ATS643LSH
带持续更新的自行校准零点速度差分齿轮齿传感器 IC

功能及优点

• 全面优化的差分数字齿轮齿传感器 IC
• 可实现高可靠性的单芯片 IC
• 可双线式操作的内部电流稳压器
• 小型 (8 mm 直径 X 5.5 mm 深度)
• 独立的开关点气隙
• 表示齿轮配置文件的数字输出
• 在整个温度范围以内的准确的工作循环度
• 较大的工作气隙
• <2 ms 通电时间
• AGC 和参考调整电路
• 真零点速度操作
• 欠压锁定
• 较宽的工作电压范围
• 已定义通电状态

描述

ATS643 是集成电路与稀土磁铁的优化组合，可为双线式应用中的真零点速度数字齿轮齿感测提供制造商友好型解决方案。该器件包括一个单脉冲模压塑料封装，其中包括钐钴磁铁、极片以及专为磁路和汽车环境优化的霍尔效应 IC。该小型封装可便于组装并使用在不同齿轮形状及尺寸上。

该集成电路将双元件霍尔效应 IC 与信号处理电路相结合，可响应旋转铁磁目标产生的差分磁性信号而进行开关操作。该器件包括一个复杂的补偿电路，以消除通电时即刻产生的磁铁和系统偏移。模拟信号的数字跟踪用于取得真零点速度操作，同时也设置器件的开关点。设置后的开关点独立于气隙，可极大地提高输出和工作循环准确度。该器件还使用持续更新算法对处于运行模式的开关点进行微调，以便即使在气隙或温度发生较大变化时也能保持器件的规格。

可调节的电流输出经配置可进行双线式操作，提供固有的诊断信息。该器件是在诸如变速器速度感测等齿轮齿应用领域中获得速度和工作循环信息的理想之选。

功能方框图

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ATS643LSH
Self-Calibrating Zero-Speed Differential Gear Tooth Sensor ICs with Continuous Update

Features and Benefits

• Fully-optimized differential digital gear tooth sensor IC
• Single chip-IC for high reliability
• Internal current regulator for 2-wire operation
• Small mechanical size (8 mm diameter × 5.5 mm depth)
• Switchpoints air gap independent
• Digital output representing gear profile
• Precise duty cycle accuracy throughout temperature range
• Large operating air gaps
• <2 ms power-on time
• AGC and reference adjust circuit
• True zero-speed operation
• Undervoltage lockout
• Wide operating voltage range
• Defined power-on state

Description

The ATS643 is an optimized combination of integrated circuit and rare-earth pellet that provides a manufacturer-friendly solution for true zero-speed digital gear-tooth sensing in two-wire applications. The device consists of a single-shot molded plastic package that includes a samarium cobalt pellet, a pole piece, and a Hall-effect IC that has been optimized to the magnetic circuit and the automotive environment. This small package can be easily assembled and used in conjunction with a wide variety of gear shapes and sizes.

The integrated circuit incorporates a dual element Hall-effect IC with signal processing circuitry that switches in response to differential magnetic signals created by rotating ferromagnetic targets. The device contains a sophisticated compensating circuit to eliminate magnet and system offsets immediately at power-on. Digital tracking of the analog signal is used to achieve true zero-speed operation, while also setting the device switchpoints. The resulting switchpoints are air gap independent, greatly improving output and duty cycle accuracy. The device also uses a continuous update algorithm to finetune the switchpoints while in running mode, maintaining the device specifications even through large changes in air gap or temperature.

The regulated current output is configured for two-wire operation, offering inherent diagnostic information. This device is ideal for obtaining speed and duty cycle information in gear-tooth based applications such as transmission speed sensing.

Functional Block Diagram