Allegro MicroSystems A19351 GMR Wheel Speed/Direction Sensor ICs

Allegro MicroSystems A19351 Giant Magnetoresistance (GMR) AK Protocol Wheel Speed/Direction Sensor Integrated Circuits (ICs) are designed to measure ring magnets used in automotive braking systems. A19351 ICs provide wheel speed and direction information. The fully integrated circuits feature sensing elements, voltage regulators, analog-to-digital converters, and a digital controller. These components adaptively measure the magnetic signal and provide a robust, low-jitter AK Protocol output across a two-wire interface.

The high-performance A19351 GMR ICs feature Allegro’s SolidSpeed Digital Architecture, a mixed-signal speed sensor architecture for highly adaptive performance. This architecture provides a wide dynamic range of operating air gap and compensates for temperature drift effects. Flexibility is passed to the system integrator, enabling looser mechanical constraints with the wide operating air gap.

The A19351 is provided in a 2-pin SIP package (suffix UB) that is lead (Pb) free, with tin leadframe plating. The UB package includes an IC and protection capacitor integrated into a single overmolded package, with an additional molded lead-stabilizing bar for robust shipping and easy assembly.

Features

GMR elements provide highly repeatable and ultra-low jitter signals for iTPMS and ADAS applications
Wide Air Gap capability eases mechanical mounting tolerance requirements
AK Protocol-compliant output with air gap information
SolidSpeed Digital Architecture provides robust, adaptive performance with advanced algorithms

ISO 26262 ASIL B(D) with integrated diagnostics and certified safety design process (pending assessment)
Lead (Pb) free 2-pin SIP package (suffix UB) with tin leadframe plating
RoHS compliant

Specifications

Voltages
- 5.5V to 24V supply range, 28V maximum
- 3.5V maximum undervoltage lockout
- -16.5V reverse supply
- 1.6V to 2V UVLO hysteresis
- 28V minimum supply Zener clamp
Supply currents
- -10mA minimum reverse
- 5.88mA to 8.4mA low-current state range, 7mA typical
- 11.76mA to 16.8mA mid-current state range, 14mA typical
- 23.52mA to 33.6mA mid-current state range, 28mA typical
Fault current
- 1mA to 3.8mA range
- 4ms to 7ms duration range
8mA/µs to 28mA/µs output rise, fall slew rate
1ms power-on time
Temperatures
- -40°C to +160°C operating ambient range
- +175°C maximum junction
- -65°C to +170°C storage range

500G maximum applied magnetic flux density (in any direction)
2.2nF nominal capacitance for the internal discrete capacitor
AK Protocol option
- 40µs to 60µs bit width range, 50µs typical
- 105ms to 195ms standstill period range, 150ms typical
- 3.6G typical air gap reserve level
Input
- 0 to 4kHz operating frequency
- 2.7G minimum operating differential magnetic input
- ±900G operating differential magnetic range
- ±40G allowable user-induced differential offset
- 60% typical operating point
- 40% typical release point
- 0.02% typical repeatability
- 20%pk-pk minimum switch point separation
Thermal
- 0.2%/°C typical magnetic temperature coefficient
- 213°C/W typical package thermal resistance

Allegro MicroSystems A19351 GMR Wheel Speed/Direction Sensor ICs

Features

Specifications

Block Diagram

Application Circuit

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