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BQ78350-R1

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CEDV li-ion gas gauge and battery management controller

Data sheet
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CEDV li-ion gas gauge and battery management controller

BQ78350-R1

ACTIVE
Data sheet Order now

Product details

Parameters

Cell chemistry Li-Ion/Li-Polymer, LiFePO4 Number of series cells >4 Cells Communication interface I2C, SMBus Battery capacity (Min) (mAh) 100 Battery capacity (Max) (mAh) 320000 Implementation Pack External capacity indication LCD, LED, SOC Features CEDV algorithm Operating temperature range (C) -40 to 85 Cell balancing External, Internal open-in-new Find other Battery fuel gauges

Package | Pins | Size

TSSOP (DBT) 30 34 mm² 7.8 x 4.4 open-in-new Find other Battery fuel gauges

Features

  • 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

All trademarks are the property of their respective owners.

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Description

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
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Drop-in replacement with upgraded functionality to the compared device.
BQ78350-R1A ACTIVE CEDV li-ion gas gauge and battery management controller functionally identical to R1. Pre-loaded with latest R1 firmware (v1.04). Improves the robustness of the Shutdown routine (fif using the Shutdown command in th

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) Nov. 06, 2018
* User guide BQ78350-R1 Technical Reference Manual (Rev. E) Jan. 09, 2020
Technical article Protector, monitor or gauge – selecting the correct battery electronics for your Li-ion-powered system Jun. 13, 2019
User guide bq76930 and bq76940 Evaluation Module (Rev. C) Dec. 10, 2018
User guide bq76920 Evaluation Module User's Guide (Rev. D) Nov. 12, 2018
Application note Using the bq78350-R1 Nov. 05, 2018
Application note Achieving The Successful Learning Cycle Jun. 19, 2018
User guide Simple Guide to CEDV Data Collection for Gauging Parameter Calculator (GPC) (Rev. B) Jan. 30, 2018
Application note Gauge Communication Jan. 12, 2017
Technical article How to choose a multicell gauge Dec. 16, 2016
Application note SMBus Made Simple Nov. 09, 2016
Technical article How active and passive cell balancing works Oct. 05, 2016
Technical article Big batteries? Take a walk on the (high) side Feb. 01, 2016
Application note bq78350 Data Memory Programming for Mass Production Apr. 16, 2015

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
149
Description

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 (...)

Features
  • Populated circuit board with:
  • Bq7692000 AFE IC
  • Bq78350 Battery Management controller
  • FETs for current control
  • Test point patterns for easy evaluation
View details
EVALUATION BOARD Download
document-generic User guide
249
Description

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 (...)

Features
  • Bq7693000 AFE IC
  • Bq78350 Battery Management controller
  • FETs for current control
  • Test point patterns for easy evaluation
View details
EVALUATION BOARD Download
document-generic User guide
249
Description

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 (...)

Features
  • Bq7694000 AFE IC
  • Bq78350 Battery Management controller
  • FETs for current control
  • Test point patterns for easy evaluation
View details

Software development

APPLICATION SOFTWARE & FRAMEWORK Download
Battery Management Studio (bqStudio) Software
BQSTUDIO — 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 (...)
Features
  • Real-time Gauge Dashboard for monitoring basic registers
  • Full register access and logging
  • Full data memory access and logging
  • Product configuration and monitoring tools
  • Import and export of product configurations
  • Calibration and test automation
  • Export of FS files for the target production environment 
View details
APPLICATION SOFTWARE & FRAMEWORK Download
Gauging Parameter Calculator for CEDV gauges
GPCCEDV — Gauging Parameter Calculator (GPC) is a math calculation and simulation tool that helps the battery designer to obtain matching Compensated End of Discharge Voltage (CEDV) coefficients for the specific battery profile. The tool allows the user to increase the accuracy of the fuel gauge IC over (...)
FIRMWARE Download
BQ78350-R2 Device Firmware: CEDV Li-Ion Gas Gauge and Battery Management Controller
BQ78350-R2-DEVICE-FW — The bq78350-R2 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.
Features
  • 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 320Ahr
  • Supports charge and (...)
View details
FIRMWARE Download
SLUC594A.ZIP (4249 KB)
SUPPORT SOFTWARE Download
SLUC564FW.ZIP (2777 KB)
SUPPORT SOFTWARE Download
SLUC568.ZIP (148 KB)

Design tools & simulation

CALCULATION TOOL Download
document-generic User guide

Reference designs

REFERENCE DESIGNS Download
Multi-Cell 36-48V Battery Management System Reference Design
TIDA-00792 — The TIDA-00792 TI Design provides monitoring, balancing, primary protection and gauging for a 12 to 15 cell lithium-ion or lithium-iron phosphate based batteries. This board is intended to be mounted in an enclosure for industrial systems. The reference design subsystem provides battery protection (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
15 Cell Lithium Ion Battery Controller Analog Front End Reference Design
TIDA-00255 — The TIDA00255 reference design utilizes the bq76940 analog front end (AFE) IC.  It measures cell voltages, and die temperature or external thermistor voltage using a 14 bit ADC.  Current is measured separately by a separate 16 bit coulomb counter.  The design can turn off low side (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
TSSOP (DBT) 30 View options

Ordering & quality

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  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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