8 Detailed Description

8.1 Overview

The BQ27Z561-R2 gas gauge is a fully integrated battery manager that employs flash-based firmware to provide

a complete solution for battery-stack architectures composed of 1-series cells. The BQ27Z561-R2 device

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

BQ27Z561-R2 device.

8.2 Functional Block Diagram

Internal

Temp

Sensor

ADC MUX

SCL

SDA/HDQ

REG18

DMAddr (16bit)

HFO

COM

Engine

Data Flash

4-kBytes

CC /ADC

Digital

Filter

Program Flash

32-kBytes

bqBMP

CPU

PMAddr

(16 bit)

PMInstr

( 8 bit)

Data SRAM

2-kBytes

Data (8bit)

CC

SRP

SRN

ADC

Timers

IO and

Interrupt

Controller

REF2

BAT

PULS

INT

REF1

LFO

CE

ROM

12-

kBytes

Test

Interface

BAT_SNS

TS

GPIO

VSS

Copyright © 2017, Texas Instruments Incorporated

8.3 Feature Description

8.3.1 BQ27Z561-R2 Processor

The BQ27Z561-R2 device uses a custom TI-proprietary processor design that features a Harvard architecture

and operates at frequencies up to 4.2 MHz. Using an adaptive, three-stage instruction pipeline, the BQ27Z561-

R2 processor supports variable instruction lengths of 8, 16, or 24 bits.

8.3.2 Battery Parameter Measurements

The BQ27Z561-R2 device measures cell voltage and current simultaneously, and also measures temperature to

calculate the information related to remaining capacity, full charge capacity, state-of-health, and other gauging

parameters.

www.ti.com

BQ27Z561-R2

SLUSE22 – SEPTEMBER 2020

Copyright © 2020 Texas Instruments Incorporated

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