1 Features

? Autonomous battery charging control, using a

dedicated MASTER mode I2C interface

? 400-kHz I2C bus communications interface,

including a 1.2-V logic level for high-speed

programming and data access

? Cell balancing with an internal bypass to optimize

battery health

? A high-side protection N-CH FET drive enables

serial bus communication during fault conditions

? Programmable protection levels for voltage,

current, and temperature

? Analog front-end with two independent ADCs

– Support for simultaneous current and voltage

sampling

– High-accuracy coulomb counter with input

offset error < 1 μV (typical)

? Supports down to 0.5-mΩ current sense resistor

while capable of 1-mA current measurement

? SHA-1 authentication responder for increased

battery pack security

? Compact 12-pin VSON package (DRZ)

2 Applications

? Tablet computing

? Portable and wearable health devices

? Portable audio devices

– Wireless (bluetooth) speakers

3 Description

The Texas Instruments BQ28Z620 device is a highly

integrated, accurate, 1-series to 2-series cell gas

gauge and protection solution, enabling autonomous

charger control and cell balancing.

The BQ28Z620 device enables autonomous charge

control through Master Mode I2C broadcasts of

charging current and voltage information, eliminating

software overhead that is typically incurred by the

system's host controller.

The BQ28Z620 device provides a fully integrated

pack-based solution with a flash programmable

custom reduced instruction-set CPU (RISC), safety

protection, and authentication for 1- to 2-series cell

Li-ion and Li-polymer battery packs.

The BQ28Z620 gas gauge communicates via

an I2C compatible interface and combines an

ultra-low-power, high-speed TI BQBMP processor,

high-accuracy analog measurement capabilities,

integrated flash memory, an array of peripheral

and communication ports, an N-CH FET drive, and

a SHA-1 Authentication transform responder into

a complete, high-performance battery management

solution.