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'[PIC] Debonce code for HALL device'
2008\12\28@063616 by Harry H. Arends

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Hi group,

For a project I am using a 16F685 and two HALL sensors as a indexing
and station sensor device.
I know that the TLE4905L device has a logical output but would it be
necessary to include some debounce code in the routines.
On the other hand should I use rather a input with TTL or ST.

Regards

Harry

2008\12\28@064856 by Jan-Erik Soderholm

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Harry H. Arends wrote:
> Hi group,
>
> For a project I am using a 16F685 and two HALL sensors as a indexing
> and station sensor device.
> I know that the TLE4905L device

http://www.micropik.com/PDF/TLE4935L.pdf

> has a logical output but would it be
> necessary to include some debounce code in the routines.

To debounce what ? What would be bouncing ?

> On the other hand should I use rather a input with TTL or ST.

Note that the HALL sensor has an internal ST stage before
the output driver.


2008\12\28@084515 by apptech

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>> For a project I am using a 16F685 and two HALL sensors as a indexing
>> and station sensor device.
>> I know that the TLE4905L device
>
> http://www.micropik.com/PDF/TLE4935L.pdf
>
>> has a logical output but would it be
>> necessary to include some debounce code in the routines.

> To debounce what ? What would be bouncing ?

Hall devices do not have bounce behaviour within the IC switch itself *BUT*
there may still be mechanical variations in what is being sensed which drive
the sensor backwards and forwards past its trigger point and effectively
cause "bouncing". This could occur eg on a rotating disk if there is
vibration present.

Generally magnetic sensors will exhibit a degree of inherent hysteresis due
to the properties of the magnetic circuit, and will also often have inbuilt
explicit hysteresis as well. As Jan-Erik notes, the IC cited apparently has
this feature.

> Note that the HALL sensor has an internal ST stage before
> the output driver.

Accordingly, deboune would be required only in extremely mechanically noisy
cases. Try it in a worst case situation, or analyse the field variations
that you expect to be present, and see if debounce seems necessary.



           Russell

2008\12\28@170619 by Harry H. Arends

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Thanks for the prompt reply. After the holiday I will setup a test rig
with scope to see the signals.
I will report the results on the group.

{Quote hidden}

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