ASEK-70311-SUBKIT-T

User Manual Using Allegro ASEK-20 and ASEK70310 Daughterboard with ACS70310 Samples Programmer By Kasey Hampton, Allegro MicroSystems Introduction Downloading the Programmer This quick guide documents the use of the ACS70310 daughterboard (TED-0002702) and the ASEK-20 (Part #850540-004) with the Allegro ACS70310 samples programmer. The ASEK-20 chassis can be seen in Figure 1, and the top and bottom layers of the ASEK-20 ACS70310 daughterboard can be seen in Figure 2. See the Appendix section for the ASEK70310 Daughterboard Schematic. 1. Register for software on the Allegro Software Portal: https://registration.allegromicro.com/login. 2. Ensure that the ASEK-20 being used has the most recent firmware downloaded. Refer to the ASEK-20 firmware webpage (https://registration.allegromicro.com/parts/ ASEK-20) and the ASEK-20 quick guide under “Support Files” on the ASEK-20 firmware webpage. 3. After registering and logging in to the software portal, the dashboard page will be shown. Choose the “Find a Part” button highlighted in Figure 3. Figure 1: ASEK-20 Chassis Figure 3: “Find a Part” button allowing the user to register specific devices 4. Click “Find a Part” to go to the “Available Parts & Software” page. 5. Search for “ACS70310” in the “Select by Part Number” search bar shown in Figure 4. Figure 4: “Select by Part Number” on the Available Parts & Software page 6. Click “View” next to the ACS70310 search result as shown highlighted in Figure 5. Figure 2: Top and Bottom Layers for ASEK-20 ACS70310 Daughterboard ASEK70310-UM MCO-0000943 October 7, 2020 4. Connect the other end of the ribbon cable to the “Device Connection” port on the ASEK-20 chassis as shown in Figure 8. Figure 5: “View” next to “ACS70310” search result 7. Click “Download” next to the first result to open the Programming Application ZIP file as highlighted in red in Figure 6. Figure 8: Connection between ASEK-20 and ASEK70310 Daughterboard 5. Connect the DC Power Supply/Cable to the 5 V port on the ASEK-20 chassis. Figure 6: “Download” to open the Programming Application 8. Open and extract the downloaded ZIP file and save to a known location. 9. Open the extracted ZIP file and open the folder “Allegro ACS70310 Samples Programmer V#”. 10. Open the “Allegro ACS70310 Samples Programmer” application file (EXE file extension) to open the samples programmer. Figure 7: Application file Connecting ASEK-20 to PC and ASEK70310 Daughterboard 1. Connect one end of the USB communications cable to the USB port of a personal computer. 6. Plug in the DC Power Supply to a 110/220 AC 60/50 Hz outlet with the appropriate power adapter. Inserting ACS70310 into ACS70310 Daughterboard The ACS70310 coreless current sensor is offered in through-hole KT (TN) and surface-mount KT (TH) leadforming options. Leadforming options are shown in Figure 9. For more information, refer to the ACS70310 and ACS70311 device datasheet. Figure 9: KT Lead-forming Options To insert the ACS70310 into the ACS70310 daughterboard, do the following: 1. Place the ACS70310 in the socket labeled “J1” with pin 1 of the part farthest away from the “J1” label. 2. Connect the other end of the USB communications cable to the “USB” port on the ASEK-20 chassis. 2. Ensure that the ejector pin mark is on the side facing down into the socket as stated in the pinout diagram in the ACS70310 datasheet (see Figure 10). 3. Connect a ribbon cable to the “J2” connector on the left-hand side of the ACS70310 daughterboard. 3. Secure the part in place using the clamps on the left and right side of the socket. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 2 4. See Figure 11 showing the ACS70310 in “J1” socket. Proceed to Using the Programmer section below. Using the Programmer Connecting to the ASEK-20 Opening the programmer will result in a window identical to Figure 12 below. Figure 12: ACS70310 Programmer Application Figure 10: KT Package Pinout Diagram (ejector pin mark on opposite side) To connect the ASEK-20, click “Setup”  “Communication Setup”. The dialog box in Figure 13 will appear. Click the correct COM# in the pulldown menu next to COM Port. If the COM port is unknown, do the following: 1. Unplug the USB cable to the ASEK-20. 2. Click “Refresh” in the “Communication Setup” dialog window as highlighted in blue in Figure 13. 3. Click on the “COM Port” pulldown menu. 4. Note which ports are in the menu. 5. Plug the USB cable back into the ASEK-20. 6. Click “Refresh”. 7. Click the “COM Port” popup menu again. 8. Note the COM port not previously listed in the menu; this is the port connected to the ASEK-20. 9. Select this COM port to use. Figure 11: ACS70310 KT in “J1” socket Once the correct COM port is selected and the ASEK-20 is connected to the PC, verify next to “Communication” the status of the ASEK-20. If the status is “Active”, the ASEK-20 is powered and responding. If the status is “Inactive”, the ASEK-20 is not responding or powered on. If this is the case, click “Refresh” and ensure the ASEK-20 chassis is plugged into the PC and the chassis is powered on. Click “OK” to exit the dialog box. