Hall Effect Sensor 2.2 - 2.8V Quiescent Current

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metron9
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Posted by metron9: Fri. Sep 16, 2011 - 12:48 AM
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I am using the A1301KUA-T IC Hall effect Sensor. It operates at 5V dc and outputs 2.2 - 2.8 VDC as a Quiescent current.

I will be using the magnetic pole that drops that voltage to 0.1 or so volts. If the AVR is powered at 5V I assume this range of quiescent current will make that a problem since the Uc's pin input hysteresis is in that range.

Is using a 3.75 VDC input for the micro controller chip a good choice, that would make the 2.2 - 2.8 VDC range of the Hall sensor read HIGH.

Perhaps that output hysteresis assumes a 3V uC?

Basically the Uc is just being used as a Schmidt trigger and an led output of each sensor.

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AVR Microcontrollers, megaAVR and tinyAVR
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Kartman
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Posted by Kartman: Fri. Sep 16, 2011 - 03:33 AM
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To be pedamtic, current is measured in amps. So we're talking about a voltage. I'd suggest using the comparator feature as a normal port pin may not determine the correct state and it may be temp sensitive.

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Visovian
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Posted by Visovian: Fri. Sep 16, 2011 - 04:01 AM
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As I understood from datasheet, you sensor is designed for measuring the intensity of magnetic field. It has analog output with quiescent voltage cca Vcc/2.

If you need only "magnetic switch", you had beter tu use some cheap type with digital output 0 <-> Vcc, for example TLE4905.

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