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DRV5055-Q1: DRV 5055-Q1 hall effect sensor
Part Number: DRV5055-Q1
Hello, I am using a DRV5055-Q1 linear hall effect sensor as a gear tooth sensor for my application. The sensor has a bandwidth of 20kHz. The gear rotates at around 1500 rpm to 2500 rpm. i am unable to attenuate the noise generated. So i need to develop a Low pass RC filter as stated in the DATASHEET. which i did try but i am not very much satisfied and the result is poor. Can you help me with the required values of the R and C that i need to incorporate.
Thank you for using the TI forum. In General, with an RC filter, you can look at the RC time constant to see how it affects the timing of the system. For a given resistance, the larger the capacitor the less noise you will see, but the slower the response will be. In order to know how much of a delay you can get away with, you'll need to also consider how much resolution you need. For example, If you are just counting gear teeth, then you'll need to know how many teeth there are per revolution to make sure that the sensor bandwidth can handle the rotation speed. Once you find out the minimum bandwidth your system can handle, you can use and RC filter design calculator (such as this one: http://sim.okawa-denshi.jp/en/CRlowkeisan.htm to get your R and C values.
On another note, although Hall effect sensors can do gear tooth counting, it is also very common to do this kind of application with an inductive sensor. If you are interested in learning more about this, please see the inductive sensing FAQ page: https://e2e.ti.com/support/sensors/f/1023/t/295036.
Mitch M, TI Sensing Products Applications Support
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