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 3 Once the part is powered on, values for “VCC [V]” and “ICC [mA]” will populate with the measured values. Verify that the voltage is what is desired and that the device is consuming approximately 13 mA (maximum of 15 mA). To read the output of the ACS70310, select “Read Output” highlighted green in Figure 15. Verify the Output [V] is a reasonable number, around 2.5 volts with zero external field applied if testing a bidirectional part with 5 volts typical VCC (0.5 volts with zero external field applied for a unidirectional device). Figure 13: Communication Setup dialog box Status Bar The green or red colored rectangle on the right side of the status bar shown highlighted in red in Figure 14 indicates the status of the communication with the ASEK. If the status bar is red, the communication is not active and if green, the application is communicating with the ASEK. The COM port that is currently set is overlaid on the colored rectangle. Clicking on the rectangle will open the Communication setup dialog window. To turn the part off, select “Power Off” to the left of “Power On”, highlighted in blue in Figure 14 above. Clicking “Power Off” will cause ICC to fall to ≈ 0 mA. Read and Writing to the Part Note before reading and writing to the part, the part must be connected and powered on using the programmer GUI. It is recommended that the user save the memory to a tabular file before experimenting with programming so the user can return the device to its original factory programmed state if necessary. See the Saving and Loading Memory Files section below. To read a field, select the desired field by checking the box under “Select” to the left of the register name and click the “Read Selected” button highlighted in red in Figure 15. To write to a field, select the desired field by checking the box under “Select” to the left of the name. Change the value under “Code” to the desired value and press Enter. Click “Write Selected” button highlighted in blue in Figure 15. Figure 14: Status bar on the bottom right hand side of GUI Turning the Part ON and OFF To power on the part using the ASEK-20, click “Power On” on the right-hand side of the programmer as show in red in Figure 15. Figure 15: “Power On”, “Power Off”, and “Read Output” To verify that field was written to the device, do the following: click “Clear Selected” causing the values in the “Code” and “Value” cells to disappear. Then click “Read Selected”. The values that were written will reappear in the “Code” and “Value” cells verifying the user correctly wrote to the part. Figure 16: “Read Selected” and “Write Selected” buttons Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 4 Below, each option on the programmer menu has been briefly defined: • Read Selected: reads value of the selected field. • Write Selected: writes entered value to the part. • Zero Selected: this option will zero the selected field but will not write zero to the device unless “Write Selected” is clicked. • Clear Selected: this option will hide and clear the value of the selected field but will not change the value. Manchester Programming Protocol Under “Setup”  “Device Setup…”, the dialog menu in Figure 20 below will appear. In this menu, the user can change various characteristics of the Manchester programming protocol used by the ASEK-20. To restore these settings to their default settings, click “Restore Defaults” as highlighted in red in Figure 20. For more information about the device specific Manchester parameters, see the ACS70310 device datasheet. • Select All: selects all fields. • Deselect All: deselects any and all selected fields. Note that clicking on the name of a selected field will define the field to the user (see Figure 16). Hovering over a field with the PC cursor will tell the user the address of that field (see Figure 18). Figure 20: “Device Setup” menu defaults Below, each Manchester option has been briefly defined: Figure 17: Field definition by clicking desired field • Program Enable [V]: used to set the voltage for the Program Enable. • Serial Pulse High Level [V]: used to set the voltage for the high level of the Manchester signal. • Serial Pulse Low Level [V]: used to set the voltage for the low level of the Manchester signal. Figure 18: Hovering over a field shows the address Accessing the Register Diagram To access the register diagram, hover over “Help” on the menu bar. Select “ACS70310 Register Diagram”. This will open a dialog window identical to the window in Figure 18 below. See the appendix section below for a larger register diagram. Figure 19: ACS70310 Register Diagram • Slew Rate [V/μs]: used to set the speed at which the Manchester signal will take to get from one voltage to another. • Speed [kb/s]: used to set the bit rate for communication with the ASEK. • Threshold [V]: used to set the threshold for determining the difference between a 1 and a 0 when performing register