BAT

VC5

VC4

VC3

VC2

VC1

VSS

SCL

SDA

CHG

DSG

REGSRC

REGOUT

SRN

SRP

VC0

CAP 1

TS 1

ALERT

PUSH-BUTTON

FOR BOOT

PACK+

PACK–

VCC

ALERT

SDA

SCL

VSS

SMBD

SMBC

SMBD

SMBC

bq76920

PRES

LED1

LED2

LED3

LED4

LED5

KEYIN

BAT

VEN

COM

PWRM

GPIOA

SAFE

VAUX

SMBA

GPIOB

ADREN

RBI

PRECHG

MRST

DISP

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

bq78350-R1

SLUSCD0B – AUGUST 2015 – REVISED NOVEMBER 2018

bq78350-R1 CEDV Li-Ion Gas Gauge and Battery Management Controller Companion to

the bq769x0 Battery Monitoring AFE

1

1 Features

1

•

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

2 Applications

•

Light Electric Vehicles (LEVs): eBikes, eScooters,

Pedelec, and Pedal-Assist Bicycles

•

Power and Gardening Tools

•

Battery Backup and Uninterruptible Power Supply

(UPS) Systems

•

Wireless Base Station Backup Systems

•

Telecom Power Systems

•

Handheld Vacuum Cleaners and Robot Vacuums

3 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.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

bq78350-R1

TSSOP (30)

7.80 mm x 6.40 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Simplified Schematic