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ST公司的STM32F051xx系列采用高性能ARM Cortex-M0 32位RISC內核,工作頻率48MHz,具有高速嵌入存儲器(多達64KB閃存和多達8KB SRAM)以及擴展外設和I/O口.所有器件具有標準通信接口(多達兩個I2C,兩個SPI,一個I2S,一個HDMI CEC和多達兩個USART),一個12位ADC,一個12位DAC,多達5個通用16位計時器,一個32位計時器和PWM計時器.主喲用在應用控制和用戶接口,手持設備,A/V接收器和DTV,PC外設,游戲和GPS平臺,PLC,逆變器,打印機,掃描儀,告警系統,視頻互連和HVAC等.本文介紹了STM32F051xx主要特性,方框圖和時鐘子系統方框圖,以及STM320518-EVAL評估板主要特性,方框圖,電路圖和PCB布局圖. The STM32F051xx family incorporates the high-performance ARM Cortex-M0 32-bit RISC core operating at a 48 MHz frequency, high-speed embedded memories (Flash memory up to 64 Kbytes and SRAM up to 8 Kbytes), and an extensive range of enhanced peripherals and I/Os. All devices offer standard communication interfaces (up to two I2Cs, two SPIs, one I2S, one HDMI CEC, and up to two USARTs), one 12-bit ADC, one 12-bit DAC, up to five general-purpose 16-bit timers, a 32-bit timer and an advanced-control PWM timer. The STM32F051xx family operates in the -40 to +85 C and -40 to +105 C temperature ranges, from a 2.0 to 3.6 V power supply. A comprehensive set of power-saving modes allows the design of low-power applications. The STM32F051xx family includes devices in three different packages ranging from 32 pins to 64 pins. Depending on the device chosen, different sets of peripherals are included. The description below provides an overview of the complete range of peripherals proposed in this family. These features make the STM32F051xx microcontroller family suitable for a wide range of applications such as application control and user interfaces, handheld equipment, A/V receivers and digital TV, PC peripherals, gaming and GPS platforms, industrial applications, PLCs, inverters, printers, scanners, alarm systems, video intercoms, and HVACs STM32F051xx主要特性: Operating conditions: Voltage range: 2.0 V to 3.6 V ARM 32-bit Cortex-M0 CPU (48 MHz max) Memories 16 to 64 Kbytes of Flash memory 8 Kbytes of SRAM with HW parity checking CRC calculation unit Clock management 4 to 32 MHz crystal oscillator 32 kHz oscillator for RTC with calibration Internal 8 MHz RC with x6 PLL option Internal 40 kHz RC oscillator Calendar RTC with alarm and periodic wakeup from Stop/Standby Reset and supply management Power-on/Power down reset (POR/PDR) Programmable voltage detector (PVD) Low power Sleep, Stop, and Standby modes VBAT supply for RTC and backup registers 5-channel DMA controller 1 x 12-bit, 1.0 us ADC (up to 16 channels) Conversion range: 0 to 3.6V Separate analog supply from 2.4 up to 3.6 V Two fast low-power analog comparators with programmable input and output One 12-bit D/A converter Up to 55 fast I/Os All mappable on external interrupt vectors Up to 36 I/Os with 5 V tolerant capability Up to 18 capacitive sensing channels supporting touchkey, linear and rotary touch sensors 96-bit unique ID Serial wire debug (SWD) Up to 11 timers One 16-bit 7-channel advanced-control timer for 6 channels PWM output, with deadtime generation and emergency stop One 32-bit and one 16-bit timer, with up to 4 IC/OC, usable for IR control decoding One 16-bit timer, with 2 IC/OC, 1 OCN, deadtime generation and emergency stop Two 16-bit timers, each with IC/OC and OCN, deadtime generation, emergency stop and modulator gate for IR control One 16-bit timer with 1 IC/OC Independent and system watchdog timers SysTick timer: 24-bit downcounter One 16-bit basic timer to drive the DAC Communication interfaces Up to two I2C interfaces; one supporting Fast Mode Plus (1 Mbit/s) with 20 mA current sink,SMBus/PMBus, and wakeup from STOP Up to two USARTs supporting master synchronous SPI and modem control; one with ISO7816 interface, LIN, IrDA capability auto baud rate detection and wakeup feature Up to two SPIs (18 Mbit/s) with 4 to 16 programmable bit frame, 1 with I2S interface multiplexed HDMI CEC interface, wakeup on header reception 
圖1.STM32F051xx方框圖
圖2.STM32F051xx時鐘子系統方框圖 STM320518-EVAL評估板 The STM320518-EVAL evaluation board is designed as a complete demonstration and development platform for STMicroelectronic’s ARM cortex-M0 core-based STM32F051R8T6 microcontroller. It features two I2Cs, two SPIs, two USARTs, a 12-bit ADC, a 12-bit DAC, two GP comparators, internal 8 KB SRAM and 64 KB Flash, touch sensing, CEC and SWD debugging support. The full range of hardware features on the board is able to help you evaluate all peripherals (motor control connector, RS-232, RS-485, audio DAC, linear sensor, microphone ADC, TFT LCD, IrDA, IR LED, IR receiver, LDR, MicroSD card, CEC on two HDMI connectors, RF E2PROM, temperature sensor and so on) and develop your own applications. Extension headers make it possible to easily connect a daughterboard or wrapping board for your specific application. An ST-LINK/V2 is integrated on the board as an embedded in-circuit debugger and programmer for the STM32 MCU.
圖3.STM320518-EVAL評估板外形圖 STM320518-EVAL評估板主要特性: ● Three 5 V power supply options: power jack, ST-LINK/V2 USB connector or daughterboard ● Audio speaker and microphone connected to DAC and ADC of STM32F051R8T6 ● 2 Gbyte or more SPI interface MicroSD card ● I2C compatible serial interface temperature sensor ● RF E2PROM ● RS-232 and RS-485 communication ● IrDA transceiver ● IR LED and IR receiver ● SWD debug support, ST-LINK/V2 embedded ● 240 x 320 TFT color LCD connected to SPI interface of STM32F051R8T6 ● Joystick with 4-direction control and selector ● Reset, tamper and user buttons ● 4 color LEDs ● Extension connector for daughterboard or wrapping board ● MCU voltage choice fixed at 3.3 V or adjustable from 2 to 3.6 V ● Linear sensor ● Light dependent resistor (LDR) ● Potentiometer ● Two HDMI connectors with DDC and CEC ● Motor control connector ● Boards RoHS compliant
圖4.STM320518-EVAL評估板硬件框圖
圖5.STM320518-EVAL評估板布局圖
圖6.STM320518-EVAL評估板電路圖(1)
圖7.STM320518-EVAL評估板電路圖(2)
圖8.STM320518-EVAL評估板電路圖(3)
圖9.STM320518-EVAL評估板電路圖(4)
圖10.STM320518-EVAL評估板電路圖(5)
圖11.STM320518-EVAL評估板電路圖(6)
圖12.STM320518-EVAL評估板電路圖(7)
圖13.STM320518-EVAL評估板電路圖(8)
圖14.STM320518-EVAL評估板電路圖(9)
圖15.STM320518-EVAL評估板電路圖(10)
圖16.STM320518-EVAL評估板電路圖(11)
圖17.STM320518-EVAL評估板電路圖(12)
圖18.STM320518-EVAL評估板電路圖(13)
圖19.STM320518-EVAL評估板電路圖(14) 詳情請見: 
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DM00052328.pdf
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