Microchip Technology ADM00592 User Manual
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Microchip Technology ADM00592 User Manual

Pac1921 high-side current/power sensor evaluation board
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PAC1921
High-Side Current/Power Sensor
Evaluation Board
User's Guide
 2015 Microchip Technology Inc.
DS50002376A

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Summary of Contents for Microchip Technology ADM00592

  • Page 1 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide  2015 Microchip Technology Inc. DS50002376A...
  • Page 2 WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries.
  • Page 3 Object of Declaration: PAC1921 High-Side Current/Power Sensor Evaluation Board  2015 Microchip Technology Inc. DS50002376A-page 3...
  • Page 4 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide NOTES:  2015 Microchip Technology Inc. DS50002376A-page 4...

  • Page 5: Table Of Contents

    3.5 Jumper Settings .................... 23 3.6 Test Points ....................24 3.7 Demo Mode Setup and Operation..............25 3.8 Sys Mode Setup and Operation ..............25 3.8.1 Jumper Positions ..................25 3.8.2 Load Connection ..................25  2015 Microchip Technology Inc. DS50002376A-page 5...
  • Page 6 A.7 Board – Bottom Copper ................51 A.8 Board – Bottom Copper and Silk ..............52 A.9 Board – Bottom Silk ..................52 Appendix B. Bill of Materials (BOM) ................53 Worldwide Sales and Service ..................56  2015 Microchip Technology Inc. DS50002376A-page 6...

  • Page 7: Preface

    – Shows the schematic and layout diagrams for the PAC1921 High-Side Current/Power Sensor Evaluation Board. • Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the PAC1921 High-Side Current/Power Sensor Evaluation Board.  2015 Microchip Technology Inc. DS50002376A-page 7...

  • Page 8: Conventions Used In This Guide

    Please complete the enclosed Warranty Registration Card and mail it promptly. Sending in the Warranty Registration Card entitles users to receive new product updates. Interim software releases are available at the Microchip web site.  2015 Microchip Technology Inc. DS50002376A-page 8...

  • Page 9: Recommended Reading

    Technical support is available through the web site at: http://www.microchip.com/support DOCUMENT REVISION HISTORY Revision A (June 2015) • Initial Release of this Document.  2015 Microchip Technology Inc. DS50002376A-page 9...
  • Page 10 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide NOTES:  2015 Microchip Technology Inc. DS50002376A-page 10...

  • Page 11: Chapter 1. Product Overview

    Screen captures in this document were taken on a PC with Windows Professional using the default desktop colors. The colors on your screen may vary, especially if a Windows theme has been applied on the PC.  2015 Microchip Technology Inc. DS50002376A-page 11...

  • Page 12: What Is The Pac1921 High-Side Current/Power Sensor Evaluation Board

    PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide WHAT IS THE PAC1921 HIGH-SIDE CURRENT/POWER SENSOR EVALUATION BOARD? The evaluation system is comprised of the ADM00592 and a LabVIEW software-based application which allows the user to do the following: • View and change register values •...

  • Page 13: What The Pac1921 High-Side Current/Power Sensor Evaluation Board Kit Contains

    WHAT THE PAC1921 HIGH-SIDE CURRENT/POWER SENSOR EVALUATION BOARD KIT CONTAINS This PAC1921 High-Side Current/Power Sensor Evaluation Board kit includes: • PAC1921 High-Side Current/Power Sensor Evaluation Board (ADM00592) • Supplied USB Mini Connector Cable • Important Information Sheet  2015 Microchip Technology Inc.
  • Page 14 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide NOTES:  2015 Microchip Technology Inc. DS50002376A-page 14...

