UGN3056U

The UGN3056U has the following features including Senses Ferrous Targets Down to Zero RPM;Large Effective Air Gaps;Wide Operating Temperature Range;4.5 V to 18 V Supply Voltage Range;Fast Operation (100 kHz);Output Compatible with all Logic Families;Ideal for Automotive, Consumer and Industrial Applications;Integrated Reverse Battery Protection.

The Sprague Types UGN3056U Hall effect digital gear-tooth sensors is bipolar integrated circuits that switch ON and OFF in response to sufficiently large magnetic field differences created by passing ferrous targets. The sensor operates down to zero rpm over a wide range of air gaps and temperatures. When combined with a back-biasing magnet and a pole piece, either device can be configured to switch on either the leading or trailing edge of a passing gear tooth or slot. On-chip temperature compensation circuitry minimizes shifts in effective working air gaps and switch points over temperature, making these devices ideal sensors for ignition timing, anti-lock brake systerms and speed measurement in hostile automotive and industrial environments.A gear tooth sensing system consists of the sensor IC, a back-biasing magnet and pole piece, and a target (Fig. 1).The system requirements are usually specified in terms of the effective working air gap between the IC and the target (the gear teeth), the number of switching events per rotation of the target, temperature and speed ranges, minimum pulse width or duty cycle, and switch point accuracy. Careful choice of the sensor IC, magnet, and target promotes achievement of large working air gaps and good switch point accuracy over the system operating temperature range.

The IC output normally assumes a LOW state at power-up, and remains LOW when placed in the magnet!pole-piece assembly. The sensor measures differential flux by means of two Hall effect elements,Sensor 1 and Sensor 2, located 17 mils (0.43 mm) below the front surface of the IC package.On-chip temperature compensation circuitry minimizes switch point drift over temperature. At the system level, this translates into minimal shifts in effective working air gap and higher switch-point stability over the full operating temperature range.