Some AMR sensor products have an internal sampling function to reduce the
level of current
consumption.
Continuous flow of the current through the magnetoresistive element results
in the use of
several mA. To reduce the current used to several µA for the entire AMR sensor, the timing that
current flows through the magnetoresistive element is adjusted.
A long intermittent cycle can result in incorrect Hi/Lo determination, and
so if using a
fast-moving magnet, an AMR sensor with a suitable response frequency must be selected.
Immediately after the AMR sensor power is turned on, IC startup may be
unstable, and so the
Hi/Lo determination may be output incorrectly. Set so that the determination is not read until
the circuit stabilizes immediately after the power is turned on. The stabilization time varies
by product, and so see the datasheet for the respective product.