|Description||True Zero-speed Hall-effect Gear-tooth Sensor Subassembly|
|Company||Allegro Micro Systems, Inc.|
|Datasheet||Download ATS632LSA datasheet
The ATS632LSA gear-tooth sensor is an optimized Hall-effect IC/ magnet combination that provides extremely accurate tooth edge detection when used with large-pitch targets. The sensor subassembly consists of a high-temperature plastic shell that holds together a compound samarium-cobalt magnet and a single-element self-calibrating Hall-effect IC that has been optimized to the magnetic circuit. This small package, with its non-oriented operation, can be easily assembled a PC board for complete protection and used in conjunction with a number of gear configurations. The gear sensing technology used for this sensor subassembly is Hall-effect based. The sensor incorporates a single-element Hall IC that switches in response to absolute magnetic signals created by a ferrous target. The digital output is LOW over a tooth and HIGH over a valley. The sophisticated processing circuitry contains self-calibrating 6-bit A/D circuitry that adapts the thresholds to the peak-to-peak signals to minimize the effects of variation in application air gap on switch-point timing accuracy. The effects of system and device offsets are minimized by using active offset cancellation circuitry. The digital algorithm provides zero-speed detection capabilities without the associated running jitter inherent in classical digital solutions. This sensor system is ideal for use in gathering speed, position and profile information of ferrous objects. They are particularly suited to large tooth/valley sensing applications where accurate timing accuracy is a desired feature. For applications requiring the sensing of fine-pitch gears, the ATS610LSA and ATS611LSB are recommended.ZERO-SPEED, SELF-CALIBRATING, NON-ORIENTED, HALL-EFFECT GEAR-TOOTH SENSOR
Supply Voltage, VCC......................... 24 V* Reverse Supply Voltage, VRCC........ -24 V Output OFF Voltage, VOUT................. 25 V Output Current, IOUT.. Internally Limited Reverse Output Current, IOUT........ 50 mA Package Power Dissipation, PD.................................... See Graph Operating Temperature Range, TA............................ to +150°C Storage Temperature, TS............ +170°C
* Operation at increased supply voltages with external circuitry is described in Applications Information.Always order by complete part number, e.g., ATS632LSA.
Non-Oriented Installation Fully Optimized Gear-Tooth Sensors Zero-Speed Digital Output Representing Target Profile Large Operating Air Gaps Extremely Low Timing Accuracy Drift with Temperature Correct First-Edge Detection Self-Calibrating Circuitry with Integrated Offset Cancellation 6-bit A/D Converters to Capture Peaks Thresholds Proportional to Peak-to-Peak Signals Optimized Magnetic Circuit Single-Chip Sensing IC for High Reliability
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 853-5000 W Copyright © 1998, Allegro MicroSystems, Inc.
ELECTRICAL CHARACTERISTICS over operating voltage and temperature range (unless otherwise specified).
Limits Characteristic Supply Voltage Under-Voltage Lockout Low Output Voltage Output Current Limit Output Leakage Current Supply Current Calibration Count Symbol VCC VCC(UV) VOUT(L) IOUTM IOFF ICC ncal Test Conditions Operating, 165 °C IOUT = 20 mA, VCC V IOUT = 20 mA, Output ON VOUT 12 V VOUT 24 V, Output OFF Output OFF, Target Speed = 0 RPM Output falling mechanical edges after power on for startup calibration to be complete Output falling mechanical edges for the threshold calibration to be complete VCC 10 pF Min. Typ. Max. Units µA mA PulsesPower-On Time Output Rise Time Output Fall Time
NOTE: Typical data is at VCC 12 V and +25° C and is for design information only.
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