Reading halleffect output on bldc motor

[wrinklehead]

I am trying to control a 3 phase brushless dc motor with integrated hall-effect sensors.  I understand how to do this with your typical open-collector hall effects, however according to the manufacturer these are "line-driver" hall effect sensors.  I do not understand how to read them.

Instead of just having 1 output for each halleffect this motor appears to have 2.  I have hooked 12v to Vcc and Ground to ground and measured the output of both the + and - output of the halleffects.  There seems to be 3 possible outputs at each output ~6.86, ~5.8, ~ 5.  I have to missing something right??

 I have attached the very limited information the manufacturer has given me

[jm_araujo]

Linear sensor with differential outputs? The A+/A- style outputs suggests so.

Edit: something like this: http://www.hallsensors.de/CYSH12AF.pdf

[wrinklehead]

I took the motor apart to get a look at the hall effect sensors, and I believe you are correct it looks exactly like the part you  posted the pdf for.  So to simulate a digital signal (to fire an interrupt on microcontroller ). I should probably feed the + and - into an opamp correct?

[Benta]

Comparator is better.

[wrinklehead]

Comparator is better.

Assuming I'm reading the attached section of the datasheet correctly... whats a comparator going to do if there is 7mv of difference between outputs?

[perieanuo]

Comparator is better.

Assuming I'm reading the attached section of the datasheet correctly... whats a comparator going to do if there is 7mv of difference between outputs?

The 7 mV is the offset... The output is Vh it's 'analog' so you have to translate it with an adc or setup a trigger/comparator to detect the position. Not easy stuff...

Envoyé de mon HUAWEI NXT-L29 en utilisant Tapatalk