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.
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传感器以及其它速度传感器。在应用时需要时磁铁的南极面向芯片的底部（没有标签的面）。输出是一个集电极开路，带有短路保护。
MLX90217是一款高端芯片，具有一个片上10比特AD转换器和与数字采样、保持电路类似的逻辑。一个独立的4比特的AD转换器提供一定的滞后效应。MLX90217没有斩波延迟。MLX90217使用单个霍尔，没有旋转对齐问题。磁铁可以是50到400mT.
信号采样时，会接收到增加或者减小的磁场强度。输出会在场强到达最大和下降相当于滞后量时开路。同样的，输出会在场强到达最小和增加相当于滞后量时关闭。
特点和优点
齿轮旋转位置传感器
短路保护
片上10比特A/D转换
自适应调整磁场感应范围
高速操作
无斩波延迟
可检测零速度
无须考虑旋转方向
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