Microchip Technology MCP3421 SOT23-6, Руководство пользователя

Страница: 9 / 35

MCP3421 SOT23-6 EVALUATION
BOARD USER’S GUIDE
©
2009 Microchip Technology Inc. DS51793A-page 5
Chapter 1. Quick Start Instructions
1.1 INTRODUCTION
The following sections provide an overview of the MCP3421 SOT23-6 Evaluation
Board and demonstrate how to use it with the PICkit™ Serial Analyzer
(P/N: DV164122).
The following topics are covered:
• Description of the MCP3421 SOT23-6 Evaluation Board
• Using MCP3421 SOT23-6 Evaluation Board with the PICkit Serial Analyzer to
evaluate the MCP3421 device
1.2 DESCRIPTION OF THE MCP3421 SOT23-6 EVALUATION BOARD
The MCP3421 SOT23-6 Evaluation Board (P/N MCP3421EV) contains a MCP3421
18-bit Delta-Sigma Analog-to-Digital Converter (ADC). The MCP3421 is an 18-bit
single channel ADC device with various options. The MCP3421 SOT23-6 Evaluation
Board has analog input connection pads and V
DD
, SDA, and SCL test pads. The user
can connect any sensor input signal to this evaluation board and test the ADC
conversion results. The PICkit Serial Analyzer’s PC graphic user interface (GUI)
provides the user’s interface for writing configuration register bits of the MCP3421 and
displays the ADC conversion values. The PICkit Serial Analyzer links between the GUI
and the MCP3421 SOT23-6 Evaluation Board, and provides the I
2
C communication
PC to the MCP3421 SOT23-6 Evaluation Board. The user also can use this MCP3421
SOT23-6 Evaluation Board without the PICkit Serial Analyzer by providing the I
2
C
communication signal to the SDA and SCL test pads on the board.
This evaluation board has the following interface:
• PICkit Serial Analyzer (P/N: DV164122) for writing configuration register bits and
reading the conversion data.
The user can monitor the I
2
C communications by connecting an oscilloscope to the
SDA and SCL test pads. Refer to Appendix A. “Schematic and Layouts” .
1.2.1 I
2
C Address Bits
The I
2
C device code and address bits of the MCP3421 device on this board are
“1101000”. These bits are programmed at the factory during production.
Note: The user can use this board without the PICkit Serial Analyzer as long as
the V
DD
, SCL, and SDA are provided to the board. This evaluation board
does not include MCU.