  • Page 15: Chapter 2. Installation And Operation

    1. Download the software archive from the board’s web page, unzip it and double-click the Setup.exe to start the installation. Figure 2-1 shows the initial installation screen, which displays briefly as the setup program loads. FIGURE 2-1: Software Installation – Initialize Window.  2015 Microchip Technology Inc. DS50002376A-page 15...
  • Page 16 The default location for the software files is C:\Program Files (x86)\Microchip\PAC1921 and for the LabVIEW™ software is C:\Program Files\ National Instruments. FIGURE 2-2: Software Installation – Setting the Destination Directory.  2015 Microchip Technology Inc. DS50002376A-page 16...
  • Page 17 3. Read and accept the license agreement, then click Next. FIGURE 2-3: Software Installation – Software License Agreement. 4. To use the LabVIEW software, read and accept the license agreement, then click Next. FIGURE 2-4: Software Installation – LabVIEW™ Software License Agreement.  2015 Microchip Technology Inc. DS50002376A-page 17...
  • Page 18 Windows Start Menu under Programs>PAC1921 and on the desktop. FIGURE 2-5: Software Installation – LabVIEW™ Software Installation Screen. FIGURE 2-6: Software Installation – LabVIEW™ Software Installation Complete.  2015 Microchip Technology Inc. DS50002376A-page 18...

  • Page 19: Microchip Usb Bridge Installation

    USB port on the PC. If the Microchip USB bridge driver has not previously been installed on the selected USB port, download the MCP2221 Windows driver and installer from www.microchip.com http://www.microchip.com/wwwproducts/Devices.aspx?product=MCP2221 Follow the on-screen instructions to complete the installation process.  2015 Microchip Technology Inc. DS50002376A-page 19...
  • Page 20 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide NOTES:  2015 Microchip Technology Inc. DS50002376A-page 20...

  • Page 21: Chapter 3. Hardware Description

    +3.3V. Note that a return is also provided on this header for convenience (GND). • The +3.3V can be supplied by the SMBus bridge by leaving the +3.3V jumper in place and retaining the USB connection.  2015 Microchip Technology Inc. DS50002376A-page 21...

  • Page 22: Operating Mode

    Signal Green Power is not present is present +5V USB Power USB power is not present +5V USB power is present READ/INT Pin is not asserted Pin is asserted (Read State) (Integrate State)  2015 Microchip Technology Inc. DS50002376A-page 22...

  • Page 23: Jumper Settings

    SOURCE+ Demo Sys Demo Sys Connections ADDR/SEL Reserved Reserved Reserved Note: Refer to Appendix A. “Schematic and Layouts” to see the connections of each jumper position. FIGURE 3-2: Jumper and External Connection Locations.  2015 Microchip Technology Inc. DS50002376A-page 23...

  • Page 24: Test Points

    TABLE 3-3: TEST POINTS Test Point Marking Signal Function Monitored Vsense+ (orange) SENSE+ Vsense- (yellow) SENSE- OUT (white) OUT Pin ADDR_SEL SMBus Address Select Vdd (red) GND (black) Ground #READ/INT (yellow) READ/INT Pin  2015 Microchip Technology Inc. DS50002376A-page 24...

  • Page 25: Demo Mode Setup And Operation

    Figure 3-3. J2 V J11 GND J1 V SOURCE- SOURCE+ Connect to Connect to Connect to System DC System Ground System DC Load or Supply Load or Supply FIGURE 3-3: Load Connection Location.  2015 Microchip Technology Inc. DS50002376A-page 25...
  • Page 26 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide NOTES:  2015 Microchip Technology Inc. DS50002376A-page 26...

  • Page 27: Chapter 4. Software Description

    Interface (GUI) is shown in Figure 4-1. Overflow Status Panel Main Configuration Panel Rsense Option Panel Configuration/View Tabs Panel Control EVB Demo Configuration Panel Panel and Integration Control FIGURE 4-1: GUI Interface Panel.  2015 Microchip Technology Inc. DS50002376A-page 27...

  • Page 28: Tips For Using The Evaluation Board Gui

    • When the PAC1921 enters Sleep state, the PAC1921 clears the measurement registers, and consequently, the GUI Calculations/File IO tab is cleared. To prevent the PAC1921 from entering Sleep, check the “SLEEP OVR” box in the Main Configuration section.  2015 Microchip Technology Inc. DS50002376A-page 28...

  • Page 29: Interface Description And Operation

    4-3, interrupts the GUI software commu- nications with the evaluation board. When the Stop button is clicked, the Run button is displayed on the menu bar (see Figure 4-4). Run Button FIGURE 4-4: Run Button.  2015 Microchip Technology Inc. DS50002376A-page 29...
  • Page 30 To update a register value, locate the register address in the left column, type the new value in the corresponding cell in the right column, and press Enter on the keyboard or click on another part of the GUI.  2015 Microchip Technology Inc. DS50002376A-page 30...

