KMA36 Series

KMA36 Series Description: The KMA36 is a universal magnetic encoder for precise rotational or linear measurement. These digital position sensors feature a system-on-chip technology that combines a magnetoresistive element along with analog to digital converter and signal processing in a standard small package. By using Anisotropic Magneto Resistive (AMR) technology, […]

KMA36 Series

Description:
The KMA36 is a universal magnetic encoder for precise rotational or linear measurement. These digital position sensors feature a system-on-chip technology that combines a magnetoresistive element along with analog to digital converter and signal processing in a standard small package. By using Anisotropic Magneto Resistive (AMR) technology, the KMA36 is able to determine contactlessly the magnetic angle of an external magnet over 360°, as well as the incremental position on a magnetic pole strip with 5 mm pole length. Its sleep and low power mode as well as automatic wake-up over I2C – make the KMA36 ideal for many battery applications. Position data can be transmitted using a PWM or digital two-wire (SDA, SCL) communication bus. Using the programmable parameters of this digital position sensor, the user can have access to a wide range of configuration to ensure the maximum of freedom and functionalities. Used as both a linear position sensor or a rotary position sensor, these KMA36 magnetoresistive sensors designed by MEAS (Measurement Specialties) are insensitive to magnetic drift due to mechanical tolerances, changes in temperature or thermal stress. The maintenance-free operation and high bandwidth of this universal magnetic encoder and Position Sensor makes it a good choice for dynamic applications in harsh environments. Measurement Specialties designed the universal magnetic encoder KMA36 to replace the less precise Hall-Effect position sensors that are often susceptible to external noise. As a robust Position Sensors the Measurement Specialties KMA36 can also replace more fragile optical encoders whose bearings are subject to failure.

Features:

  • Contactless Absolute 360° (180°) angle measurement
  • Incremental mode
  • Linear mode
  • Standard I2C Interface (100 kHz)
  • Programmable resolution up to 13 bit (0.04 degree)

 

Symbol Parameter Condition Min. Typ. Max. Unit
fdata Update rate1) 2) 24 720 Hz
tstart Starting time 5 ms
αr Resolution H0=25 kA/m 3) 13 Bit
ΔαL Linearity error H0=25 kA/m 3) ±0.3 ±1 °
ΔαH Hysteresis error H0=25 kA/m 3) ±0.1 ±0.25 °
Vbwn Brown-out reset voltage 2.7 V
tbwn Brown-out reset pulse width 2 µs
Hy Applied magnetic field 15 25 60 kA/m
RCOIL Internal coil resistance 75 100 150 Ω
PWM PWM output resolution 10 bit
fPWM PWM frequency 7.8 kHz

 

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