Cover All the Angles In Your Automotive Systems

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Magnetoresistive Angle Sensor Systems

NXP’s magnetoresistive sensor technology is the superior choice for automotive measurement systems. Features such as lack of wear, long term stability and direct measurement combine to deliver highly accurate and robust sensors. With standalone sensors, companion signal conditioning ICs and complete single-package sensing solutions, our range of cost effective angle sensors covers all your application needs.

Offering many technical benefits over other technologies, our magnetoresistive (MR) angle sensors provide car manufacturers with a more reliable and accurate solution for automotive angle measurement – reducing the risk of mechanical breakdown and improving overall vehicle safety. This is an increasingly important area within automotive electronics as the industry moves closer to incorporating advanced X-by-wire networks and control systems, such as FlexRay, that rely on accurate measurement data.

MR sensors use magnetic fields to conduct measurement information between physical value and sensor. This contactless principle allows isolation of all rotating components, making the entire sensing system robust with respect to pollution and mechanical degradation. Also, MR sensors evaluate the direction of the magnetic field and not the field strength. As a result, MR sensors can tolerate variations in field strength caused by aging, mechanical fluctuations or temperature sensitivity of the magnet.

 

APPLICATIONS Electronic throttle control (ETC) Variable valve control (VVC) Pedal and wiper positioning Active suspension Automatic headlight adjustment Electronic steering Seat positioning

BENEFITS Contactless angle measurement up to 180°C Measurement independent of magnetic drift caused by lifetime and temperature changes Operation independent of mechanical tolerances and magnet shifts caused by thermal stress High temperature range Automotive qualification Highly flexible solutions that measure any automotive angle effectively Fully stable operation over long life-cycle

 

 

Single Package Angle Sensor System with On-chip Diagnostics - KMA200

The KMA200 is a pre-aligned, ready to use angular sensor system. It consists of a magnetoresistive element containing two independent MR sensor bridges and a signal conditioning IC in a special multi-chip package that allows 90° bending of the MR element.

 

KMA200 FEATURES Magnetic field angular sensing High accuracy Operating temperature range from -40°C to 160°C Online diagnosis Bidirectional digital interface (SPI) Programmable maximum angle up to 180° Pre-calibrated, ready to use device One package angle sensor system Resolution better than 0.05° Digital or analog output signals (user programmable) Over voltage protection at all external pins EEPROM (user programmable) Programmable zero point

 

Example for analog output voltage with positive slope

 

 

 

Single Package Angle Sensor System - KMA199E

The KMA199E is a pre-aligned, ready to use angular sensor system like KMA200 but intended for applications with basic feature set. KMA199E contains additional protection diodes to make it robust against ESD and electrical transients.

 

KMA199E FEATURES High precision sensor for magnetic angular measurement Programmable user adjustments, including zero angle and angular range Single package sensor system Magnet-lost and power-lost detection Built-in transient protection User-programmable 32-bit identifier Ready to use Ratiometric output voltage Independent from the magentic field strength above 35kA/m Programming via One-Wire Interface (OWI) Fail-safe EEPROM High temperature range Factory calibrated

 

Example for analog output voltage with positive slope

 

 

 

Magnetoresistive Angle Sensors KMZ41/KMZ43

Our KMZ41 and KMZ43 sensor bridges contain eight MR resistors, connected as two individual Wheatstone bridges aligned at 45°, possessing different sensitivities. Ensuring maximum flexibility, we offer MR sensor bridges both as standalone devices in SO8 package and as bare die for space critical solutions.

 

 

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
KMA199E T/R		Single Package Angle Sensor Systems with On-chip Diagnostics
KMA200 T/R		Programmable Angle Sensor
KMZ41 /T3		Magnetic Field Sensor
KMZ43T /T3		Magnetoresistive Angle Sensor

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