Studio (BQSTUDIO), which is a graphical user-interface tool installed on a PC during development. The firmware

installed in the product has default values, which are summarized in the BQ27Z561-R2 Technical Reference

Manual. Using the BQSTUDIO tool, these default values can be changed to cater to specific application

requirements during development once the system parameters, such as enable and disable of certain features

for operation, cell configuration, chemistry that best matches the cell used, and more are known. The final flash

image, which is extracted once configuration and testing are complete, is used for mass production and is

referred to as the "golden image."

9.2 Typical Applications

The following is an example BQ27Z561-R2 application schematic for a single-cell battery pack.

CE

BAT

SRP

SRN

VSS

SDA/HDQ

SCL

INT

PULS

TS

BAT_SNS

PACK+

PACK-

+

-

Protector

IC

0.1 F

RSENSE

1 m

Ba ery

RSRN

RSRP

Thermistor

10 k

1 µF

Tie to CPU for

direct control

NU

Figure 9-1. BQ27Z561-R1 Typical Implementation with Low-side Current Sensing

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BQ27Z561-R2

SLUSE22B – FEBRUARY 2020 – REVISED NOVEMBER 2022

Copyright © 2022 Texas Instruments Incorporated

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