原标题：mbed NXP LPC11U24 32位MCU USB连接解决方案

　　nxp公司的LPC11U24FBD64是采用ARM Cortex-M0的低成本32位MCU,设计用于8/16位MCU应用,和现有的8/16位架构相比,提高了性能,降低了功耗,简化了制令集和存储器寻址,降低了代码长度,CPU工作频率高达50MHz,主要用于消费类电子外设,医疗设备,工业控制和USB音频设备.本文介绍了LPC11U24 主要特性和优势,方框图,自供电设备的USB接口连接图和mbed NXP LPC11U24 MCU模块电路图.

　　The LPC11U24FBD64 is a ARM Cortex-M0 based, low-cost 32-bit MCU, designed for 8/16-bit microcontroller applications, offering performance, low power, simple instruction set and memory addressing together with reduced code size compared to existing 8/16-bit architectures. The LPC11U24FBD64 operates at CPU frequencies of up to 50 MHz. Equipped with a highly flexible and configurable Full-Speed USB 2.0 device controller, the LPC11U24FBD64 brings unparalleled design flexibility and seamless integration to today’s demanding connectivity solutions.

　　LPC11U24 主要特性和优势:

　　ARM Cortex-M0 processor, running at frequencies of up to 50 MHz

　　ARM Cortex-M0 built-in Nested Vectored Interrupt Controller (NVIC)

　　Non-Maskable Interrupt (NMI) input selectable from several input sources

　　System tick timer

　　Up to 32 kB on-chip flash program memory

　　Up to 4 kB on-chip EEPROM data memory

　　Up to 10 kB SRAM data memory

　　16 kB boot ROM

　　In-System Programming (ISP) and In-Application Programming (IAP)

　　ROM-based USB drivers. Flash updates via USB supported

　　ROM-based 32-bit integer division routines

　　Standard JTAG (Joint Test Action Group) test interface

　　Serial Wire Debug

　　Up to 54 General-Purpose I/O (GPIO) pins

　　Up to 8 GPIO pins can be selected as edge and level sensitive interrupt sources

　　Two GPIO grouped interrupt modules

　　High-current source output driver (20 mA) on one pin

　　High-current sink driver (20 mA) on true open-drain pins

　　Four general-purpose counter/timers

　　Programmable Windowed WatchDog Timer (WWDT)

　　10-bit ADC with input multiplexing among eight pins

　　USB 2.0 full-speed device controller

　　USART (Universal Synchronous Asynchronous Receiver/Transmitter)

　　Two SSP (Synchronous Serial Port) controllers

　　I2C-bus interface supporting the full I2C-bus specification and Fast-mode Plus

　　Crystal Oscillator with an operating range of 1 MHz to 25 MHz

　　12 MHz high-frequency Internal RC oscillator (IRC)

　　Internal low-power, low-frequency WatchDog Oscillator (WDO)

　　PLL allows CPU operation up to the maximum CPU rate

　　A second, dedicated PLL is provided for USB

　　Clock output function with divider

　　Integrated PMU (Power Management Unit)

　　Power profiles residing in boot ROM

　　Four reduced power modes

　　Processor wake-up

　　Power-On Reset (POR)

　　Brownout detect with four separate thresholds for interrupt and forced reset

　　Unique device serial number for identification

　　Single 3.3 V power supply (1.8 V to 3.6 V)

　　Temperature range -40 ℃ to +85 ℃

　　LPC11U24 应用:

　　Consumer peripherals

　　Medical

　　Industrial control

　　Industrial control

　　USB audio devices

　　图1.LPC11U24 框图

　　图2.自供电设备的USB接口连接图

　　Rapid Prototyping for USB devices, battery applications and low-cost 32-bit ARM® Cortex™-M0 based designs

　　图3.mbed NXP LPC11U24 MCU模块外形图

　　The mbed NXP LPC11U24 Microcontroller in particular is designed for prototyping low cost USB devices, battery powered applications and 32-bit ARM® Cortex™-M0 based designs. It is packaged as a small DIP form-factor for prototyping with through-hole PCBs, stripboard and breadboard, and includes a built-in USB FLASH programmer.

　　图4.mbed NXP LPC11U24 MCU模块连接图