HallEffect Angle Sensor ICs for Motor Position Applications

The A1331 and A1334 from Allegro MicroSystems Europe are a family of contactless, Hall-effect based magnetic sensor ICs for high-speed motor position sensing in safety-critical automotive applications. Allegro’s dual-die A1331 and A1334 angle sensor ICs are based on vertical Hall-effect technology with system-on-chip architecture that provides fast output refresh rates and low signal path latency.

Each device is offered in a TSSOP-24 package that contains two individually sawn, electrically isolated silicon ICs. The dual-die feature makes them suitable for use in safety-critical applications that require the use of redundant sensor ICs, especially in ASIL compliant automotive systems. The A1334 is also offered in a single die configura-tion in the TSSOP-14 package for applications that do not require redundancy.

Typical applications include electronic power steering or power braking motor position sensing, transmission actuator position sensing, throttle/pedal position detection, and other systems that require ac-curate measurement of angular or rotary position.

The A1331 and A1334, with their onboard digital signal processing functions and EEPROM for factory and customer programmability, are designed specifically for on-axis/end-of-shaft angle sensing applications that require ultra-fast output refresh rates and low signal path latency.

These sensor ICs include a 4-wire 10 MHz SPI interface with a 25 µs output refresh rate and a nominal signal path latency of only 60 µs. In addition, the ICs can operate directly off a vehicle battery, supporting a wide 4.5-14.5 V supply voltage range while consuming just 10 mA (maximum) of supply current per silicon die. They also include signal path and I/O diagnostics designed to meet the stringent needs of ASIL safety requirements.

About Allegro MicroSystems

Allegro MicroSystems, LLC is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro’s innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Allegro MicroSystems Europe, headquartered in Chertsey, United Kingdom, is the European sales and marketing operation, and operates a network of representatives and distributors throughout Europe. Allegro also has an engineering design centre in Edinburgh in Scotland and an application and marketing centre in Annecy in France.