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。

MLX90217 是一款自适应调整、数字输出的. 旋转位置齿轮传感器，可应用于汽车凸轮轴 。。。

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