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VR Hall Module Kit User`s Manual D000015 Rev B

1. The VR Hall module provides up to six identical VR sensor inputs A Variable Reluctance VR sensor is a standard production automotive speed sensor It is an electro magnetic sensing device containing a winding of wire around a permanent magnetic core It relies on the movement of ferrous material steel teeth past the tip of the sensor to change the magnetic flux of the sensor This creates a voltage pulse across the leads of the sensor s wire coil Figures 4 and 5 below show a typical VR signal with respect to toothed wheels as shown in figures 2 and 3 The VR signal will go positive as a tooth approaches the sensor tip The signal will then rapidly swing back through zero precisely at the center of the tooth As the tooth moves away from the sensor tip the voltage will continue in the negative direction and then return to zero Figure 2 Positive tooth trigger wheel Figure 3 Negative tooth trigger wheel Figure 4 Correct signal polarity for VR input circuit Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 7 Drivven Inc VR Hall Module Kit Figure 5 Incorrect signal polarity for VR input circuit Each VR sensor input requires two connections The VR Hall module pins labeled VR1 thru VR6 are the positive sensor inputs The negative sensor inputs must be connected to GND pins on the module The polarity of the sensor connection to the module is critical The leads of the sensor should be connected such
2. D000015 Rev B 10 Drivven Inc VR Hall Module Kit Software Installer The VR Hall Module Kit is provided with an installer package which may be downloaded from Drivven s Sharepoint website after obtaining login access from Drivven User s may go to http portal drivven com SoftwareDownload and enter the provided username and password to gain access to the specific product installer packages which have been purchased The installer packages are executables which should be run on the intended development computer having LabVIEW development tools installed After installing the package a Start gt Programs gt Drivven gt ProductRelease menu item will be added to the desktop The specific product will have an example LabVIEW project appear under the Examples menu and the user manual will appear under the Manuals menu User s may copy and open the example project to experiment with the module or use as a starting point for a new application All software files example projects and documentation are installed to C Program Files National Instruments LabVIEW X X vi lib addons DrivvenProductRelease When working with block diagrams user s will notice a Drivven function palette added to the standard LabVIEW palette specific for the RT or FPGA target VIs for a specific Drivven product will be categorized according to product name Also some Drivven products will install RT and FPGA VIs under a General function palette which
3. Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 15 Drivven Inc VR Hall Module Kit Standard Circuit Configuration The VR Hall module is hardware configurable It may be ordered with the default options outlined below or may be custom ordered It may not be configured by the user Standard VR Configuration VR Amplitude Voltage 150V 150V 150V 150V 150V O 6 150V Standard Hall Configuration Channel Pullup Resistor Pulldown Divide Resistor Intended ohms Resistor ohms ohms Frequency Hz Use Switch or TTL Switch or TTL Switch or TTL Switch or TTL Switch or TTL Switch or TTL Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 16 Drivven Inc VR Hall Module Kit Custom Configuration For an additional service charge Drivven will custom configure each VR and or Hall chanel Customization can take place during or after module purchase When requesting a custom configuration please provide all of the following information Customer Business Name Contact Name Contact Phone Contact Email Shipping Address Unit Serial Number Has this unit been modified by the user Channel Pullup Resistor Pulldown Resistor Divide Resistor Break Frequency Intended ohms ohms ohms Hz Use Hall 1 Hall 2 Hall 3 Hall 4 Hall 5 Hall 6 hannel VR Amplitude Voltage R 1 R3 R4 R5 R6 lt lt lt le lt JJ
4. N Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 17 Drivven Inc VR Hall Module Kit Examples The following screen capture in Figure 11 shows a LabVIEW FPGA block diagram with the VR Hall FPGA VI used for general purpose speed measurement The VR Hall signals may also be routed to the CrankSig and CamSig inputs of Drivven s EPT VIs for engine position tracking This FPGA application is entirely contained within a single cycle loop clocked at the required 40 MHz This example project and VI is included in the VR Hall Module Kit VI software bundle 6000000 RiHall1 rHallControl vRIHall2 EF VRIHall3 WU R_Hall Trigger 0101 DIOL 1 VR Hal JUU VR_Hall SPI RdyBsy 2 DIO2 ES RJHallS R_Hall ID Select TDSelectIn VR_Hall OvrSmpClk DIOD DIOO a z WU VR Hall SPI Conv DIO3 DIOS VR Hall VR_Hall SPI Func 0104 HJ DIO4 R_Hall SPI MISO 0106 DIOS VR Hall ID Select IUU Set Output Enable Enable IDSelectOut N by Puu vR Hal SPICk Jr R_Hall SPICS DIOS Figure 11 LabVIEW FPGA Block diagram example Drivven Inc 2009 e VR Hall Module Kit User s Manual 0000015 Rev B 18
