Related Manuals for Microchip Technology PAC1921
Summary of Contents for Microchip Technology PAC1921
- 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...
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Page 5: Table Of Contents
Chapter 1. Product Overview 1.1 Introduction ....................11 1.2 PAC1921 Evaluation System ................ 11 1.3 What is the PAC1921 High-Side Current/Power Sensor Evaluation Board? ..12 1.3.1 Board Layout ..................... 12 1.4 What the PAC1921 High-Side Current/Power Sensor Evaluation Board Kit Contains................... 13 Chapter 2. - Page 6 4.5.2 GUI Freezes....................45 Appendix A. Schematic and Layouts A.1 Introduction ....................47 A.2 Board – PAC1921 Current Shunt and Power Monitor Schematic....48 A.3 Board – USB Bridge and Sig Gen Schematic..........49 A.4 Board – Top Silk ................... 50 A.5 Board –...
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Page 7: Preface
Customer Support • Document Revision History DOCUMENT LAYOUT This document describes how to use the PAC1921 High-Side Current/Power Sensor Evaluation Board as a development tool to emulate and debug firmware on a target board. The manual layout is as follows: •... -
Page 8: Conventions Used In This Guide
PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions: DOCUMENTATION CONVENTIONS Description Represents Examples Arial font: ® Italic characters Referenced books MPLAB IDE User’s Guide Emphasized text ...is the only compiler... -
Page 9: Recommended Reading
Evaluation Board. Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference resources. PAC1921 Data Sheet (DS20005293) This data sheet describes the operation and features of the PAC1921 high-side power/current monitor device with a configurable analog output. THE MICROCHIP WEB SITE Microchip provides online support via our web site at www.microchip.com. - Page 10 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide NOTES: 2015 Microchip Technology Inc. DS50002376A-page 10...
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Page 11: Chapter 1. Product Overview
EVALUATION BOARD USER’S GUIDE Chapter 1. Product Overview INTRODUCTION The PAC1921 is a dedicated power monitoring device with a configurable output. The PAC1921 High-Side Current/Power Sensor Evaluation Board package provides users with the means to exercise device functionality while connected either to target systems (Sys mode) or while utilizing on-board sources (Demo mode). -
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
Product Overview 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...
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Page 15: Chapter 2. Installation And Operation
HIGH-SIDE CURRENT/POWER SENSOR EVALUATION BOARD USER’S GUIDE Chapter 2. Installation and Operation GETTING STARTED 2.1.1 System Requirements To use the PAC1921 High-Side Current/Power Sensor Evaluation Board, the following are required: ® ® • A PC running the Microsoft Windows operating system •... - Page 16 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide 2. Click Next in the Destination Directory window, shown in Figure 2-2. For proper operation, the files must be installed in the default locations. The default location for the software files is C:\Program Files (x86)\Microchip\PAC1921 and for the LabVIEW™...
- 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 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide 5. Follow the on-screen instructions to complete the installation. During installation, shortcuts will be created on the Windows Start Menu under Programs>PAC1921 and on the desktop. FIGURE 2-5: Software Installation – LabVIEW™ Software Installation Screen.
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Page 19: Microchip Usb Bridge Installation
Figure 2-7). FIGURE 2-7: PAC1921 GUI Start-up Screen. MICROCHIP USB BRIDGE INSTALLATION Connect the USB mini connector to the evaluation board and the standard USB con- nector to any available USB port on the PC. If the Microchip USB bridge driver has not... - Page 20 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide NOTES: 2015 Microchip Technology Inc. DS50002376A-page 20...
