BQ27Z561 firmware: impedance track battery gas gauge solution for 1-s cell li-ion battery




The BQ27Z561-R2-DEVICE-FW is a firmware (FW) release that can be flashed onto any existing hardware such as the BQ27Z561 or BQ27Z561-R1 product. The firmware incorporates the patented Impedance Track™ technology to create a pack-based solution that provides a rich array of features for gas gauging, protection, and authentication for 1-series cell li-ion and li-polymer battery packs.

Using its integrated high-performance analog peripherals, the BQ27Z561-R2-DEVICE-FW firmware enables the device and measures and maintains an accurate record of available capacity, voltage, current, temperature, and other critical parameters in li-ion or li-polymer batteries, and reports this information to the system host controller.

SHA-2 authentication, with secure memory for authentication keys, enables identification of genuine battery packs.

  • 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
  • Added hibernate mode to enable < 3uA power mode


Application software & framework

BQ27Z561-R2-DEVICE-FW BQ27Z561 device firmware: impedance track battery gas gauge solution for 1-s cell li-ion battery packs

Supported products & hardware

Supported products & hardware

Battery fuel gauges
BQ27Z561 Impedance Track™ integrated circuit gas gauge solution for 1-series BQ27Z561-R1 Impedance Track™ battery gas gauge solution for 1-series cell Li-ion battery packs BQ27Z561-R2 Impedance track battery gas gauge solution for 1-series cell li-ion battery packs

Technical documentation

= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 2
Type Title Date
* User guide BQ27Z561-R2 Technical Reference Manual (Rev. B) 07 May 2020
Application note BQ27Z561-R1 to BQ27Z561-R2 Change List 26 Feb 2020

Related design resources

Software development

BQPRODUCTION-SINGLECELL Production Software for Single Cell Battery Fuel (Gas) Gauges

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support.