ST STM32L476Gxx系列超低功耗MCU開發(fā)方案.docx

ST STM32L476Gxx系列超低功耗MCU開發(fā)方案ST公司的STM32L476Gxx系列是基于高性能ARM Cortex-M4 32位RISC內(nèi)核的超低功耗微控制器(MCU),工作頻率高達(dá)80MHz,具有嵌入高速存儲(chǔ)器(閃存高達(dá)1MB,SRAM高達(dá)128KB)和靈活的外接存儲(chǔ)器控制器(FSMC),Quad SPI閃存接口和各種增強(qiáng)的I/O和外設(shè).此外,器件還有三個(gè)快速12位ADC,兩個(gè)比較器,兩個(gè)運(yùn)放,兩個(gè)DAC通路和一個(gè)基準(zhǔn)電壓緩沖器,低功耗RTC,兩個(gè)通用32位計(jì)時(shí)器,兩個(gè)16位PWM計(jì)時(shí)器,七個(gè)通用16位計(jì)時(shí)器以及兩個(gè)低功耗16位計(jì)時(shí)器.本文介紹了STM32L476xx系列主要特性,框圖,以及評(píng)估板STM32L476G-EVAL主要特性,框圖,電路圖,材料清單和PCB元件布局圖.The STM32L476xx devices are the ultra-low-power microcontrollers based on the high-performance ARM Cortex-M4 32-bit RISC core operating at a frequency of up to 80 MHz. The Cortex-M4 core features a Floating point unit (FPU) single precision which supports all ARM single-precision data-processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) which enhances application security. The STM32L476xx devices embed high-speed memories (Flash memory up to 1 Mbyte, up to 128 Kbyte of SRAM), a flexible external memory controller (FSMC) for static memories (for devices with packages of 100 pins and more), a Quad SPI flash memories interface (available on all packages) and an extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses and a 32-bit multi-AHB bus matrix.The STM32L476xx devices embed several protection mechanisms for embedded Flash memory and SRAM: readout protection, write protection, proprietary code readout protection and Firewall. The devices offer up to three fast 12-bit ADCs (5 Msps), two comparators, two operational amplifiers, two DAC channels, an internal voltage reference buffer, a low-power RTC, two general-purpose 32-bit timer, two 16-bit PWM timers dedicated to motor control, seven general-purpose 16-bit timers, and two 16-bit low-power timers. The devices support four digital filters for external sigma delta modulators (DFSDM). In addition, up to 24 capacitive sensing channels are available. The devices also embed an integrated LCD driver 8x40 or 4x44, with internal step-up converter.They also feature standard and advanced communication interfaces. Three I2Cs Three SPIs Three USARTs, two UARTs and one Low-Power UART. Two SAIs (Serial Audio Interfaces) One SDMMC One CAN One USB OTG full-speed One SWPMI (Single Wire Protocol Master Interface)The STM32L476xx operates in the -40 to +85 (+105 junction), -40 to +105 (+125 junction) and -40 to +125 (+130 junction) temperature ranges from a 1.71 to 3.6 V power supply. A comprehensive set of power-saving modes allows the design of low-power applications. Some independent power supplies are supported: analog independent supply input for ADC, DAC, OPAMPs and comparators, 3.3 V dedicated supply input for USB and up to 14 I/Os can be supplied independently down to 1.08V. A VBAT input allows to backup the RTC and backup registers. The STM32L476xx family offers six packages from 64-pin to 144-pin packages.STM32L476xx系列主要特性: Ultra-low-power with FlexPowerControl 1.71 V to 3.6 V power supply -40 to 85/105/125 temperature range 300 nA in VBAT mode: supply for RTC and 32x32-bit backup registers 30 nA Shutdown mode (5 wakeup pins) 120 nA Standby mode (5 wakeup pins) 420 nA Standby mode with RTC 1.1 A Stop 2 mode, 1.4 A Stop 2 with RTC 100 A/MHz run mode Batch acquisition mode (BAM) 4 s wakeup from Stop mode Brown out reset (BOR) in all modes except shutdown Interconnect matrix Core: ARM 32-bit Cortex-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator) allowing 0-wait-state execution from Flash memory,frequency up to 80 MHz, MPU, 100DMIPS/1.25DMIPS/MHz (Dhrystone 2.1), and DSP instructions Clock Sources 4 to 48 MHz crystal oscillator 32 kHz crystal oscillator for RTC (LSE) Internal 16 MHz factory-trimmed RC (1%) Internal low-power 32 kHz RC (5%) Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than 0.25 % accuracy) 3 PLLs for system clock, USB, audio, ADC RTC with HW calendar, alarms and calibration LCD 8 40 or 4 44 with step-up converter Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors 16x timers: 2 x 16-bit advanced motor-control, 2 x 32-bit and 