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drv8307: Hall sensor mess

tiFouBarre
Prodigy 40 points
Other Parts Discussed in Thread: DRV8307, DRV8307EVM

Hello.

First, please pardon my noobness, i am very new to motors and hall effect sensors and many things that can seem basic to most. Still learning.

I am trying to pilot a motor (salvaged from laser printer). It is a BLDC motor, three phases, Wye winding. Everything seems fine at the moment with that.

My problem is with the hall sensors. I have three sensors, four pins each. Two are for GND and +5v, the two others give a 2.6v constant level and show opposite curves when a magnetic field comes around. If i approach a South field, signal 1 goes up and signal 2 goes down accordingly. Same if i approach a North field, but signal 1 goes down and 2 up. 

As far as i have seen from datasheet, i need to provide a signal that goes from -VREG to VREG. That is understood. However, what i need to understand is that differential voltage thing and how i can make those sensors comply.

To resume, i don't know what to do with those sensors so that they are useful. Can anyone please give me a hint or something to push me in the right direction?

Thank you.

  • 0
    TI__Guru** 114905 points
    Hi,

    What you are describing sounds like a hall element. Operation of hall elements are described in section 9.1.1. As the voltage on the output pins separate, the comparator in the DRV8307 detects this as a logic high or logic low and acts accordingly.

    To begin with, you should try connecting each of the three hall elements with the same output pin connected to Hx+.

    Additional information is available by examining the DRV8307EVM. There is a user's guide, schematic, and other documentation that can help.
  • 0 in reply to Rick Duncan
    Prodigy 40 points
    Yes, thanks. Looking for "hall element" took me to similar packages and features.
    I guess that once i'll find a datasheet in English, i'll learn which is "positive" and "negative" signal. At the moment, i only know how they react to south or north field. At the moment, it seems i am in the configuration of figure 11, i just have to figure out the pinout of the two "data" pins of the sensor.
    Thank you very very much.