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

11

BQ27Z561-R1

www.ti.com

SLUSDH5 – MARCH 2019

Product Folder Links: BQ27Z561-R1

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Copyright © 2019, Texas Instruments Incorporated

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 BQ27Z561-R1 Processor

The BQ27Z561-R1 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-

R1 processor supports variable instruction lengths of 8, 16, or 24 bits.

8.3.2 Battery Parameter Measurements

The BQ27Z561-R1 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.

8.3.2.1 Coulomb Counter (CC)

The first ADC is an integrating analog-to-digital converter designed specifically for tracking charge and discharge

activity, or coulomb counting, of a rechargeable battery. It features a single-channel differential input that

converts the voltage difference across a sense resistor between the SRP and SRN terminals with a resolution of

3.74 µV.