Compensated End-of-Discharge Voltage (CEDV) Gauging Algorithm
Supports SMBus Host Communication
Flexible Configuration for 3- to 5-Series (bq76920), 6- to 10-Series (bq76930), and 9- to 15-Series (bq76940) Li-Ion and LiFePO₄ Batteries
Supports Battery Configurations up to 320 Ahr
Supports Charge and Discharge Current Reporting up to 320 A
On-Chip Temperature Sensor Option
External NTC Thermistor Support from Companion AFE
Full Array of Programmable Protection Features
- Voltage, Current, and Temperature
- System Components
Lifetime Data Logging
Supports CC-CV Charging, Including Precharge, Charge Inhibit, and Charge Suspend
Offers an Optional Resistor Programmable SMBus Slave Address for up to Eight Different Bus Addresses
Drives up to a 5-Segment LED or LCD Display for State-Of-Charge Indication
Provides SHA-1 Authentication

Compensated End-of-Discharge Voltage (CEDV) Gauging Algorithm
Supports SMBus Host Communication
Flexible Configuration for 3- to 5-Series (bq76920), 6- to 10-Series (bq76930), and 9- to 15-Series (bq76940) Li-Ion and LiFePO₄ Batteries
Supports Battery Configurations up to 320 Ahr
Supports Charge and Discharge Current Reporting up to 320 A
On-Chip Temperature Sensor Option
External NTC Thermistor Support from Companion AFE
Full Array of Programmable Protection Features
- Voltage, Current, and Temperature
- System Components
Lifetime Data Logging
Supports CC-CV Charging, Including Precharge, Charge Inhibit, and Charge Suspend
Offers an Optional Resistor Programmable SMBus Slave Address for up to Eight Different Bus Addresses
Drives up to a 5-Segment LED or LCD Display for State-Of-Charge Indication
Provides SHA-1 Authentication

The Texas Instruments bq78350-R1 Li-Ion and LiFePO₄ Battery Management Controller and companion to the bq769x0 family of Analog Front End (AFE) protection devices provides a comprehensive set of Battery Management System (BMS) subsystems, helping to accelerate product development for faster time-to-market.

The bq78350-R1 controller and the bq769x0 AFE support 3-series to 15-series cell applications. The bq78350-R1 device provides an accurate fuel gauge and state-of-health (SoH) monitor, as well as cell balancing and a full range of voltage-, current-, and temperature-based protection features.

The bq78350-R1 device offers optional LED or LCD display configurations for capacity reporting. It also makes data available over its SMBus 1.1 interface. Battery history and diagnostic data is also kept within the device in non-volatile memory and is available over the same interface.

The Texas Instruments bq78350-R1 Li-Ion and LiFePO₄ Battery Management Controller and companion to the bq769x0 family of Analog Front End (AFE) protection devices provides a comprehensive set of Battery Management System (BMS) subsystems, helping to accelerate product development for faster time-to-market.

The bq78350-R1 controller and the bq769x0 AFE support 3-series to 15-series cell applications. The bq78350-R1 device provides an accurate fuel gauge and state-of-health (SoH) monitor, as well as cell balancing and a full range of voltage-, current-, and temperature-based protection features.

The bq78350-R1 device offers optional LED or LCD display configurations for capacity reporting. It also makes data available over its SMBus 1.1 interface. Battery history and diagnostic data is also kept within the device in non-volatile memory and is available over the same interface.

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More information

Device firmware is available (BQ78350-R2-DEVICE-FW). Request now

Technical documentation

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	Type	Title		Date
*	Data sheet	bq78350-R1 CEDV Li-Ion Gas Gauge and Battery Management Controller Companion to the bq769x0 Battery Monitoring AFE datasheet (Rev. B)	PDF \| HTML	06 Nov 2018
*	User guide	BQ78350-R1 Technical Reference Manual (Rev. E)		09 Jan 2020
	User guide	BQ78350-R1 TRM Addendum for BQ78350-R3	PDF \| HTML	22 Feb 2022
	Technical article	Protector, monitor or gauge – selecting the correct battery electronics for your Li-ion-powered system		13 Jun 2019
	User guide	bq76930 and bq76940 Evaluation Module (Rev. C)		10 Dec 2018
	EVM User's guide	bq76920 Evaluation Module User's Guide (Rev. D)		12 Nov 2018
	Application note	Using the bq78350-R1		05 Nov 2018
	User guide	Simple Guide to CEDV Data Collection for Gauging Parameter Calculator (GPC) (Rev. B)		30 Jan 2018
	Application note	Gauge Communication		12 Jan 2017
	Technical article	How to choose a multicell gauge		16 Dec 2016
	Application note	SMBus Made Simple	PDF \| HTML	09 Nov 2016
	Technical article	How active and passive cell balancing works		05 Oct 2016
	Technical article	Big batteries? Take a walk on the (high) side		01 Feb 2016
	Application note	bq78350 Data Memory Programming for Mass Production		16 Apr 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

BQ76920EVM — BQ76920 evaluation board with BQ78350

The bq76920EVM is a populated circuit board for evaluation of the bq7692000 analog front-end (AFE) along with the bq78350 Battery Management Controller that serves as part of a complete pack monitoring and protection solution for 3 to 5-series Lithium Ion, Lithium iron phosphate, and more battery (...)

User guide: PDF

Not available on TI.com

Evaluation board

BQ76930EVM — BQ76930 evaluation board with BQ78350

The bq76930EVM is a populated circuit board for evaluation of the bq76930 analog front-end (AFE) along with the bq78350 Battery Management Controller that serves as part of a complete pack monitoring and protection solution for 6 to 10-series Lithium Ion, Lithium iron phosphate, and more battery (...)