  • Page 31: Main Configuration Panel

    “VBUS FILT_EN” changes take effect, and to update the GUI calculations. It is recommended that the “Enable Auto INT_EN” control be activated when using the GUI. FIGURE 4-8: Enable Auto INT_EN GUI Control.  2015 Microchip Technology Inc. DS50002376A-page 31...

  • Page 32: Overflow Status Panel

    OVR” box in the Main Configuration section to allow the INT_EN bit to override the READ/INT pin state. Note: Read Period (ms) is always enabled. “READ/INT OVR” Box is Checked FIGURE 4-11: Panel and Integration Control.  2015 Microchip Technology Inc. DS50002376A-page 32...

  • Page 33: Evb Demo Configuration Panel

    Vsense- Stimulus” box. To set the current level, rotate the “DC Vsense- Stimulus” dial or type a value between 0 and 100 in the (mV) spin box below the dial. FIGURE 4-12: Evaluation Board Demo Configuration.  2015 Microchip Technology Inc. DS50002376A-page 33...

  • Page 34: Tab Descriptions

    (indicated with arrows) falls outside the Y-axis range on the plot, click the top and/or bottom value on the axis and type in a new value. Click to enter new values to scale the plot. FIGURE 4-13: Vbus & Vsense Tab.  2015 Microchip Technology Inc. DS50002376A-page 34...

  • Page 35: Vbus, Vsense And Vpower Tabs

    Plot Legend Context Menu. 4.3.2 Vbus, Vsense and Vpower Tabs There are separate tabs to show individual plots for Vbus, Vsense and Vpower. They operate similarly to the Vbus & Vsense tab described above.  2015 Microchip Technology Inc. DS50002376A-page 35...

  • Page 36: Calculations/File Io Tab

    Value of R resistor in ohms SENSE DI_GAIN Digital current gain 32V/DV_GAIN Maximum voltage 1023 (210 – 1) = 10-bit FSR Adjustment for 6 unused register bits when read as a 16-bit number  2015 Microchip Technology Inc. DS50002376A-page 36...
  • Page 37 Once a file is saved, it can be recalled at any time by selecting the file in the “FF Reg File Path” box and clicking the Load switch. Click the Chip Defaults switch or press the <F6> function key on the keyboard to reload register defaults on the PAC1921.  2015 Microchip Technology Inc. DS50002376A-page 37...

  • Page 38: Integration Table Tab

    - Enables the “Enable DC Vsense- Stimulus” option. 4.3.4 Integration Table Tab The Integration Table tab, shown in Figure 4-17, shows the maximum integration periods for a selected number of samples with various settings. FIGURE 4-17: Integration Table Tab.  2015 Microchip Technology Inc. DS50002376A-page 38...

  • Page 39: Evaluation Board Examples

    4. Observe the plots on the Vbus & Vsense tab, as shown in Figure 4-18. The evaluation board demo V is ~5.1V and V is ~0.04V. SENSE Check the “READ/INT OVR” Box Check the “Enable Auto INT_EN” Control FIGURE 4-18: Pin-Controlled Integration, No Gain.  2015 Microchip Technology Inc. DS50002376A-page 39...
  • Page 40 Pin-Controlled Integration without Gain. 6. To see the effects of gain, change “DI_GAIN” to 2X and “DV_GAIN” to 4X in the Gain Config 00h section, as shown in Figure 4-20. FIGURE 4-20: Pin-Controlled Integration with Gain.  2015 Microchip Technology Inc. DS50002376A-page 40...
  • Page 41 7. Observe the data on the Calculations/File IO tab, as shown in Figure 4-21. Notice that the Register Data values (with the exception of the accumulators) reflect the gain. FIGURE 4-21: Pin-Controlled Integration with Gain.  2015 Microchip Technology Inc. DS50002376A-page 41...

