Allegro Microsystems, LLC announced the launch of a new dual chip highly programmable linear Hall sensor IC a1346, which is an ideal solution for safety focused applications. A1346 integrates the advantages of complete chip redundancy and full diagnosis. The combination of these two features can achieve a higher level of diagnosis without interrupting the application (the diagnosis will cause the chip to be temporarily unresponsive). When the chip output is inconsistent (double output), the combination also enables the controller to determine which chip can be trusted. The new devices are mainly aimed at the automobile market. The terminal applications include torque detection of electric power steering system (EPS), brake (pedal travel, piston position, brake wear), transmission / clutch position detection, etc.
Allegro’s a1346 device has two high-precision programmable hall linear sensor ICs with open drain output, which are suitable for automobile and other applications. The signal path of a1346 has the flexibility of external programming, which can generate accurate and customized output from the input magnetic signal. A1346 is a particularly configurable and reliable solution for the most demanding linear field sensor applications.
Each BiCMOS monolithic integrated circuit system chip is integrated with: Hall sensor, precise temperature compensation circuit to reduce inherent sensitivity and zero drift of Hall element, small signal high gain amplifier, exclusive dynamic imbalance elimination circuit, advanced output linearization circuit and advanced diagnosis and testing function. The a1346 offers unparalleled customer reprogramming options.
One of the key characteristics of a1346 device is that it can generate high linear device output for nonlinear input magnetic field. Therefore, the device has a 16 segment customer calibration domain in which a unique linearization coefficient factor can be applied to each segment. The linearization coefficients are stored in the EEPROM lookup table.
In addition to saej2716, a1346 supports two proprietary sent protocols: ssent and asent. Both protocols enable users to connect up to four devices on a single sent line to reduce system costs. Ssent can provide sequential access for sensors connected to the same line. It is a very economic and effective method, which can maximize the bandwidth of a single sensor line and reduce the impact on system performance. Asent can randomly access all sensors on the same sent line. The two protocols allow each sensor on the same line to enter the diagnostic mode while other sensors continue to respond to queries, achieving the highest diagnostic coverage while maintaining 100% availability of the sensor solution.