User Manual
2/13/2018 Lora Sensor Node-LSN50 - Wiki for Dragino Project
http://wiki.dragino.com/index.php?title=Lora_Sensor_Node-LSN50 3/17
Specifications
MCU Side:
MCU: STM32L072CZT6
Flash:192KB
RAM:20KB
EEPROM: 6KB
Clock Speed: 32Mhz
LoRa Side:
LoRa Chip: sx1276/sx1278
68 dB maximum link budget.
+20 dBm - 100 mW constant RF output vs.
+14 dBm high efficiency PA.
Programmable bit rate up to 300 kbps.
High sensitivity: down to -148 dBm.
Bullet-proof front end: IIP3 = -12.5 dBm.
127 dB Dynamic Range RSSI.
LoRaWAN 1.0.2 Specification
Absolute Maximum Ratings:
I/O pins: 0.5v ~ VCC+0.5V
Common DC Characteristics:
Supply Voltage: 2.1v ~ 3.6v
Operating Tempature: -40 ~ 85°C
I/O pins: Refer to STM32L072 datasheet
Power Consumption:
STOP Mode: 2.7uA @ 3.3v
LoRa Transmit Mode:
125mA @ 20dBm 44mA @ 14dBm
Battery:
Li/SOCI2 unchargable battery
Capacity: 4000mAh
Self Discharge: <1% / Year @ 25°C
Max continuously current: 130mA
Max boost current: 2A, 1 second
Dimensions:
Size:65 x 50 x 50mm
Net Weight: 140g
Features
STM32L072CZT6 MCU
SX1276/78 Wireless Chip
Pre-load bootloader on USART1/USART2
MDK-ARM Version 5.24a IDE
I2C,LPUSART1,USB
2x12bit ADC, 1x12bit DAC
18xDigital I/Os
LoRa™ Modem
Preamble detection