LX3302A and LX3301A
Sensor Evaluation Kit
Nov 2019
www.microsemi.com
© 2019 Microsemi Corporation- Analog Mixed Signal Group
1
Introduction
The LX3302AQPW and LX3301AQPW ICs are a low cost, high-accuracy and superior magnetic noise immune position
sensor IC. The sensor system consists of the inductive position sensor ICs, its printed circuit board sensor, and the
target. A target Metal is attached to the moving mechanical housing, which provides position relative to the fixed
position of sensor PCB.
The inductive PCBs are constructed using printed circuit board material
The sensor assembly is connected to the USB IPCE Programmer Interface through a 4-wires cable carrying +5V, GND,
IO2 (DOUT) and IO3 (AOUT). The IPCE Programmer allows programming of LX3302AQPW and LX3301AQPW
internal configuration EEPROM.
1. Features
The LX3302A and LX3301A evaluation position sensor kits include the following features:
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•
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Inductive sensor measurement IC in TSSOP14 package
Low cost, easy to manufacture inductive position sensor
System calibration with on-chip calibration coefficient storage
4-wire system sensor interface
Firmware and Configuration EEPROM programming GUI
Output can be programmed Analog, PWM (Push Pull or Open Drain) and Threshold detect (TD)
▪
The LX3302A also include SENT, PSI5 and SIN/COS output signal formats.
1.1.
LX3302A and LX3301A Evaluation Kit Contents
The Evaluation Kit contains the following items:
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Inductive position sensor PCB with target assembly
IPCE interface programmer
4pin cable
The IPCE Software downloaded from Microchip Technology
Inductive Position Sensor Landing Page
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Figure one - LX3302A Evaluation Kit
2. System Operation
The evaluation kit has been factory calibrated and is ready to use. The default operation requires a +5VDC power
source which can be supplied either by an external DC power supply or the ICPE programmer connected to PC via
USB.
The Inductive Sensor kit constitutes a main sensor board and a movable target PCB. The main sensor board contains
two oscillator coils (OSC1 and OSC2) and two pickup coils (CL1 and CL2). The IC energizes the two oscillator coils.
The position of the target varies the reception of the two pickup coils relative to each other. The IC demodulates the
two received signals and generates an output signal representative of the relative difference between the CL1 and CL2
signals as shown Fig 2.
The values of the two OSC1 and OSC2 capacitors vary depending on the characteristics of the OSC1 and OSC2
printed circuit board layout pattern. The combination L/C impedance of the printed circuit board layout must be matched
to the LX3302AQPW’s and LX3301AWPW oscillation requirement. Improper matching will prevent oscillator startup
and result in reduced measurement range. Refer to the LX3302AQPW and LX3301AQPW Data Sheets for these
design parameters.
System Power
VIN
OSC1
OSC2
IO3
Host System
Target Board
CL1
LX3302
GNDCL
IO2
CL2
AGND
DGND
VDD
Figure two - Inductive Sensor Operation Principle
3. System Connections
The following figure shows the required external system equipment and their respective connections to the LX3302A
evaluation board. The sensor assembly comes with 4pin connector (CN1) to connect to the IPCE Programmer. The
pin out of this connector is shown below.
Pin#
1
2
3
Pin Name
GND
VIN
IO3
(AOUT)
Functional Description
Ground
+5V Supply/Internal EEPROM Programming, Refer to datasheet for details
LX3302AQPW IO3 output could be programmed to analog/PWM/SENT/PSI5/TD
output. Refer to the LX3302AQPW datasheet.
(LX3301AQPW DOUT output is the Analog/PWM/TD)
Refer to the LX3301AQPW datasheet
4
IO2
(DOUT)
LX3302AQPW IO2 output could be programmed to PWM/SENT.
(LX3301AQPW DOUT output is the PWM/TD)
Figure three – CN1 Connector
4. Inductive Sensor Board Typical Characteristics
The following plot displays an example of linearity achievable with the sensor with a SENT output. Other output
formats will have the same accuracy.
Rotary Inductive Sensor Board LX3302 Matrix Chart
4096
3840
3584
3328
3072
Ideal PPS Reference
CAL(LX3302)
2816
IO3 Amplitude Axis Matrix
2560
2304
2048
1792
1536
1280
1024
768
512
256
0
0
2432
3968
1024
1152
1280
1408
1536
1664
1792
1920
2048
2176
2304
2560
2688
2816
2944
3072
3200
3328
3456
3584
3712
3840
Sensor Board X Axis Displacement Matrix
Figure
8 – An Example of typical Inductive Sensor Board Linearity (Calibrated)
4096
128
256
384
512
640
768
896
5.
Configuration EEPROM
The measurement IC contains an internal EEPROM for storing calibration and configuration parameters. The
calibration parameters enable the production sensor assembly to be factory calibrated guaranteeing consistent unit-
to-unit performance.
6.
Kit EEPROM Programming IPCE
The sensor kit includes an Integrated Programming and Calibration Environment (IPCE) to facilitate system calibration
and configuration. The Integrated Programming Environment contains an EEPROM Programming tool and data
measuring system.
6.1
IPCE Installation
1) After downloading software from
web landing page,
Unzip the IPCE contents.
2) Connect the cable of IPCE Programmer board to the Sensor PCB and plug the USB cable from the IPCE
programmer to the PC.
3) If your operating system does not recognize the dongle, please install the dongle driver
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IPCE > driver > lx33xx dongle driver > Microchip USB Driver
4) When you are connected, dongle status will report that the port is open.
6.2.1 Calibration of the EVB
The sensor is factory calibrated. Please read the EEPROM contents and save it as original prior to re-calibrate the
EVB. For detailed calibration procedure, refer to the calibration documents.
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