Allegro MicroSystems ATS19480 GMR Transmission Speed Sensor IC

Allegro MicroSystems ATS19480 Giant Magnetoresistance (GMR) Transmission Speed Sensor IC provides a user-friendly two-wire solution for applications requiring speed information using ferromagnetic gear tooth targets. The fully integrated component includes the GMR IC, a protection capacitor for EMC robustness, and a back-bias magnet in a single in-line, lead-free, 3-pin SIP package with an additional molded lead-stabilizing bar for robust shipping and ease of assembly.

The ATS19480 is designed for ferromagnetic gear tooth targets and is orientation-compatible with Hall-effect technology. The fully integrated solution senses large operating air gaps over an extensive air gap range. State-of-the-art GMR technology on a monolithic IC with industry-leading signal processing provides accurate speed information in response to low-level differential magnetic signals. The differential sensing offers inherent rejection of interfering common-mode magnetic fields.

The Allegro MicroSystems ATS19480 GMR Transmission Speed Sensor IC provides integrated diagnostics to detect an IC failure that would
impact output protocol accuracy, providing coverage compatible with ASIL B (assessment pending). Built-in EEPROM scratch memory offers traceability of the device throughout the IC’s product lifecycle. ASIL reporting can be enabled or disabled depending on the applications’ needs.

Features

Fully integrated solution in a single in-line overmolded 3-lead SIP package
- GMR IC
- Protection capacitor
- Back-bias magnet
Innovative GMR technology provides large operational air gap sensing on ferromagnetic targets
Orientation compatible with Hall-effect technology

Advanced algorithms for flexible design-in and system compensation, automatically adapts to extreme mechanical changes (air gap) and thermal drifts
Measures differentially to reject common-mode stray magnetic fields
Integrated ASIL diagnostics and certified safety design process (optional fault reporting)

Applications

Gear tooth sensing
Transmission
Applications requiring speed and direction capabilities

Specifications

28V maximum supply voltage, 4V to 24V range
3.95V maximum undervoltage lockout
Zener clamp voltages
- 28V minimum supply
- -18V maximum reverse supply
-10mA minimum reverse supply current
Supply current
- 5.9mA to 8mA low-current state
- 12mA to 16mA high-current state
1.9 minimum supply current ratio
1.5mA to 3.9mA ASIL safety current range
10nF nominal capacitance
1ms maximum power-on time
0 to 4μs output rise/fall time, 2μs typical

4ms to 8ms pulse width range, fault
0 to 12kHz operating frequency
1.5mm to 4.5mm operational air gap range, 0.5mm to 1.5mm extended range
±4mm total air gap variation during operation
70% typical operate point
30% typical release point
0.25mm typical tooth-to-tooth variation
±10% output duty cycle tolerance
150°C/W package thermal resistance
Temperatures
- -40°C to +150°C operating ambient range
- +165°C maximum junction
500G maximum externally applied magnetic flux density

Allegro MicroSystems ATS19480 GMR Transmission Speed Sensor IC

Features

Applications

Specifications

Typical Application

Block Diagram

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