Audio Development Board User’s Guide © 2011 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
AUDIO DEVELOPMENT BOARD USER’S GUIDE Table of Contents Preface ........................................................................................................................... 5 Chapter 1. Introduction 1.1 Overview ...................................................................................................... 11 Chapter 2. Hardware 2.1 Power Supply ............................................................................................... 13 2.2 Microcontroller .......................
Audio Development Board User’s Guide NOTES: DS70662A-page 4 © 2011 Microchip Technology Inc.
AUDIO DEVELOPMENT BOARD USER’S GUIDE Preface NOTICE TO CUSTOMERS All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available. Documents are identified with a “DS” number.
Audio Development Board User’s Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions: DOCUMENTATION CONVENTIONS Description Represents Examples Arial font: Italic characters Initial caps Referenced books MPLAB® IDE User’s Guide Emphasized text ...is the only compiler...
Preface RECOMMENDED READING This user’s guide describes how to use the Audio Development Board. The following Microchip documents are available and recommended as supplemental reference resources. MPLAB® C Compiler for PIC24 MCUs and dsPIC® DSCs User’s Guide (DS51284) This document helps you use Microchip’s 16-bit C compilers to develop your application.
Audio Development Board User’s Guide THE MICROCHIP WEB SITE Microchip provides online support via our web site at: http://www.microchip.com. This web site makes files and information easily available to customers.
Preface DOCUMENT REVISION HISTORY Revision A (May 2011) This is the initial release of the Audio Development Board User’s Guide. © 2011 Microchip Technology Inc.
Audio Development Board User’s Guide NOTES: DS70662A-page 10 © 2011 Microchip Technology Inc.
AUDIO DEVELOPMENT BOARD USER’S GUIDE Chapter 1. Introduction Thank you for purchasing an Audio Development Board from Microchip Technology Inc. The Audio Development Board showcases a 16/32-bit audio development platform with a true 24-bit audio codec. In addition, the board also showcases the performance of PIC32 MCU/dsPIC33E DSC for complex audio algorithms. 1.
Audio Development Board User’s Guide TABLE 1-1: Item Number AUDIO DEVELOPMENT BOARD COMPONENT DESCRIPTIONS Component Label Description 1 J1 9V DC power connector. 2 U2 Microcontroller. 3 U1 Wolfson WM8960 audio codec. 4 J2 PICtail Plus Connector for iPod® PICtail™ Plus Board. 5 LCD1 6 J7 USB interface connector. J10 RS-232 serial UART connector. 7 8 2-inch (220x176) TFT display. S1, S2, S3, S4 General purpose user application switches.
AUDIO DEVELOPMENT BOARD USER’S GUIDE Chapter 2. Hardware This chapter provides a functional overview of the hardware used in the Audio Development Board and identifies the major hardware components. Topics covered include: • • • • • • • • 2.1 Power Supply Microcontroller Audio Codec, Microphone and Audio Connections PICtail™ Plus Connector TFT Display USB Connectivity UART Connectivity User LEDs and Switches POWER SUPPLY Power can be supplied to the Audio Development Board through the DC connector (J1).
Audio Development Board User’s Guide 2.3 AUDIO CODEC, MICROPHONE AND AUDIO CONNECTIONS The audio codec (U1) is a Wolfson WM8960. The codec is of hi-fi quality with up to 24-bit resolution. The sampling rates supported are between 8 kHz to 48 kHz and includes an on-chip flexible PLL. The codec has a built-in headphone driver and a stereo Class D speaker driver. In addition, it has low-power consumption and offers a small foot print.
Hardware 2.7 UART CONNECTIVITY The RS-232 Serial port (J10) provides a general purpose serial communication port for application use. The MAX3232CUE (U4) RS-232 transceiver provides the required translation level and connects to a UART on the MCU (U2). 2.8 USER LEDS AND SWITCHES The general purpose LEDs, D3, D4, and D5, are available for application use. The LEDs are connected to the MCU (U2) output ports. Setting the port high will activate the LED.
Audio Development Board User’s Guide NOTES: DS70662A-page 16 © 2011 Microchip Technology Inc.
AUDIO DEVELOPMENT BOARD USER’S GUIDE Appendix A. Schematics and Board Layout A.1 AUDIO DEVELOPMENT BOARD SCHEMATICS FIGURE A-1: DISPLAY CIRCUIT +3.3V_DIG +3.3V_DIG © 2011 Microchip Technology Inc. R18 6.8ohms R17 R19 6.8ohms 0R R20 6.
AUDIO CIRCUIT +3.3V_DIG C16 C15 0.1uF 0.1uF U1 +3.3V_ANA C18 4.7uF +3.3V_ANA +3.3V_ANA C17 4.7uF C19 0.1uF J6 C20 4.7uF +3.3V_DIG C21 100uF C23 2.2K C27 10uF 10uF R7 +3.3V_DIG R8 4.7K R9 4.7K WM8960_QFN32 © 2011 Microchip Technology Inc. J5 R3 5.6K 5.6K R5 C11 R4 5.6K R6 5.
© 2011 Microchip Technology Inc. FIGURE A-3: MICROCONTROLLER AND USB CIRCUITS +3.3V_DIG +3.3V_DIG R23 R24 0 ohms 0 ohms C44 Y2 18pF 8Mhz +3.3V_DIG +3.3V_DIG C45 18pF C28 0.1uF R22 R21 0 ohms 0 ohms +3.3V_DIG C37 1uF +3.3V_DIG +3.3V_DIG +3.3V_DIG DS70662A-page 19 C39 1uF C41 1uF USB-Type A C30 100uF C43 1uF C42 1uF Schematics and Board Layout +3.
POWER CIRCUITS +3.3V_DIG VR2 VR1 +9V LM1117MPX-3.3 LM1117MP-5.0 C2 C3 C4 0.1uF 10uF 1uF C1 1uF +9V +3.3V_ANA C5 C6 10uF 0.1uF Power R25 +3.3V_DIG C7 C9 C8 1UF 0.1uF 10uF 0R R1 470R D2 © 2011 Microchip Technology Inc. +3.3V_DIG +3.3V_DIG +3.3V_DIG +3.3V_DIG +3.3V_DIG C24 C25 C26 C29 C35 0.1uF 0.1uF 0.1uF 10uF 0.1uF +3.3V_DIG C36 0.1uF +3.3V_DIG C38 0.1uF +3.3V_DIG C46 0.1uF +3.3V_DIG C47 0.1uF C48 0.
Schematics and Board Layout FIGURE A-5: COMMUNICATION CIRCUITS (EXPANSION CONNECTOR, ICSP, SWITCHES, AND LEDs) +3.3V_DIG R2 J3 +3.3V_DIG DNP MCLR 1 2 VDD 3 VSS PGD 4 PGC C10 0.1uF 5 N.C. 6 RJ11_6PIN ICSP +3.3V_DIG R16 RESET1 3 4 10K 1 2 C34 0.1uF R10 470R R11 470R R12 470R D3 D4 D5 LEDs +3.3V_DIG S3 3 4 1 2 R15 10K +3.3V_DIG S4 3 4 1 2 C33 C40 0.1uF 0.1uF +3.3V_DIG +3.3V_DIG R13 10K S1 3 4 1 2 R27 10K S2 3 4 1 2 C31 0.1uF R14 10K C32 0.
DS70662A-page 22 FIGURE A-6: BOARD LAYOUT (TOP) Audio Development Board User’s Guide AUDIO DEVELOPMENT BOARD LAYOUT A.2 © 2011 Microchip Technology Inc.
NOTES: © 2011 Microchip Technology Inc.
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