Designers of automotive battery management systems (BMS) can now deliver the highest level of safety for voltage, current, temperature, and communication while also saving space and reducing solution cost, with the MAX17852 14-channel, high-voltage, ASIL-D data-acquisition system from Maxim Integrated Products, Inc. Designed for integration within electric vehicles, hybrid electric vehicles, and other transportation systems, the IC is ideal for smart junction box, 48V and other automotive battery systems which can see voltages up to 400V and beyond.
OEMs and electric vehicle manufacturers require that all battery systems meet the highest safety requirements set by the ISO26262 guidelines. Through comprehensive diagnostics and a safety-driven architecture, Maxim Integrated designed and manufactured the MAX17852 to enable customers to design their systems to meet the highest ASIL-D standards for voltage, current, temperature, and communication. The small, cost-effective IC also offers the highest accuracy for delivering voltage, current, and temperature data with tight time synchronization. It allows a typical cell voltage measurement of ±0.45mV at room temperature and a maximum of ±2mV error in a temperature range of 5 degrees to 40 degrees Celsius, enabling car OEMs to get the most mileage range out of their batteries.
With a current sense amplifier capability of +/-300mV, and a gain setting up to 256 times and 0.3 percent current sense gain error, the MAX17852 provides the fastest, most 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 MAX17852 allows both hall effect sensor and shunt resistors to be used as sensing components.
Highest Safety: ASIL-D rating for voltage, current, temperature, and communication enhances safety
Highest Accuracy: Measurement accuracy with best current sense amplifier gain error to allow accurate, time-aligned current measurements to potentially boost mileage
Smaller Size: High integration enables up to 16 percent smaller size than a discrete solution to save board space
Lower Cost: Integrated current sense amplifier provides up to 20 percent cost savings
Versatility: The first device that can be adapted to many applications with voltage, current, and temperature sensing
The MAX17852 is available at Maxim’s website for $7.52 (1000-up, FOB USA); also available from authorized distributors. The MAX17852EVKIT# evaluation kit is available for $250