5. if previously running and create a new LabVIEW project Give the new project a name by clicking the Save Project button on the project toolbar Right click on the highest item in the project hierarchy Project and navigate to New gt Targets and Devices 5 Within the Add Targets and Devices dialog select the appropriate radio button depending on whether you already have an existing powered and configured RT target on the network or if you are adding new HT target which is not present yet on the network a Existing Target or Device i Expand the appropriate category in the Targets and Devices list to see the discovered targets in that category ii Double click the desired target to add it to your project b New Target or Device i Expand the appropriate category in the Targets and Devices list to see all possible targets within that category ii Double click the desired target to add it to your project 6 If the new RT target is not currently on the network right click on the RT target within the project and open the properties dialog to set the IP address or DNS name if necessary 7 Right click on the RT target within the project and navigate to New Targets and Devices Within the Add Targets and Devices dialog select the appropriate radio button depending on whether you already have an existing FPGA target connected to an existing RT target or if you are adding a new FPG
6. 150 V input range Adaptive threshold o Hall effect sensor or general purpose digital inputs Digital input with hysteresis Over under voltage protection Optional Pullup Pulldown and Divide resistors RC filter for noise rejection gt External output for each channel according to software configuration gt Sensor power output o 5V 100mA o Protected with resettable fuse Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 3 Drivven Inc Pinout NC NC NC NC GND GND GND GND GND OUT 2 Vcc Vcc Vcc Vcc VCC Vcc GND GND 20 21 22 23 24 25 26 2f 28 29 30 31 37 33 34 35 36 37 oD O O O O O O O O O O O O O DD D Joch wech TS 12 13 14 15 16 17 18 19 NC NC VR 1 VR2 VR 3 VR 4 Hall 3 Hall 4 Hall 1 Hall 2 OUT 1 OUT 3 OUT 4 OUT 5 OUT 6 VR 6 VR 5 Hall 6 Hall 5 VR Hall Module Kit Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 4 Drivven Inc VR Hall Module Kit Hardware This module provides six input channels which may be individually software selected as VR sensor input or hall effect sensor input It also provides sensor power and ground Sensor power is provided directly from the cRIO chassis backplane All sensors should not draw more than a total of 100mA VCC pins are protected with a 0 1A resettable fuse Each of the six channels provide an external digital output The signal output is configured
7. 150 volts will be exceeded at maximum speed then the sensor gap must be increased or the designer must obtain a custom VR circuit configuration from Drivven Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 9 Drivven Inc VR Hall Module Kit Hall Effect Sensor Inputs The VR Hall module provides up to six identical hall effect sensor input circuits The hall effect inputs are designed to take a digital input from a hall effect or proximity sensor Typical sensors of this type will have an open collector output requiring a pullup resistor at the collector The hall effect inputs will also read active TTL compatible signals The standard configuration includes a 4 7K pullup to 5V for use with open collector type inputs The input is protected against typical automotive battery voltages and can be connected to actively driven battery voltage signals Channels with this configuration are protected from voltage swings of 30V The circuit s output to the RIO FPGA reverses the polarity of the input by going low when the input voltage is greater than 2 0V The output goes high when the input is less than 1 0V Figure 7 shows the standard configuration of the hall effect sensor input circuits VCC PU Hall Input 4 7K DIV FILT l Al 0 3 9K PD C Hall Open TOpF v Figure 7 Hall effect circuit input configuration Drivven Inc 2009 VR Hall Module Kit User s Manual
