Heltec STM32L151CBU6 Development Board LoRaWAN Low Power IoT Node CP2102 USB to Serial Port SX1278 Module

Description

Heltec LoRa Node Products Difference Table:”Heltec LoRa” product family already included follow options:LoRa spread spectrum communication (node);Battery powered;Good RF circuit design and impedance matching.ProductType①MCUFLASHBatteryBattery DetectVext③Low Power④DisplayWiFi LoRa 32Dev-BoardESP324MBLithium②xxxOLED (128×64)WiFi LoRa 32(V2)(Product ID: 1639291)Dev-BoardESP328MBLithium②√√800uAOLED (128×64)Wireless Stick(Product ID: 1639290)Dev-BoardESP328MBLithium②√√800uAOLED (64×32)Wireless Stick Lite(Product ID: 1638098)Dev-BoardESP32-PICO4MBLithium②√√35uAxWireless Shell(Product ID: 1638101)ModuleESP32-PICO4MB-√x10uAxLoRa Kit 151(This item)Dev-BoardSTM32L151CBU6128kBLithiumxx7uAxLoRa Node 151(Product ID: 1638100)Dev-BoardSTM32L151CCU6256kB1/2 AA Lithium chlorine sulfite battery√√1.8uAxTurtle Board(Product ID: 1638099)Dev-BoardSTM32L432KC256kBAAA x 2√√5uAxNotes:① – Type:Dev-Board – Can be used directly;Module – Only core function, need to cooperate with external PCB or circuit.② – Lithium: All lithium battery socket for Heltec boards is SH1.25-2;③ – Vext: 3.3V(500mA) output, for external devices (e.g. sensors) power supply, in deep sleep mode, Vext can be shut down via software;④ – Low Power: Products’ low power design, of Whole Circuit, the measured data are the current of the system during deep sleep.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.SourceParameterMCUSTM32L151CBU6 (Ultra-low-power 32-bit MCU ARM®-based Cortex®-M3)LoRa chipSX1278LoRa bandsEU_433, CN_470_510,two bands optionalLoRa maximum output power18dB ± 1dBHardware ResourceUSART x 3; SPI x 2; I2C x 2; ; USB 2.0 x 112 – bits ADC; 12 – bits DACDMA controller28 general GPIOFlash128KB FLASH;16KB SRAM;4KB EEPROM;80B BACKUP REGISTERInterfaceMicro USB x 1; LoRa antenna(IPEX) x 1length x width x height(pin)57 x 27 x 7(14) mmBattery typeLithiumLow power designDeep Sleep: 6uAElectrical characteristicsConditionMinimumTypicalMaximumPower SupplyUSB powered(≥500mA)4.7V5V6VLithiumpowered(≥250mA)3.3V3.6V4.2V3.3V(pin)powered(≥150mA)2.7V3.3V3.5V5V(pin)powered(≥500mA)4.7V5V6VPower consumption(mA)LoRa 10dBemission50mALoRa 12dBemission60mALoRa 15dB emission110mALoRa 20dBemission130mAOutput3.3V pin output500mA5V pin output (USB powered only)Equal to the input currentExternal device power control (Vext 3.3V)350mAPackage includes:1 xSTM32L151CBU6 Development BoardLoRa 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.zipLoRa Kit 151 Schematic diagram:https://docs.heltec.cn/download/LoRa_Kit_151_sch_diagram.PDFSummary of Common Problems:http://www.heltec.cn/summary-of-common-problems-in-wifi-kit-series-continuous-update/?lang=en