National Instruments NI 9760 User manual

USER MANUAL
NI 9760
NI Powertrain Controls VR/Hall Sensor Module (Rev C)
Contents
Introduction .............................................................................................................................. 1
Pinout........................................................................................................................................ 2
Hardware .................................................................................................................................. 2
Powering the Module................................................................................................................ 2
Platform Compatibility ............................................................................................................. 3
Input Channels Used for VR Sensor Inputs.............................................................................. 3
Input Channels Used for Hall-Effect Sensor Inputs ................................................................. 5
Custom Configuration .............................................................................................................. 6
Physical Specifications and Characteristics ............................................................................. 6
Electrical Specifications and Characteristics............................................................................ 6
Compliance and Certifications ................................................................................................. 7

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Introduction
The National Instruments 9760 CompactRIO VR/Hall Sensor Module 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 a Hall-Effect sensor input.
Features
• 6 channels software configured as VR sensor or Hall-Effect sensor inputs
– 600 kHz lowpass filter
– VR sensor inputs
• ±60 V input range
• Adaptive/manually programmable arming thresholds
– Hall-effect sensor or general purpose digital inputs
• Over/under voltage protection
• Optional software selectable pull-up resistor
• External output for each channel according to software configuration
• Sensor Power output: 5 V @ 200 mA
• LabVIEW FPGA and LabVIEW Real Time VIs for quick integration with application

NI 9760 User Manual |© National Instruments |3
Pinout
Figure 1. Pin Assignments NI 9760
Hardware
NI recommends using the NI 9923 Connector Kit for connections to the NI 9760. The NI 9923
provides proper strain relief for NI 9760 connections. Visit ni.com/info and enter Info Code
VRHALL for more information on parts and accessories for the NI 9760
Powering the Module
The CompactRIO backplane male high density DSUB 15-pin (HD15) connector, which mates
with the female HD15 connector on the module. This power source provides a regulated 5 V and
ground to various digital logic functions. The CompactRIO 5 V source is active whenever the
CompactRIO or R Series Expansion Chassis is properly powered. You can power the NI 9760
only at the HD15 connector by plugging it into a CompactRIO or R Series Expansion Chassis.
Do not connect the HD15 connector to any other device.
If the 5V OUT lines or internal pull-up resistors are to be used for Hall-effect sensors, then the
external DB-37 connector pins labeled 5-30V IN (19) and GND (36) must be connected to an
external supply of 5V to 30V. The module is reverse battery protected to -30V. The NI 9760
external power ground and CompactRIO backplane power ground are isolated and have no
internal connection.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
17
19
18
16
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
36
37
35
5 V OUT
5 V OUT
5 V OUT
IN + 1
IN + 2
IN + 3
IN + 4
IN + 5
IN + 6
GND
GND
GND
GND
OUT 2
OUT 4
NC
5 – 30 V IN
NC
OUT 6
5 V OUT
5 V OUT
5 V OUT
IN – 1
IN – 2
IN – 3
IN – 4
IN – 5
IN – 6
GND
GND
GND
OUT 1
OUT 3
OUT 5
GND
NC
NC

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Caution The external battery supply input terminals are reverse voltage protected
to -30 V. Connecting the NI 9760 in reverse polarity at voltages greater than -30 V or
forward polarity at greater than +30 V will result in damage. This event is not covered
by warranty.
Platform Compatibility
NI Powertrain Control modules require a hardware support system to function. You cannot use
the modules independently or interfaced with third-party devices at the backplane HD15
connector. NI Powertrain Control modules are compatible with the following National
Instruments platforms:
• CompactRIO, which consists of a CompactRIO controller, chassis, or integrated
controller/chassis.
• NI PXI, which consists of any NI PXI chassis, NI PXI RT controller, and NI PXI-78xxR
R Series FPGA card. The NI Powertrain Control modules insert into an NI R Series
expansion chassis. Connect an NI R Series expansion chassis to the NI PXI FPGA card
using a SHC68-68-RDIO cable.
• MXI-Express, Ethernet and EtherCAT expansion chassis.
Note NI Powertrain Control modules are not compatible with the National
Instruments CompactDAQ chassis.
Note NI Powertrain Control modules do not support Scan Interface mode.
Input Channels Used for VR Sensor Inputs
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 electromagnetic 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 tipthe
voltage will continue in the negative direction and then return to zero.
Figure 2. Positive Tooth Trigger Wheel

NI 9760 User Manual |© National Instruments |5
Figure 3. Negative Tooth Trigger Wheel
Figure 4. Correct Signal Polarity for VR Input Circuit
Figure 5. Incorrect Signal Polarity for VR Input Circuit
Each VR sensor input requires two connections. The VR Hall module pins labeled IN 1+ through
IN 6+ are the positive sensor inputs. The negative sensor inputs must be connected module pins
labeled IN 1- through IN 6-. The polarity of the sensor connection to the module is critical. The
leads of the sensor should be connected such 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 rises above the arming threshold voltage. 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 routed to any other speed
measurement sub-VI.