8. modules will be appended there if any Drivven module software has been installed Select the appropriate module 2 9 4 D D J Q9 Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 12 Drivven Inc VR Hall Module Kit location Finally specify an appropriate name for the module which will later appear in the FPGA I O nodes in the FPGA block diagram Having meaningful module names is important for preventing coding mistakes 13 After adding a module to the project a folder will automatically be added to the project having the same module name given in the module configuration dialog The folder will contain the FPGA I O pins for the module slot These I O pins can be selected in the block diagram when connecting the module VI Pinlnput and PinOutput clusters to FPGA nodes The example application discussed below should be consulted for further details about connecting the and PinOutput clusters to FPGA UO nodes Within the example projects notice the FPGA I O node elements having module name prefixes 14 Some Drivven modules can be automatically recognized by LabVIEW when adding cRIO modules to the project However Drivven does not recommend using this feature because the module names which are automatically assigned are not meaningful Mod1 Mod2 etc and can lead to coding mistakes when wiring the Drivven FPGA VIs to the I O nodes Adding the modules to the project m
9. A target which is not present yet a Existing Target or Device i Expand the appropriate category in the Targets and Devices list to see the discovered FPGA targets in that category ii Double click the desired target to add it to your project b New Target or Device i Expand the appropriate category in the Targets and Devices list to see all possible targets within that category ii Double click the desired target to add it to your project If the new FPGA target was not currently in the system right click on the FPGA target within the project and open the properties dialog to set the resource name if necessary The resource name can be found from MAX when connected to the actual remote system 10 If the FPGA target is a PXI or PCI card then a R Series expansion chassis must be added under the FPGA target This is done by right clicking on the FPGA target and navigating to New gt R Series Expansion Chassis Within the following dialog select the appropriate FPGA connector to which the chassis will be connected A unique name for the chassis may also be specified 11 Right click on the R Series expansion chassis or cRIO FPGA target chassis and navigate to New gt C Series Modules 12 Select the New Target or Device radio button and double click on the C Series Module in the Targets and Devices list In the following dialog select the desired Drivven module at the bottom of the Module Type list The Drivven
10. DRIVVEN VR Hall Module Kit User s Manual D000015 Rev B January 2009 DRIVVEN WWW DRIVVEN COM Drivven CompactRIO VR Hall Module Part D000015 6 Ch Individually Selected As Adaptive Variable Reluctance Sensor Input OR Hall Effect Sensor Digital Input Drivven 12001 Network Blvd Bldg E Suite 110 San Antonio Texas 78249 USA Phone 210 248 9308 Web www drivven com E mail info drivven com Drivven Inc VR Hall Module Kit Contents rt erer 3 EM 4 AUG RA Powerme y 6 Aan RET T T M 7 Hall Effe ct Sensor un c mood gu HEU MP 600 Quoad RE PR UEE eU dead Que eiie Eai 10 SURE IER e NETTE TTE 11 a LabVIEW E E 12 SUD VL Documenta Ol ME 14 Warning About FPGA UO Node 1 eene nnne 15 Standard e ge 16 ee 18 Driven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 2 Drivven Inc VR Hall Module Kit Introduction The Drivven VR Hall Module Kit offers a set of automotive style inputs to interface with standard automotive position sensors It provides six channels which may be software selected as a VR sensor or hall effect sensor input Features gt 6Ch total individually software configured as VR or hall effect sensor inputs o sensor inputs
11. according to the software selection of VR or Hall A properly strain relieved DB 37 connector not included is used to interface to the module National Instruments provides the CRIO 9933 37 pin Conn Kit screw term conn and DSUB shell which is compatible with this module However any DB 37 connector system may be used Drivven recommends the following DB 37 connector parts and tools available from several electronics parts distributors Allied Mouser Digikey etc Table 1 Connector parts list Description AMP HDP 20 Series 109 37P Receptacle Housing 1757820 4 AMP HDP 20 Series 109 Crimp Socket Contact 205090 1 Norcomp D Sub Connector Hood 37P 45 Degree 971 037 020R121 AMP D Sub Insert Extract Tool 91067 2 Paladin D Sub 4 Indent Crimp Tool 26 20 AWG 1440 Powering the Module The VR Hall module requires power from one source from the CompactRIO backplane male high density D Sub 15 pin HD15 connector which mates with the module s female HD15 connector This power source provides a regulated 5 volts and ground to various digital logic functions within the module The CompactRIO 5V source is active whenever the CompactRIO or R Series Expansion Chassis is properly powered The module should only be powered at the HD15 connector by plugging it into a CompactRIO or R Series Expansion Chassis The module s HD15 connector should not be connected to any other device Do not connect 5VDC power to the VCC outputs of the DB37 co
