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ATS601LSG Datasheet(PDF) 10 Page - Allegro MicroSystems |
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ATS601LSG Datasheet(HTML) 10 Page - Allegro MicroSystems |
10 / 14 page Single Element, Tooth Detecting Speed Sensor IC ATS601 10 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615–0036 U.S.A. 1.508.853.5000; www.allegromicro.com is established based on the measured peak value of the previous tooth. This option can be used with any number of teeth-targets, and is comparable to the Continuous Update mode used on many Allegro sensor ICs. With the four-tooth update (4 option), peak information from the last four teeth is stored in on-chip memory. Switching thresholds for the upcoming tooth are established based on the stored infor- mation from four teeth earlier. When used with four-tooth targets, this is allows for optimized switchpoints based on the same tooth from the previous revolution of the target. The programmable threshold update results in improved output switching accuracy on targets with runout and tooth-to-tooth variation (including narrow valleys). With the four-tooth update option, during the first target rotation the device behaves the same as in single- tooth update while one rotation of target information is stored to memory. Similarly, if a direction change or other sudden mag- netic signal change is detected, the device returns to single-tooth update mode and re-learns four target teeth before returning to four-tooth update mode. Switchpoints The running mode switchpoints in the ATS601LSG are estab- lished dynamically as a percentage of the amplitude of the signal, VPROC. There are two switchpoint (BST) choices, selectable with the U or M options. The ATS601LSG uses a single switch- ing threshold (operate and release point identical) with internal hysteresis. The internal running mode hysteresis ( BHYS(rm)) allows for high performance switching accuracy on both rising and falling edges while maintaining immunity to false switching on noise, vibra- tion, backlash, or other transient events. Figure 7 demonstrates the function of this hysteresis when switching on an anomalous peak. Power Supply Protection The ATS601LSG contains an on-chip regulator and can operate over a wide range of supply voltage levels. For applications using an unregulated power supply, transient protection may be added externally. For applications using a regulated supply line, EMI and RFI protection may still be required. Contact Allegro for information on EMC specification compliance. When the supply voltage falls below the undervoltage lockout level, VCC(UV)fall, the device switches to the Off (VOUT = high) state. The device remains in that state until the voltage level is restored to the VCC operating range. Changes in the target mag- netic profile have no effect until voltage is restored. This prevents false signals caused by undervoltage conditions from propagating to the output of the sensor IC. Time BST VPROC(high) VPROC(low) –BHYS(int) +BHYS(int) Switchpoint Level On Output State for POL Bit = 0 Off On Off Figure 7. Switching on internal hysteresis |
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