CE

BAT

SRP

SRN

VSS

SDA/HDQ

SCL

INT

PULS

TS

BAT_SNS

PACK+

PACK-

+

-

Protector

IC

0.1 PF

1 m

Ÿ

Battery

100

Ÿ

100

Ÿ

Thermistor

10 k

Ÿ

1 µF

Tie to CPU for

direct control

NU

15

BQ27Z561-R1

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SLUSDH5 – MARCH 2019

Product Folder Links: BQ27Z561-R1

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Copyright © 2019, Texas Instruments Incorporated

9.1 Application Information

The BQ27Z561-R1 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-R1 Technical Reference

Manual (SLUUBY5). 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-R1 application schematic for a single-cell battery pack.

Figure 8. BQ27Z561-R1 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

Device Chemistry

Li-Ion

Design Voltage

4000 mV