read. • Initial Commands: used for commands that must be sent to the ASEK-20 when it is being initialized. The ACS70310 uses a bidirectional communication on VOUT. When the voltage on the VCC pin is increased beyond the programming threshold, the device will enter programming mode (see Figure 21). Note the ACS70310 does not initiate commu- Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 5 nication; it responds to commands from the external controller. If the command is a write, there is no acknowledging from the ACS70310. If the command is a read, the ACS70310 responds by transmitting the requested data. To initialize any communication, VCC should be increased to a level above VprgL (6.5 V) without exceeding VprgH (9.2 V). At this time, VOUT is disabled and acts as an input. Saving and Loading Memory Files To save the memory as a tabular data file or text file, click “Save…” in the bottom right side of the GUI as highlighted in red in Figure 23. Clicking “Save…” will open a file explorer where the user can save the memory information as a CSV file or TXT file. Saving the memory is recommended before experimenting with programming so the user can return the device to its original factory-programmed state if necessary. The user can also save the memory by clicking “File”  “Save Memory…”. To load a previously saved file containing memory information, click “Load…” as highlighted in green in Figure 23 below. Clicking “Load…” will open a file explorer where the user can navigate to a previously saved CSV or TXT file. The user can also load a memory file by clicking “File”  “Load Memory…”. Figure 21: ACS70310 Programming Diagram Figure 23: “Load” and “Save” the memory to a tabular file Figure 22: Oscilloscope capture showing the Manchester programming protocol on the output of the part Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 6 Two-Point Programming The goal of two-point programming is to calculate and set device sensitivity using two known points. The user must know the values of the magnetic field and the desired voltage output at two levels. Prepare a test bench with the ACS70310 evaluation setup, a ferromagnetic core, and current-carrying conductor. Enter a “Voltage at current level 1 [V]” target value, i.e. 1.5 V. Apply a known magnetic field, i.e. –500 G. Press the “Current Level 1” button. Remove the field once the GUI has finished processing. Enter a “Voltage at current level 2 [V]” target value, i.e. 3.5 V. Apply the know magnetic field, i.e. 500 G. Press the Current Level 2” button. Remove the field once the GUI has finished processing. For this example, the GUI will set the device sensitivity to 2 mV/G and will set the ‘sensf’ register value accordingly. The device sensitivity is calculated as follows: ([3.5 – 1.5] V × 1000 / 500 G = 2 mV/G. The GUI will also set the device offset to 2.5 V and will set the ‘qvof’ register accordingly. The user can now apply 500 G, read the output, and find the output will swing 1 V, 2.5 V to 3.5 V. TIPS AND TRICKS FOR TWO-POINT PROGRAMMING The values for ‘senf’ and ‘qvof’ will be written by the GUI after two-point programming (the user does not have to select “Write Selected”). The coarse gain value will not automatically update. For example, if the user inputs two voltage levels and field levels that equate to a 10 mV/G device sensitivity and the coarse gain value is currently set to 1, the GUI will produce an error message as the device is unable to have a 10 mV/G sensitivity in coarse gain 1. Figure 26: Sensitivity programming range showing sens_coarse values for each sensitivity range If the user uses a positive field when setting a voltage level below QVO, i.e. the user sets the “Voltage at current level 1 [V]” to be 1.5 V and the applied magnetic field after pressing “Current level 1” is 500 G, the GUI will produce and error message asking the user to flip the polarity bit (“pol”). Figure 24: Set level 1 and 2 to desired voltage values Figure 27: Error message asking to reverse the polarity bit Figure 25: Calculating sensitivity using two known points Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 7 Appendix Figure 28: ACS70310 Register Diagram Figure 29: ASEK70310 Daughterboard Schematic Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 8 Revision History Number Date Description – October 7, 2020 Initial release Copyright 2020, Allegro MicroSystems. The information contained in this document does not constitute any representation, warranty, assurance, guaranty, or inducement by Allegro to the customer with respect to the subject matter of this document. The information being provided does not guarantee that a process based on this information will be reliable, or that Allegro has explored all of the possible failure modes. It is the customer’s responsibility to do sufficient qualification testing of the final product to ensure that it is reliable and meets all design requirements. Copies of this document are considered uncontrolled documents. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 9