5 Description (cont.)

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

Pin Functions

NUMBER

NAME

I/O

DESCRIPTION

D2

BAT

P(1)

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.

D3

CE

I

Active high chip enable

C2

BAT_SNS

AI

Battery sense

A1

INT

O

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

A2

PULS

O

Programmable pulse width with active high or low option

B1

TS

AI

Temperature input for ADC

C3

NU

NU

Makes no external connection

B3

SCL

I/O

unused.

A3

SDA/HDQ

I/O

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

D1

SRP

I

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

voltage between SRP (positive side) and SRN

C1

SRN

I

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

voltage between SRP (positive side) and SRN

B2

VSS

P

Device ground

(1)

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

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BQ27Z561-R2

SLUSE22 – SEPTEMBER 2020

Copyright © 2020 Texas Instruments Incorporated

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