Hall effect linear current sensor launched

Louise Smyth

Allegro MicroSystems has launched its latest Hall effect current sensor IC, which delivers its highest speed and accuracy in >400A sensing applications to date. Suited for hybrid and electric vehicle inverter applications that need high accuracy sensing to 1000Amps or more, the ACS70310 offers diagnostic functions that can help improve functional safety and reliability.

The ACS70310 linear current sensor achieves +/-1.2% sensitivity and +/-5mV of offset error over the temperature range of –40°C to 150°C. By providing both short circuit and over-current detection, it delivers an analog output voltage proportional to the applied magnetic field. Providing improved safety, the output of the ACS70310 has a response time of 2 micro seconds and a typical operating bandwidth of 240kHz.  

This current sensor IC is also extremely robust. The on-board supply regulator enables the supply pin to survive voltages of +/-18V to protect against reverse battery connection, and the output pin can survive voltages of +16 to -6V for defence against harsh automotive voltage transients.  

It is field programmable by the customer to optimise both the sensitivity and offset after assembly into the final system. Several other parameters are also programmable. Customers can also order Allegro-programmed devices and conduct fast and efficient software calibration of both sensitivity and offset using their system microcontroller.  

It incorporates a highly sensitive Hall element with a BiCMOS interface integrated circuit that employs a low noise, small-signal high-gain amplifier, as well as a low-impedance output stage, and a proprietary, high bandwidth dynamic offset cancellation technique.

The IC is provided in a thin case,1 mm thick, 4-pin SIP (single in-line package, suffix KT) that is lead-free, with a matt-tin lead frame plating. Recently the firm has updated its switch range