9 Applications and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and TI

does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes. Customers should validate and test their design

implementation to confirm system functionality.

9.1 Application Information

The BQ27Z561-R2 gas gauge can be used with a 1-series li-ion/li-polymer battery pack. To implement and

design a comprehensive set of parameters for a specific battery pack, the user needs Battery Management

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 (SLUUC54). 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/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, will be 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.

PULS

INT

Li-Ion

Cell

SRP

SRN

R3

1mΩ–10mΩ

VSS

TS

RT1

103AT

BAT

BAT_SNS

SCL

SDA/HDQ

R1

10 Ω

R2

1 KΩ

C2

0.1 μF

C1

1.0 uF

CELLP

CELLN

C3

0.1 μF

SCL

SDA

BAT_SP

PACKN

PACKP

PACKN

C5

0.1 μF

C4

0.1 μF

BAT_SN

R8

100 Ω

R9

100 Ω

1

1

1

1

CE

CE

R2

1 KΩ

2

Highside Protection

Lowside Protection

Figure 9-1. BQ27Z561-R2 1-Series Cell Typical Implementation

9.2.1 Design Requirements (Default)

Design Parameter

Example

Cell Configuration

1s1p (1 series with 1 parallel)

Design Capacity

5300 mAh

www.ti.com

BQ27Z561-R2

SLUSE22 – SEPTEMBER 2020

Copyright © 2020 Texas Instruments Incorporated

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