BQ27750EVM-837

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Introduction

The BQ27750EVM-837 is an evaluation and demonstration board kit designed for the BQ27750 device, which is a single-chip gas gauge IC used to monitor and control the electric energy in single-cell Li+ battery packs. The BQ27750 device is a multi-purpose fuel gauge with highly integrated analog peripherals, dual modes of simultaneously support APR- and Coulomb counting algorithms, 8-bit A/D converter, built-in temperature sensor, data log that stores up to 32 battery information and more. The reliability and accuracy of the BQ27750 devicefulfils the measurement requirements of various applications.

Application Field

The BQ27750EVM-837 can be used in a wide range of applications including: portable computers, cell phones, PDAs, power tools, toys, smart garments, healthcare devices, automotive, lighting, and consumer electronics.

Working Principle

The BQ27750 device can accurately measure the battery’s remaining capacity in a non-intrusive way. It achieves this by measuring current from fuel-gauge, environmental temperature and voltage from the battery. This information is used to calculate the temperature-compensated voltage, temperature-compensated current, and previously logged battery information. The data is received from the two gauges, converted into a digital form and then summed and filtered, using a low-pass filtering technique. This information is stored in the battery information log, which helps detect events such as overcharging or over-discharging and can be used to calculate remaining capacity. The remaining capacity is calculated using a simple “best-fit” algorithm. This algorithm utilizes the previously logged information, measured temperature and voltage, and the current trends to predict the remaining capacity in real-time. The calculated remaining capacity can be used as an indication of how much charge is left in the battery.

Advantage

The BQ27750EVM-837 evaluation board offers a quick and easy to use platform for evaluating and testing the BQ27750 device. Evaluation of the device’s features is simplified using pre-assembled cables and programming tools. Experience the advantages of improved battery performance, accurate remaining capacity calculation, and quick and easy evaluation of the BQ27750 device by using the BQ27750EVM-837 evaluation board.

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