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HMC1052

J

John

Jan 1, 1970
0
Sept. 16, 2004

Hi all,

In regard to HMC1052 magnetic sensor, is it really a weatstone bridge
or they pictured it like one. In any event do you think would be best
performed to excite it with a constant current or constant voltage
excitation please. Thank you for your help in advance. In regard to
R/S mode since it requires a 500mA current does a battery cell would
it be able to handle it even for a short period.

High regards,
John.
 
D

Dave VanHorn

Jan 1, 1970
0
The hall effect is about deflecting flowing charges, so it would seem to me
that keeping the rate of charge flow the same would be ideal.
 
P

Product developer

Jan 1, 1970
0
Sept. 16, 2004

Hi all,

In regard to HMC1052 magnetic sensor, is it really a weatstone bridge
or they pictured it like one. In any event do you think would be best
performed to excite it with a constant current or constant voltage
excitation please. Thank you for your help in advance. In regard to
R/S mode since it requires a 500mA current does a battery cell would
it be able to handle it even for a short period.

High regards,
John.

The Reset / Set current can be dumped from a holding cap with a
MOSFET. I have used this part and quite a few of the other HoneyWell
parts. If you want an elegant solution that is already done and ready
to go try the HMR3100 3 Axis module. It's about 50$ in small quan.

If you get stuck email me and I will send you a Schematic on how to do
your own but if you are in a hurry the HMR3100 is an accurate
magnetometer.
 
P

Paul Burke

Jan 1, 1970
0
John said:
Sept. 16, 2004

Hi all,

In regard to HMC1052 magnetic sensor, is it really a weatstone bridge
or they pictured it like one. In any event do you think would be best
performed to excite it with a constant current or constant voltage
excitation please. Thank you for your help in advance. In regard to
R/S mode since it requires a 500mA current does a battery cell would
it be able to handle it even for a short period.


It's a resistive Wheatstone bridge, with magnetorestrictive elements.
Constant voltage is fine. The RS currents are large, but flow only for
VERY brief periods, a capacitor will hold enough for the pulse.
Honeywell have some good appnotes abvailable for these devices.

Paul Burke
 
J

John

Jan 1, 1970
0
Is it preferable to excite this bridge by a constant current source or
a constant voltage source.

High regards,
John.
 
D

Dave VanHorn

Jan 1, 1970
0
If it's a wheatstone, then constant voltage.
I was thinking it was a hall effect device, they are current based.
 
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