5 x 16-bit general purpose, 2x 16-bit basic, 2x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer Up to 114 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V Memories Up to 1 MB Flash, 2 banks read-while-write, proprietary code readout protection Up to 128 KB of SRAM including 32 KB with hardware parity check External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories Quad SPI memory interface 4x digital filters for sigma delta modulator Rich analog peripherals (independent supply) 3 12-bit ADC 5 Msps, up to 16-bit with hardware oversampling, 200 A/Msps 2x 12-bit DAC, low-power sample and hold 2x operational amplifiers with built-in PGA 2x ultra-low-power comparators 18x communication interfaces USB OTG 2.0 full-speed, LPM and BCD 2x SAIs (serial audio interface) 3x I2C FM+(1 Mbit/s), SMBus/PMBus 6x USARTs (ISO 7816, LIN, IrDA, modem) 3x SPIs (4x SPIs with the Quad SPI) CAN (2.0B Active) and SDMMC interface SWPMI single wire protocol master I/F 14-channel DMA controller True random number generator CRC calculation unit, 96-bit unique ID Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell圖1.STM32L476xx系列框圖評(píng)估板STM32L476G-EVALThe STM32L476G-EVAL evaluation board is designed as complete demonstration and development platform for STMicroelectronics ARM Cortex-M4-core-based STM32L476ZGT6 microcontroller with three IC buses, three SPI and six USART ports, CAN port, SWPMI, two SAI ports, 12-bit ADC, 12-bit DAC, LCD driver, internal 128-Kbyte SRAM and 1-Mbyte Flash memory, Quad-SPI port, touch sensing capability, USB OTG FS port, LCD controller, flexible memory controller (FMC), JTAG debug port. STM32L476G-EVAL can be used as reference design for user application development, although it is not considered as final application. A full range of hardware features on the board helps users evaluate all on-board peripherals such as USB, USART, digital microphones, ADC and DAC, dot-matrix TFT LCD, LCD glass module, IrDA, LDR, SRAM, NOR Flash memory device, Quad-SPI Flash memory device, microSD card, sigma-delta modulators, smartcard with SWP, CAN transceiver, EEPROM, RF-EEPROM. Extension headers allow connecting daughterboards or wrapping boards. ST-LINK/V2-1 in-circuit debugger and flashing facility is integrated on the mainboard.圖2.評(píng)估板STM32L476G-EVAL外形圖評(píng)估板STM32L476G-EVAL主要特性: STM32L476ZGT6 microcontroller with 1-Mbyte Flash memory and 128-Kbyte RAM four power supply options: power jack, ST-LINK/V2-1 USB connector, USB OTG FS connector, daughterboard microcontroller supply voltage: 3.3 V or range from 1.71 V to 3.6 V two MEMS digital microphones two stereo audio headphones jack outputs with independent audio content slot for microSD card supporting SD, SDHC, SDXC 4-Gbyte microSD card bundled 16-Mbit (1M x 16 bit) SRAM device 128-Mbit (8M x 16 bit) NOR Flash memory device 256-Mbit Quad-SPI Flash memory device with double transfer rate (DTR)support RF-EEPROM with IC bus EEPROM supporting 1 MHz IC-bus communication speed RS-232 port configurable for communication or MCU flashing IrDA transceiver USB OTG FS Micro-AB port CAN 2.0A/B-compliant port joystick with four-way controller and selector reset and wake-up / tamper buttons touch-sensing button light-dependent resistor (LDR) potentiometer coin battery cell for power backup LCD glass module daughterboard (MB979) with 40x8-segment LCD driven directly by STM32L476ZGT6 2.8-inch 320x240 dot-matrix color TFT LCD panel with resistive touchscreen smartcard connector and SWP support NFC transceiver connector connector for ADC input and DAC output power-metering demonstration with dual-channel sigma-delta modulator PT100 thermal sensor with dual-channel sigma-delta modulator MCU current consumption measurement circuit access to comparator and operational amplifier of STM32L476ZGT6 extension connector for motor control module JTAG/SWD, ETM trace debug support, user interface through USB virtual COM port, embedded ST-LINK/V2-1 debug and flashing facility extension connector for daughterboard圖3.評(píng)估板STM32L476G-EVAL框圖圖4.評(píng)估板STM32L476G-EVAL主要元件布局圖圖5.評(píng)