12. anually as described above is still the recommended method Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 13 Drivven Inc VR Hall Module Kit Sub VI Documentation vr hall revb vi This VI is for interfacing directly with the Drivven VR Hall sensor module and for providing an interface to the LabVIEW RT level The FPGA VI must be placed within a Single Cycle Loop SCL of a LabVIEW FPGA block diagram The SCL must execute at the default clock rate of 40 MHz The FPGA VI requires a pre synthesized netlist file having a matching name and an extension of ngc The netlist file must be located in the same directory as the matching VI The installer will place this file in the LabVIEW addons directory along with the FPGA VI The Pinlnput and PinOutput clusters are wired to LabVIEW FPGA I O nodes which are configured for a cRIO controller chassis or a cRIO R Series expansion chassis Refer to the LabVIEW FPGA documentation for details about creating and configuring FPGA IO nodes Connector Pane vrHallControl NN VrHallData VrHallPinOutput VrHallPinInput Controls and Indicators VrHallControl Cluster of controls to select the sensor type for eac channel When FALSE the channel is configured for a VR sensor and is connected internally to the associated VR input pin of the module external connector When TRUE the channel is configured for a Hall sensor or general purpose digital input and is connected
13. ed to any other speed measurement sub VI AJS T ST I Figure 6 VR input pulse and resulting digital output from VR circuit The absolute maximum VR pulse amplitude allowed by the circuit is 150 volts If the input signal exceeds this voltage damage may occur to the circuit The amplitude should not exceed 150 volts at maximum engine speed The minimum VR pulse amplitude that will generate a digital output by the VR circuit is 200 millivolts Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 8 Drivven Inc VR Hall Module Kit The VR circuit implements adaptive noise rejection features during continuous incoming VR pulses In general an adaptive arming threshold voltage is generated with each VR pulse and bleeds down thereafter The next pulse must have an amplitude that exceeds the arming threshold in order for a digital output to be generated at the rapid zero crossing The initial arming threshold is set to approximately 70 of each pulse s amplitude Given a constant gap between the sensor and the trigger teeth the amplitude of a VR pulse is directly proportional to the speed of the trigger wheel For example if the VR amplitude at 1000 RPM is 10 volts then the amplitude at 2000 RPM will be 20 volts By using an oscilloscope to measure the VR amplitude at a low speed this relationship can be used to determine what the maximum amplitude will be at the maximum speed If the maximum amplitude of
14. internally to the associated Hall input pin of the module external connector VrHallPinlnput These boolean controls must be connected to their corresponding FPGA I O Node input item VrHallData When selected as a VR sensor input the VR Hall output signal will go TRUE at the rapid negative zero crossing of the external VR pulse and remain TRUE until the external VR pulse returns to OV It is important to only use the rising edge of this digital signal because it is always lined up with the rapid negative zero crossing of the external VR pulse When selected as a hall effect sensor or general purpose digital input the VR Hall output is an inverted version of the external signal presented to the hall effect input channel The external output pins also reflect the same signal as presented to the RIO FPGA VrHallPinOutput The boolean indicator named IDSelectEn must be connected to a Set Output Enable method of an FPGA I O Method Node The boolean indicator named IDSelectOut must be connected to a Set Output Data method of an FPGA I O Method Node The remaining boolean indicators must be connected to their corresponding FPGA I O Node output item Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 14 Drivven Inc VR Hall Module Kit Warning About FPGA I O Node Wiring Great care should be taken to ensure that I O nodes are wired to the correct PinlInput and PinOutput clusters of the correct module VI If wired incorrectl
15. is intended to be used across multiple products Requirements The Drivven VIs require LabVIEW 8 5 Full Development or later gt LabVIEW RT Module 8 5 or later gt LabVIEW FPGA Module 8 5 or later gt NI RIO 2 4 or later The VR Hall Module Kit is provided with a LabVIEW FPGA VI for interfacing to the module and reporting VR and hall signal results Figure 8 shows the icon which represents vr_hall vi VrHallControl E NN VrHallData VrHallPinInput VrHallPinQutput Figure 8 vr hall revx vi icon with leads The FPGA VI must be placed within a Single Cycle Loop SCL of a LabVIEW FPGA block diagram The SCL must execute at the default clock rate of 40 MHz The FPGA VI requires a pre synthesized netlist file having a matching name and an extension of ngc The netlist file must be located in the same directory as the matching VI The installer will place this file in the LabVIEW addons directory along with the FPGA VI Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 11 Drivven Inc VR Hall Module Kit Creating a LabVIEW Project Drivven recommends working from the provided example application as a starting point for learning the use of the Drivven software blocks However the following section describes starting a LabVIEW project from scratch and adding a Drivven module 1 Install the Drivven software by running the installer executable and accepting the software license agreement Restart LabVIEW
