8 Detailed Description

8.1 Overview

The BQ28Z610-R1 gas gauge is a fully integrated battery manager that employs flash-based firmware and

integrated hardware protection to provide a complete solution for battery-stack architectures composed of 1- to

2-series cells. The BQ28Z610-R1 device interfaces with a host system via an I2C protocol. High-performance,

integrated analog peripherals enable support for a sense resistor down to 1 mΩ and simultaneous current/

voltage data conversion for instant power calculations. The following sections detail all of the major component

blocks included as part of the BQ28Z610-R1 device.

8.2 Functional Block Diagram

The Functional Block Diagram depicts the analog (AFE) and digital (AGG) peripheral content in the BQ28Z610-

R1 device.

Cell

Balancing

Over

Current

Comparator

Short Circuit

Comparator

Power On

Reset

Voltage

Reference 2

Watchdog

Timer

Zero Volt

Charge

Control

Wake

Comparator

Internal

Temp

Sensor

AFE Control

ADC MUX

Cell Detach

Detection

Cell, Stack,

Pack

Voltage

Voltage

Reference1

SDA

SRP

High Side

N-CH FET

Drive

Power Mode

Control

Low

Frequency

Oscillator

ADC/CC

FRONTEND

1.8V LDO

Regulator

AD0/ RC0 (TS1)

SRN

AFE COM

Engine

DMAddr (16bit)

High

Frequency

Oscillator

COM

Engine

AFE COM

Engine

I/O &

Interrupt

Controller

Data Flash

EEPROM

ADC/CC

Digital Filter

Program

Flash

EEPROM

In-Circuit

Emulator

bqBMP

CPU

Timers &

PWM

PMAddr

(16bit)

PMInstr

(8bit)

Low Voltage

I/O

Data

SRAM

Data (8bit)

I/ O

NTC Bias

Internal

Reset

Interrupt

SCL

Copyright © 2016, Texas Instruments Incorporated

BQ28Z610-R1

SLUSE07B – JANUARY 2020 – REVISED JANUARY 2022

www.ti.com

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