User manual

MCP401X/2X EVALUATION

BOARD USER’S GUIDE

Chapter 2. Installation and Operation

2.1 INTRODUCTION

The MCP402X Digital Potentiometer Evaluation Board provides a tested,

out-of-the-box example of a MCP401X/2X application. The circuit description is

described in Section 2.2 “PCB Description”, while the test and operating instructions

are described in Section 2.3 “Test and Operating Instructions”. A supplied blank

PCB allows rapid prototyping of the designer’s specific MCP401X/2X device, along

with other desired passive components (resistor and capacitors) and connection posts.

2.2 PCB DESCRIPTION

The MCP402X Digital Potentiometer Evaluation Board has the following features:

• 150 mil, 8-pin SOIC pinout (U1) supports the MCP4021 and MCP4011 devices

• SOT-23-6 pinout (U2) supports the MCP4022/23/24 and MCP4012/13/14 devices

• SOT-23-6 pinout (U3) supports the PIC10F20X devices

• Connection terminals can be left unpopulated for easy connection using small

alligator clip leads (clamped across the edge of the board) or populated with either

through-hole or surface-mount terminals

• Footprints for optional passive components for:

- Power supply filtering

- Device bypass capacitor

- Terminal “A” pull-up resistor

- Terminal “B” pull-down resistor

• Footprints for two switches:

- INCR button operation can be detected by the PIC10F20X to generate

Increment commands (move wiper toward terminal A)

- DECR button operation can be detected by the PIC10F20X to generate

Decrement commands (move wiper toward terminal B)

• Button sequence instructions are printed on the back of the PCB

Appendix A.2 “Schematic” illustrates the schematic for the MCP402XEV.

Note: The PIC10F20X firmware (00066_MCP402XEV.HEX) must be

programmed into the microcontroller before the MCP402XEV is functional.