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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.