ATS128LSE Highly Programmable, Back-Biased, Hall-Effect Switch with TPOS Functionality Features and Benefits Description Chopper stabilization for stable switchpoints throughout The ATS128LSE programmable, true power-on state (TPOS), operating temperature range sensor IC is an optimized combination of Hall-effect IC and User-programmable: rare-earth pellet that switches in response to magnetic signals Magnetic operate point through the VCC pin: created by ferromagnetic targets in gear-tooth sensing and 9 programming bits provide 4-gauss resolution proximity sensing applications. Output polarity These devices offer a wide programming range for the magnetic Output fall time for reduced EMI in operate point, B . A fixed hysteresis then sets the magnetic OP automotive applications release point, B , based on the selected B . RP OP On-board voltage regulator for 3 to 24 V operation On-chip protection against: The devices are externally programmable. A wide range of Supply transients programmability is available on the magnetic operate point, Output short-circuits B , while the hysteresis remains fixed. This advanced OP Reverse battery condition feature allows optimization of the sensor IC switchpoint and True Zero-Speed Operation can drastically reduce the effects of mechanical placement True Power-On State tolerances found in production environments. A proprietary dynamic offset cancellation technique, with an internal high-frequency clock, reduces the residual offset Package: 4-pin SIP (suffix SE) voltage, which is normally caused by device overmolding, temperature dependencies, and thermal stress. Having the Hall element and amplifier in a single chip minimizes many problems normally associated with low-level analog signals. This device is ideal for use in gathering speed or position information using gear-toothbased configurations, or for proximity sensing with ferromagnetic targets. The ATS128 is provided in a 4-pin SIP. It is lead (Pb) free, Not to scale with 100% matte tin leadframe plating. Functional Block Diagram VCC Regulator To all subcircuits Trim Control VOUT TC Trim Switchpoint Amp Signal Recovery Output Fall Time Program Control Output Polarity GND ATS128LSE-DS Dynamic Offset CancellationHighly Programmable, Back-Biased, ATS128LSE Hall-Effect Switch with TPOS Functionality Selection Guide Part Number Packing* ATS128LSETN-T 450 pieces per 13-in. reel *Contact Allegro for additional packing options Absolute Maximum Ratings Characteristic Symbol Notes Rating Unit Forward Supply Voltage V 28 V CC Reverse Supply Voltage V 18 V RCC Forward Output Voltage V 28 V OUT Reverse Output Voltage V 0.7 V ROUT Internal current limiting is intended to protect Output Current Sink I the device from output short circuits, but is not 20 mA OUT(SINK) intended for continuous operation. Operating Ambient Temperature T L temperature range 40 to 150 C A Maximum Junction Temperature T (max) 165 C J Storage Temperature T 65 to 170 C stg Pin-out Diagram Terminal List Table Number Name Function 1 VCC Input power supply 2 VOUT Output signal 3 NC No connect 4 GND Ground 1 2 3 4 Allegro MicroSystems, LLC 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com