MCP4XXX Digital Potentiometer Daughter Board User’s Guide © 2006 Microchip Technology Inc.
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MCP4XXX DIGITAL POTENTIOMETER DAUGHTER BOARD USER’S GUIDE Table of Contents Preface ............................................................................................................................ 1 Chapter 1. Product Overview ........................................................................................ 5 1.1 Introduction ..................................................................................................... 5 1.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide NOTES: DS51621A-page iv © 2005 Microchip Technology Inc.
MCP4XXX DIGITAL POTENTIOMETER DAUGHTER 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.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions: DOCUMENTATION CONVENTIONS Description Arial font: Italic characters Represents Examples MPLAB® IDE User’s Guide ...is the only compiler... Referenced books Emphasized text RECOMMENDED READING Table 1-1 shows the device and associated data sheet literature number. These documents can be downloaded from the Microchip web site at: www.microchip.com.
Preface THE MICROCHIP WEB SITE Microchip provides online support via our web site at www.microchip.com. This web site is used as a means to make files and information easily available to customers.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide NOTES: DS51621A-page 4 © 2006 Microchip Technology Inc.
MCP4XXX DIGITAL POTENTIOMETER DAUGHTER BOARD USER’S GUIDE Chapter 1. Product Overview 1.1 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 1.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide 1.3 WHAT THE MCP4XXX DIGITAL POTENTIOMETER DAUGHTER BOARD KIT INCLUDES This MCP4XXX Digital Potentiometer Daughter Board Kit includes: • MCP4XXX Digital Potentiometer Daughter Board • Analog and Interface Products Demonstration Boards CD-ROM (DS21912) - MCP4XXX Digital Potentiometer Daughter Board User’s Guide DS51621A-page 6 © 2006 Microchip Technology Inc.
MCP4XXX DIGITAL POTENTIOMETER DAUGHTER BOARD USER’S GUIDE Chapter 2. Installation and Operation 2.1 INTRODUCTION This daughter board allows evaluation of digital potentiometer devices in different circuit configurations. The board supports the MCP42XXX devices and the MCP4011/MCP4021 devices. This board is intended to be “plugged into” the 28-pin header of the PICDEM™ Demo Boards. The board may also be “jumpered” into a desired application circuit. 2.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide 2.3 GETTING STARTED The MCP4XXX Digital Potentiometer Daughter Board is a board that allows the Digital Potentiometer circuit to be configured in many forms for evaluation of the device. The Resistor Network Circuit is shown in Figure 2-1 and shows the possible configurations that the demo board supports. The passive components use the surface-mount 805 package layout. Figure 2-2 shows the board circuit.
Installation and Operation FIGURE 2-2: © 2006 Microchip Technology Inc. MCP4XXX Digital Potentiometer Daughter Board Circuit.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide 2.3.1 The Hardware Figure 2-2 shows the layout of the MCP4XXX Digital Potentiometer Daughter Board. This is a small two-layer board (2.25" x 2.517" (57.2 mm x 63.9 mm)). There are sixteen connection points/pads that can use either through-hole or surface-mount connector posts and two through hole connections for power/ground. The connections to the SPI signals can be via the center taps of the JMP2 (SCK/SCL), JMP3 (SDO), and JMP4 (SDI/SDA) jumpers.
Installation and Operation 2.3.1.1 JUMPERS Figure 2-3 through Figure 2-6 show the function of the demo board jumpers. Some of the jumpers configure the interface connections, while other configure the resistor network configuration.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide JMP6 - CS0 Source JMP1 - CS0 Destination JMP5 - CS1 Source TC1240A VOUT (for H.V. Commands) JMP6 selection connects to U3 TC1240A VOUT (for H.V. Commands) PICDEM Header - H3 (RC1) JMP6 selection connects to U1 PICDEM Header - H3 (RE2) FIGURE 2-4: DS51621A-page 12 Jumper JMP1, JMP5, and JMP6 Configurations. © 2006 Microchip Technology Inc.
Installation and Operation JP11, JP12, & JP13 U3 Pot NOT connected to U1 Pot0 U3 Pot connected to U1 Pot0 U3-A → U1-P0A U3-W → U1-P0W U3-B → U1-P0B (typically device in U1 is removed for this configuration) FIGURE 2-5: JP7 JP9:JP10 - U1 Pot0 to U2 Pots JMP4 SDO selection is connected to U2-SI pin and U1-SO signal goes to U5-1 (input to 2-input OR gate) U1 Serial Out (SO) connected to U2 Serial In (SI) (U2 “daisy chained” to U1) U1 Pot0 NOT connected to U2 Pots U1 Pot0 connected to U2 Pots: U1-P0W → U2
MCP4XXX Digital Potentiometer Daughter Board User’s Guide JP3, JP5, JP6 JP1, JP2, JP4 JP6 - U2-P1W is floating (or pulled to VDD via R16) JP5 - U2-P1B not connected to U2-P1W JP3 - U2-P1A is floating (or pulled to VDD via R2) JP4 - U2-P0A is floating (or pulled to VDD via R3) JP2 - U2-P0B is floating (or pulled to VSS via R1) JP1 - U2-P0W not connected to U2-P0B JP6 - U2-P1W is connected to VDD JP5 - U2-P1B not connected to U2-P1W JP3 - U2-P1A is connected to VDD JP4 - U2-P0A is connected to VDD JP2 -
Installation and Operation 2.3.1.2 PASSIVE COMPONENTS Table 2-1 shows the optional passive components (resistors) that are by default not populated. Use the schematic to determine which resistors and values are required for your custom configuration. TABLE 2-1: OPTIONAL PASSIVE COMPONENTS Device Comment R2, R3, R5, R7, R9, R10, R13, R15, R16 Pull-up resistor R1, R4, R11, R12, R14 Pull-down resistor R20, R21 In-line resistor.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide 2.4 MCP4XXX DIGITAL POTENTIOMETER DAUGHTER BOARD DESCRIPTION The MCP4XXX Digital Potentiometer Daughter Board PCB is designed to be flexible in the type of device evaluation that can be implemented. The following sections describe each element of this evaluation board in further detail. 2.4.1 Power and Ground The MCP4XXX Digital Potentiometer Daughter Board receives its power over the J3 header connector.
