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A1684LUB Datasheet(PDF) 8 Page - Allegro MicroSystems |
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A1684LUB Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 15 page Two-Wire, Zero-Speed, High Accuracy Differential Sensor IC A1684LUB 8 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com (A) TEAG varying; cases such as eccentric mount, out-of-round region, normal operation position shift (B) Internal analog signal, VPROC, typically resulting in the IC 0 B OP B RP B OP B RP B OP B RP B OP B RP B OP B OP B RP 360 Target Rotation (°) Hysteresis Band (Delimited by switchpoints) V+ (C) Internal analog signal, VPROC, representing magnetic field for digital output V+ Larger TEAG Smaller TEAG IC Target Larger TEAG Target IC Smaller TEAG Smaller TEAG Figure 5: Continuous Update Algorithm The Continuous Update algorithm allows the Allegro IC to interpret and adapt to variances in the magnetic field generated by the target as a result of eccentric mounting of the target, out-of-round target shape, and similar dynamic application problems that affect the TEAG (Total Effective Air Gap). As shown in panel A, the variance in the target position results in a change in the TEAG. This affects the IC as a varying magnetic field, which results in proportional changes in the internal analog signal, VPROC, shown in panel B. The Continuous Update algo- rithm is used to establish switchpoints based on the fluctuation of VPROC, as shown in panel C. Continuous Update of Switchpoints Switchpoints are the threshold levels of the differential internal analog signal, VPROC, at which the device changes output signal state. The value of VPROC is directly proportional to the magnetic flux density, B, induced by the target and sensed by the Hall ele- ments. As VPROC rises through a certain limit, referred to as the operate point, BOP, the output state changes from high to low. As VPROC falls below BOP to a certain limit, the release point, BRP, the output state changes from low to high. As shown in Figure 5, threshold levels for the switchpoints are established as a function of the peak input signal levels. The device incorporates an algorithm that continuously monitors the input signal and updates the switching thresholds accordingly with limited inward movement of VPROC. The switchpoint for each edge is determined by the detection of the previous two signal edges. In this manner, variations are tracked in real time. |
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