User guide: PDF

Not available on TI.com

Evaluation board

BQ76940EVM — BQ76940 evaluation board with BQ78350

The bq76940EVM is a populated circuit board for evaluation of the bq76940 analog front-end (AFE) along with the bq78350 Battery Management Controller that serves as part of a complete pack monitoring and protection solution for 9 to 15-series Lithium Ion, Lithium iron phosphate, and more battery (...)

User guide: PDF

Not available on TI.com

Application software & framework

BQSTUDIO-TEST — Battery Management Studio (bqStudio) Software – Beta version downloads

Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)

Supported products & hardware

Products

Battery monitors & balancers

BQ769142 — 3-s to 14-s high-accuracy battery monitor and protector for Li-ion, Li-polymer and LiFePO4 battery

BQ76942 — 3-series to 10-series multicell battery monitor and protector

BQ76952 — 3-s to 16-s high-accuracy battery monitor and protector for Li-ion, Li-polymer and LiFePO4

Battery charger ICs

BQ24800 — SMBus 1-4 cell Buck battery charge controller to support hybrid power boost and battery boost mode

BQ25720 — SMBus 1- to 4-cell NVDC buck-boost battery charge controller with power path and USB-C® PD OTG

BQ25723 — I²C 1-4 cell NVDC buck-boost battery charge controller with power path and USB-C® PD OTG

BQ25731 — I2C 1-5 cell NVDC buck-boost battery charge controller with USB type-C PD support

BQ25790 — Integrated, NVDC, 5-A 1-cell to 4-cell switch-mode buck-boost battery charger

BQ25792 — I2C controlled, 5-A, 1-4 cell buck-boost charger with dual-input selector and USB PD 3.0 OTG output

Battery fuel gauges

BQ27220 — Single cell pack/system-side CEDV battery fuel (gas) gauge w/pre-programmed chemistry profiles

BQ27320 — Single cell pack/System-side CEDV battery fuel (gas) gauge

BQ27425-G1 — System-side Impedance Track™; fuel gauge with direct battery connection | gas gauge battery

BQ27425-G2A — System-side Impedance Track™; fuel gauge for LiCoO2 battery

BQ27425-G2B — System-side Impedance Track™; fuel gauge LiMn2O4 battery

BQ27510-G3 — System-side Impedance-Track fuel gauge that provides 32 bytes of user-programmable data Flash memory

BQ27520-G4 — System side Impedance Track™ fuel gauge with integrated LDO.

BQ27530-G1 — System-side Impedance-Track fuel (gas) gauge with direct battery connection

BQ27531-G1 — Battery management unit Impedance Track™ fuel (gas) gauge for bq2419x charger controller

BQ27532-G1 — Battery management unit Impedance Track™ fuel gauge for bq2425x charger

BQ27541-G1 — Pack-side Impedance Track™ battery fuel gauge with integrated LDO

BQ27541-V200 — Single cell Li-ion battery fuel gauge for battery pack Integration; FW upgrade to BQ27541

BQ27542-G1 — Single cell Impedance Track™ pack side fuel gauge with SON package

BQ27545-G1 — Single cell, pack side, Impedance Track™ fuel gauge

BQ27546-G1 — Single cell Impedance Track™ pack side fuel gauge with DSBGA package

BQ27621-G1 — System-side fuel gauge with Dynamic Voltage Correlation, battery gas gauge

BQ27741-G1 — Pack-side Impedance Track™(tm) fuel (gas) gauge with integrated protector

BQ27742-G1 — Single cell Li-ion battery fuel gauge with integrated protection | battery gas gauge

BQ27Z561 — Impedance Track™ integrated circuit gas gauge solution for 1-series

BQ27Z746 — Pack-side, single-cell Impedance Track™ technology fuel gauge with integrated protector

BQ28Z610 — Battery fuel gauge with integrated protector for 1-2 series packs

BQ34110 — Multi-chemistry high-cell Count battery fuel gauge with integrated rarely discharged module

BQ34210-Q1 — Automotive Qualified Single cell system-side CEDV fuel gauge

BQ34Z100-G1 — Multi-chemistry Impedance Track™ standalone fuel gauge | battery gas gauge

BQ35100 — Battery fuel gauge for non-rechargeable batteries (lithium primary) and end-of-service monitor

BQ4050 — 1-4 series CEDV battery fuel (gas) gauge

BQ40Z50 — 1-4 series Li-ion battery pack manager | battery fuel (gas) gauge

BQ40Z50-R1 — 1-4 series Li-ion battery pack manager supporting Turbo Mode 1.0

BQ40Z50-R2 — 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0

BQ40Z60 — Complete multi-cell battery manager | battery fuel (gas) gauge

BQ40Z80 — 2-s to 6-s battery pack manager with Impedance Track™ gas gauging

BQ78350 — Companion CEDV Fuel Gauge Battery Management Controller for bq76940 Monitor Family

BQ78350-R1 — CEDV li-ion gas gauge and battery management controller

BQ78Z100 — Impedance Track™ battery fuel (gas) gauge for 1-series to 2-series

Hardware development

MKST-3P-ALT-EV2300 — MKS Technology alternative for EV2300 communications transceiver

Software

BQ40Z50-R3-DEVICE-FW — BQ40Z50-R3 device firmware: 1-4 series Li-ion battery pack manager | battery fuel (gas) gauge

Download options

Application software & framework

BQSTUDIO-STABLE — Battery Management Studio (bqStudio) Software – stable version downloads for bq series of TI battery fuel gauges