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Page 21: Chapter 3. Hardware Description
The PAC1921 device is an SMBus-compliant, high-side current/power monitor in a 10-pin, 3 mm x 3 mm DFN package. For details regarding the PAC1921 device, refer to the “PAC1921 Data Sheet” (DS20005293). 3.1.1... -
Page 22: Operating Mode
3.3.1 SMBus Mode By default, the evaluation board is configured so that the PAC1921 operates in SMBus mode with an SMBus address of, 1001_100xb (98h). The address can be changed to 1001_101xb (9Ah) by moving jumper J8 to position 2-3. Cycle power to the evaluation board in order for the change to take effect. -
Page 23: Jumper Settings
Hardware Description JUMPER SETTINGS This evaluation board has pin headers and jumper configurations to evaluate the features of the PAC1921. Jumper locations are indicated in Figure 3-2. SOURCE- SOURCE+ Demo Sys Demo Sys Connections ADDR/SEL Reserved Reserved Reserved Note: Refer to Appendix A. -
Page 24: Test Points
Option”.) SMBus_CLK, VDD Positions 1-2, 3-4, 5-6, 7-8, 9-10 are all jumpered. TEST POINTS The PAC1921 High-Side Current/Power Sensor Evaluation Board provides test points for ground reference and signal access. Table 3-3 summarizes these test points. TABLE 3-3: TEST POINTS... -
Page 25: Demo Mode Setup And Operation
+5V USB as the supply. Parallel sense resistors are provided to convert the current to a corresponding voltage for the PAC1921 to read at the SENSE+ and SENSE- inputs. The evaluation board is assembled with jumpers J3 and J4 positioned for Demo mode (see Section 3.5 “Jumper... -
Page 26: Microchip Technology Inc. Ds50002376A
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
USB connector of the cable to any available USB port on the PC. The V USB power LEDs (LD1 and LD2, respectively) will illuminate RED, indicating that the PAC1921 is powered up and the MCP2221 USB bridge is connected to the PC. The PAC1921 High-Side Current/Power Sensor Evaluation Board Graphical User... -
Page 28: Tips For Using The Evaluation Board Gui
• To reload the PAC1921 register defaults, press the <F6> function key on the keyboard. • When using the GUI, the PAC1921 can enter a Sleep state; however, it wakes to service the GUI SMBus communications, then returns to Sleep. For this reason, the current consumption will be slightly higher than expected in Sleep state when using the GUI. -
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 “Reg Content”, shown in Figure 4-3, is a scrollable list of the PAC1921 registers and the last read value. It is important to note that not all addresses are physical memory locations on the device; these registers will read ‘0’. Likewise, some registers shown (undocumented in the data sheet) may have data.
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Page 31: Main Configuration Panel
The “Enable Auto INT_EN” control is a GUI control convenience. Under normal operation, for most of the integration parameter settings, changes do not take effect until the PAC1921 is placed in the Read state. When the “Enable Auto INT_EN” control is activated (light green – shown as “Enabled” in... -
Page 32: Overflow Status Panel
PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide 4.2.3 Overflow Status Panel The Overflow Status section, shown in Figure 4-9, represents the three bits in the Overflow Status Register 1Ch. When an indicator turns red, it indicates an overflow. FIGURE 4-9: Overflow Status. -
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
PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide TAB DESCRIPTIONS 4.3.1 Vbus & Vsense Tab The Vbus & Vsense tab, shown in Figure 4-13, displays plots for calculated V volts and calculated V in volts. The plots are not self-scaling. If the value in the... -
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
PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide 4.3.3 Calculations/File IO Tab The Calculations/File IO tab, shown in Figure 4-15, displays register data (in decimal by default). It also shows calculated results which were obtained by applying the data sheet equations to the register data. - Page 37 The Calculations/File IO tab contains controls, as shown in Figure 4-16, which save the settings currently configured in the PAC1921 to allow quick reconfiguration at any time. FIGURE 4-16: Save/Load Section. To save configuration settings, configure the PAC1921 as desired, then display the Calculations/File IO tab.
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Page 38: Integration Table Tab
PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide Click the Quick Setup switch or press the <F2> function key on the keyboard to set up the GUI and PAC1921 for free-run integration power measurement. The Quick Setup switch does the following: - Enables the “Enable Auto INT_EN”... -
Page 39: Evaluation Board Examples
Controlled” box, and set the “Read Period (ms)” to 500 ms. This causes the INT_EN bit to toggle between high for 500 ms (putting the PAC1921 in the Integrate state) and low for 500 ms (putting the device in the Read state). - Page 40 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide 5. Observe the data on the Calculations/File IO tab, as shown in Figure 4-19. FIGURE 4-19: Pin-Controlled Integration without Gain. 6. To see the effects of gain, change “DI_GAIN” to 2X and “DV_GAIN” to 4X in the...
- 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...
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Page 42: Power Free-Run Integration Example
PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide 4.4.2 Power Free-Run Integration Example This section provides steps to experiment with free-run integration in SMBus mode and see the effects of filtering, resolution and sampling. It starts by showing the fastest integration period and progressively shows higher accuracy. - 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 PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide 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.
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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...
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Page 47: Appendix A. Schematic And Layouts
HIGH-SIDE CURRENT/POWER SENSOR EVALUATION BOARD USER’S GUIDE Appendix A. Schematic and Layouts INTRODUCTION This appendix contains the following schematics and layouts for the PAC1921 High-Side Current/Power Sensor Evaluation Board: • Board – PAC1921 Current Shunt and Power Monitor Schematic •... -
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... -
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...
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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... - Page 57 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Microchip ADM00592...
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