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MLX90217LUA 齿轮传感型
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DATASHEET PDF
MLX90217LUA.pdf
Features and Benefits
■ Rotary Position Gear Tooth Sensor
■ Short Circuit Protection
■ On-chip 10 bit A/D Converter
■ Self-Adjusting Magnetic Range
■ High Speed Operation
■ No Chopper Delay
■ Zero Speed Detection
■ No Rotary Orientation Concerns
Applications
■ Camshaft Sensor
■ Geartooth Sensor
■ Linear Encoder
■ Rotary Encoder
Description
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
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）
Application Notes
Maximum dynamic range is 500 mT。 The
hysteresis is fixed at 5。0 mT。 Best angular
accuracy will be obtained when the magnetic
circuit provides peak magnetic flux at the chip
near the high end of the linear range of 500 mT。
EMC protection using external components are
recommended。 Two possibilities are shown on
the following page。 Normally the South pole faces
the unbranded side of the device。 A North pole
will enable a test sequence used in factory
testing。
Unique Features
The output is reset to the high state at power on
（output driver is off） whatever the field is。 The
output only changes after the first min is detected。
The reset state holds no information about the
field。 If the supply of the chip is raised slowly， the
reset state is not stable。 This has been observed
at 0 field but it should be the same with small and
large fields。
Gear tooth sensors often need to be adjusted
after the module is assembled to align the
magnet with differential Hall plates or orient with
teeth。 However the MLX90217 is “self adjusting”
over a wide range of back bias flux eliminating
the need for any trimming in the application。 The
magnet may be glued to the back surface （non
branded side） of the IC using a cyanoacrylate
adhesive or suitable epoxy。
此类产品本公司大量原装现货热卖
