原标题：Microchip PIC32MX 32位MCU多媒体扩展板解决方案

　　Microchip公司的多媒体扩展板(MEB)采用PIC32系列32位MCU,为PIC32入门板用户,dsPIC33E或PIC24E USB入门板用户提供了灵活解决方案,以开发更高级用户接口.MEB集成了3.2 Color TFT触摸屏QVGA显示器,FCC认证WiFi模块,24位立体声音频代码,三轴加速度计,操纵杆和MicroSD存储器卡插槽,简便和DM320001, DM320003-2, DM320004, DM330012 以及DM240012入门板连接,可用于图像/用户接口,以太网/USB/CAN连接,多任务嵌入式控制以及高性能音频.本文介绍了PIC32MX主要特性,方框图,多媒体扩展板(MEB)主要特性,方框图,电路图,材料清单和PCB元件布局图.

　　PIC32MX1XX/2XX:32-bit Microcontrollers (up to 128 KB Flash and 32 KB SRAM) with Audio and Graphics Interfaces, USB, and Advanced Analog

　　Microchip’s 32-bit portfolio with the MIPS® M4K® offers high performance microcontrollers, and all the tools needed to develop your embedded project. With free software, low cost development tools, and pin/peripheral compatibility from 16-bit product lines, PIC32 MCUs shorten time to market and allow your designs to grow. PIC32 gives your application the processing power, memory and peripherals your design needs!

　　PIC32MX主要特性:

　　Operating Conditions

　　• 2.3V to 3.6V, -40ºC to +105ºC, DC to 40 MHz

　　Core: 40 MHz MIPS32® M4K®

　　• MIPS16e® mode for up to 40% smaller code size

　　• 1.56 DMIPS/MHz (Dhrystone 2.1) performance

　　• Code-efficient (C and Assembly) architecture

　　• Single-cycle (MAC) 32x16 and two-cycle 32x32 multiply

　　Clock Management

　　• 0.9% internal oscillator

　　• Programmable PLLs and oscillator clock sources

　　• Fail-Safe Clock Monitor (FSCM)

　　• Independent Watchdog Timer

　　• Fast wake-up and start-up

　　Power Management

　　• Low-power management modes (Sleep, Idle)

　　• Integrated Power-on Reset and Brown-out Reset

　　• 0.5 mA/MHz dynamic current (typical)

　　• 20 μA IPD current (typical)

　　Audio Interface Features

　　• Data communication: I2S, LJ, RJ, DSP modes

　　• Control interface: SPI and I2C™

　　• Master clock:

　　- Generation of fractional clock frequencies

　　- Can be synchronized with USB clock

　　- Can be tuned in run-time

　　Advanced Analog Features

　　• ADC Module:

　　- 10-bit 1.1 Msps rate with one S&H

　　- Up to 10 analog inputs on 28-pin devices and 13 analog inputs on 44-pin devices

　　• Flexible and independent ADC trigger sources

　　• Charge Time Measurement Unit (CTMU):

　　- Supports mTouch™ capacitive touch sensing

　　- Provides high-resolution time measurement (1 ns)

　　- On-chip temperature measurement capability

　　• Comparators:

　　- Up to three Analog Comparator modules

　　- Programmable references with 32 voltage points

　　Timers/Output Compare/Input Capture

　　• Five General Purpose Timers:

　　- Five 16-bit and up to two 32-bit Timers/Counters

　　• Five Output Compare (OC) modules

　　• Five Input Capture (IC) modules

　　• Peripheral Pin Select (PPS) to allow function remap

　　• Real-Time Clock and Calendar (RTCC) module

　　Communication Interfaces

　　• USB 2.0-compliant Full-speed OTG controller

　　• Two UART modules (10 Mbps)

　　- Supports LIN 2.0 protocols and IrDA® support

　　• Two 4-wire SPI modules (20 Mbps)

　　• Two I2C modules (up to 1 Mbaud) with SMBus support

　　• Peripheral Pin Select (PPS) to allow function remap

　　• Parallel Master Port (PMP)

　　Direct Memory Access (DMA)

　　• Four channels of hardware DMA with automatic data size detection

　　• Two additional channels dedicated for USB

　　• Programmable Cyclic Redundancy Check (CRC)

　　Input/Output

　　• 15 mA source/sink on all I/O pins

　　• 5V-tolerant pins

　　• Selectable open drain, pull-ups, and pull-downs

　　• External interrupts on all I/O pins

　　Qualification and Class B Support

　　• AEC-Q100 REVG (Grade 2 -40ºC to +105ºC) planned

　　• Class B Safety Library, IEC 60730

　　Debugger Development Support

　　• In-circuit and in-application programming

　　• 4-wire MIPS® Enhanced JTAG interface

　　• Unlimited program and six complex data breakpoints

　　• IEEE 1149.2-compatible (JTAG) boundary scan

　　PIC32MX应用:

　　High Impact Graphics/User Interfaces

　　Ethernet/USB/CAN/Connectivity

　　Multitasking Embedded Control

　　High Performance Audio

　　图1.PIC32MX方框图

　　多媒体扩展板(MEB)

　　This compact, highly versatile board can be connected to any PIC32 starter kit for the purpose of developing multimedia applications, such as audio, graphics and touch screen.

　　The Multimedia Expansion Board (MEB) provides PIC32 Starter Kit, dsPIC33E USB Starter Kit or PIC24E USB Starter Kit users with an integrated yet flexible solution for development of high impact user interfaces. The board comes with a 3.2 Color TFT touch-screen QVGA display, an onboard FCC certified WiFi module, a 24-bit stereo audio code, a three-axis accelerometer, a joystick and a MicroSD memory card slot. Simply connect any DM320001, DM320003-2, DM320004, DM330012 and DM240012 Starter Kit to the MEB and you’re ready to develop, program and debug code for the user interface features. Demo software for the MEB may be downloaded below and is also contained within the Microchip Application Library, including software for the joystick, accelerometer, CPLD and more.

　　多媒体扩展板(MEB)正面特性包括:

　　1. 3.2 inch (8.1 cm) QVGA touch screen display with backlight.

　　2. Five user-controlled LEDs.

　　3. Four-way joystick (S2).

　　4. Fire button (S1).

　　5. Headphone jack.

　　6. Line output jack.

　　7. Microphone input jack.

　　8. Power LED.

　　9. I/O expansion connector

　　多媒体扩展板(MEB)背面特性包括:

　　1. Solomon Systech Graphics Controller (SSD1926).

　　2. microSD card slot.

　　3. Regulated 3.3V and 1.8V power supply for powering the board via a starter kit or

　　9-14V power supply.

　　4. Accelerometer and temperature sensor (BMA150).

　　5. 24LC08 EEPROM.

　　6. 2 MB SPI Flash (SST25VF016).

　　7. 24-bit stereo audio codec (WM8731).

　　8. CPLD for SPI and Chip Select configuration.

　　9. PIC32 starter kit connector.

　　10. Integrated 802.11 wireless connectivity.

　　图2.多媒体扩展板(MEB)背面元件分布图

　　多媒体扩展板(MEB)材料清单: