ADA4571R-EBZ

EV-ADA4571RSDZ User Guide UG-1169 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Evaluating the ADA4571 Integrated AMR Angle Sensor and Signal Conditioner FEATURES GENERAL DESCRIPTION USB 2.0 interface Jumper or computer controlled temperature compensation mode enable Jumper or computer controlled power-down mode enable Measurement test points and coaxial connectors The EV-ADA4571RSDZ evaluation board features the ADA4571 in an end of shaft magnet configuration, as shown in Figure 1. The evaluation kit is composed of an ADA4571 motherboard, a magnetic stimulus on a hand turnable mount, a USB interface, and an SDP-S controller board. The required LabVIEW 2015 graphical user interface (GUI) software for Windows® is available for download from the EV-ADA4571RSDZ product page. EVALUATION KIT CONTENTS ADA4571 magnetic stimulus Dipole magnet Hand movable mounting Readback electronics The EV-ADA4571RSDZ evaluation board features an on-board 5 V regulator; a 4-channel simultaneous sampling, analog-todigital converter (ADC); and jumpers for enabling the temperature compensation and power-down modes within the ADA4571. The ADA4571 motherboard also features test points and unpopulated coaxial connectors for the three outputs of the device. ADDITIONAL HARDWARE REQUIRED 6 V to 12 V bench supply (optional) SDP-S controller board USB cable (supplied with the SDP-S controller board) The SDP-S controller board controls the ADC on the ADA4571 motherboard, reading back the ADA4571 outputs to change the digital inputs to the ADA4571, interface with the GUI, and supply power to the evaluation board through the USB connection. ADDITIONAL SOFTWARE REQUIRED LabVIEW 2015 software downloadable from the EV-ADA4571RSDZ product page For full details, see the ADA4571 data sheet, which must be used in conjunction with this user guide when using the evaluation board. ADA4571 END OF SHAFT MAGNETIC EVALUATION SYSTEM 6V TO 12V SUPPLY USB SDP CONTROL CARD Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 9 EVALUATION SYSTEM WITH MAGNETIC STIMULUS 16135-001 POWER SUPPLY PC GUI INTERFACE UG-1169 EV-ADA4571RSDZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Software Installation Procedures.................................................3 Evaluation Kit Contents ................................................................... 1 Evaluation Board Hardware .............................................................4 Additional Hardware Required ...................................................... 1 Jumper Configuration ..................................................................4 Additional Software Required ........................................................ 1 Device Under Test (DUT) Outputs.............................................4 General Description ......................................................................... 1 Evaluation Board Software ...............................................................5 ADA4571 End of Shaft Magnetic Evaluation System .................. 1 Starting the Evaluation GUI ........................................................5 Revision History ............................................................................... 2 Overview of the Main ADA4571 GUI Window .......................5 Evaluation Board Quick Start Procedures .................................... 3 Motherboard Schematic ...................................................................8 REVISION HISTORY 8/2017—Revision 0: Initial Version Rev. 0 | Page 2 of 9 EV-ADA4571RSDZ User Guide UG-1169 EVALUATION BOARD QUICK START PROCEDURES SOFTWARE INSTALLATION PROCEDURES Install the SDP-S controller board drivers and LabVIEW 2015 runtime engine before using the LabVIEW 2015 GUI. LabVIEW 2015 Runtime Engine To install the LabVIEW 2015 runtime engine, follow the instructions on the National Instruments website. SDP Installation To install the SDP drivers, download the SDPDrivers.exe file from the SDP-S product page and complete the following steps: 2. To initialize the installation, run the SDPDrivers.exe executable file. When the SDP drivers setup wizard appears, click Next (see Figure 2). 16135-003 1. Figure 3. Choose Install Location Window 4. 5. Click Finish to complete the installation of the SDP drivers. Before running the LabVIEW GUI, Connect the SDP-S controller board to the motherboard and plug the SDP-S controller board into the PC with the supplied USB cable. The computer now recognizes the SDP-S controller board, and the LabVIEW 2015 GUI can be opened. Running the LabVIEW GUI To run the GUI, download the LabVIEW GUI software from the ADA4751 product page and complete the following steps: 16135-002 1. Figure 2. SDP Driver Installation Wizard When the Choose Install Location window appears (see Figure 3), click Install. To select a different destination folder, click Browse, select a destination, then click Install. 16135-004 3. Place the downloaded executable file and supporting files in a convenient location for use (see Figure 4). It is recommended to place these files on the root C drive of the PC. Do not separate the executable file from the other files that are downloaded or the executable file cannot run. Figure 4. Place Downloaded Files on the PC 2. Rev. 0 | Page 3 of 9 Double click the ADA4571_EVB.exe file to launch the LabVIEW GUI. UG-1169 EV-ADA4571RSDZ User Guide EVALUATION BOARD HARDWARE The EV-ADA4571RSDZ end of shaft evaluation system comprises of a printed circuit board (PCB) with the AD7866 ADC and an external mountable magnetic stimulus. The ADA4571 evaluation system can be powered directly from the host PC USB, from an external bench supply, or through the on-board 5 V regulator (ADP3336). To power the motherboard through an on-board 5 V reference, apply 6 V to 12 V across the P7 to P8 connectors and configure the jumpers accordingly. If the bench supply features current limiting, it is recommended to set the current limit to 100 mA as a precaution. JUMPER CONFIGURATION Refer to the ADA4571 motherboard schematic (see Figure 13) to understand the purpose of each jumper. Configure the P10 motherboard default jumper as follows: • • Install a jumper on P10 between the USB_VBUS supply and the +5V_ANALOG supply to power the evaluation board through the USB connection at the PC. Alternatively, install a jumper on P10 between +5V_REG supply and the +5V_ANALOG supply to power the evaluation board through the external bench supply DEVICE UNDER TEST (DUT) OUTPUTS The outputs of the ADA4571 can be monitored at the test points located on the evaluation board. All outputs from the ADA4571 are also sampled by the on-board ADC and are available in the LabVIEW GUI. Rev. 0 | Page 4 of 9 EV-ADA4571RSDZ User Guide UG-1169 EVALUATION BOARD SOFTWARE STARTING THE EVALUATION GUI OVERVIEW OF THE MAIN ADA4571 GUI WINDOW To power the evaluation board using the ADP3336 on-board 5 V supply, install a jumper on P10, connecting the +5V_REG supply and the +5V_ANALOG supply. Using an external power supply, plug the positive supply for the evaluation board into the red terminal, P7, and plug the negative terminal into P8 on the ADA4571 motherboard. The evaluation board requires between 6 V and 12 V, which is then regulated to 5 V on the ADA4571 motherboard using the on-board ADP3336. This supply powers both the on-board ADC (AD7866) as well as the ADA4571. Figure 5 shows the main ADA4571 GUI window after launching it. To use the EV-ADA4571RSDZ evaluation board with full USB power, install a jumper on P10, connecting the USB_VBUS supply and the +5V_ANALOG supply. The 5 V USB power supplies the ADA4571. When launching the GUI, the SDP-S controller board must be recognized by the GUI before proceeding. Click the Connect SDP button to read the EEPROM identification of the motherboard and ensure that the correct program is in use. If the SDP-S controller board is not connected, or if the drivers are not installed correctly, an error message appears. Ensure that the drivers are installed correctly, and that the PC recognizes the SDP-S controller board, if this occurs. When the SDP-S controller board is properly connected, and the program recognizes the motherboard, the status bar reads SDP Board Ready and the yellow LED turns green (see Figure 5). 16135-005 Initially, all figures are blank. Click Start Sampling to begin sampling the ADA4571. Figure 5. ADA4571 Evaluation Board Software Main Window Rev. 0 | Page 5 of 9 UG-1169 EV-ADA4571RSDZ User Guide VSIN, VCOS, and VTEMP Raw Outputs 16135-006 The Vsin, Vcos and VTEMP Raw Outputs graph shows the three outputs from the ADA4571 magnetic angle sensor (see Figure 6). 16135-007 The # samples to Graph field sets the number of samples to save and display in the graphs. The default number of samples saved and displayed is 200 samples. Figure 7. Graphing Options Pane Outputs and Calculated Values In Figure 6, the blue and red waveforms indicate the VSIN channel and VCOS channel outputs, respectively, and the green waveform indicates the VTEMP channel output. As the magnet rotates above the ADA4571, the VSIN and VCOS outputs change while staying 90° out of phase. These two channels ,VCOS and VSIN, report similar results that differ by the relative rotation of the sensor die and the voltage offset differences for the sine and cosine channels. Figure 6 shows the output waveforms sampled by the AD7866 ADC. The waveforms are plotted in 12-bit code. The AD7866 simultaneously samples VSIN and VCOS. An internal reference of 2.5 V is subtracted in the hardware because the readout of the ADC is in twos complement. Therefore, the two signals center around 0 in the raw waveform plot. In a real application, it is important that these two channels are simultaneously sampled because extra errors can be introduced from the phase delay between the sampling of the individual channels. For every 50 samples of the VSIN and VCOS, the AD7866 samples the VTEMP channel. When powering the EV-ADA4571RSDZ evaluation board through the USB connector attached to the SDP-S controller board, some variation appears in the supply voltage of the ADA4571. Because the readout of the AD7866 is in twos complement format, with respect to the internal 2.5 V reference, the offset of these waveforms is higher than the inherent offset of the ADA4571. After offset correction of the sine and cosine signals, which is recommended for the end use of the sensor, the offsets due to the ADC reference, as well as the sensor offset, are removed. The values shown in the Output and calculated values pane show the ADA4571 output information in number format (see Figure 8). Again, the VSIN, VCOS, and VTEMP outputs are in 12-bit, twos complement format with respect to the 2.5 V internal reference of the AD7866 ADC. 16135-008 Figure 6. Vsin, Vcos, and VTEMP Raw Outputs Graph Figure 8. Outputs and calculated values Pane A calculated angle value is also shown in Figure 8, given by the Arctangent2 (Angle) function field, and a calculated radius, given by the square root of the sum of squares for VSIN channel and VCOS channel in the Radius (Code) field. Electrical Angle The electrical angle plot gives the calculated Arctangent2 (Angle) value in a visual format, as shown in Figure 9. As the magnetic field angle changes at the anisotropic magneto resistive (AMR) sensors, the electrical angle changes. Graphing Options When the EV-ADA4571RSDZ evaluation board is operating, it constantly samples the VSIN channel and VCOS channel, and it samples the VTEMP channel after every 50 samples of the VSIN and the VCOS channels. 16135-009 To choose the interval between samples, enter different values in the ms between samples text box (see Figure 7). The default interval is 10 ms. This delay is set after information is transferred from the AD7866. Figure 9. Electrical Angle Plot Rev. 0 | Page 6 of 9 EV-ADA4571RSDZ User Guide UG-1169 The Vsin vs Vcos graph shows the electrical angle from the ADA4571. However, there is more information shown in Figure 10, such as the radius of the output values that can give further diagnostic information to system. As long as the sensor is fully saturated, or the applied magnetic field strength exceeds 25 kA/m, the radius value remains unchanged at a constant temperature. As the AMR effect is smaller at high temperatures, the radius value changes with respect to temperature. See the ADA4571 data sheet for the temperature coefficient values for the output amplitude for the VSIN and the VCOS channels. 16135-011 Vsin vs. Vcos Plot Figure 11. Digital Inputs Pane Offset Calibration An offset calibration is required to maximize the accuracy of the ADA4571. The VSIN and VCOS channels have inherent voltage offsets due to a resistor mismatch within the AMR sensor bridges. See the ADA4571 data sheet for full details on the offset voltage ranges for the outputs. 16135-010 There are a few methods that can null the offsets for the outputs. The ADA4571 GUI uses a maximum/minimum value to calculate these offsets. To run an offset calibration, click Run Cal (see Figure 12). When Run Cal is clicked, rotate the magnetic stimulus slowly through an entire mechanical rotation. This slow rotation ensures that the maximum and minimum output voltages are found for each channel. Figure 10. Vsin vs Vcos Graph The offset of each channel is calculated as the midpoint between the maximum and mid values captured during the calibration cycle. During normal operation, the offset value for each channel is subtracted from the current value before calculating the magnetic angle. Digital Inputs To toggle two digital inputs on the ADA4571, click the buttons in the Digital Inputs pane (see Figure 11). The Power Down Disabled button puts the ADA4571 in a low power state by disabling the internal circuitry and placing the outputs in a high impedance state. See the ADA4571 data sheet for full details on the power-down current of the device. The Gain Control Disabled button puts the device in gain control mode (see Figure 11). This mode alters the bridge supply voltage based on the internal temperature value of the ADA4571. 16135-012 Through gain control mode, the output amplitude temperature coefficient of the ADA4571 reduces. See the ADA4571 data sheet for full details on output amplitude vs. temperature with the gain control mode enabled and disabled. Figure 12. Offset Calibration Pane Rev. 0 | Page 7 of 9 Figure 13. ADA4571 Evaluation Motherboard Schematic P1 P1 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 FX8-120S-SV(21) FX8-120S-SV(21) EEPROM_A0 USB_VBUS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 SDA_0 SCL_0 SPI_MISO SPI_CLK SPI_SEL_A 10UF R1 49.9 R10 C1 C11 MISO_BUF CLK_BUF SEL_A_BUF 571-0100 571-0500 P8 P7 1 2 DNI DNI 1 2 3 5 +5V_REG + SUPPLY DUT TC 0.1UF C4 +5V_REG +5V ANALOG USB_VBUS MOLEX22-03-2031 P10 SDA_0_BUF R9 SCL_0_BUF 49.9 R12 DUT PD 49.9 R13 49.9 R11 A0_7866 49.9 49.9 R6 49.9 49.9 R8 R7 U1 3 OUT2 1 OUT 2 OUT1 FB SD_N GND 6 4 7 IN 8 IN1 ADP3336ARMZ R2 R3 100K + SUPPLY 1UF 10UF C10 C2 210K C3 +3V ANALOG C5 1 2 3 10 1 +5V ANALOG DUT TC REF_SELECT 13 DVDD +5V ANALOG 10000PF 12 AVDD COS_OUT MOLEX22-03-2031 P3 SIN_OUT U3 0.1UF 10000PF 0.1UF SNS1 21 TP7 1 TP2 1 VREF 9 DCAPA 15 MISO_BUF SIN_OUT 7 VA1 DOUTA .47UF 6 DUT VTEMP VA2 20 A0_7866 A0 11 +5V ANALOG CLK_BUF 18 SCLK RANGE 19 SEL_A_BUF CS_N 17 +3V ANALOG VDRIVE 16 COS_OUT 5 VB1 DOUTB 4 C6 VB2 2 DCAPB AGNDAGNDDGND .47UF 83 14 AD7866ARUZ 1UF +5V ANALOG DUT PD 5K MOLEX22-03-2031 5K 0.1UF 0.1UF C9 1 2 3 C7 U2 8 VCC EEPROM_A0 1 E0 2 5 E1 SDA_0_BUF SDA 3 E2 6 SCL_0_BUF SCL 7 WC_N VSS 4 M24C64-WMN6TP 1N5818 C15 1 JP1 2 DNI R4 DNI 2 3 4 5 131-3701-261 1 U4 DNI 8 DUT PD PD 7 +5V ANALOG VDD 6 GND 5 DUT VTEMP VTEMP ADA4571ARZ TP4 1 GC 2 VCOS 3 GND 4 VSIN J1 1 SIN_OUT SIN_OUT DUT TC COS_OUT 1 TP6 2 3 4 5 1 TP5 131-3701-261 J2 1COS_OUT C12 P2 C8 C13 C14 DNI 1 JP3 2 DNI R5 22NF +3V ANALOG 16135-013 64.9K 10UF Rev. 0 | Page 8 of 9 DNI D1 UG-1169 EV-ADA4571RSDZ User Guide MOTHERBOARD SCHEMATIC EV-ADA4571RSDZ User Guide UG-1169 NOTES ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. 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