BQ40Z60_16 Datasheet, PDF (19/47 Pages) Texas Instruments – Programmable Battery Management Unit

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9 Detailed Description
bq40z60
SLUSAW3C – DECEMBER 2014 – REVISED JULY 2015
9.1 Overview
The bq40z60 is a fully integrated battery manager that employs flash-based firmware and integrated hardware
protection to provide a complete solution for 2-series to 4-series cell battery stack architectures. The bq40z60
interfaces with a host system via an SBS v1.1-compliant, SMBus interface, and processes instructions and data
using a state-of-the-art, ultra-low-power TI bqBMP CPU. High-performance, integrated analog peripherals allow
support for a sense resistor down to 3 mΩ, battery charge control, and simultaneous current/voltage data
conversion for instant power calculations.
The bq40z60 controls the cell charging profile based on user-programmed data flash parameters for charging
current and voltage based on temperature and cell voltage. The gas gauge provides the cell voltage and
charging information to the battery charging through an internal communication bus. The charger function is
controlled based on cell voltage measurements both on individual cell and total series stack readings.
The analog front end provides this voltage-based information to the charging circuit to set the profiles pre-
programmed in the data flash settings, which are useful for zero voltage and PRECHARGE mode operation. The
following sections detail all of the major component blocks in the bq40z60 device.
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