Microchip公司的PIC32系列MCU采用5级流水线MIPS32® M4K® 32位内核,工作频率80MHz,在零等待状态闪存接入时的性能为1.56 DMIPS/MHz (Dhrystone 2.1), MCU工作电压2.3V- 3.6V,具有众多的外设,有两个编程和调试接口,多达16路10位ADC和两个模拟比较器,主要用于超小型图像/用户接口,以太网/USB/CAN/连接,多任务嵌入控制和高性能音频.本文介绍了PIC32 MCU主要特性,方框图,以及PIC32音频开发板主要特性及主要元件,电路图和PCB布局图.
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!

PIC32 MCU主要特性:
High-Performance 32-bit RISC CPU:
• MIPS32® M4K® 32-bit core with 5-stage pipeline
• 80 MHz maximum frequency
• 1.56 DMIPS/MHz (Dhrystone 2.1) performance at zero Wait state Flash access
• Single-cycle multiply and high-performance divide unit
• MIPS16e® mode for up to 40% smaller code size
• Two sets of 32 core register files (32-bit) to reduce interrupt latency
• Prefetch Cache module to speed execution from Flash
Microcontroller Features:
• Operating voltage range of 2.3V to 3.6V
• 64K to 512K Flash memory (plus an additional 12 KB of Boot Flash)
• 16K to 128K SRAM memory
• Pin-compatible with most PIC24/dsPIC® DSC devices
• Multiple power management modes
• Multiple interrupt vectors with individually programmable priority
• Fail-Safe Clock Monitor mode
• Configurable Watchdog Timer with on-chip Low-Power RC oscillator for reliable operation Peripheral Features:
• Atomic SET, CLEAR and INVERT operation on select peripheral registers
• Up to 8-channels of hardware DMA with automatic data size detection
• USB 2.0-compliant full-speed device and
On-The-Go (OTG) controller:
- Dedicated DMA channels
• 10/100 Mbps Ethernet MAC with MII and RMII interface:
Dedicated DMA channels
• CAN module:
- 2.0B Actie with DeviceNet™ addressing support
- Dedicated DMA channels
• 3 MHz to 25 MHz crystal oscillator
Peripheral Features (Continued):
• Internal 8 MHz and 32 kHz oscillators
• Six UART modules with:
- RS-232, RS-485 and LIN support
- IrDA® with on-chip hardware encoder and decoder
• Up to four SPI modules
• Up to five I2C™ modules
• Separate PLLs for CPU and USB clocks
• Parallel Master and Slave Port (PMP/PSP) with 8-bit and 16-bit data, and up to 16 address lines
• Hardware Real-Time Clock and Calendar (RTCC)
• Five 16-bit Timers/Counters (two 16-bit pairs combine to create two 32-bit timers)
• Five Capture inputs
• Five Compare/PWM outputs
• Five external interrupt pins
• High-speed I/O pins capable of toggling at up to 80 MHz
• High-current sink/source (18 mA/18 mA) on all I/O pins
• Configurable open-drain output on digital I/O pins
Debug Features:
• Two programming and debugging Interfaces:
- 2-wire interface with unintrusive access and real-time data exchange with application
- 4-wire MIPS® standard enhanced Joint Test Action Group (JTAG) interface
• Unintrusive hardware-based instruction trace
• IEEE Standard 1149.2 compatible (JTAG) boundary scan
Analog Features:
• Up to 16-channel, 10-bit Analog-to-Digital Converter:
- 1 Msps conversion rate
- Conversion available during Sleep and Idle
• Two Analog Comparators

PIC32 MCU主要应用:
High Impact Graphics/User Interfaces
Ethernet/USB/CAN/Connectivity
Multitasking Embedded Control
High Performance Audio


图1.PIC32 MCU方框图

PIC32音频开发板
Audio Development Board
The audio development board for PIC32 (DM320011) provides developers a flexible platform for 24-bit audio record and playback, USB Digital Audio, MP3 Decode and Sample Rate Conversion. The board also provides an interface to Microchip’s 16/32-bit PIC® MCU Accessory Development Platform for iPod and iPhone enabling Apple® authorized MFi licensees.

PIC32音频开发板主要特性:
• High-performance MCU
• Wolfson WM8960 audio codec with up to 48 kHz sampling rate and up to 24-bit resolution
• Headphone out, Line-in jacks, and an on-board MIC
• TFT color display with 220x176 resolution
• PICtail™ Plus Connector
• General purpose user switches and LEDs

图2.音频开发板外形图和元件分布图
音频开发板元件表:


图3.音频开发板电路图:显示电路

图4.音频开发板电路图:音频电路

图5.音频开发板电路图:MCU和USB电路


图6.开发板电路图:电源电路

图7.音频开发板电路图:通信电路(扩展连接器,ICSP,开关和LED)

图8.音频开发板PCB布局图:顶层