Magnetic field sensor using AD22151

Magnetic field sensor project using AD22151 IC from Analog Devices, The AD22151 is a linear magnetic field transducer. The sensor output is a voltage proportional to a magnetic field applied perpendicularly to the package top surface. The sensor combines integrated bulk Hall cell technology and instrument technology to minimize temperature-related drifts associated with silicon Hall cell characteristics.

Features

  • Supply 5V DC @ 25mA
  • Power Led On Board
  • Header connector for supply and output
  • Normal Output 1.800V
  • South side Magnet Output 4.800V
  • North side Magnet Output 0.042V

Applications

  • Throttle Position Sensing
  • Pedal Position Sensing
  • Suspension Position Sensing
  • Valve Position Sensing
  • Absolute Position Sensing
  • Proximity Sensing

Sensitivity Adjustment and Zero Gauss

The sensitivity of the sensor can be adjusted by changing some of the resistors on the board. For more information on how to calculate the resistors refer to the datasheet page 5, paragraph GAIN and OFFSET. The operation of AD22151 can be either bipolar or the Zero Gauss point can be set to a different voltage level. The gain can be set by altering resistors R3 and R5. For example, if we want to set for bipolar operation we set R2 and R1 is not placed. For unipolar operation, R1 is set and R2 is not placed. If we want to set output gain to 1.4mV/G  with bipolar operation then we choose R5=R4=85k, R2= 18k, and R1=R3 =omit. This setting will give us a Zero Gauss output of 2.5V, so 2.5V/1.4mV gives us a ± 1785 Gauss output.

Schematic

Magnetic-field-sensor

Parts List

SR.QNTYREF.DESC.
11CN12 PIN MALE HEADER 2.54MM PITCH
21CN22 PIN MALE HEADER 2.54MM PITCH
33C1,C2,C30.1uF/50V SMD 1206
41D1LED SMD SIZE 1206
51R118K SMD SIZE 1206
61R2Omit
71R3470K 1% SMD SIZE 1206
81R41K 1% SMD SIZE 1206
91R5100K 1% SMD SIZE 1206
101R6470E 5% SMD SIZE 1206
111U1AD22151 SMD SO8

Connections

Magnetic-field-sensor-connections

Gerber View

Photos

Magnetic-field-sensor-PIC

Video

AD22151 Datasheet

AD22151

PCB

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kbad1000

Please provide dimensions including
mounting hole diameter and location, sensor location, chip dimensions, pin dimensions

Peng Peng

What is the thickness of the PCB?

Peng Peng

Thank you. Then what is the total thickness? I mean the top to bottom height. I am considering of placing this entire sensor in a 3.9 mm thickness space. Is it possible?
I need 5 pieces currently.

Peng Peng

How can I buy it?

Peng Peng

Thank you for replying. I would like to purchase 5 pieces of sensors. May I have your email for contact?

Giha

Is this sensor accurate to measure in -10uT-10uT range?

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