MLX90217齿轮传感器
The MLX90217 is a self adjusting digital output rotary
position gear tooth sensor designed for use in automotive camshaft
sensing as well as other speed sensing applications. It is designed
to be used with a bias magnet south facing the back (non-marked)
side of the IC. The device has an open collector output which is
short circuit protected.
The MLX90217 is a sophisticated IC featuring an on-chip 10-bit A/D
Converter and logic that acts as a digital sample and hold circuit.
A separate 4-bit A/D converter provides a fixed hysteresis. The
90217 does not have a chopper delay. The 90217 uses a single Hall
plate which is immune to rotary alignment problems. The bias magnet
can be from 50 to 400mT.
As the signal is sampled, the logic recognizes an increasing or
decreasing flux density. The output will turn on (BOP) after the
flux has reached its peak and decreased by an amount equal to the
hysteresis. Similarly the output will turn off (BOP) after the flux
has reached its minimum value and increased by an amount equal to
the hysteresis.
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