LX34311

The LX34311 is a highly integrated programmable data conversion IC designed for interfacing to and managing of inductive position sensors. These sensors use printed circuit board (PCB) traces to accurately detect the location of the metal target and are immune to stray magnetics fields and eliminate the need of a magnet, required with other types of magnetic field based sensors. This IC has more automatic gain control (AGC) in and a dynamic calibration algorithm that makes it easier to design accurate sensors with larger air gap and more mechanical tolerances with less current. It also has an onboard temperature sensor accesible throught the use of SENT interfacing.

LX34311 includes an integrated oscillator circuit for driving the primary coil of an inductive sensor, along with two independent analog conversion paths for the conditioning, converting and processing of sine and cosine analog signals from the secondary coils of the sensor. The output signal is programmable and can either be a DAC (Digital-to-Analog Converter), Analog, PWM or SENT signal that represents the target position with a 12-bit measurement range resolution.

The analog signal path includes adjustable AGC and digital calibration capability to match the mechanical system variation and maximize accuracy. The AGC unit has improved gain for an even wider range of target-to-sensor air gap applications. A unique dynamic calibration algorithm corrects for errors before the on-board linearization stage, maintaining accuracy over a wider range of air gaps.

The expanded 10-segment calibration information can be written to the internal nonvolatile electrically erasable programmable read-only memory (EEPROM) during end-of-line production, resulting in improved production yields by compensating for a wider range of mechanical tolerances.

LX34311 is available in a 14-lead TSSOP package. It operates over a temperature range between -40°C to +150°C, making it suitable for commercial, industrial, medical and/or automotive sensor applications.

LX34311 is developed using the ISO26262 standard to reach ASIL-B levels as a Safety Element out of Context (SEooC). In a redundant sensor system, use two ICs to reach ASIL-C and ASIL-D safety levels.

Get a head start on your design by visiting our Inductive Position Sensor Design Page.

The below list of technical documents, software and reference designs are available upon request, for more information, please contact Dustin.Tenney@microchip.com or Mark.Smith@microchip.com.

- LX34311 Datasheet

- Auto Calibration User Guide

- IPCE Sensor Evaluation and Calibration Software

Microchip can help with your own sensor design with its own unique mechanical constraints. You can start with one of our Kits, but Microchip is ready to help you from day one. Talk with our sales team and describe your sensor requirement. We will work with you on getting a design up and running to take advantage of this advanced technology.

Get started with your first design by ordering a position sensor evaluation kit for your first project. There are linear and rotational evaluation kits available. Each kits includes a Sensor evaluation board, a IPCE programmer, links to our IPCE software, and applicable cables. There are also separate evaluation boards and programmers available for orders.