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Battery monitor IC achieves ASIL-D compliance

Believed to be the first data acquisition system to achieve ASIL-D compliance for voltage, current, temperature and communication of a vehicle battery management system, the IC has an integrated current sense amplifier.

 

It is designed for integration within electric vehicles (EVs), hybrid electric vehicles (HEVs) and other transportation systems, for smart junction box, 48V and other automotive battery systems which can realise voltages up to 400V and above.

Battery systems must meet the safety requirements set by the ISO26262 guidelines. The MAX17852 is claimed to offer the highest accuracy for delivering voltage, current and temperature data with tight time synchronisation. It allows a typical cell voltage measurement of ±0.45mV at room temperature and a maximum of ±2mV error in a temperature range of five to 40°C, enabling car OEMs to get the most mileage range out of their batteries. It has a current sense amplifier capability of ±300mV, and a gain setting up to 256 times and 0.3% current sense gain error, for fast, accurate data for calculating power management, state of health and state of charge.

 

The 14-channel battery data acquisition system integrates a current sense amplifier so that current information is acquired at the same time as cell voltage and temperature. The IC allows both Hall effect sensor and shunt resistors to be used as sensing components.

An evaluation kit, the
MAX17852EVKIT# is also available.

 

 



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