Ah3194 Gear Tooth Speed Sensor

1 Features and Benefits
△ Zero speed detection
△ 10 bit A/D converter in the chip
△ Internal short circuit protection
△ No chopping delay
△ Self-adaptive to magnetic field change
△ Operating temperature range -40ºC~125ºC
△ Developed according to EU RoHs & REACH

2 Application Examples
△ Geartooth Sensor
△ Speed Sensor
△ Camshaft Sensor
△ Direction Detection

AH3194 is a gear speed sensor with self-adaptive adjustment and digital output function. It's a kind of special automotive gear sensor, but also be suitable for ordinary speed measurement applications. Only one piece Hall element inside the sensor, so no problem of the rotation alignment exists. In addition, it has a 10 bit A/D converter and the logic controller, and another independent 4 bit A/D converter inside it. After two A/D respectively sample and comparison operate to Hall element signals, it can achieve the gear tooth identification. When it works, it needs to put S pole of the magnet to face the back of the product, and magnetic field strength range can from 50mT to 500mT.