Microchip Technology PAC1921 User Manual Download Page 1

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2015 Microchip Technology Inc.

DS50002376A

PAC1921

High-Side Current/Power Sensor

Evaluation Board

User’s Guide

Summary of Contents for PAC1921

Page 1: ...2015 Microchip Technology Inc DS50002376A PAC1921 High Side Current Power Sensor Evaluation Board User s Guide...

Page 2: ...Microchip s code protection feature may be a violation of the Digital Millennium Copyright Act If such acts allow unauthorized access to your software or other copyrighted work you may have a right to...

Page 3: ...2015 Microchip Technology Inc DS50002376A page 3 Object of Declaration PAC1921 High Side Current Power Sensor Evaluation Board...

Page 4: ...PAC1921 High Side Current Power Sensor Evaluation Board User s Guide DS50002376A page 4 2015 Microchip Technology Inc NOTES...

Page 5: ...luation 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 Installation and Operation 2 1 Getting Started 15 2 1 1 System Req...

Page 6: ...us Vsense and Vpower Tabs 35 4 3 3 Calculations File IO Tab 36 4 3 4 Integration Table Tab 38 4 4 Evaluation Board Examples 39 4 4 1 Power Pin Controlled Integration Example 39 4 4 2 Power Free Run In...

Page 7: ...PAC1921 High Side Current Power Sensor Evaluation Board Chapter 4 Software Description Describes the main operations in the software Appendix A Schematic and Layouts Shows the schematic and layout dia...

Page 8: ...Quotes A field name in a window or dialog Save project before build Underlined italic text with right angle bracket A menu path File Save Bold characters A dialog button Click OK A tab Click the Powe...

Page 9: ...resources user s guides and hardware support documents latest software releases and archived software General Technical Support Frequently Asked Questions FAQs technical support requests online discus...

Page 10: ...PAC1921 High Side Current Power Sensor Evaluation Board User s Guide DS50002376A page 10 2015 Microchip Technology Inc NOTES...

Page 11: ...YSTEM The evaluation system has three major parts as shown in Figure 1 1 Customer provided Windows PC with an available USB port Microchip PAC1921 Graphical User Interface GUI based on National Instru...

Page 12: ...ister values Saving settings of all registers allowing for quick configuration at a later time Graphing registers The hardware platform provides the following features to the user Headers for connecti...

Page 13: ...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 Bo...

Page 14: ...PAC1921 High Side Current Power Sensor Evaluation Board User s Guide DS50002376A page 14 2015 Microchip Technology Inc NOTES...

Page 15: ...ows operating system A display resolution of 800x600 or larger for viewing several windows simultaneously An available USB port 2 2 INSTALLING THE EVALUATION BOARD SOFTWARE Follow these steps in order...

Page 16: ...stination 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 PA...

Page 17: ...e 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...

Page 18: ...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 In...

Page 19: ...TION 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 previously been installed on...

Page 20: ...PAC1921 High Side Current Power Sensor Evaluation Board User s Guide DS50002376A page 20 2015 Microchip Technology Inc NOTES...

Page 21: ...rial Bus USB connection to power the board USB bus voltage is provided to the on board test power sources and the USB to SMBus bridge The evaluation board circuitry uses the on board regulator to regu...

Page 22: ...sition 2 3 Cycle power to the evaluation board in order for the change to take effect 3 4 LED INDICATORS LED locations are indicated in Figure 3 1 FIGURE 3 1 LED Indicator Locations LEDs indicate the...

Page 23: ...ns to evaluate the features of the PAC1921 Jumper locations are indicated in Figure 3 2 FIGURE 3 2 Jumper and External Connection Locations J11 GND J2 VSOURCE J1 VSOURCE J3 Demo Sys J4 Demo Sys J13 Co...

Page 24: ...Sys mode RSENSE Positions 1 2 are jumpered on both jumpers See Section 3 8 Sys Mode Setup and Operation J5 J6 J7 Reserved Reserved for future use J8 J8 ADDR_SEL See Section 3 3 1 SMBus Mode In SMBus...

Page 25: ...oard Demo Configuration section of the evaluation board GUI see Section 4 2 6 EVB Demo Configuration Panel 3 8 SYS MODE SETUP AND OPERATION Sys mode uses external current sources to exercise and demon...

Page 26: ...PAC1921 High Side Current Power Sensor Evaluation Board User s Guide DS50002376A page 26 2015 Microchip Technology Inc NOTES...

Page 27: ...r end of the cable to the board and the standard USB connector of the cable to any available USB port on the PC The VDD and USB power LEDs LD1 and LD2 respectively will illuminate RED indicating that...

Page 28: ...or quick reconfiguration see Section 4 3 3 1 Configuration Save and Load To configure the GUI and PAC1921 for free run integration power measurement press the F2 function key on the keyboard To reload...

Page 29: ...the GUI operation FIGURE 4 3 Panel Control Section 4 2 1 1 STOP AND RUN BUTTONS Pressing the Stop button as shown in Figure 4 3 interrupts the GUI software commu nications with the evaluation board Wh...

Page 30: ...in down position as shown in Figure 4 5 To stop continuous register reads check the Enable Single Read box In order to capture the register values at a given time click the switch which will briefly...

Page 31: ...nel 4 2 2 1 ENABLE AUTO INT_EN 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 PA...

