CE

BAT

VSS

SDA/HDQ

SCL

INT

PULS

TS

BAT_SNS

PACK+

PACK-

+

-

Protector

IC

Ba ery

Thermistor

10 k

1 µF

Tie to CPU for

direct control

NU

SRN

SRP

0.1 µF

RSENSE

1 m

RSRP

RSRN

Figure 9-2. BQ27Z561-R1 Typical Implementation with High-side Current Sensing

9.2.1 Design Requirements (Default)

Table 9-1. Default Design Requirements

Design Parameter

Example

Cell Configuration

1s1p (1 series with 1 parallel)

Design Capacity

5300 mAh

Device Chemistry

li-ion

Design Voltage

4000 mV

Cell Low Voltage

2500 mV

9.2.2 Detailed Design Procedure

9.2.2.1 Changing Design Parameters

For the firmware settings needed for the design requirements, refer to the BQ27Z561-R1 Technical Reference

Manual (SLUUBY5).

• To change design capacity, set the data flash value (in mAh) in the Gas Gauging: Design: Design Capacity

register.

• To set device chemistry, go to the data flash I2C Configuration: Data: Device Chemistry. The BQSTUDIO

software automatically populates the correct chemistry identification. This selection is derived from using the

BQCHEM feature in the tools and choosing the option that matches the device chemistry from the list.

• To set the design voltage, go to Gas Gauging: Design: Design Voltage register.

• To set the Cell Low Voltage or clear the Cell Low Voltage, use Settings: Configuration: Init Voltage Low

Set or Clear. This is used to set the cell voltage level that will set (clear) the [VOLT_LO] bit in the Interrupt

Status register.

BQ27Z561-R1

SLUSDH5B – MARCH 2019 – REVISED DECEMBER 2022

www.ti.com

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