The A1688 is a Hall-effect integrated circuit (IC) that provides a user-friendly solution for true zero-speed digital ring magnet and gear tooth sensing in two-wire applications. The A1688 is available in a UB package that integrates an IC and a high-temperature ceramic capacitor in a single molded SIP package. This integrated capacitor not only provides higher EMC performance but also reduces the number of external components.
The integrated circuit combines a two-element Hall-effect circuit with signal processing to perform switching operations in response to the differential magnetic signal generated by the magnetic encoder, or in response to the differential magnetic signal generated by the ferromagnetic target if the deviation is appropriately compensated by the magnet. The device contains sophisticated digital circuitry that reduces magnet and system bias, calibrates gain from air-gapped independent switch points, and provides true zero-speed operation.
The device optimizes the signal when it is re-powered on with bias and gain adjustments, and maintains the signal optimization while operating with the run-mode calibration mechanism. Operating mode calibration eliminates environmental effects such as microoscillations during start-up or sudden changes in the air gap of the sensing target.
The adjustable current output can be configured for two-wire interface circuitry and is ideal for obtaining speed information in wheel speed applications. Hall element spacing is optimized for high-resolution, small-diameter targets. The package is lead-free and features a 100% matte tin-plated pinframe.
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集成电容器减少外部 EMI 保护元件的数量要求
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较宽的引脚有助于组装
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真零速运行
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气隙独立开关点的自动增益控制 (AGC)
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优化信号处理的自动偏移调整 (AOA)
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大操作气隙范围
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用于双线式操作的内部稳流器
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欠压锁定
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单芯片感应 IC 实现高可靠性
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板载稳压器，有较宽的工作电压范围，在各种复杂的负载阻抗中能够保持稳定
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完全同步数字逻辑，带扫描和 IDDQ 测试
//www.chip100.com/