Allegro MicroSystems has announced the launch of a highly accurate, programmable linear Hall-effect current sensor IC for electric vehicle power trains and automotive battery management systems. The ACS37601 current sensor is designed for applications requiring a measurement capability greater than 200A, making it ideal for use in high-power electric vehicles.
The programmable linear Hall-effect current sensor IC can measure the current flowing through a conductor using the Hall effect principle. The sensor contains a Hall-effect sensor, a signal conditioner, and an amplifier on a single chip. The signal conditioner and amplifier convert the Hall voltage signal into a proportional output voltage that is linearly proportional to the measured current.
The ACS37601 sensor is highly accurate, with a sensitivity error of 0.8% and an offset error of less than ±5mV over the automotive temperature range. It operates over a wide temperature range from -40 to +150°C and from 5V or 3.3V. The output is ratiometric with the supply voltage, making it suitable for use in a wide range of applications.
For dc battery charging and high-frequency inverters, the bandwidth spans dc to 240kHz, and the response time is just 2μs. The sensor also includes a dedicated programmable pin for over-current and over-temperature indication, making it ideal for use in safety-critical applications.
The Allegro ACS37601 current sensor is not yet in production, but samples are available in the company’s 1mm thick four-pin single-in-line ‘KT’ package with straight or formed leads. Two parts are planned, one factory-programmed to 500μV/G at 5V and the other 1mV/G.