16. nnector Those pins are 5V outputs Drivven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 5 Drivven Inc VR Hall Module Kit Platform Compatibility CompactRIO modules from Drivven are compatible within two different platforms from National Instruments One platform is CompactRIO consisting of a CompactRIO controller and CompactRIO chassis as shown in Figure 1a below Figure 1a CompactRIO platform compatible with Drivven CompactRIO modules The other platform is National Instruments PXI which consists of any National Instruments PXI chassis along with a PXI RT controller and PXI 78xxR R Series FPGA card An R Series expansion chassis must be connected to the PXI FPGA card via a SHC68 68 RDIO cable The CompactRIO modules insert into the R Series expansion chassis This platform is shown in Figure 1b below FTL mi Figure 1b PXI platform compatible with Drivven CompactRIO modules Drivven CompactRIO modules are not compatible with the National Instruments CompactDAQ chassis Drivven CompactRIO modules REQUIRE one of the hardware support systems described above in order to function The modules may not be used by themselves and or interfaced to third party devices at the backplane HD15 connector These efforts will not be supported by Drivven or National Instruments Driven Inc 2009 VR Hall Module Kit User s Manual 0000015 Rev B 6 Drivven Inc VR Hall Module Kit VR Sensor Inputs
17. that the positive input of the VR circuit sees the waveform shown in Figure 4 The waveform shown Figure 5 is incorrect and the VR circuit will not properly respond to this waveform The rapid zero crossing of the VR signal must be in the negative direction The polarity of the physical tooth or gap on the trigger wheel will contribute to the polarity of the voltage pulse from the sensor Figure 2 demonstrates a positive physical tooth polarity and Figure 3 demonstrates a negative physical tooth polarity Assuming the lead polarity of a sensor remained the same one of the configurations would generate the waveform shown in Figure 4 while the other configuration would generate the waveform shown in Figure 5 Triggers wheels are designed so that the physical center of each tooth or gap corresponds to a known angular position of the wheel This physical center of the tooth or gap always corresponds to the rapid zero crossing of the generated voltage pulse The VR circuit is designed so that the rapid negative zero crossing of the raw sensor signal corresponds to the rising edge of a digital pulse sent to the RIO FPGA The VR output signal to the FPGA will go TRUE at the rapid negative zero crossing of the external VR pulse and remain TRUE until the external VR pulse returns to OV An example of this is shown in Figure 6 Within LabVIEW FPGA the system designer can route this digital signal to the EPT CrankSig or CamSig input The signal can also be rout
18. y then undefined behavior or module damage could result LabVIEW FPGA does not yet provide a method for 3 party module vendors to hide the DIO pins behind module VIs and still be portable to various system configurations Therefore a double check of the I O node wiring is recommended Two LabVIEW FPGA code snippets are shown below from an ADCombo implementation which illustrate this issue Figure 9 shows the correct implementation of the FPGA I O node block for the PinOutput cluster of the ADCombo On the other hand figure 10 shows a coding mistake that should be avoided Notice the ADCombo output items where a Spark module output item is selected instead of the correct ADCombo module output item This means that the Spark DIO5 output is being driven by the ADCombo logic and will cause strange behavior of the spark module or possible damage IDSelectEn SC Dm ADCombo SPICk P DUU ADCombo SPICS DIO5 DIO 2 UU ADCombo SPI MOSI D107 Figure 9 Representative FPGA output node for ADCombo with correct output item selection IDSelectEn SCC ADCombo SPICk P e Spark SPICS 0105 DIO7 ADCombo SPI MOSI DIO7 P Figure 10 Representative FPGA output node for ADCombo with incorrect output item selection for DIO5 This will cause strange behavior or damage to the spark module Applying meaningful names to the modules within the project can help identify these coding mistakes

VR Hall Module Kit User`s Manual D000015 Rev B

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