Data acquisition system features 12-bit SAR ADC

The Maxim MAX17823B is designed for the management of high-voltage battery modules. The system features a 12-bit SAR ADC that can measure 12 cell voltages and two temperatures in 161μs.

There are 12 internal switches for cell-balancing and extensive built-in diagnostics. Up to 32 devices can be daisy-chained together to manage 384 cells and monitor 64 temperatures. Cell voltages of (0V to 5V) are measured differentially over a 65V common-mode range.

Cell measurements have a typical accuracy of 2mV (3.6V cell, 25°C). If oversampling is enabled, up to 128 measurements per channel can be averaged internally with 14-bit resolution.

The system can shut itself down in the event of a thermal overload by measuring its die temperature.

It uses Maxim's battery-management UART protocol for robust communications, and when used in conjunction with the MAX17880 12-channel battery monitor, it is ideal for automotive battery-management systems that require a high safety integrity level.

Applications for the MAX17823B high voltage data acquisition system include high-voltage battery stacks, electric vehicles (EVs), hybrid electric vehicles (HEVs), electric bikes, battery-backup systems (UPS), super-cap systems, and battery-powered tools.