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Orientation-Independent Back-Bias AK Protocol Wheel Speed Sensor IC

ATS604

The ATS604 is a back-bias speed sensor that measures rotating ferrous targets and outputs speed and direction information over the two-wire AK Protocol. The sensor features a patented orientation-independent architecture that allows it to be rotated in any direction to the target, simplifying system assembly.

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Description

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The ATS604 is an advanced gear tooth sensor designed for automotive wheel speed sensing applications. Featuring a patented orientation-independent differential magnetic sensing architecture, the integrated circuit (IC) face can be rotated with any angle, allowing for full flexibility in installation angle.

Using the AK protocol, the ATS604 encodes speed and direction information on a current-modulated two-wire interface. The IC also transmits the measured temperature, air gap information, and selected channels, providing superior system information to the controller. Sophisticated algorithms minimize the amount of rotation until first pulses after power-up through the use of internally writable non-volatile memory.

The ATS604 was developed in accordance with ISO 26262 with ASIL B(D) capability for use in automotive safety-related systems when integrated and used in the manner prescribed in the applicable safety manual and datasheet.

  • Orientation independence allows installation at any angle
  • Optimized auto-calibration maximizes startup performance
  • AK Protocol output reports speed, direction, air gap, and temperature information
  • Measures down to zero speed
  • ISO 26262 ASIL B(D) with integrated diagnostics and certified safety design process
  • Heavy truck wheel sensing
  • Supports autonomous ADAS features 
  • Variable-reluctance sensor replacement

The ATS604 is provided in a 3-pin SIP package (suffix SN) that is lead (Pb) free, with tin leadframe plating. The SN package includes an IC, magnet, and capacitor integrated into a single overmold, with an additional molded lead-stabilizing bar for robust shipping and ease of assembly.

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Documentation

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Documents Found: 32
Document Type Document Name
Application Note
Fundamental Properties of Speed Sensors
Application Note
Understanding Input Signal Variation in Sensor ICs with SolidSpeed Digital Architecture
Application Note
Wheel Speed Sensors Operating in Harsh Environments