ATS617LSG Dynamic, Self-Calibrating, Peak-Detecting, Differential Hall Effect Gear Tooth Sensor IC Features and Benefits Description Self-calibrating for tight timing accuracy The ATS617 gear-tooth sensor IC is a peak-detecting device First-tooth detection that uses automatic gain control and an integrated capacitor to Immunity to air gap variation and system offsets provide extremely accurate gear edge detection down to low Immunity to signature tooth offsets operating speeds. Each device consists of a high-temperature Integrated capacitor provides analog peak and plastic shell that holds together a samarium-cobalt pellet, a pole valley information piece, and a differential open-collector Hall IC that has been Low timing-accuracy drift with temperature changes optimized to the magnetic circuit. This small package can be Low radiated emissions easily assembled and used in conjunction with a wide variety Integrated, series resistor on VCC pin for improved of gear shapes and sizes. transient immunity The technology used for this device is Hall-effect based. The Large air gap capability device incorporates a dual-element Hall IC that switches Small, integrated package in response to differential magnetic signals created by Optimized magnetic circuit ferromagnetic targets. The sophisticated processing circuitry Undervoltage lockout (UVLO) contains an A-to-D converter that self-calibrates (normalizes) Wide operating voltage range the internal gain of the device to minimize the effect of air gap variations. The patented peak-detecting filter circuit provides Package: 4-pin SIP (suffix SG) immunity to magnet and system offsets and has the ability to discriminate relatively fast changes such as those caused by tilt, gear wobble, and eccentricities. This easy-to-integrate solution provides first falling edge detection and stable operation to extremely low rpm. The ATS617 can be used as a replacement for the ATS616. The ATS617 is ideal for use in systems that gather speed, position, and timing information using gear-tooth-based Not to scale Continued on the next page Functional Block Diagram VCC R S Voltage Power-On UVLO Regulator Logic Tooth and Valley Comparator VOUT Gain Hall Amp Track and Hold Current Reference Limit Generator Hall Amp Track and Hold GND TEST (Recommended) ATS617LSG-DS, Rev. 1Dynamic, Self-Calibrating, Peak-Detecting, Differential ATS617LSG Hall Effect Gear Tooth Sensor IC Description (continued) configurations. This device is particularly suited to those applications that require extremely accurate duty cycle control or accurate edge- detection, such as automotive camshaft sensing. The ATS617 is provided in a 4-pin SIP that is Pb (lead) free, with a 100% matte tin plated leadframe. Selection Guide Part Number Packing* ATS617LSGTN-T 13-in. reel, 800 pieces/reel *Contact Allegro for additional packing options Absolute Maximum Ratings Characteristic Symbol Notes Rating Unit Supply Voltage V See Power Derating section 26.5 V CC Reverse Supply Voltage V 18 V RCC Output Off Voltage V 24 V OUTOFF Continuous Output Current I 25 mA OUT Reverse Output Current I 50 mA ROUT Operating Ambient Temperature T Range L 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 Number Name Function 1 VCC Device supply 2 VOUT Device output 1243 3 Test Tie to GND, or float 4 GND Device ground Allegro MicroSystems, LLC 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com