DESCRIPTION
Heltec LoRa Node Products Difference Table:
Heltec product family already included follow options:
LoRa spread spectrum communication (node);
Battery powered;
Good RF circuit design and impedance matching.
Product: Type MCU FLASH Battery Battery Detect Vext Low Power Display
WiFi LoRa 32: Dev-Board ESP32 4MB Lithium x x x OLED (128x64)
WiFi LoRa 32(V2).
(Product ID: 1639291): Dev-Board ESP32 8MB Lithium 800uA OLED (128x64)
Wireless Stick.
(Product ID: 1639290): Dev-Board ESP32 8MB Lithium 800uA OLED (64x32)
Wireless Stick Lite.
(Product ID: 1638098): Dev-Board ESP32-PICO 4MB Lithium 35uA x
Wireless Shell.
(Product ID: 1638101): Module ESP32-PICO 4MB x 10uA x
LoRa Kit 151.
(This item): Dev-Board STM32L151CBU6 128kB Lithium x x 7uA x
LoRa Node 151.
(Product ID: 1638100): Dev-Board STM32L151CCU6 256kB 1/2 AA Lithium chlorine sulfite battery ??? ??? 1.8uA x
Turtle Board.
(Product ID: 1638099): Dev-Board STM32L432KC 256kB AAA x 2 5uA x
Notes:
Type:
Dev-Board, Can be used directly;
Module: Only core function, need to cooperate with external PCB or circuit.
Lithium: All lithium battery socket for Heltec boards is SH1.25-2;
Vext: 3.3V(500mA) output, for external devices (e.g. sensors) power supply, in deep sleep mode, Vext can be shut down via software;
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, 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, RAM16K, 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
