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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

Product

Folder

Order

Now

Technical

Documents

Tools &

Software

Support &

Community

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 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 LiFePO

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

LiFePO

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

bq78350-R1

SLUSCD0B –AUGUST 2015–REVISED NOVEMBER 2018

www.ti.com

Product Folder Links: bq78350-R1

Table of Contents

1 Features.................................................................. 1

2 Applications ........................................................... 1

3 Description ............................................................. 1

4 Revision History..................................................... 2

5 Description (continued)......................................... 2

6 Pin Configuration and Functions......................... 3

7 Specifications......................................................... 4

7.1 Absolute Maximum Ratings ...................................... 4

7.2 ESD Ratings.............................................................. 4

7.3 Recommended Operating Conditions....................... 4

7.4 Thermal Information.................................................. 5

7.5 Electrical Characteristics: Supply Current................. 5

7.6 Electrical Characteristics: I/O.................................... 5

7.7 Electrical Characteristics: ADC ................................. 5

7.8 Electrical Characteristics: Power-On Reset.............. 6

7.9 Electrical Characteristics: Oscillator.......................... 6

7.10 Electrical Characteristics: Data Flash Memory ....... 6

7.11 Electrical Characteristics: Register Backup ............ 7

7.12 SMBus Timing Specifications ................................. 7

7.13 Typical Characteristics ........................................... 8

8 Detailed Description.............................................. 9

8.1 Overview ................................................................... 9

8.2 Functional Block Diagram ....................................... 10

8.3 Feature Description................................................. 10

8.4 Device Functional Modes........................................ 12

8.5 Programming........................................................... 12

9 Application and Implementation ........................ 13

9.1 Application Information............................................ 13

9.2 Typical Applications ................................................ 13

10 Power Supply Recommendations ..................... 21

11 Layout................................................................... 21

11.1 Layout Guidelines ................................................. 21

11.2 Layout Example .................................................... 22

12 Device and Documentation Support ................. 23

12.1 Related Documentation......................................... 23

12.2 Community Resources.......................................... 23

12.3 Trademarks........................................................... 23

12.4 Electrostatic Discharge Caution............................ 23

12.5 Glossary................................................................ 23

13 Mechanical, Packaging, and Orderable

Information ........................................................... 23

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision A (October 2017) to Revision B Page

• Changed Gas Gauging......................................................................................................................................................... 18

• Changed Power Supply Recommendations......................................................................................................................... 21

Changes from Original (August 2015) to Revision A Page

• Changed Applications ............................................................................................................................................................ 1

5 Description (continued)

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.

bq78350-R1

www.ti.com

SLUSCD0B –AUGUST 2015–REVISED NOVEMBER 2018

Product Folder Links: bq78350-R1

(1) I = Input, IA = Analog input, I/O = Input/output, I/OD = Input/Open-drain output, O = Output, OA = Analog output, P = Power

6 Pin Configuration and Functions

30-Pin DBT Package

Pin Functions

NUMBER

PIN NAME TYPE DESCRIPTION

1 COM O

(1)

Open-drain output LCD common connection. Leave unconnected if not used.

2 ALERT I Input from the bq769x0 AFE

3 SDA I/O Data transfer to and from the bq769x0 AFE. Requires a 10-k pullup to VCC

4 SCL I/O Communication clock to the bq769x0 AFE. Requires a 10-k pullup to VCC

5 PRECHG O

Programmable polarity (default is active low) output to enable an optional precharge FET. This pin

requires an external pullup to 2.5 V when configured as active high, and is open drain when

configured as active low.

6 VAUX AI Auxiliary voltage input. If this pin is not used, then it should be tied to VSS.

7 BAT AI Translated battery voltage input

8 PRES I

Active low input to sense system insertion. This typically requires additional ESD protection. If this

pin is not used, then it should be tied to VSS.

9 KEYIN I

A low level indicates application key-switch is inactive on position. A high level causes the DSG

protection FET to open. If this pin is not used, then it should be tied to VSS.

10 SAFE O Active high output to enforce an additional level of safety protection (for example, fuse blow)

11 SMBD I/OD

SMBus data open-drain bidirectional pin used to transfer an address and data to and from the

bq78350-R1 device

12 VEN O

Active high voltage translation enable. This open drain signal is used to switch the input voltage

divider on/off to reduce the power consumption of the BAT translation divider network.

13 SMBC I/OD

SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the bq78350-

R1 device

14 DISP I

Display control for the LEDs. This pin is typically connected to bq78350-R1 device REGOUT via a

100-KΩ resistor and a push-button switch connect to VSS. Not used with LCD display enabled and

can be tied to VSS.

