bq2083 and bq2085 Board Offset Charaterization and Compensation

The bq208x (bq2083, bq2084, and bq2085) products are high-precision advanced gas gauge products for battery monitoring and management. Because the current signal is measured through a small sense resistor (< 20 m?? to minimize power loss, compensation for the ADC input offset is critical for the accuracy of the measurement. This application note discusses common issues associated with board offset characterization, data analysis, and data flash configuration. The article uses bench data in the step by step description. Layout guidelines for low board offset are discussed at the end of the article.