Allegro MicroSystems ATS601 Single-Element Speed Sensor IC

Allegro Microsystems ATS601 Single-Element Speed Sensor IC is a unique addition to the Allegro™ camshaft sensor IC family of products. As a single-element, defined power-on state sensor IC, it provides first-falling-edge detection, direction/orientation insensitivity, and high-running-mode edge accuracy over the full operating range of air gap, speed, and temperature. The ATS601 consists of an optimized Hall IC and a simple magnetic pellet configuration.

The single-element Hall IC and magnetic pellet configuration switches in response to magnetic signals created by a ferromagnetic target. The IC contains a low bandwidth filter that increases the signal–to–noise ratio and noise immunity of the sensor IC. Sophisticated digital circuit design eliminates the detrimental effects of target geometry discontinuity, thermal gradients, and magnet and system offsets. Signal processing is used to achieve zero-speed performance, independent of the air gap. It is also used to dynamically adapt device performance to the typical operating conditions found in automotive applications, particularly camshaft sensing. The device's resulting output is a digital representation of the ferromagnetic target profile.

Features

Digital output representing the target profile
Single Hall element for twist-insensitive mounting and direction-insensitive polarity
True zero-speed operation
Defined power-on state
Air gap independent switch points
Chopper stabilized
Operation down to 3.3V

Factory programmable options
- Output polarity with low or high opposite tooth
- Startup hysteresis of 40G or 80G
- Threshold location of 30% or 50% from a signal peak
- Threshold update of a single tooth (continuous) or four-tooth memory
Fully synchronous digital logic with Scan Path and IDDQ testing