Allegro MicroSystems ATS19200 Wheel Speed Gear Tooth Sensor ICs
Allegro MicroSystems ATS19200 Wheel Speed Gear Tooth Sensor ICs are optimized Hall-effect ICs, rare-earth pellets, and high-temperature ceramic capacitors in a single overmolded package, reducing the need for external EMC protection. The ATS19200 is provided in a lead-free 3-pin back-biased SIP package (suffix SN) with tin leadframe plating. The user-friendly solution provides true zero-speed digital gear tooth sensing in two-wire applications, such as automotive or two-wheeler braking systems.
The single-integrated circuit incorporates a dual-element Hall-effect sensor IC and signal processing circuitry that switches in response to differential magnetic signals created by a rotating ferromagnetic target. ATS19200 ICs contain a sophisticated compensating circuit to eliminate magnetic and system offsets. Analog signal digital tracking facilitates high pitch and duty cycle accuracy. Advanced calibration algorithms adjust the device gain and offset at power-up. The algorithm adjustment results in air gap independent switch points that greatly improve output accuracy and mitigate the effect of system anomalies, such as target vibration and sudden changes in the air gap.
The Allegro MicroSystems ATS19200 Wheel Speed Gear Tooth Sensor ICs offer integrated diagnostics to detect an IC failure that impacts the output protocol’s accuracy, providing coverage compatible with ASIL B(D) compliance. Built-in EEPROM scratch memory offers traceability of the device throughout the IC’s production process.
Features
- Integrated back-bias magnet for ease of design-in with ferromagnetic gear targets
- Integrated capacitor in a single overmolded package provides greater EMC robustness
- Advanced threshold switching algorithm supporting pitch and duty cycle high accuracy over the operating air gap range
- ASIL B(D) rating based on integrated diagnostics and certified safety design process
- EEPROM offers device traceability throughout the production process
- Two-wire current source output supporting speed and ASIL protocol
- 3-pin SIP (suffix SN) package
- Lead-free
Applications
- Anti-lock Braking Systems (ABS)
- Electronic Stability Control (ESC)
Specifications
- 28V maximum supply voltage, 4V to 24V range
- -18V maximum reverse supply voltage
- -10mA minimum reverse supply current
- 3.95V maximum undervoltage lockout, 3.5V typical
- 28V minimum supply Zener clamp voltage
- 19mA maximum supply Zener current
- Supply current ranges
- 5.9mA to 8.4mA low-current state
- 12mA to 16mA high-current state
- 1.9 minimum supply current ratio
- 1.0mA to 3.3mA ASIL safety current range
- 0 to 1.5μs output rise/fall time range
- 0 to 5kHz operating frequency range
- 60% typical operate point
- 40% typical release point
- -40°C to +150°C operating ambient temperature range
- 2.2nF nominal capacitance (internal discrete capacitor)
Block Diagram
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