ATS19580: Allegro’s Industry-leading Back-Biased GMR Transmission Speed & Direction Sensor

Allegro Microsystems has been continued providing motion control and energy efficient systems with the globally leading power and sensing solutions. The ATS19580 is the latest addition to the Allegro’s transmission speed & direction sensor family. ATS19580 is the industry’s first fully integrated back-biased GMR (Giant Magnetoresistance) transmission speed and direction sensor. ATS19580 is the result of monolithically integrating Allegro’s proprietary GMR technology with the leading digital processing to achieve the highest level of in-system performance while further reducing the system size, complexity and cost. The ultimate goal is to greatly improve fuel economy and emission of green house gases.

According to Allegro Microsystems, the ATS19680 realizes the optimal performance of a transmission sensor to date, thanks to the latest GMR technology and Allegro’s leading transmission algorithms and packaging.

The ATS19580 offers the following advantages:

  • The widest dynamic range of operating air gap (50% larger)
  • Industry-leading vibration immunity
  • EMC protection
  • Robust to common-mode stray fields
Allegro Microsystems Industry Leading Large Air Gap Speed Sensing Technology

It shows the new ATS19580 has the most capable air gap performance that is improved by 50% compared to sensors based on Hall Effect technology. As the air gap increases, it offers advantages such as installation flexibility and reduced cost. At the same time, it presents challenges such as vibration disturbance and common-mode stray fields. ATS19580 has the state-of-the-art technology to process the noise caused by intermittent vibration based on Allegro’s industry leading dynamic compensation algorithm, which ensures stable output even when the system is under transient abnormal situations. The sensor is also capable of suppressing the common-mode stray fields with the differential signal measuring technique.


ATS19580 is RoHS compliant lead-free component. The sensor is housed in a 3-pin SIP package with the lead frame plating. The device has the integrated diagnostics that is used to detect an IC failure that impact output protocol accuracy, providing coverage compatible with ASIL B. ATS19580 has on-chip EEPROM scratch memory store critical information throughout the IC’s lifespan and the ASIL reporting can be enabled or disabled as a product offering.

The GMR-based ATS19580 is designed for use with ferromagnetic gear tooth targets and is orientation compatible with Hall-Effect technology.

Allegro Microsystems ATS19580 GMR Sensor for Transmission Gear Speed and Direction

The ATS19580 has three pins, VCC, OUT and GND. The VSUPPLY is applied across Pin 1 VCC and Pin 3 GND in the range from 4V up to 24V. The device will be locked out at by the built-in diagnostics if the supply voltage is below the undervoltage threshold 3.95V. The internal protection has the minimum supply Zener clamp voltage at 28V with forward polarity and -18V with reverse polarity.


The output signal consists of the direction pulses and non-direction pulses. Allegro offers three options for different pulse widths. For the narrow pulse width option, the pulse width of forward rotation direction is typically 45us, the pulse width of reverse rotation is typically 90us and the width of non-direction pulses is typically 180us. For the wide pulse width option, the width for forward rotation pulse is still 45us, and the widths of the other two types of pulses are doubled, at 180us and 360us respectively. For the intermediate pulse width option, the widths for the forward rotation, reverse rotation and non-direction pulses are 60us, 120us and 30us respectively.

Allegro Microsystems ATS19580 Output Pulse Width Options
Share What You’ve Learned

Leave a Reply