BQ27Z561-R2 Impedance Track™ Battery Gas Gauge Solution

for 1-Series Cell Li-Ion Battery Packs

1 Features

• Supports high-side and low-side current sense

resistors down to 1 mΩ

• Supports pack-side gauging including enhanced

state of health (SOH) algorithm

• Fast QMax update option based on predicted OCV

• SHA-256 authentication responder for increased

battery pack security

• Sophisticated charge algorithms

– JEITA

– Enhanced charging

– RSOC() charging compensation option

• Two independent ADCs

– Support for simultaneous current and voltage

sampling

– High-accuracy coulomb counter with input

offset error < 1 µV (typical)

• Low-voltage (2-V) operation

• Wide-range current applications (1 mA to > 5 A)

• Active high or low pulse or level interrupt pin

• Supports battery trip point (BTP)

• Reduced power modes (typical battery pack

operating range conditions)

– Typical SLEEP mode: < 11 μA

– Typical DEEP SLEEP mode: < 9 μA

– Typical HIBERNATE mode: < 3 μA

– Typical OFF mode: < 1.9 μA

• Internal and external temperature sense functions

• Diagnostic lifetime data monitor and black box

recorder

• 400-kHz I2C bus communications interface for

high-speed programming and data access

• HDQ one-wire for communication with host

• Compact 12-pin DSBGA package (YPH)

2 Applications

• Smartphones

• Digital still cameras and video cameras

• Tablet computing

• Portable and wearable health devices

• Portable audio devices

3 Description

The Texas Instruments BQ27Z561-R2 Impedance

Track™ gas gauge solution is a highly integrated,

accurate 1-series cell gas gauge with a flash

programmable custom reduced instruction-set CPU

(RISC) and SHA-256 authentication for Li-ion and

Li-polymer battery packs. The 1-series cell capability

includes parallel cells for increased capacity.

The BQ27Z561-R2 gas gauge communicates through

I2C-compatible and HDQ one-wire interfaces and

includes several key features that can help facilitate

accurate

gas

gauging

applications.

Integrated

temperature sense functions (internal and external

options) enable system and battery temperature

measurements.

Device Information

PART NUMBER(1)

PACKAGE

BODY SIZE (NOM)

BQ27Z561

DSBGA (12)

1.67 mm × 2.05 mm

BQ27Z561-R2

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

PULS

INT

Li-Ion

Cell

SRP

SRN

R3

1m ±

10m

VSS

TS

RT1

103AT

BAT

BAT_SNS

SCL

SDA/HDQ

R1

10

R2

1 K

C2

0.1 F

C1

1.0 uF

CELLP

CELLN

C3

0.1 F

SCL

SDA

INT

PACKN

PACKP

PACKN

C5

0.1 F

C4

0.1 F

1 = Recommended for IEC ESD

PULS

R8

100

R9

100

1

1

1

1

CE

CE

R2

1 K

2

2 = Optional alternate connection

Highside Protection

GND

Lowside Protection

Simplified Schematic

BQ27Z561-R2

SLUSE22B – FEBRUARY 2020 – REVISED NOVEMBER 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.