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• Customer Support • Document Revision History DOCUMENT LAYOUT This document describes how to use the MCP3903 ADC Evaluation Board for 16-Bit MCUs as a development tool to emulate and debug firmware on a target board. The manual layout is as follows: •...
MCP3903 ADC Evaluation Board for 16-Bit MCUs User’s Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions: DOCUMENTATION CONVENTIONS Description Represents Examples Arial font: ® Italic characters Referenced books MPLAB IDE User’s Guide Emphasized text ...is the only compiler...
Preface RECOMMENDED READING This User's Guide describes how to use MCP3903 ADC Evaluation Board for 16-Bit MCUs. Other useful documents are listed below. The following Microchip document is available and recommended as a supplemental reference resource: • MCP3903 Data Sheet - “Six Channel Delta Sigma A/D Converter”...
MCP3903 ADC EVALUATION BOARD FOR 16-BIT MCUs USER’S GUIDE Chapter 1. Hardware Description OVERVIEW The MCP3903 ADC Evaluation Board for 16-Bit MCUs system lets users evaluate the performance of the MCP3903 six-channel ADC. It also provides a development ® platform for 16-bit PIC MCU-based applications, using existing 100-pin PIM systems, compatible with the Explorer-16 and other high pincount PIC demo boards.
MCLR (for MCP3903 data mode setting). Output Capture 1 is used for MCP3903’s clock generation. Serial communication is achieved through the MSSP module 1. The MCP3903 device is an ADC with a second order modulator and a third order sync filter. This Delta-Sigma A/D converter has an adjustable oversampling ratio. The CLKIN pin of the MCP3903 is the ADC’s clock (MCLK) input.
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1.2.1 Using the Crystal X2 The MCP3903 ADC Evaluation Board for 16-Bit MCUs is populated with a 3.58 MHz crystal, being used as a clock source, by placing jumpers in the following position on the MCP3903 Digital I/O header block:...
PC. On the board, there is an MCP2200 USB to UART converter that creates a virtual COM port on the PC. The MCP3903 ADC Evaluation Board for 16-Bit MCUs also features a RS232 connector just in case it is required.
To transfer data from the ADC to the MCU, the SPI communication is controlled by DMA1. DMA1 channel is set up to use nul data write to read the MCP3903 register correctly. The DMA1 reads 7 bytes, but the first byte is not used. Before a new DMA read takes place, the CS pin must be controlled in the software and the MCU must wait for a new external interrupt 3 that indicates a new acquisition.
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MCP3903 ADC Evaluation Board for 16-Bit MCUs User’s Guide S ta r t In itia lis a tio n Initialization G e t s a m p le s in to b u ffe r [5 1 2 ] R e a d In te r n a l R e g is te rs...
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MCP3903 Data View Software - Registers and Settings Screen. From the Edit menu, the user can open the Registers and Settings window to control the internal registers of the MCP3903, the sampling speed of the ADC or if any averaging should be done on the acquired samples.
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MCP3903 ADC Evaluation Board for 16-Bit MCUs User’s Guide The Waveform Graphs will show the signal in Time domain, while the Signal Spectrum graphs shows the signal in Frequency domain. From the Graphs menu, under the Signal Spectrum option, the user can find the Switch Y-axis scale option. From here, it is possible to change the Y axis of the Signal Spectrum in linear scale or in logarithmic scale.
MCP3903 ADC EVALUATION BOARD FOR 16-BIT MCUs USER’S GUIDE Appendix A. Schematics and Layouts INTRODUCTION This appendix contains the following schematics of the MCP3903 ADC Evaluation Board for 16-Bit MCUs. • Schematic - Analog • Schematic - LCD and UART •...
MCP3903 ADC EVALUATION BOARD FOR 16-BIT MCUs USER’S GUIDE Appendix B. Bill of Materials (BOM) TABLE B-1: BILL OF MATERIALS (BOM) Reference Description Manufacturer Part Number C1,C4 CAP CER 10UF 16V Y5V 0805 TDK Corp. C2012Y5V1C106Z C11<>C22 CAP CER .10UF 25V X7R 10% 0603 TDK Corp.
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