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ST公司的STM32L072xx是系于ARM Cortex®-M0+核的超低功耗32位MCU,集成了高达192KB闪存,20KB SRAM,6KB EEPROM以及USB,ADC和DAC等模拟特点.工作电压1.65-3.6V,工作温度-40 到125℃,待机模式电流0.29 μA ,主要用在气表/水表和工业传感器,康健和健美设备,遥控和用户接口,PC外游戏和GPS设备以及告警系统,有线和无线传感器与视频毗连.本京电港论坛文章先容了STM32L072xx系列主要特性,框架图和时钟树,以及包罗P-NUCLEO-LRWAN1(NUCLEO-L073RZ板和I-NUCLEO-SX1272D RF扩展板的Nucleo包主要特性,系统框图和I-NUCLEO-SX1272D RF扩展板电路原理图纸. STM32L072x8 STM32L072xB STM32L072xZUltra-low-power 32-bit MCU ARM®-based Cortex®-M0+, up to 192KB Flash, 20KB SRAM, 6KB EEPROM, USB, ADC, DACs The ultra-low-power STM32L072xx are offered in 9 different package typesfrom 32 pins to 100 pins. Depending on the device chosen, different sets of peripherals are included, the description below gives an overview of the complete range of peripherals proposed in this family. These features make the ultra-low-power STM32L072xx microcontrollers suitable for a wide range of applications: Gas/water meters and industrial sensors The ultra-low-power STM32L072xx microcontrollers incorporate the connectivity power of the universal serial bus (USB 2.0 crystal-less) with the high-performance ARM® Cortex®- M0+ 32-bit RISC core operating at a 32 MHz frequency, a memory protection unit (MPU), high-speed embedded memories (up to 192 Kbytes of Flash program memory, 6 Kbytes of data EEPROM and 20 Kbytes of RAM) plus an extensive range of enhanced I/Os and peripherals. The STM32L072xx devices provide high power efficiency for a wide range of performance. It is achieved with a large choice of internal and external clock sources, an internal voltage adaptation and several low-power modes. The STM32L072xx devices offer several analog features, one 12-bit ADC with hardware oversampling, two DACs, two ultra-low-power comparators, several timers, one low-power timer (LPTIM), four general-purpose 16-bit timers and two basic timer, one RTC and one SysTick which can be used as timebases. They also feature two watchdogs, one watchdog with independent clock and window capability and one window watchdog based on bus clock. Moreover, the STM32L072xx devices embed standard and advanced communication interfaces: up to three I2Cs, two SPIs, one I2S, four USARTs, a low-power UART (LPUART), and a crystal-less USB. The devices offer up to 24 capacitive sensing channels to simply add touch sensing functionality to any application. The STM32L072xx also include a real-time clock and a set of backup registers that remain powered in Standby mode. The ultra-low-power STM32L072xx devices operate from a 1.8 to 3.6 V power supply (down to 1.65 V at power down) with BOR and from a 1.65 to 3.6 V power supply without BOR option. They are available in the -40 to +125 °C temperature range. A comprehensive set of power-saving modes allows the design of low-power applications. STM32L072xx系列主要特性: Ultra-low-power platform Nucleo包P-NUCLEO-LRWAN1(NUCLEO-L073RZ板和I-NUCLEO-SX1272D RF扩展板) The ultra-low-power STM32 and LoRa® Nucleo pack (P-NUCLEO-LRWAN1) is a kit based on a NUCLEO-L073RZ board, an I-NUCLEO-SX1272D LoRa® RF expansion board from Semtech corporation and a sub-gigahertz sma antenna. The expansion board includes the low-power transceiver SX1272 which features the long-range modem LoRa®. This modem provides high-performance LoRa® modulation as well as OOK / FSK modulation. It is optimized for use in the 868MHz and 915MHz bands and its maximum output power is 14dBm. The P-NUCLEO-LRWAN1 Nucleo pack is compatible with the I-CUBE-LRWAN1 software expansion, a certified middleware stack (V1.0), compliant with the LoRaWAN™ specifications V1.0.1. It provides support for bidirectional end-devices in Class-A and Class-C protocols and for end-devices activation either through over-the-air activation (OTAA) or activation by personalization (ABP). After introducing briefly end-to-end operations, this document describes the main components of the P-NUCLEO-LRWAN1 Nucleo pack and how to configure them to join and participate to a LoRa® network. 硬件元件包括: • NUCLEO-L073RZ board (see Section 2.1: NUCLEO-L073RZ board) NUCLEO-L073RZ board The NUCLEO-L073RZ board embeds an STM32L073RZ MCU, a 32-bit microcontroller based on Cortex®-M0+ with 192-Kbyte Flash memory, 20-Kbyte SRAM: these characteristics, together with its peripheral set, enable the LoRa middleware stack (I-CUBE-LRWAN) to run. Moreover, the NUCLEO-L073RZ board embeds the ST morpho extension pin headers for full access to all STM32 I/Os and an on-board ST-LINK/V2-1 debugger/programmer with SWD connector able also to manage the serial communication with the STM32L073RZ. User can power up the NUCLEO-L073RZ board by connecting it to a PC through a USB cable. However, the ideal setup for the end-device is to be battery operated. Attach a battery holder for 3 x Alkaline AAA (or AA) batteries at the back of the NUCLEO-L073RZ board and connect/solder the +/- terminals to the power pins on the ST morpho connector as shown in Figure 3. Set the jumper JP5 to E5V so that the board takes the power from the battery. Now the resistor R32 can be removed to reduce the current consumption of the board. Put a jumper on JP1 to allow the ST-LINK debugger to release the reset pin of the target STM32, when the ST-LINK USB is not connected and enumerated on the PC. This allows the STM32 to execute the firmware with the NUCLEO-L073RZ board connected to the PC through the USB. I-NUCLEO-SX1272D expansion board NUCLEO-SX1272D is the STMicroelectronics code name of the ARM® mbed™ shield SX1272MB2DAS. It embeds a LoRa RF transceiver SX1272 chip and all associated RF matching and filtering components enabling one-single, 50ohm antenna port. I-NUCLEO-SX1272D embeds its 32MHz crystal as well. The I-NUCLEO-SX1272D is fully controlled by SPI and interrupt lines. Optionally Grove compatible sensors can be plugged on the expansion boards.
Gateway 2.3.1 SemtechIoT starter kit This kit is designed to offer a self-contained Plug and Play local loop for all IoT object designers, allowing them to verify that their design is able to connect to a public IoT network, following the LoRaWAN specifications. No connection to an Ethernet network is required, and this simplifies the setup of the starter kit. A simple cross-over Ethernet cable is used to access the kit. It is composed of: • RaspberryPi B+ with its LoRaIoT shield unit and pre-installed microSD™ card • SX1301-based concentrator reference design |
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