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A1667 Datasheet(PDF) 10 Page - Allegro MicroSystems |
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A1667 Datasheet(HTML) 10 Page - Allegro MicroSystems |
10 / 15 page True Zero-Speed, High Accuracy, Ring Magnet Sensor IC A1667 10 Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com BRP BOP BOP BOP(initial) BRP(initial) 1 4 2 3 Start Mode Hysteresis, POHYS Output Signal, VOUT If exceed PO HYS on high side If exceed PO HYS on low side IC Position Relative to Target Target Magnetic Profile Differential Signal, VPROC Target, Ring Magnet N S S START MODE HYSTERESIS This feature helps to ensure optimal self-calibration by rejecting electrical noise and low-amplitude target vibration during initialization.ThispreventsAGCfromcalibratingtheIConsuch spurious signals. Calibration can be performed using the actual target features. Atypicalscenarioisshowninfigure6.TheStartModeHysteresis, POHYS, is a minimum level of the peak-to-peak amplitude of the internal analog electrical signal, VPROC, that must be exceeded before the A1667 starts to compute switchpoints. Figure 6. Operation of Start Mode Hysteresis • At power-on (position 1), the A1667 begins sampling VPROC. • At the point where the Start Mode Hysteresis, POHYS, is exceeded, the device establishes an initial switching threshold, by using the Continuous Update algorithm. If VPROC is falling through the limit on the low side (position 2), the switchpoint is BRP, and if VPROC is rising through the limit on the high side (position 4), it is BOP . After this point, Start Mode Hysteresis is no longer a consideration. Note that a valid VPROC value exceeding the Start Mode Hysteresis can be generated either by a legitimate target feature or by excessive vibration. • In either case, because the switchpoint is immediately passed as soon as it is established, the A1667 enables switching: --If on the low side, at BRP (position 2) the output would switch from low to high. However, because output is already high, no output switching occurs. At the next switchpoint, where BOP is passed (position 3), the output switches from high to low. --If on the high side, at BOP (position 4) the output switches from high to low. As this example demonstrates, initial output switching occurs with the same polarity, regardless of whether the Start Mode Hysteresis is exceeded on the high side or on the low side. |
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