Precision sensor signal conditioning for magnetoresistive position sensors

April 17, 2015 // By Graham Prophet
ZMDI (Dresden, Germany) has added the ZSSC5101, an automotive-qualified sensor signal conditioning IC for contactless position sensors based on magnetoresistive technology.

The ZSSC5101 can directly interface with magnetoresistive sensor bridges such as AMR (anisotropic magnetoresistive), GMR (giant magnetoresistive) and TMR (tunnel magnetoresistive) sensors, enabling up to 360° angle sensors or high-resolution linear motion sensors. The chip automatically compensates for temperature drifts of the sensor, allowing superior accuracy over its full temperature range of -40°C to +150°C.

With a high-resolution ratiometric analogue output featuring a resolution down to 0.02° per step, the ZSSC5101 is suited for use as a contactless, wear-free replacement of potentiometers in harsh environments.

“ZSSC5101 [is] the first standard product in ZMDI’s high-precision, magnetic position sensor signal conditioner family,” said Josef Janisch, Global Product Manager for ZMDI’s Position Sensor ICs. “We can enable the most precise integrated magnetic position sensors available today; for example, using the latest AMR sensing technology. With an angular accuracy of 0.1° (typical) or better, these sensors are up to 10 times more accurate than comparable integrated solutions. Furthermore, our unique implementation of automatic drift compensation provides high accuracy over the full automotive temperature range.”

Features include:

  1. High accuracy enables best-available rotation and linear motion sensing;
  2. Only three wires required for operation and programming;
  3. Integrated diagnostic features allow usage in safety-critical applications;
  4. Internal EEPROM allows multiple-time programming;
  5. Full user programmability of angle range, zero position clamping levels, etc;
  6. High-resolution, precision analogue output provides an easy-to-read interface for a variety of applications, such as pedals, valves, and robot arms.

ZSSC5101 is available in a SSOP-14 package and as sawn bare die and tested unsawn wafers.