Page 32: ...lculations done by the GUI In Demo mode select the 1 Ohm Demo button In Sys mode select the 0 005 Ohm System button If another resistor is used check the Custom option button and fill the correspondin...

Page 33: ...ation panel shown in Figure 4 12 contains GUI controls which affect the Demo mode To inject current onto VSENSE check the Enable DC Vsense Stimulus box To set the current level rotate the DC Vsense St...

Page 34: ...shown in Figure 4 13 displays plots for calculated VBUS in volts and calculated VSENSE in volts The plots are not self scaling If the value in the box at the right of the plot indicated with arrows fa...

Page 35: ...applicable graphic in the legend on the right of the tab to display a menu of options as shown in Figure 4 14 FIGURE 4 14 Plot Legend Context Menu 4 3 2 Vbus Vsense and Vpower Tabs There are separate...

Page 36: ...GURE 4 15 Calculations File IO Tab An example of using the equations to calculate power is as follows The value of one LSB in the VPOWER Result registers in watts can be calculated according to Equati...

Page 37: ...ect the folder where the configuration file will be saved The file should be named with the txt extension or similar text file format Once a file name and location have been chosen click the Save swit...

Page 38: ...ration power measurement The Quick Setup switch does the following Enables the Enable Auto INT_EN option Enables the READ INT OVR option Enables the INT_EN option Sets MUX_SEL to VPOWER free run Enabl...

Page 39: ...es 2 In the Panel and Integration Control section check the Integration Time GUI Controlled box and set the Read Period ms to 500 ms This causes the INT_EN bit to toggle between high for 500 ms puttin...

Page 40: ...ology Inc 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 t...

Page 41: ...gy Inc DS50002376A 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 FIGUR...

Page 42: ...x and the Enable DC Vsense Stimulus box enables the Enable Auto INT_EN control and sets MUX_SEL to VPOWER free run Integration begins using the 1 sample default 2 In the Main Configuration section cli...

Page 43: ...DS50002376A 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...

Page 44: ...Guide DS50002376A page 44 2015 Microchip Technology Inc 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 Figu...

Page 45: ...sed Sample Effect 4 5 TROUBLESHOOTING 4 5 1 GUI Controls Unresponsive After Installation Restart the computer In some cases a restart is required after installation 4 5 2 GUI Freezes If the GUI freeze...

Page 46: ...PAC1921 High Side Current Power Sensor Evaluation Board User s Guide DS50002376A page 46 2015 Microchip Technology Inc NOTES...

Page 47: ...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 Board U...

Page 48: ...P LOOP Black TP6 TP LOOP White TP3 TP LOOP White TP4 TP LOOP Red TP5 TP LOOP Yellow TP7 EDZ250 2 J1 EDZ250 2 J2 EDZ250 2 J11 2R 2010 5 R2 2R 2010 5 R3 HDR 2 54 Male 1x3 J3 1 2 3 HDR 2 54 Male 1x3 J4 1...

Page 49: ...R37 3 32k 0603 1 R47 12 1k 0603 1 R48 7 5k 0603 1 R46 12 1k 0603 1 R51 15 4k 0603 1 R49 20R 0603 1 R72 120R 0603 1 R38 0 022 F 50V 0603 C14 2200 pF 50V 0603 C13 100 pF 50V 0603 C21 10 F 10V 0603 C4 R...

Page 50: ...PAC1921 High Side Current Power Sensor Evaluation Board User s Guide DS50002376A page 50 2015 Microchip Technology Inc A 4 BOARD TOP SILK A 5 BOARD TOP COPPER AND SILK...

Page 51: ...Schematic and Layouts 2015 Microchip Technology Inc DS50002376A page 51 A 6 BOARD TOP COPPER A 7 BOARD BOTTOM COPPER...

Page 52: ...PAC1921 High Side Current Power Sensor Evaluation Board User s Guide DS50002376A page 52 2015 Microchip Technology Inc A 8 BOARD BOTTOM COPPER AND SILK A 9 BOARD BOTTOM SILK...

Page 53: ...3V SMD SOT 883 Infineon Technologies ESD5V3U2U 03LRH E6327 1 FB1 Ferrite 500 mA 0 1R SMD 0603 Laird Signal Integrity LI0603E470R 10 3 J1 J2 J11 Conn Terminal 5 08 mm 15A Female 1x2 TH R A On Shore Te...

Page 54: ...SMD 0603 Panasonic ECG ERJ 3EKF20R0V 2 R73 R74 Res Trimmer Cermet 10k 10 500 mW TH 3386F Bourns Inc 3386F 1 103TLF 1 RS1 Res Shunt 0 005R 1 2W 1 2412 Ohmite Manufacturing LVK25R005FER 1 TP1 Conn TP Lo...

Page 55: ...Bill of Materials BOM 2015 Microchip Technology Inc DS50002376A page 55 NOTES...

Page 56: ...86 24 2334 2829 Fax 86 24 2334 2393 China Shenzhen Tel 86 755 8864 2200 Fax 86 755 8203 1760 China Wuhan Tel 86 27 5980 5300 Fax 86 27 5980 5118 China Xian Tel 86 29 8833 7252 Fax 86 29 8833 7256 ASIA...

Page 57: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Microchip ADM00592...

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