DLP-RFS1280
2.4GHz DATA RADIO
** PRELIMINARY DOCUMENT-SUBJECT TO CHANGE **
FEATURES:
2.40GHz-2.48GHz Operation
+11.5dBm Output Power
4+ Mile Range (Line of Sight)
U.FL Antenna Connector for External Antenna
LORA, GFSK and FLRC Modulation Modes
On-Board Chip Antenna
FCC/IC/RED/MIC (Japan) Modular Approvals in Place
Single 3.3-Volt Power Supply
Development Kit Available
Demonstration Source Code Available for Use with the NUCLEO-L073RZ microcontroller
development board (purchased separately)
APPLICATION AREAS:
Real-Time Security
Body-Worn Medical Telemetry
Battery-Powered Home Automation
Electric/Water/Gas Automated Meter Reading
Industrial Monitoring and Control
Active RFID
Long Range, Battery-Powered, Multi-Hop Sensor Networks
1.0 INTRODUCTION
The DLP-RFS1280 is a low-cost module for transmitting and receiving digital data via radio frequency.
All of the DLP-RFS1280’s electronics (including an antenna) reside on a single PCB, and all
operational power is derived from a single supply voltage.
The transceiver design consists of a Semtech SX1280 low-power, integrated UHF transceiver and an
antenna switch for selecting between the on-board chip antenna and an optional external antenna.
The hardware is designed for maximum range and optimal battery life.
Rev 1.7 (April 2018)
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DLP Design, Inc.
2.0 ELECTRICAL SPECIFICATIONS
Supply Voltage
Frequency Range
Output Power
TX/RX Range
Protocol
Communications Interface
Operational Power – Transmit
Operational Power – Receive
Operational Power – Sleep
Antenna Connector
Operating Temperature
1.8-3.7V
2.402-2.48GHz
14mW (+11.5dBm) Maximum (Conducted)
Greater than 5 Miles (Antenna-Type Dependent)
Multiple
SPI
24mA
4.8mA-5.6mA Depending Upon the Operating Mode
8uA (Deepest Sleep Mode)
u.fl*
0-70°C
*Please see the Antenna Section for important regulatory details.
3.0 IO PINS
IO Pin Definitions
GROUND
1
NRESET
2
BUSY
3
DIO1
4
DIO2
5
DIO3
6
MISO_TX
7
GROUND
8
3.3V POWER SUPPLY
9
10
MOSI_RX
11
SCK_RTSN
12
NSS_CTS
13
ANTSEL
14
GROUND
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DLP Design, Inc.
4.0 MECHANICAL
4.1 MECHANICAL DRAWING - Overall Dimensions: 0.8 x 0.92 x 0.135 In.
Note: thou = mils or 0.001 inches.
4.2 MOUNTING OPTIONS
The DLP-RFS1280 module can be either surface mounted to a printed circuit board or connected
using 0.1-inch spaced headers (0.025 sq.-inch posts).
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DLP Design, Inc.
5.0 APPLICATION DEVELOPMENT
Demonstration source code written in the C programming language is available for free download
upon purchase of the DLP-RFS1280 or DLP-RFS1280ACT demonstration platform. The code was
developed using MBED and Keil uVision for the STMicrocontroller Nucleo microcontroller
development module.
Source code for the demonstration software has been developed for the STM32L073RZ-based
Nucleo board. Compiling the L073 source code may require the user to purchase the Keil compiler.
Additional information on the operation of the Semtech SX1280 transceiver IC is available in the
datasheet for the SX1280.
6.0 DEMONSTRATION HARDWARE - EDK
This section describes how to operate the DLP-RFS1280ACT demonstration hardware (purchased
separately). The DLP-RFS1280ACT includes a DLP-RFS1280 transceiver module that allows the
user to easily verify normal operation of the transceiver and assists in helping them become familiar
with the operational firmware.
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DLP Design, Inc.
Note: Flow diagrams for the demonstration code can be found at the end of this datasheet. Source
code for the demonstration EDK is made available upon purchase of the DLP-RFS1280 or
DLP-RFS1280ACT.
Power for this test platform can be provided by a phone charger battery (purchased separately) or a
PC USB port using the included USB cable. The USB connector is a 5-pin, mini-USB connector.
For normal mode, press the RESET button. The system will be in Receive Mode waiting for packets
to arrive. After each mode listed below, press RESET to return to idle state before proceeding to the
next test mode.
6.1 TEST MODE:
6.1.1
For Carrier Wave (CW) Mode - No Modulation
Press Button 1 until LORA Mode is selected:
Press and hold Button 1. While holding Button 1, press and release RESET. Continue to
hold Button 1 until you hear a beep. Release Button 1, and the system will be transmitting at 2.4GHz
on the internal chip antenna with no modulation.
- Be sure to turn the volume up (blue knob next to the speaker) if you cannot hear the beep.
- You can change to the external antenna by pressing Button 2 (ANT SEL). The display will show
either a “C” for chip antenna or a “W” for whip antenna.
- You can change the carrier frequency to 2.44GHz by pressing Button 5 (LMH). Repeatedly pressing
the LMH button will cycle through low (2.41GHz), medium (2.44GHz) and high (2.48GHz) carrier
frequencies.
6.1.2
6.2 TEST MODE:
6.2.1
For CW Mode - With Modulation - LORA Mode
Press Button 1 until LORA Mode is selected:
Press and hold Button 3. While holding Button 3, press and release RESET. Continue to hold
Button 3 until you hear a beep. Release Button 3 and the system will be transmitting at 2.4GHz on
the internal chip antenna with LORA modulation.
6.2.2
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DLP Design, Inc.
