Help with a hall sensor

Projects General Guidance
1

Hi

I need a hall sensor that works on 3.3v.
My default A3144 is a 5v device and I don't have 5v on the PCB.

So, I found these TLE4906LHALA1 hall sensors and grabbed a couple for testing.

Nope...

I thought they would output OV when the magnetic field was present, but the output pin sits at about 2.6v and drops about 0.6v when a field is moved near it - not enough for an Arduino to detect.

A pullup makes no difference. 10K on the output to 3.3v does not pull the output up (or change upon a magnetic field).

Any ideas?

Either what I am doing wrong, or more likely that they are not suitable.

But I have not yet found another 3.3v option (just need a sensor in 3 lead style - not a whole breakout PCB).

2

Device pretty simple, under no circumstances should you see what you're seeing. My bet is, incorrect measurement technique or incorrect wiring. Suggest you try again.

1 Like
3

Sensor package type: PG-SSO-3-2.

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If you are using an Arduino UNO, then connect 5V-point of UNO with Vs-pin (Pin-1) of the sensor. Connect a 5k pullup resistor with Q-pin (Pin-2). Now, operate the sensor and see the voltage swing at the output of the sensor. Report the result.

Arduino UNO will detect as low as 3.0V as logic HIGH (VIH, Fig-1) and will detect as high as 1.0V as logic LOW (VIL, Fig-1). Values beyond these two boundaries fall in the forbidden zone.

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4

NOPE.....

The datasheet is wrong

VCC | GND | OUT

After 10 minutes faffing around, I took a stab at the datasheet being wrong and indeed it works fine when Pin 1 = 3.3v, Pin 2 = GND and pin 3 = Out.

What uses is a datasheet if it's incorrect

So basically the same as a 5v A3144. Lucky I didn't design a PCB for this

5

Post the picture of the sensor you are using so that we can see the package type.

6

Apparently INFINEON are shockers for changing their pinouts and not updating the sheets

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7

What uses is a datasheet if it's incorrect

But that is exactly what the datasheet says!

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8

Yep - I just looked and the datasheet I download from a different supplier is a much older version. That has the pinout as I stated at the start.

That Digikey datasheet is newer and correct.

Note to self. Always check the datasheet version

9

It's the one you gave in post #1

10

maybe... : )

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