Microchip Technology LG9271 User Manual

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LG8271/LG9271

Low-Power Long Range (LoRa®) Technology Gateway

Module for US (LG9271) and EU (LG8271)

General Features

• Supports LoRa®/LoraWAN™ Technology RF Packets

• Up to eight receive and one transmit channel(s)

• UART (TTL) interface with built-in control protocol

• Compact form factor 90.0 mm x 30.0 mm

• mPCIe physical connector

• Environmentally friendly RoHS compliant

• Compliance:

- LG8271: Certified to R&TTE RF Standards

- LG9271: Certified to FCC Modular Transmit-

ter Standards

• Device Firmware Upgrade (DFU) over UART, see

Technology Gateway Module Software

“LoRa Specifications”

Operational

• Single operating voltage: 3.0V to 3.6V (3.3V nominal)

• Temperature range: -40 to +85 °C

• Supports LoRa Technology (12.5 kbps) and FSK (EU only) (up to 300 kbps) modulations

• Integrated frequency matched RF front end, RF transceiver, baseband processor, and MCU

The multi-channel, flexible nature of these modules makes them ideal for use in LoRa Technology gateway applications.

The advanced command protocol available over the UART interface provides complete control over the full capabilities of RF subsystem in addition to packet reception and transmission.

Applications

Applications deploying LoRa Technology where gateway devices are required include:

• Automated Meter Reading

• Home and Building Automation

• Wireless Alarm and Security Systems

• Industrial Monitoring and Control

• Machine to Machine (M2M)

• Internet of Things (IoT)

Description

Microchip's LG8271/LG9271 Low-Power Long Range (LoRa) Technology transceiver modules provide an easy to use, low-power solution for long range wireless data reception. Each module provides eight LoRa Technology receive channels (125 kHz Bandwith (BW)). In addition to the eight LoRa Technology receive channels, the modules provide two additional receive channels. The first is a LoRa Technology modulation receive channel capable of 125, 250 or 500 kHz BW). The second provides an FSK/GFSK (EU only) receive channel.

Beyond its receiver capability, the modules provide a single flexibly transmit channel. This transmit channel is capable of both LoRa Technology and FSK/GFSK modulations at multiple bandwidths (LoRa Technology) or baud rates (FSK/GFSK).

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LG8271/LG9271

Table of Contents

Device Overview ................................................................................................................................................................................... 3

General Specifications .......................................................................................................................................................................... 7

Typical Hardware Connections ............................................................................................................................................................11

Application Information ........................................................................................................................................................................ 13

Regulatory Approval ............................................................................................................................................................................ 15

Appendix A: Revision History .............................................................................................................................................................. 19

The Microchip Web Site ...................................................................................................................................................................... 21

Customer Change Notification Service ............................................................................................................................................... 21

Customer Support ............................................................................................................................................................................... 21

Product Identification System .............................................................................................................................................................. 22

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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

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LG8271/LG9271

1.0 DEVICE OVERVIEW

The LG8271/LG9271 transceiver modules feature LoRa Technology RF modulation, which provides long range spread spectrum communication with high interference immunity.

Each module supports eight (8) receive channels allowing it to receive up to eight LoRa Technology modulated packets simultaneously. By using LoRa Technology modulation technique, LG8271/LG9271 can achieve a receiver sensitivity of -146 dBm. When combined with LoRa Technology transmission devices, the LG8271/LG9271 can provide a system with industry leading link budget, which makes it optimal for applications requiring extended range and robustness.

The LG8271/LG9271 modules also contain an integrated output power amplifier (LNA) providing optimal downlink signal levels.

FIGURE 1-2: PIN DIAGRAM

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 LG8271/LG9271 modules deliver exceptional RF selectivity and their multi-channel performance make them ideal for use in LoRa Technology gateway applications.

Figure 1-1, Figure 1-2 and Figure 1-3 show the top and

bottom view, the pinout, and the block diagram of the modules.

