DRF1272F
DRF1272F
20dBm LoRa Long Range RF Front-end Module V1.01
Features:
Frequency Range: 868MHz
Modulation: FSK/GFSK/MSK/LoRa
SPI Data Interface
Sensitivity: -137dBm
Output Power: +20dBm
Data Rate: <300 kbps
127dB dynamic Range RSSI
Excellent blocking immunity
Preamble detection
Automatic RF sense and CAD monitor Applications
Built-in bit synchronizer for clock recovery
Remote Control
Packet engine up to 256 bytes with CRC
Smart metering
Working Temperature: -40°C ~+80°C
Home Automation
Build-in temperature sensor
Personal data logger
Standby current: ≤ 1uA
Wireless sensor network
Supply voltage: 1.8~3.6V
Remote keyless entry
Wireless PC peripherals
DESCRIPTION
DRF1272F is a type of low cost RF front-end transceiver module based on SX1272 from Semtech
Corporation. It keeps the advantages of RFIC SX1272 but simplifies the circuit design. The high
sensitivity (-137dBm) in LoRa modulation and 20dBm high power output make the module
suitable for low range and low data rate applications.
DRF1272F module consists of RFIC SX1272, thin SMD crystal and antenna matching circuit. The
antenna port is well matched to standard 50 Ohm impedance. Users don’t need to spend time in
RF circuit design and choose suitable antennas for different applications. DRF1272F operates at
1.8~3.6V with extra low standby current which makes it suitable for battery powered-up
applications. Because DRF1272F is purely hardware module and it adopts ±10ppm crystal which
the resolution of it places a important role in calculating spreading factor, bandwidth, etc. Users
need to read the datasheet of SX1272 carefully in order to use the module in the best performance.
Revision 1.01 Page 1 of 6 Aug. 2015
DRF1272F
DORJI also provides sample codes based on microcontroller and Arduino platform. The
customers who buy the modules can contact the sales of DORJI for modifiable copies.
PIN FUNCTIONS
`
Figure 1: DRF1272F Pin Layout
PIN Name Function Description
1 RESET Input Reset
2 DIO0 Input/Output Digital I/O
3 DIO1 Input/Output Digital I/O
4 DIO2 Input/Output Digital I/O
5 DIO3 Input/Output Digital I/O
6 DIO4 Input/Output Digital I/O
7 DIO5 Input/Output Digital I/O
8 VCC Power Normal 3.3V
9 GND Ground Ground (0V)
10 SCK Input SPI clock input
11 MISO Input SPI data output
12 MOSI Input SPI data input
13 NSS Output SPI chip select input
14 GND Ground Ground (0V)
15 ANT Ground 50 Ohm Impedance
Table 1: DRF1272F Pin Functions
Revision 1.01 Page 2 of 6 Aug. 2015
DRF1272F
ELECTRICAL SPECIFICATIONS
Symbol Parameter (condition) Min. Typ. Max. Units
VCC Supply Voltage 1.8 3.7 V
Temp Operating temperature range -40 25 80 °C
Freq Frequency range 860 869 890 MHz
IDD_R Current in receive mode 12 mA
IDD_T Current in transmit mode 125 mA
IDD_S Current in sleep mode. 1 uA
Pout Max. output power 20 dBm
Sen Receiver sensitivity @LoRa 300bps -137 dBm
ZANT Antenna Impedance 50 Ohm
Table 2: DRF1272F Electrical Specifications
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Min. Max. Units
VCC Supply Voltage -0.3 3.7 V
VI Input voltage -0.3 VCC+0.3 V
VO Output voltage -0.3 VCC+0.3 V
TST Storage temperature -55 125 °C
Table 3: DRF1272F Maximum Ratings
Revision 1.01 Page 3 of 6 Aug. 2015
DRF1272F
APPLICATION CIRCUIT
Figure 2: Application Circuit
Revision 1.01 Page 4 of 6 Aug. 2015
DRF1272F
MECHANICAL DATA
Unit: mm
0.80
2.10
17.00
1.27
17.00
17.00
1.27
0.90
0.80
Figure 3: Mechanical Dimension
REFERENCE DOCUMENTS
1. SX1272 Datasheet
2. LoRa Calculator
3. LoRa Low Energy Design Guide
4. LoRa Modem Designer's Guide
5. SX1276 Development Kit User Guide
Revision 1.01 Page 5 of 6 Aug. 2015
DRF1272F
Dorji Industrial Group Co., Ltd reserves the right to
make corrections, modifications, improvements and
other changes to its products and services at any time
orji Applied Technologies and to discontinue any product or service without
A division of Dorji Industrial Group Co., Ltd notice. Customers are expected to visit websites for
getting newest product information before placing
Add.: Xinchenhuayuan 2, Dalangnanlu, Longhua, orders.
Baoan district, Shenzhen, China 518109
Tel: 0086-755-28156122 These products are not designed for use in life support
Fax.: 0086-755-28156133 appliances, devices or other products where
Email: sales@dorji.com malfunction of these products might result in personal
Web: http://www.dorji.com injury. Customers using these products in such
applications do so at their own risk and agree to fully
indemnify Dorji Industrial Group for any damages
resulting from improper use.
Revision 1.01 Page 6 of 6 Aug. 2015
