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基于ST公司的STM32L073超低功耗32位ARM MCU开发方案

来源：中电网

2018-11-06

类别：汽车电子

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拍明

原标题：ST STM32L073超低功耗32位ARM MCU开发方案

　　ST公司的stm32L073xx系列是超低功耗32位ARM MCU,内核是带MPU的ARM Cortex®-M0+,工作频率从32kHz到32MHz,性能为0.95 DMIPS/MHz,集成了带ECC的高达192KB的闪存,20KB RAM和带ECC的6KB数据EEPROM,工作电压1.65V-3.6V,工作温度-40 到 125 °C,待机模式0.29 μA,主要用在气/水表和工业传感器,健康和健身设备,遥控和用户接口,PC外设,游戏和GPS设备,告警系统,无线和有线传感器以及视频互连.本文介绍了STM32L073主要特性,框图和时钟树,以及评估板STM32L073Z-EVAL主要特性,硬件框图和电路图.

　　The ultra-low-power STM32L073xx are offered in 5 different package types from 48 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 STM32L073xx microcontrollers suitable for a wide range of applications:

　　Gas/water meters and industrial sensors

　　Healthcare and fitness equipment 

　　Remote control and user interface 

　　PC peripherals, gaming, GPS equipment 

　　Alarm system, wired and wireless sensors, video intercom

　　This STM32L073xx datasheet should be read in conjunction with the STM32L0x3xx reference manual (RM0367).

　　The ultra-low-power STM32L073xx 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 STM32L073xx 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 STM32L073xx device 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 STM32L073xx 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 STM32L073xx also include a real-time clock and a set of backup registers that remain powered in Standby mode. Finally, their integrated LCD controller has a built-in LCD voltage generator that allows to drive up to 8 multiplexed LCDs with contrast independent of the supply voltage. The ultra-low-power STM32L073xx 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.

　　STM32L073主要特性:

　　Ultra-low-power platform

　　– 1.65 V to 3.6 V power supply

　　– -40 to 125 ℃ temperature range

　　– 0.29 μA Standby mode (3 wakeup pins)

　　– 0.43 μA Stop mode (16 wakeup lines)

　　– 0.86 μA Stop mode + RTC + 20 KB RAM retention

　　– Down to 93 μA/MHz in Run mode

　　– 5 μs wakeup time (from Flash memory)

　　– 41 μA 12-bit ADC conversion at 10 ksps

　　Core: ARM® 32-bit Cortex®-M0+ with MPU

　　– From 32 kHz up to 32 MHz max.

　　– 0.95 DMIPS/MHz 

　　Reset and supply management

　　– Ultra-safe, low-power BOR (brownout reset) with 5 selectable thresholds

　　– Ultra-low-power POR/PDR

　　– Programmable voltage detector (PVD) 

　　Clock sources

　　– 1 to 25 MHz crystal oscillator

　　– 32 kHz oscillator for RTC with calibration

　　– High speed internal 16 MHz factory-trimmed RC (+/- 1%)

　　– Internal low-power 37 kHz RC

　　– Internal multispeed low-power 65 kHz to 4.2 MHz RC

　　– Internal self calibration of 48 MHz RC for USB

　　– PLL for CPU clock 

　　Pre-programmed bootloader

　　– USB, USART supported 

　　Development support

　　– Serial wire debug supported 

　　Up to 84 fast I/Os (78 I/Os 5V tolerant) 

　　Memories

　　– Up to 192 KB Flash memory with ECC (2 banks with read-while-write capability)

　　– 20KB RAM

　　– 6 KB of data EEPROM with ECC

　　– 20-byte backup register

　　– Sector protection against R/W operation 

　　LCD driver for up to 4x52 or 8x48 segments

　　– Support contrast adjustment

　　– Support blinking mode

　　– Step-up converted on board 

　　Rich Analog peripherals

　　– 12-bit ADC 1.14 Msps up to 16 channels (down to 1.65 V)

　　– 2 x 12-bit channel DACs with output buffers (down to 1.8 V)

　　– 2x ultra-low-power comparators (window mode and wake up capability, down to 1.65 V) Up to 24 capacitive sensing channels supporting touchkey, linear and rotary touch sensors  7-channel DMA controller, supporting ADC, SPI, I2C, USART, DAC, Timers 

　　11x peripheral communication interfaces

　　– 1x USB 2.0 crystal-less, battery charging detection and LPM

　　– 4x USART (2 with ISO 7816, IrDA), 1x UART (low power)

　　– Up to 6x SPI 16 Mbits/s

　　– 3x I2C (2 with SMBus/PMBus) 

　　11x timers: 2x 16-bit with up to 4 channels, 2x 16-bit with up to 2 channels, 1x 16-bit ultra-low-power timer, 1x SysTick, 1x RTC, 2x 16-bit basic for DAC, and 2x watchdogs (independent/window) 

　　CRC calculation unit, 96-bit unique ID 

　　True RNG and firewall protection 

　　All packages are ECOPACK®2

　　图1. STM32L073xx框图

　　图2. STM32L073xx时钟树

　　评估板STM32L073Z-EVAL

　　The STM32L073Z-EVAL evaluation board is designed as a complete demonstration and development platform for the STMicroelectronics ARM® Cortex®-M0+ core-based STM32L073VZT6 microcontroller with three I2C buses, two SPI interfaces, four USART interfaces, one UART interface, 12-bit ADC and DAC, LCD driver, up to 192-Kbyte Flash memory, 20-Kbyte RAM, 6-Kbyte Touch sensing, USB OTG FS, LCD controller, SWD debugging support. This evaluation board can be used as reference design for user application development but it is not considered as a final application. The full range of hardware features on the board can help the user to evaluate all peripherals (USB OTG FS, USART, 12-bit ADC and DAC, color TFT LCD, LCD glass, USART, low-power UART, IrDA, microSD card, touch sensing slider, pressure measurement, temperature measurement, LC sensor metering) and develop his applications. The extension headers offer the possibility to connect a daughterboard or a wrapping board for a specific application. An embedded ST-LINK/V2-1 debugger facilitates the software development and the programming of the STM32L073VZT6 microcontroller.