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MCP4XXX DIGITAL POTENTIOMETER
DAUGHTER BOARD USER ’S GUIDE
Chapter 1. Product Overview
1.1
1.2
INTRODUCTION
This chapter provides an overview of the MCP4XXX Digital Potentiometer Daughter
Board and covers the following topics:
? What is the MCP4XXX Digital Potentiometer Daughter Board?
? What the MCP4XXX Digital Potentiometer Daughter Board kit includes
WHAT IS THE MCP4XXX DIGITAL POTENTIOMETER DAUGHTER BOARD?
The MCP4XXX Digital Potentiometer Daughter Board allows the system designer to
quickly evaluate the operation of Microchip Technology’s MCP42XXX and MCP4021
Digital Potentiometers. The MCP42XXX are dual Digital Potentiometer devices that
have the same characteristics as their single Digital Potentiometer devices
(MCP41XXX). The MCP4021 devices are non-volatile devices that have similar
characteristics as their volatile memory versions (MCP4011). The board supports two
MCP42XXX devices to allow the Resistor Networks to be “stacked” and form a
programmable windowed Digital Potentiometer and an MCP4021 device, which can be
replaced with an MCP4011 device. The board has one MCP42010 device (10 k Ω ),
which can be the rheostats at the ends, and one MCP42010 device (10 k Ω ) which is
the potentiometer in the middle and a separate standalone potentiometer.
The board also has an MCP4021-103 (10 k Ω ) device for evaluation. The
characteristics of this device is similar to the other MCP402X devices. The MCP4021
footprint (SOIC) is the same as the MCP4011 device. The MCP4021 can be removed
and replaced with an MCP4011. The MCP4021 can be jumpered into the middle
potentiometer configuration to compare the characteristics of the MCP42XXX device
to the MCP4011/MCP4021 device.
The board also has a voltage doubler device (TC1240A), which can be used to show
the WiperLock? Technology feature of the MCP4021.
The MCP4XXX Digital Potentiometer Daughter Board has been made configurable, via
jumpers. This allows you to determine the configuration that you wish to have the four
digital potentiometer of the MCP42XXX devices.
Some of the features include:
? Header to interface to PICDEM? boards using 28-pin header, including
- PICDEM? HPC Explorer Demo Board
- PICDEM? FS USB Demo Board
- PICDEM? 2 Plus Demo Board (Rev 5 or later)
- PICDEM? LCD
? TC1240A Voltage Doubler to generate V IHH voltage for WiperLock Technology
evaluation
? Jumpers for configuration of U1-Pot0, U2-Pot0, and U2-Pot1 terminal connections
? Jumpers for MCP4021 Pot (A, W, and B) to replace U1-Pot0 in desired circuit
? Jumpers for routing signals (SI, SO, SCK, and CS) from either a PICDEM HPC
Demo board or a PICDEM FS USB Demo Board
? Pads for easy connection to the Digital Potentiometer signals, including the
Resistor Network Terminals and the Serial Interface signals
? 2006 Microchip Technology Inc.
DS51621A-page 5
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