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,

including a 1.2-V logic level 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 BQ27Z558 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 BQ27Z558 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.