原标题：ST STM32L053C8 32位ARM MCU开发方案

　　ST公司的stm32L053C8是超低功耗ARM Cortex-M0+ MCU,集成了64KB闪存,USB和LCD,CPU工作频率从32 kHz 到32 MHz , 0.95 DMIPS/MHz,工作电压1.65 V到3.6 V,待机模式功耗0.27 μA,主要用在气/水表和工业传感器,健康健美设备,遥控和用户接口,PC外,游戏,GPS设备和告警系统,有线和无线传感器以及视频互连.本文介绍了STM32L053C8主要特性,框图,以及STM32L053Discovery板主要特性,框图,电路图,PCB元件布局图和设计文件.

　　The ultra-low-power STM32L053x6/8 are offered in 3 different package types: from 48 pins to 64 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 STM32L053x6/8 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

　　The ultra-low-power STM32L053x6/8 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 64 Kbytes of Flash program memory, 2 Kbytes of data EEPROM and 8 Kbytes of RAM) plus an extensive range of enhanced I/Os and peripherals. The　STM32L053x6/8 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 STM32L053x6/8 devices offer several analog features, one 12-bit ADC with hardware oversampling, one DAC, two ultra-low-power comparators, several timers, one low-power timer (LPTIM), three general-purpose 16-bit timers and one 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 STM32L053x6/8 devices embed standard and advanced communication interfaces: up to two I2C, two SPIs, one I2S, two 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 STM32L053x6/8 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 STM32L053x6/8 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.

　　STM32L053C8主要特性:

　　Ultra-low-power platform

　　– 1.65 V to 3.6 V power supply

　　– -40 to 125℃ temperature range

　　– 0.27 μA Standby mode (2 wakeup pins)

　　– 0.4 μA Stop mode (16 wakeup lines)

　　– 0.8 μA Stop mode + RTC + 8 KB RAM retention

　　– 88 μA/MHz in Run mode

　　– 3.5 μs wakeup time (from RAM)

　　– 5 μs wakeup time (from Flash memory) 

　　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

　　– PLL for CPU clock 

　　Pre-programmed bootloader

　　– USART, SPI supported 

　　Development support

　　– Serial wire debug supported 

　　Up to 51 fast I/Os (45 I/Os 5V tolerant) 

　　Memories

　　– Up to 64 KB Flash memory with ECC

　　– 8KB RAM

　　– 2 KB of data EEPROM with ECC

　　– 20-byte backup register

　　– Sector protection against R/W operation 

　　LCD driver for up to 8×28segments

　　– 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)

　　– 12-bit 1 channel DAC 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 

　　8x peripheral communication interfaces

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

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

　　– Up to 4x SPI 16 Mbits/s

　　– 2x I2C (SMBus/PMBus) 

　　9x timers: 1x 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, 1x 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.STM32L053C8框图

　　STM32L053Discovery板32L0358DISCOVERY

　　The STM32L053 discovery kit (32L0358DISCOVERY) helps the user discover the full range of features of the STM32L0 series and develop applications. It is based on STM32L053C8T6 and includes ST-LINK/V2-1 embedded debug tool interface, linear touch sensor, touch keysRev 3, IDD current measurement, 2.04” E-paper display, NFC connector for PLUG-CR95HF-B board, LEDs, pushbuttons and USB Mini-B connector.

　　图2.STM32L053Discovery板32L0358DISCOVERY外形图

　　STM32L053Discovery板主要特性:

　　• STM32L053C8T6 microcontroller featuring 64 Kbytes of Flash memory and 8 Kbytes of RAM, in an LQFP48 package

　　• On-board ST-LINK/V2-1 with selection mode switch to use the kit as a standalone programming and debugging tool (with SWD connector for programming and debugging)

　　• mbed™-enabled (mbed.org)

　　• USB ST-LINK with re-enumeration capability and three different interfaces:

　　– Virtual COM port

　　– Mass storage

　　– Debug port

　　• Board power supply: through USB bus or from an external 5 V supply voltage

　　• External application power supply: 3 V and 5 V

　　• One linear touch sensor or four touch keys

　　• IDD current measurement

　　• 2.04” E-paper Display, 172x72 pixels

　　• NFC connector for PLUG-CR95HF-B board

　　• USB USER with Mini-B connector

　　• Four LEDs:

　　– LD1 (red/green) for USB communication

　　– LD2 (red) for 3.3 V power on

　　– Two user LEDs: LD3 (green), LD4 (red)

　　• Two pushbuttons (user and reset)

　　• Extension header for LQFP48 I/Os for a quick connection to the prototyping board and easy probing

　　图3.STM32L053Discovery板硬件框图