Battery

Gauge

Charger

Boost Converter

MCU

Audio

Power Amp

Audio Processor

Pack Side

System Side

2

I C

Power

Copyright © 2017, Texas Instruments Incorporated

Figure 9-2. Wireless (Bluetooth) Speaker Application Block Diagram

9.2.1 Design Requirements (Default)

DESIGN PARAMETER

EXAMPLE

Cell Configuration

2s1p (2-series with 1 parallel)

Design Capacity

4400 mAh

Device Chemistry

100 (LiCoO2/graphitized carbon)

Cell Overvoltage at Standard Temperature

4300 mV

Cell Undervoltage

2500 mV

Shutdown Voltage

2300 mV

Overcurrent in CHARGE Mode

6000 mA

Overcurrent in DISCHARGE Mode

–6000 mA

Short Circuit in CHARGE Mode

0.1 V/Rsense across SRP, SRN

Short Circuit in DISCHARGE 1 Mode

–0.1 V/Rsense across SRP, SRN

Safety Over Voltage

4500 mV

Cell Balancing

Disabled

Internal and External Temperature Sensor

Enabled

Under Temperature Charging

0°C

Under Temperature Discharging

0°C

BROADCAST Mode

Enabled

9.2.2 Detailed Design Procedure

9.2.2.1 Setting Design Parameters

For the firmware settings needed for the design requirements, refer to the BQ28Z610-R1 Technical Reference

Manual.

• To set the 2s1p battery pack, go to data flash Configuration: DA Configuration register's bit 0 (CC0) = 1.

• To set design capacity, set the data flash value to 4400 in the Gas Gauging: Design: Design Capacity

register.

• To set device chemistry, go to data flash SBS 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 protect against cell overvoltage, set the data flash value to 4300 in Protections: COV: Standard Temp.

• To protect against cell undervoltage, set the data flash value to 2500 in the Protections: CUV register.

• To set the shutdown voltage to prevent further pack depletion due to low pack voltage, program Power:

Shutdown: Shutdown voltage = 2300.

BQ28Z610-R1

SLUSE07B – JANUARY 2020 – REVISED JANUARY 2022

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Product Folder Links: BQ28Z610-R1