Installation and Operation 2.5 DEMO WITH PICDEM DEMO BOARD There is one demo for this daughter board. The demo has an assembly versions for the PICDEM HPC Explorer Demo Board and the PICDEM FS USB Demo Board. The following hardware is required for this demo: • • • • PC with MPLAB-IDE installed ICD 2 PICDEM HPC Explorer Demo Board (and power supply) 4 Channel oscilloscope Note: An oscilloscope with fewer channels can be used, but this will reduce the information that can be displayed.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide Channel 4 Channel 2 Channel 1 Channel 3 FIGURE 2-8: DS51621A-page 18 Demo Jumper Configuration for use with PICDEM HPC Explorer Demo Board. © 2006 Microchip Technology Inc.
Installation and Operation Channel 4 Channel 2 Channel 1 Channel 3 FIGURE 2-9: Demo Jumper Configuration for use with PICDEM FS USB Demo Board. © 2006 Microchip Technology Inc.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide FIGURE 2-10: DS51621A-page 20 Screen Capture of P0W and P1W Output Waveforms. © 2006 Microchip Technology Inc.
Installation and Operation 2.5.1 Using the PICDEM HPC Explorer Demo Board Note: For information on how to use MPLAB-IDE, ICD 2, or any other aspect of the PICmicro Development tool platform, please refer to the appropriate documentation. Table 2-2 shows the sequence of steps to demonstrate the MCP4XXXDM-DB board (as shipped) with the PICDEM HPC Explorer Demo Board.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide 2.5.2 Using the PICDEM FS USB Demo Board Note: For information on how to use MPLAB-IDE, ICD 2, or any other aspect of the PICmicro Development tool platform, please refer to the appropriate documentation. Table 2-3 shows the sequence of steps to demonstrate the MCP4XXXDM-DB board (as shipped) with the PICDEM FS USB Demo Board.
MCP4XXX DIGITAL POTENTIOMETER DAUGHTER BOARD USER’S GUIDE Appendix A. Schematics and Layouts A.1 INTRODUCTION This appendix contains the schematics and layouts for the MCP4XXX Digital Potentiometer Daughter Board. Diagrams included in this appendix: • Board Schematic - Digital Circuitry • Board - Top Layer A.2 SCHEMATICS AND PCB LAYOUT Figure A.3 shows the schematic of the MCP4XXX Digital Potentiometer Daughter Board. Figure A.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide BOARD SCHEMATIC - DIGITAL CIRCUITRY M A.3 DS51621A-page 24 © 2006 Microchip Technology Inc.
Schematics and Layouts A.4 TOP LAYER AND SILK SCREEN © 2006 Microchip Technology Inc.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide A.5 TOP LAYER DS51621A-page 26 © 2006 Microchip Technology Inc.
Schematics and Layouts A.6 BOTTOM LAYER © 2006 Microchip Technology Inc.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide A.7 TOP COMPONENTS AND SILK SCREEN DS51621A-page 28 © 2006 Microchip Technology Inc.
MCP4XXX DIGITAL POTENTIOMETER DAUGHTER BOARD USER’S GUIDE Appendix B. Bill Of Materials (BOM) TABLE B-1: Qty BILL OF MATERIALS — INSTALLED COMPONENTS Reference Description Manufacturer ® Part Number 4 C1, C2, C3, C4 Device Power Supply Bypass Capacitor Surface-mount (805 package) CAP .1UF 16V CERAMIC X7R 0805 Panasonic ECG ECJ-2VB1C104K 1 C5 TC1240A Charge Double capacitor Surface-mount (805 package) CAP 3.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide TABLE B-2: Qty BILL OF MATERIALS — COMPONENTS NOT INSTALLED Reference Description 0 R1, R2, R3, R4, R5, Pull-up or Pull-down resistors R7, R9, R10, R11, Surface-mount (805 package) R12, R13, R14, R15, R16 0 R20, R21 Note 1: Wiper (U1-P0W, U1-P1W) Inline resistor (1) Surface-mount (805 package) Manufacturer Part Number — — — — This resistor when installed is typically 0W, but depending on the PICDEM Demo Board that it selected, modific
MCP4XXX DIGITAL POTENTIOMETER DAUGHTER BOARD USER’S GUIDE Appendix C. Board Testing The MCP4XXX Digital Potentiometer Daughter Board can be used in multiple configurations. Only a subset of these configurations are tested. The tests were performed with the configuration shown in Figure C-1. The tested nodes are Channel 1 through Channel 4. Other configurations, Pad connections, and circuit performance are not tested. Channel 4 Channel 2 Channel 1 Channel 3 FIGURE C-1: Tested Jumper Configuration.
MCP4XXX Digital Potentiometer Daughter Board User’s Guide C.1 WHAT IS TESTED The following portions of the board are tested: • MCP42010 (in U1 and U2) - U1 MCP42010 Pot 0 and Pot 1 are tested in Potentiometer configuration. - U2 MCP42010 Pot 0 and Pot 1 are tested in Rheostat configuration.
Board Testing NOTES: © 2006 Microchip Technology Inc.
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