FIGURE 1-1: TOP VIEW

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LG8271/LG9271

PIC24FJ128GB204

LoRaBaseband

Semtech

SX1301

RFESX1257

RF

Switch,

PA/ LNA

RFE,etc.

FIGURE 1-3: BLOCK DIAGRAM

Debug

SPI

I/Q

UART

24LC08B

EEPROM

Table 1-1 describes the pins of the module.

TABLE 1-1: PIN DESCRIPTION

Pin Symbol Type Description

1 NC — Not Connected 2 VDD Power Positive Supply Terminal 3 HOST_INT Output Interrupt to the Host CPU 4 GND Power Ground Supply Terminal 5 PPS Input GPS PPS Input signal 6 NC — Not Connected 7 NC — Not Connected 8 NC — Not Connected

9 GND Power Ground Supply Terminal 10 NC — Not Connected 11 NC — Not Connected 12 NC — Not Connected 13 NC — Not Connected 14 NC — Not Connected 15 GND Power Ground Supply Terminal 16 NC — Not Connected 17 HOST_URX Input Module UART Receive 18 GND Power Ground Supply Terminal 19 HOST_UTX Output Module UART Transmit 20 RF_ENABLE Input RF Enable Input 21 GND Power Ground Supply Terminal 22 RESET Input Reset Module 23 NC — Not Connected 24 VDD Power Positive Supply Terminal 25 NC — Not Connected 26 GND Power Ground Supply Terminal 27 GND Power Ground Supply Terminal 28 NC — Not Connected

I/Q

DS00000000A-page 4 Preliminary  2017 Microchip Technology Inc.

TABLE 1-1: PIN DESCRIPTION (CONTINUED)

Pin Symbol Type Description

29 GND Power Ground Supply Terminal 30 HOST_CLK Input Host I 31 NC — Not Connected 32 HOS_SDA Input/Output HOST I 33 NC — Not Connected 34 GND Power Ground Supply Terminal 35 GND Power Ground Supply Terminal 36 USB_D- — Host USB D37 GND Power Ground Supply Terminal 38 USB_D+ — Host USB D+ 39 VDD Power Positive Supply Terminal 40 GND Power Ground Supply Terminal 41 VDD Power Positive Supply Terminal 42 LED1 Output LED1 Output 43 GND Power Ground Supply Terminal 44 LED2 Output LED2 Output 45 HOST_MISO Ouput Module SPI Slave Output 46 LED3 Output LED3 Output 47 HOST_MISO Input Module SPI Slave Input 48 PIC_DETECT Input/Output PCI Bus Detect Input.

49 HOST_SS Input Module SPI Slave Select Input 50 GND Power Ground Supply Terminal 51 HOST_SCK Input Module SPI Clock Input 52 VDD Power Positive Supply Terminal

LG8271/LG9271

C Clock

C Data

Low = SPI Mode, High = mPCIe/UART

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LG8271/LG9271

NOTES:

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LG8271/LG9271

2.0 GENERAL SPECIFICATIONS

Table 2-1 provide the general specifications for the module. Table 2-2 through Ta b le 2 -4 provide the electrical charac-

teristics, RF receiver charactersitics, LoRa Technology data rate and sensitivity versus spreading factor.

TABLE 2-1: GENERAL SPECIFICATION

Specification Description

Frequency Band - LG9271 902.000 MHz to 928.000 MHz Frequency Band - LG8271 863.000 MHz to 870.000 MHz Modulation Method FSK (EU only), GFSK (EU only), and LoRa

modulation

Maximum Over-the-Air Data Rate 200 kbps (FSK);

21875 bps (LoRa Technology, see Tab l e 2- 4 ) RF Connection On-board U.FL connector Interface UART (TTL) Operation Range Up to 15 km coverage at suburban; up to 5 km coverage at

urban area RF TX Power - LG9271 Adjustable, < +18.5 dBm RF TX Power - LG8271 Adjustable, < +14.0 dBm Generated Conductive Harmonics Level Below -70 dBm Temperature (operating) -40°C to +85°C Temperature (storage) -40°C to +115°C Humidity 10% ~ 90% Non-condensing

