Abstract

BQ76905, BQ76907 is a BMS analog front-end device, supporting 2-7S battery packs. The device has many advantages such as high-sampling accuracy, low-power consumption, rich-protection functions, support for out-of-order power-on, integrated low-side driver, integrated LDO and internal balancing circuit, and is widely used in BMS designs for vacuum cleaners, power tools, drones, and other applications. However, many are often confused about our internal voltage sampling cycle when first using the device. To improve the efficiency of designing designs using this device, this article uses a combination of pictures and text to help understand the voltage sampling logic of BQ76905, BQ76907 more clearly and intuitively.