Precision Hall-effect angle sensor ICs

Designed for demanding automotive and industrial applications

Allegro MicroSystems: New from Allegro MicroSystems Europe, the A1332 and A1334 are a family of high-resolution 360° angle sensor ICs based on magnetic circular vertical Hall (CVH) technology.

The A1332, with an onboard 32-bit processor and EEPROM for factory and customer programmability, includes segmented and Fourier linearisation functions for supporting challenging off-axis/side-shaft magnetic sensing configurations that are commonly found in electronic power steering and transmission applications. The A1332 also supports on-axis/end-of-shaft magnetic sensing configurations, and can produce high-accuracy angle measurements with an output refresh period of 32 µs. The device incorporates a 2-wire I²C digital interface with signal path and I/O diagnostics for achieving higher reliability to meet ASIL automotive safety requirements.

The A1334, with its onboard digital signal processing functions and EEPROM for factory and customer programmability, is designed specifically for on-axis/end-of-shaft applications that require ultra-fast output refresh rates and low signal path latency. Its 4-wire 10 MHz SPI interface offers a 25 µs output refresh period and a nominal signal-path latency of only 60 µs. In addition, the A1334 can operate directly off a vehicle battery, supporting a wide 4.5-14.5 V supply voltage range, while consuming just 10 mA (max) of supply current. Like the A1332, the A1334 includes signal-path and I/O diagnostics for achieving ASIL safety requirements.

Both devices can operate in a low RPM mode, to support up to 12 bits of output resolution in lower angular velocity applications, and in a high RPM mode to support situations demanding faster refresh rates and lower single-path latency.

As part of their signal processing functions, the ICs include automotive-grade temperature compensation to provide accurate angle measurements over the full operating temperature and voltage range of the devices. The A1332 and A1334 are also air-gap independent over a wide magnetic field range, and can operate over a 300-1000 Gs magnetic target field level, making them less sensitive to stray fields and ensuring high levels of accuracy. The on-chip EEPROM technology also enables flexible programming of end-of-line calibration parameters.

The A1332 and A1334 operate over the -40° to +85°C and -40° to +150°C temperature ranges, respectively, and are each available as a single die in a 1 mm thin 14-pin TSSOP (LE suffix) package. For ISO26262 ASIL D safety critical systems requiring sensor redundancy, the A1334 will also be supplied in a dual die TSSOP-24 package. All packages are lead (Pb) free with 100% matt tin leadframe plating.

About Allegro
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. Further information about Allegro can be found at www.allegromicro.com

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.