Note 1: Depends on modulation and Expand Spreading Factor (SF)

2: TX power is adjustable. For more information, refer to the “LoRa

Specifications”

(2) (2)

Technology Gateway Module Software

Technology

(1)

TABLE 2-2: ELECTRICAL CHARACTERISTICS

Parameter Min. Typ. Max. Units

Supply Voltage 3.0 — 3.6 V Voltage on any pin with respect to VSS (except

VDD) 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) 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) VDD Start Voltage to ensure internal Power-on

Reset signal VDD Rise Rate to ensure internal Power-on

Reset signal 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)

-0.3 — -VDD + 0.3 V

——+/-20mA

1.5 — — V

——0.7V

0.05 — — V/ms

— 0.1 50 nA

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LG8271/LG9271

TABLE 2-2: ELECTRICAL CHARACTERISTICS (CONTINUED)

Parameter Min. Typ. Max. Units

Input Leakage at +60°C (VSS<VPIN<VDD, Pin at high-impedance)

RF Input Level — 0 +6 dBm

TABLE 2-3: RF RECEIVER CHARACTERISTICS

Descriptions Conditions Typ Unit

LoRa Technology sensitivity at SF12 : IF8 path

LoRa Technology sensitivity at SF12 : IF0 to 7 paths

Receiver CW interferer rejection at 1Mhz offset at SF12

Co-channel rejection at SF12 Wanted signal 10 dB

LoRa Technology sensitivity at SF7 : IF8 path

LoRa Technology sensitivity at SF7 : IF0 to 7 paths

Receiver CW interferer rejection at 1 Mhz offset

Co-channel rejection at SF7 Wanted signal 10 dB

FSK sensitivity FDev = 50 kHz,

Bit rate FSK Frequency deviation (FDev), FSK Programmable 0.6 to 200 kHz

Note 1: Bit rate limited by: FDev + Bit Rate/2 < 250 kHz

(1)

BW = 125 kHz BW = 250 kHz BW = 500 kHz

BW = 125 kHz -140 dBm

BW = 125 kHz +80 dB

above sensitivity

BW = 125 kHz BW = 250 kHz BW = 500 kHz

BW = 125 kHz -126 dBm

BW = 125 kHz +70 dB

above sensitivity

Bit Rate = 100 kb/s

Programmable 1.2 to 100 kbps

—0.7100nA

-140

-137

-134

+25 dB

-126

-123

-120

+9 dB

-103 dBm

dBm

TABLE 2-4: LoRa TECHNOLOGY DATA RATE (BPS) AND SENSITIVITY VERSUS SPREADING

FACTOR (SF)

125 kHz 250 kHz

Data Rate Sensitivity Data Rate Sensitivity Data Rate Sensitivity

7 5496 -130.0 10938 -127.0 21875 -124.0 8 2125 -132.5 6250 -129.5 12500 -126.5

9 1758 -135.0 3516 -132.0 7031 -129.0 10 977 -137.5 1953 -134.5 3906 -131.5 11 537 -140.0 1074 -137.0 2148 -134.0 12 293 -142.5 586 -139.5 1172 -136.5

Note 1: 250 kHz and 500 kHz LoRa Technology bandwidths are available only on IF8.

DS00000000A-page 8 Preliminary  2017 Microchip Technology Inc.

(1)

500 kHz

(1)

+ 16 hidden pages

Microchip Technology LG9271 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.0 DEVICE OVERVIEW

FIGURE 1-2: PIN DIAGRAM

FIGURE 1-1: TOP VIEW

FIGURE 1-3: BLOCK DIAGRAM

TABLE 1-1: PIN DESCRIPTION

2.0 GENERAL SPECIFICATIONS

TABLE 2-1: GENERAL SPECIFICATION

TABLE 2-2: ELECTRICAL CHARACTERISTICS

TABLE 2-3: RF RECEIVER CHARACTERISTICS