  • Page 42: Power Free-Run Integration Example

    5. Observe the plots on the Vbus & Vsense tab, as shown in Figure 4-22, adjusting the Y-axis values as desired. These settings result in the shortest integration period. FIGURE 4-22: Free-Run Integration, Shortest Period.  2015 Microchip Technology Inc. DS50002376A-page 42...
  • Page 43 6. Check the “VSENSE FILT_EN” and “VBUS FILT_EN” boxes to enable the ADC post filters, and observe the improvement in the plots on the Vbus & Vsense tab, as shown in Figure 4-23. FIGURE 4-23: Free-Run Integration with ADC Post Filters Enabled.  2015 Microchip Technology Inc. DS50002376A-page 43...
  • Page 44 7. Uncheck the “I_RES” and “V_RES” boxes to enable 14-bit resolution, and observe the improvement in the plots on the Vbus & Vsense tab, as shown in Figure 4-24. FIGURE 4-24: Free-Run Integration with 14-Bit Resolution.  2015 Microchip Technology Inc. DS50002376A-page 44...

  • Page 45: Troubleshooting

    If the GUI freezes for unknown reasons, communications cannot be stopped and the program cannot be closed. Disconnect the USB cable from the evaluation board, then close the program. Reconnect the evaluation board, then restart the GUI.  2015 Microchip Technology Inc. DS50002376A-page 45...
  • Page 46 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide NOTES:  2015 Microchip Technology Inc. DS50002376A-page 46...

  • Page 47: Appendix A. Schematic And Layouts

    Board – Top Silk • Board – Top Copper and Silk • Board – Top Copper • Board – Bottom Copper • Board – Bottom Copper and Silk • Board – Bottom Silk  2015 Microchip Technology Inc. DS50002376A-page 47...

  • Page 48: Board - Pac1921 Current Shunt And Power Monitor Schematic

    BOARD – PAC1921 CURRENT SHUNT AND POWER MONITOR SCHEMATIC Shunt 2.54 mm 1x2 Handle Shunt 2.54mm 1x2 Handle TP LOOP Red Shunt 2.54 mm 1x2 Handle 12.1k 12.1k 12.1k 12.1k 100R TP LOOP Black 0603 0603 0603 0603 0603 SENSE+ 1 μF 0.1 μF SOURCE+...

  • Page 49: Board - Usb Bridge And Sig Gen Schematic

    BOARD – USB BRIDGE AND SIG GEN SCHEMATIC +5V_USB Steady state current generator Waveform Current Generator IDEMO Idemo 7.5k 3.32k Idemo 0.022 μF 0603 0603 7.5k 3.32k 0.1 μF MCP6004 12.1k MCP6004 15.4k MCP6004 MCP6004 0.1 μF 0.1uF 15.4k 12.1k 0603 0603 0603...

  • Page 50: Board - Top Silk

    PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide BOARD – TOP SILK BOARD – TOP COPPER AND SILK  2015 Microchip Technology Inc. DS50002376A-page 50...

  • Page 51: Board - Top Copper

    Schematic and Layouts BOARD – TOP COPPER BOARD – BOTTOM COPPER  2015 Microchip Technology Inc. DS50002376A-page 51...

  • Page 52: Board - Bottom Copper And Silk

    PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide BOARD – BOTTOM COPPER AND SILK BOARD – BOTTOM SILK  2015 Microchip Technology Inc. DS50002376A-page 52...

  • Page 53: Appendix B. Bill Of Materials (Bom)

    MCHP Analog PWM Controller, 1 MHz, Microchip Technology MCP87050T-U/MF MCP87050-U/MF, PDFN-8 Inc. Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM used in manufacturing uses all RoHS-compliant components.  2015 Microchip Technology Inc. DS50002376A-page 53...
  • Page 54 MCHP Analog Op Amp, 4-Ch, 1 MHz, Microchip Technology MCP6004-I/SL MCP6004-I/SL, SOIC-14 Inc. Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM used in manufacturing uses all RoHS-compliant components.  2015 Microchip Technology Inc. DS50002376A-page 54...
  • Page 55 Bill of Materials (BOM) NOTES:  2015 Microchip Technology Inc. DS50002376A-page 55...

  • Page 56: Worldwide Sales And Service

    Taiwan - Taipei Tel: 886-2-2508-8600 San Jose, CA China - Xian Fax: 886-2-2508-0102 Tel: 408-735-9110 Tel: 86-29-8833-7252 Fax: 86-29-8833-7256 Thailand - Bangkok Canada - Toronto Tel: 66-2-694-1351 Tel: 905-673-0699 Fax: 66-2-694-1350 Fax: 905-673-6509 01/27/15  2015 Microchip Technology Inc. DS50002376A-page 56...

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