Feature:
-In order to meet the user’s requirements for Ultra-Low-Power and standard LoRaWAN protocol, we designed this product. On the basis of STM32L151CBU6MCU and SX1278 LoRa chip(433, 470MHz), the low power current can reach to 6uA.
-CE Certificate;
-Microprocessor: STM32L151CBU6 (Ultra-low-power ARM Cortex-M3 MCU with 128 Kbytes Flash), with LoRa node chip SX1278 (433MHz ~ 510MHz);
-Micro USB interface with a complete voltage regulator, ESD protection, short circuit protection, and other protection measures;
-Onboard SH1.25-2 battery interface, integrated lithium battery interface, integrated battery management system (battery power detection, USB / battery power automatic switching);
-Integrated CP2102 USB to serial port chip, convenient for program downloading, debugging information printing;
-This product supports DFU mode download (need to cooperate with relevant download software).
-System resource: FLASH – 128K, RAM – 16K, EEPROM – 4K;
-User available resources: FLASH – 64K, RAM – 8K, EEPROM – 4K;
-Provide standard LoRaWAN protocol routines.
-With good RF circuit design and basic low-power design (sleep current ≤7uA), it is convenient for IoT application vendors to quickly verify
-LoRaWAN protocol easily.
| Source |
Parameter |
| MCU |
STM32L151CBU6 (Ultra-low-power 32-bit MCU ARM®-based Cortex®-M3) |
| LoRa chip |
SX1278 |
| LoRa bands |
EU_433, CN_470_510,two bands optional |
| LoRa maximum output power |
18dB ± 1dB |
| Hardware Resource |
USART x 3; SPI x 2; I2C x 2; ; USB 2.0 x 1 |
| 12 – bits ADC; 12 – bits DAC |
| DMA controller |
| 28 general GPIO |
| Flash |
128KB FLASH;16KB SRAM;4KB EEPROM;80B BACKUP REGISTER |
| Interface |
Micro USB x 1; LoRa antenna(IPEX) x 1 |
| length x width x height(pin) |
57 x 27 x 7(14) mm |
| Battery type |
Lithium |
| Low power design |
Deep Sleep: 6uA |
| Electrical characteristics |
Condition |
Minimum |
Typical |
Maximum |
| Power Supply |
USB powered(≥500mA) |
4.7V |
5V |
6V |
| Lithium powered(≥250mA) |
3.3V |
3.6V |
4.2V |
| 3.3V(pin)powered(≥150mA) |
2.7V |
3.3V |
3.5V |
| 5V(pin)powered(≥500mA) |
4.7V |
5V |
6V |
| Power consumption(mA) |
LoRa 10dB emission |
|
50mA |
|
| LoRa 12dB emission |
|
60mA |
|
| LoRa 15dB emission |
|
110mA |
|
| LoRa 20dB emission |
|
130mA |
|
| Output |
3.3V pin output |
|
|
500mA |
| 5V pin output (USB powered only) |
|
Equal to the input current |
|
| External device power control (Vext 3.3V) |
|
|
350mA |
Package includes:
1 x STM32L151CBU6 Development Board
LoRa Kit 151 Example Code:
LoRa Kit 151 Pingpang test example code (need two LoRa Kit 151 to test): https://heltec.org/wp-content/uploads/2019/07/Kit_151_PingPang.zip
LoRa Kit 151 Schematic diagram:
https://docs.heltec.cn/download/LoRa_Kit_151_sch_diagram.PDF
Summary of Common Problems:
http://www.heltec.cn/summary-of-common-problems-in-wifi-kit-series-continuous-update/?lang=en
