Design a cell-monitoring system to optimize accuracy, lower costs, or both: Page 10 of 10

December 02, 2013 //By Jeremy Georges
Design a cell-monitoring system to optimize accuracy, lower costs, or both
Jeremy Georges, MTS, Maxim Integrated discusses cell-measurement architectures for cell balancing and battery-measurement applications and presents example designs that meet diverse accuracy and cost requirements.
the design, then Cell B4 in the “Total Error Calculations” worksheet in the Error Measurements spreadsheet must be changed to 4.5V to account for the higher reference voltage. A complete schematic, layout, and Bill of Materials for this architecture can be found in the data sheet for the MAX14921EVKIT.

2 The MAX14920 will monitor up to 12 cells and provide the same high accuracy.

3 See the Typical Operating Characteristics in the MAX14920/MAX14921 data sheet.

4 If a low-cost 3.3V voltage reference with higher accuracy than the MAX6034B is needed for an application, the MAX6034A voltage reference is recommended.

5 Please refer to the Cost-Optimized Architecture section for analysis of the impact of the voltage-divider on accuracy.

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