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ATS643LSH Datasheet(PDF) 10 Page - Allegro MicroSystems |
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ATS643LSH Datasheet(HTML) 10 Page - Allegro MicroSystems |
10 / 16 page 10 ATS643-DS, Rev. 1 Worcester, Massachusetts 01615-0036 (508) 853-5000 115 Northeast Cutoff, Box 15036 www.allegromicro.com Allegro MicroSystems, Inc. Self-Calibrating, Zero-Speed Differential GTS with Continuous Update ATS643LSH VPROC is directly proportional to the magnetic flux density, B, induced by the target and sensed by the Hall elements. When VPROC transitions through a switchpoint from the appropriate higher or lower level, it triggers sensor switch turn-on and turn- off. As shown in figure 3, when the switch is in the off state, as VPROC rises through a certain limit, referred to as the operate point, BOP, the switch toggles from off to on. When the switch is in the on state, as VPROC falls below BOP to a certain limit, the BHYS(#1) Pk(#4) Pk(#5) Pk(#7) Pk(#9) Pk(#2) Pk(#3) Pk(#1) Pk(#6) Pk(#8) BRP(#1) BOP(#1) BRP(#2) BRP(#3) BOP(#3) BRP(#4) BOP(#4) BHYS(#4) BHYS(#3) BHYS(#2) t+ V+ BOP(#2) (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 sensor 0 360 Target Rotation (°) Hysteresis Band (Delimited by switchpoints) V+ Larger TEAG Smaller TEAG Sensor Target Larger TEAG Target Sensor Smaller TEAG Smaller TEAG release point, BRP, the switch toggles from on to off. As shown in panel C of figure 4, threshold levels for the ATS643 switchpoints are established dynamically as function of the peak input signal levels. The ATS643 incorporates an algorithm that continuously monitors the system and updates the switch- ing thresholds accordingly. The switchpoint for each edge is determined by the detection of the previous two edges. In this manner, variations are tracked in real time. Figure 4. The Continuous Update algorithm allows the Allegro sensor to immediately interpret and adapt to significant variances in the magnetic field generated by the target as a result of eccentric mounting of the target, out-of-round target shape, elevation due to lubricant build-up in journal gears, and similar dynamic application problems that affect the TEAG (Total Effective Air Gap). The algorithm is used to dynamically establish and subsequently update the device switchpoints (BOP and BRP). The hysteresis, BHYS(#x), at each target feature configuration results from this recalibration, ensuring that it remains properly proportioned and centered within the peak-to-peak range of the internal analog signal, VPROC. As shown in panel A, the variance in the target position results in a change in the TEAG. This affects the sensor as a varying magnetic field, which results in proportional changes in the internal analog signal, VPROC, shown in panel B. The Continuous Update algorithm is used to establish accurate switchpoints based on the fluctuation of VPROC, as shown in panel C. (C) Referencing the internal analog signal, VPROC, to continuously update device response BHYS Switchpoint Determinant Peak Values 1 BOP(#1) Pk(#1), Pk(#2) BRP(#1) Pk(#2), Pk(#3) 2 BOP(#2) Pk(#3), Pk(#4) BRP(#2) Pk(#4), Pk(#5) 3 BOP(#3) Pk(#5), Pk(#6) BRP(#3) Pk(#6), Pk(#7) 4 BOP(#4) Pk(#7), Pk(#8) BRP(#4) Pk(#8), Pk(#9) |
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