關鍵詞： Microchip , PIC32MX , 音頻開發

Microchip公司的PIC32Mx系列32位MCU采用MIPS32® M4K® 32位RISC內核,具有5級流水線,最大工作頻率80MHz,它集成的MCU具有32K到512KB閃存,8KB-32KB SRAM,具有多個功率管理模式,引腳和大多數的PIC24/dsPIC® DSC兼容.器件集成了多種外設,其模擬特性包括多達16路的10位ADC和兩個模擬比較器.PIC32 MCU可用在從控制邏輯到集成系統等多種用處.而采用PIC32M的音頻開發板是24位音頻錄音和播放,USB數字音頻,MP3譯碼和取樣速率轉換的靈活平臺,可用在汽車信息娛樂和便攜式音頻設備.本文介紹了PIC32MX3XX/4XX主要特性,方框圖以及音頻開發板主要特性,主要元器件,電路圖和元件布局圖.

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! 32-bit PIC® microcontrollers are well suited for a wide variety of applications from control logic, to fully integrated systems involving USB, Ethernet and LCD.

PIC32MX3XX/4XX主要特性:

High-Performance, General Purpose and USB, 32-bit Flash Microcontrollers 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 0 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 temperature range of -40ºC to +105ºC

• Operating voltage range of 2.3V to 3.6V

• 32K to 512K Flash memory (plus an additional 12 KB of boot Flash)

• 8K to 32K 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 4-channel hardware DMA with automatic data size detection

• USB 2.0-compliant full-speed device and On-The-Go (OTG) controller

• USB has a dedicated DMA channel

• 3 MHz to 25 MHz crystal oscillator

• Internal 8 MHz and 32 kHz oscillators

• Separate PLLs for CPU and USB clocks

• Two I2C™ modules

• Two UART modules with:

- RS-232, RS-485 and LIN support

- IrDA® with on-chip hardware encoder and decoder

• Up to two SPI modules

• 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 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:

- 1000 ksps conversion rate

- Conversion available during Sleep, Idle

• Two Analog Comparators

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圖1. PIC32MX3XX/4XX系列方框圖

音頻開發板

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.

音頻開發板主要特性:

- On-board PIC32MX795F512 with 80 MIPS of performance, 512KB Flash and 128KB of RAM

- 24-bit Wolfson CODEC

- USB Type A interface

- On-board Microphone

- Headphone out and Line in

- High quality 2” Color LCD

- Pre-loaded demo code

- MFi Dock Edge Connector

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圖2. PIV32 MCU音頻開發板外形圖
音頻開發板元件描述:

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圖3.音頻開發板電路圖:顯示器電路

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圖4.音頻開發板電路圖:音頻電路

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圖5.音頻開發板電路圖:MCU和USB電路

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圖6.音頻開發板電路圖:電源電路

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圖7.音頻開發板電路圖:通信電路(擴展連接器,ICSP,開關和LED)

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圖8.音頻開發板布局圖
詳情請見:

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