics and current consumption. Table 2-4 and Table 2-5 show the module's dimensions and 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 >15 km coverage at suburban; >5 km coverage at urban area

Sensitivity at 0.1% BER -148 dBm(1)

RF TX Power Adjustable up to max. 20 dBm on 915 MHz band(2)

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” (DS40000000A).

TABLE 2-2: ELECTRICAL CHARACTERISTICS

Parameter Min. Typ. Max. Units

Supply Voltage 2.1 — 3.6 V

Voltage on any pin with respect to VSS (except VDD) -0.3 — VDD + 0.3 V

Voltage on VDD with respect to VSS -0.3 — 3.9 V

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 — — V

VDD Start Voltage to ensure internal Power-on Reset signal — — 0.7 V

VDD Rise Rate to ensure internal Power-on Reset signal 0.05 — — V/ms

Brown-out Reset Voltage 1.75 1.9 2.05 V

Logic Input Low Voltage — — 0.15 x VDD V

Logic Input High Voltage 0.8 x VDD — — V

Input Leakage at <25°C

(VSS<VPIN<VDD, Pin at high-impedance) —0.150nA

Input Leakage at +60°C

(VSS<VPIN<VDD, Pin at high-impedance) —0.7100nA

Input Leakage at +85°C

(VSS<VPIN<VDD, Pin at high-impedance) —4200nA

RF Input Level — — +10 dBm

2015 Microchip Technology Inc. Advance Information DS00000A-page 7

RN2903

TABLE 2-3: CURRENT CONSUMPTION

Mode Typical Current at 3V (mA)

Idle 2.7

RX 13.5

Deep Sleep 0.022

TABLE 2-4: MODULE DIMENSIONS

Parameter Value

Dimensions 17.8 x 26.7 x 3 mm

Weight 2.05g

TABLE 2-5: OUTPUT POWER OF TX

POWER SETTING

TX Power

Setting Output Power

(dBm)

TypicalSupply

Current at 3V

(mA)

23.042.6

34.044.8

45.047.3

56.049.6

67.052.0

78.055.0

89.057.7

910.061.0

10 11.0 64.8

11 12.0 73.1

12 13.0 78.0

14 14.7 83.0

15 15.5 88.0

16 16.3 95.8

17 17.0 103.6

20 18.5 124.4

RN2903

DS00000A-page 8 Advance Information 2015 Microchip Technology Inc.

3.0 TYPICAL HARDWARE CONNECTIONS

Figure 3-1 shows the typical hardware connections.

FIGURE 3-1: HARDWARE CONNECTIONS

3.1 INTERFACE TO HOST MCU

The RN2903 module has a dedicated UART interface

to communicate with a host controller. Optional

handshake lines are supported in future firmware

releases. The “RN2903 LoRa™ Technology Module

Command Reference User’s Guide” (DS40000000A)

provides a detailed UART command description.

Table 3-1 shows the default settings for the UART

communication.

3.2 GPIO PINS (GPIO1–GPIO14)

The module has 14 GPIO pins. These lines can be

connected to switches, LEDs, and relay outputs. The

pins are either logic inputs or outputs that can be

accessed via the module firmware. These pins have

limited sink and source capabilities. The current

firmware release only supports output function on all

GPIOs. Electrical characteristics are described in

Table 2-2.

3.3 RF CONNECTION

When routing RF path, use proper strip lines with an

impedance of 50 Ohm.

3.4 RESET PIN

The module’s reset pin is an active-low logic input.

3.5 POWER PINS

It is recommended to connect power pins (Pin 12 and

34) to a stable supply voltage with sufficient source

current. Table 2-2 shows the current consumption.

Additional filtering capacitors are not required but can

be used to ensure stable supply voltage in noisy

environment.

RN2903

GPIOsHost MCU

TXRX

CTS(1) RTS

RTS(1) CTS

RFH

915 MHz band

UART

Status LEDs,

switches,

logic IOs,

etc.

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

TABLE 3-1: DEFAULT UART SETTINGS

Specification Description

Baud Rate 57600 bps

Packet Length 8 bit

Parity Bit No

Stop Bits 1 bit

Hardware Flow Control No

2015 Microchip Technology Inc. Advance Information DS00000A-page 9

RN2903

4.0 PHYSICAL DIMENSIONS

Figure 4-1 and Figure 4-2 illustrate the physical dimensions and the recommended PCB layout for the RN2903 module.

FIGURE 4-1: RN2903 PHYSICAL DIMENSIONS

FIGURE 4-2: RECOMMENDED PCB FOOTPRINT

Note: Host PCB top layer copper traces must have solder mask to avoid shorting test pins on the bottom of the module.

RN2903

DS00000A-page 10 Advance Information 2015 Microchip Technology Inc.

5.0 APPLICATION INFORMATION

5.1 RF pins and strip line

The RF signals must be routed with properly terminated 50 Ohm strip lines. Use curves instead of sharp corners. Keep

the routing path as short as possible. Figure 5.3 shows a routing example.

FIGURE 5-1: RF ROUTING (EXAMPLE)

5.2 Approved Antennas

Modular certification of the RN2903 module was per-

formed with the external antenna type mentioned in

Table 5-1. Refer to Section 6.0 "Regulatory

Approval" for specific regulatory requirements by

country.

TABLE 5-1: TESTED EXTERNAL

ANTENNA TYPES

Type Gain (dBi)

Dipole 6

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