5 Description (continued)

The integrated SHA-256 functionality helps enable secure identification between systems and packs. The

interrupt and BTP functions facilitate the BQ27Z561-R2 device to inform the system when a specific state-of-

charge (SOC), voltage, or temperature condition occurs. The low-voltage operation enables the system to

continue monitoring the battery even in deeply discharged conditions. During low-activity situations, the device

can be set to the low power coulomb counting (CC) mode, which enables the device to continue its coulomb

counting while reducing operating current significantly.

6 Pin Configuration and Functions

1

2

3

D

C

B

A

Not to scale

SRP

BAT

CE

SRN

BAT_SNS

NU

TS

VSS

SCL

INT

PULS

SDA/HDQ

Figure 6-1. Pin Diagram

Table 6-1. Pin Functions

PIN

TYPE(1)

DESCRIPTION

NAME

NO.

BAT

D2

P

Battery voltage measurement input. Kelvin battery sense connection to BAT_SNS. Connect a

capacitor (1 µF) between BAT and VSS. Place the capacitor close to the gauge.

CE

D3

I

Active-high chip enable

BAT_SNS

C2

AI

Battery sense

INT

A1

O

Interrupt for voltage, temperature, and state of charge (programmable active high or low)

PULS

A2

O

Programmable pulse width with active-high or -low option

TS

B1

AI

Temperature input for ADC

NU

C3

NC

Makes no external connection

SCL

B3

I/O

Serial clock for I2C interface that requires an external pullup when used. It can be left floating if

unused.

SDA/HDQ

A3

I/O

Serial data for I2C interface and one-wire interface for HDQ (selectable) that requires an external

pullup when used. It can be left floating if unused.

SRP

D1

I

Analog input pin connected to the internal coulomb counter peripheral for integrating a small

voltage between SRP (positive side) and SRN

SRN

C1

I

Analog input pin connected to the internal coulomb counter peripheral for integrating a small

voltage between SRP (positive side) and SRN

VSS

B2

P

Device ground

(1)

P = Power Connection, O = Digital Output, AI = Analog Input, I = Digital Input, I/O = Digital Input/Output, NU = Not Used

www.ti.com

BQ27Z561-R2

SLUSE22B – FEBRUARY 2020 – REVISED NOVEMBER 2022

Copyright © 2022 Texas Instruments Incorporated

Submit Document Feedback

3

Product Folder Links: BQ27Z561-R2