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Figure 6. VR Input Pulse and Resulting Digital Output from VR circuit
The absolute maximum VR pulse amplitude allowed by the circuit is ±60 V. If the input signal
exceeds this voltage, damage may occur to the circuit. The amplitude should not exceed ±60 V
at maximum engine speed. The minimum VR pulse amplitude that will generate a digital output
by the VR circuit is ±30 mV.
The VR circuit implements adaptive noise rejection features during continuous incoming VR
pulses while in adaptive threshold mode. In general, an adaptive arming threshold voltage is
generated with each VR pulse at 33% of the previous pulse amplitude. 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. If no arming event occurs for 85ms, the arming threshold is reset to
30 mV.
Alternately, a manually set arming threshold can be defined.
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 V, then the amplitude at 2000 RPM will be ±20 V. 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 ±60 V will be
exceeded at maximum speed, then the sensor gap must be increased.
Input Channels Used for Hall-Effect Sensor
Inputs
The VR Hall module provides up to six identical hall-effect sensor input circuits. When using
hall sensors, the ground of the sensor should be connected to the IN - side of an input channel
and one of the GND pins. If the hall sensor has an opencollector output, requiring a pull-up
resistor at the collector, a pull-up resistor can be engaged through software. You must use an
external power supply to use the pull-up resistor.
The circuit's output to the RIO FPGA goes high when the input voltage is greater than the
manually set threshold voltage. The output goes low when the input is less than the manually set
threshold voltage.
Custom Configuration
Visit ni.com/info and enter Info Code ADCOMBO for more information about custom
configuration.

NI 9760 User Manual |© National Instruments |7
Physical Specifications and Characteristics
Weight............................................................... 170 g
Maximum Altitude ........................................... 2000 m
Operating Temperature ..................................... -40 °C to 60 °C
Maximum Ambient Temperature ..................... 60 °C
Operating Humidity.......................................... 10% to 90% RH, non-condensing
Pollution Degree ............................................... 2
Ingress Protection ............................................. IP40
For indoor use only.
If you need to clean the module, wipe it with a dry towel.
Electrical Specifications and Characteristics
External Power
Input Range............................................... 5 to 30 VDC Max
Reverse Polarity Protection ...................... -30 V
5 V Regulated Output
Voltage Tolerance ............................. 5 V 3%, Vsup 6 V
Current .............................................. 200 mA
Short-circuit Protection..................... 400 mA
Inputs
Arming Threshold Digital to Analog
Conversion Range..................................... 0 to 4.096
Arming threshold Digital to Analog
Resolution ................................................. 10 bit
Arming Threshold Range
(Differential Voltage at ExternalPins) ...... 0 to 2.97V
Lowpass Filter .......................................... 600 kHz
Lag time From VR Neg. Zero Crossing
Event to Digital Output Rising Edge........ 3 us
Peak Voltage ............................................. ±60V
Outputs
Voltage Standard....................................... 5 V TTL
Reverse Polarity Protection ...................... ±8 mA

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Safety Guidelines
Caution Do not operate this module in a manner not specified in these operating
instructions. Do not exceed the 60VDC rating. Product misuse can result in a hazard.
You can compromise the safety protection built into the product if the product is
damaged in any way. If the product is damaged, return it to National Instruments for
repair.
Compliance and Certifications
Safety
This product meets the requirements of the following standards of safety for electrical equipment
for measurement, control, and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
Electromagnetic Compatibility
This product meets the requirements of the following EMC standards for electrical equipment
for measurement, control, and laboratory use:
• EN 61326-1 (IEC 61326-1): Class A emissions; Industrial immunity
• EN 55011 (CISPR 11): Group 1, Class A emissions
• AS/NZS CISPR 11: Group 1, Class A emissions
• FCC 47 CFR Part 15B: Class A emissions
• ICES-001: Class A emissions
Caution When operating this product, use shielded cables and accessories.
CE Compliance
This product meets the essential requirements of applicable European Directives as follows:
• 2006/95/EC; Low-Voltage Directive (safety)
• 2004/108/EC; Electromagnetic Compatibility Directive (EMC)
Environmental Management
NI is committed to designing and manufacturing products in an environmentally responsible
manner. NI recognizes that eliminating certain hazardous substances from our products is
beneficial to the environment and to NI customers.
For additional environmental information, refer to the Minimize Our Environmental Impact web
page at ni.com/environment. This page contains the environmental regulations and
directives with which NI complies, as well as other environmental information not included in
this document.

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