LX3301A Inductive Sensor Interface IC with Embedded MCU Description The LX3301A is a member of Microsemis new family of smart sensor interface products. Designed to process inductive sensors, which are based upon linear variable differential transformer (LVDT) principles, this new device integrates two complete analog channels, oscillator/exciter, 32-bit RISC processor, non-volatile configuration memory, and analog or PWM outputs. Clock/ Watchdog Regulator OSC1 EEPROM Feedback OSC2 ROM DOUT EMI PWM CL1 Demod AAF ADC Filter 32 -bit Filter AOUT MCU DAC EMI Demod CL2 AAF ADC Filter Filter EEWR Figure 1: Top-Level Block Diagram In typical operation, inputs from the inductive sensor are conditioned, demodulated, and converted into 13-bit values. The MCU processes these values to produce a linearized measurement value with either 12-bit accuracy (analog output) or 13-bit accuracy (PWM output.) Internal non-volatile memory allows the user to configure various parameters within the IC, including five (5) calibration points, origin/end points, and low and high plateau levels. The internal non-volatile memory is configured via the VIN power pin, which allows a sensor assembly to be configured without the need for additional programming pins. Key Features Embedded 32-bit processing engine with 12 kB User-programmable 16 x 16-bit non-volatile program memory configuration memory Two sensor input channels with integrated demodulator Multiple diagnostics features (ISO 26262 compliant) Internal oscillator with frequency range of 1 to 5 MHz Host interface: Analog output or PWM Dual 13-bit ADC with sample rates to 2 kHz 4.5 V to 5.6 V input voltage 8 mA (typical) operating current, not Linearization algorithm with: including exciter tail current o Five user-defined linearization points -40 to 125 C operation, AEC-Q100 grade 1 certified o Programmable origin and end points o 6 segments linearization o Programmable low and high plateau levels SUB GNDCL VIN VDD GND MUX LX3301A Inductive Sensor Interface IC with Embedded MCU System Power GND SUB OSC1 OSC2 DOUT OSC1 AOUT OSC2 VDD AOUT/DOUT System VIN EEWR LX3301A Sensor Controller CL1 VDD CL2 NC GNDCL CL2 EEWR NC CL1 Figure 3: 14-TSSOP Pin Assignments Figure 2: LVDT/Inductive Sensor Configuration Target Applications The LX3301A includes integrated diagnostics features, The LX3301A is an ideal solution for measuring mechanical which regularly monitor various functions within the IC and movement (linear, angular/rotation, and proximity) in a wide report conditions which are outside of specified parameters. variety of applications in automotive, industrial, aerospace, In the event of a detect failure, the device drives the output and commercial applications including: to a pre-defined diagnostics level. The internal diagnostics Rotor position sensing (brushless DC motors) information can also be output via SENT-compatible Robotic arm positioning protocol for system development and debug purposes. Fluid level sensing The LX3301A is compliant with ISO 26262 and rated for Proximity detection (industrial automation) ASIL C applications. Packaged in a 14-TSSOP package, the device Gear position/travel (automotive) operates (to specification) from -40 to 125 C and maintains full functionality to 150 C. The LX3301A is certified to AEC-Q100 grade 1. For more information about Microsemis product portfolio for automotive and industrial applications, visit