15 PWRM O Power mode state indicator open drain output

16 LED1 O

LED1/LCD1 display segment that drives an external LED/LCD, depending on the firmware

configuration

17 LED2 O

LED2/LCD2 display segment that drives an external LED/LCD, depending on the firmware

configuration

18 LED3 O

LED3/LCD3 display segment that drives an external LED/LCD, depending on the firmware

configuration

19 LED4 O

LED4/LCD4 display segment that drives an external LED/LCD, depending on the firmware

configuration

bq78350-R1

SLUSCD0B –AUGUST 2015–REVISED NOVEMBER 2018

www.ti.com

Product Folder Links: bq78350-R1

Pin Functions (continued)

NUMBER

PIN NAME TYPE DESCRIPTION

20 LED5 O

LED5/LCD5 display segment that drives an external LED/LCD, depending on the firmware

configuration

21 GPIO A I/O Configurable Input or Output. If not used, tie to VSS.

22 VSS — Negative supply voltage

23 VSS — Negative supply voltage

24 MRST I

Master reset input that forces the device into reset when held low. This pin must be held high for

normal operation.

25 VSS — Negative supply voltage

26 VCC P Positive supply voltage

27 RBI P

RAM backup input. Connect a capacitor to this pin and VSS to protect loss of RAM data in case of

short circuit condition.

28 GPIO B I/O Configurable input or output. If not used, tie to VSS.

29 ADREN O Optional digital signal enables address detection measurement to reduce power consumption.

30 SMBA IA Optional SMBus address detection input. If this pin is not used, then it should be tied to VSS.

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating

conditions is not implied. Exposure to absolute–maximum–rated conditions for extended periods may affect device reliability.

7 Specifications

7.1 Absolute Maximum Ratings

Over operating free-air temperature range (unless otherwise noted)

(1)

MIN MAX UNIT

relative to V

Supply voltage range –0.3 2.75 V

(IOD)

relative to V

Open-drain I/O pins –0.3 6 V

relative to V

Input voltage range to all other pins –0.3 VCC + 0.3 V

Operating free-air temperature range, T

–40 85 °C

Storage temperature range, T

stg

–65 150 °C

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.2 ESD Ratings

VALUE UNIT

(ESD)

Human Body Model (HBM) ESD stress voltage

(1)

±2000

Charged Device Model (CDM) ESD stress voltage

(2)

±500

7.3 Recommended Operating Conditions

= 2.4 V to 2.6 V, T

= –40°C to 85°C (unless otherwise noted)

MIN NOM MAX UNIT

Supply voltage 2.4 2.5 2.6 V

Output voltage range

SAFE V

SMBC, SMBD, VEN 5.5 V

ADREN, GPIO A, GPIO B, SDATA, SCLK,

PWRM, LED1...5 (when used as GPO)

Input voltage range

BAT, VAUX, SMBA 1

SMBD, SMBC, ALERT, DISP, PRES, KEYIN 5.5

SDATA, GPIO A, GPIO B, LED1...5 (when

used as GPI)

OPR

Operating Temperature –40 85 °C

bq78350-R1

www.ti.com

SLUSCD0B –AUGUST 2015–REVISED NOVEMBER 2018

Product Folder Links: bq78350-R1

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report, SPRA953.

7.4 Thermal Information

THERMAL METRIC

(1)

bq78350-R1

UNITTSSOP (DBT)

30 PINS

θJA, High K

Junction-to-ambient thermal resistance 81.4

°C/W

θJC(top)

Junction-to-case(top) thermal resistance 16.2

θJB

Junction-to-board thermal resistance 34.1

Junction-to-top characterization parameter 0.4

Junction-to-board characterization parameter 33.6

θJC(bottom)

Junction-to-case(bottom) thermal resistance n/a

(1) The actual current consumption of this mode fluctuates during operation over a 1-s period. The value shown is an average using the

default data flash configuration.

(2) The actual current consumption of this mode fluctuates during operation over a user-configurable period. The value shown is an average

using the default data flash configuration.

7.5 Electrical Characteristics: Supply Current

= 2.4 V to 2.6 V, T

= –40°C to 85°C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Operating mode current No flash programming 650

(1)

μA

(SLEEP)

Low-power storage mode current SLEEP mode 300

(2)

μA

(SHUTDOWN)

Low-power SHUTDOWN mode current SHUTDOWN mode 0.1 1 μA

7.6 Electrical Characteristics: I/O

= 2.4 V to 2.6 V, T

= –40°C to 85°C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Output voltage low SMBC, SMBD,

SDATA, SCLK, SAFE, ADREN, VEN,

GPIO A, GPIO B, PWRM

= 0.5 mA 0.4 V

Output voltage low LED1, LED2, LED3,

LED4, LED5

= 3 mA 0.4

Output voltage high SMBC, SMBD,

SDATA, SCLK, SAFE, ADREN, VEN,

GPIO A, GPIO B, PWRM

= –1 mA V

– 0.5 V

Input voltage low SMBC, SMBD, SDATA,

SCLK, ALERT, DISP, SMBA, GPIO A,

GPIO B, PRES, KEYIN

–0.3 0.8 V

Input voltage high SMBC, SMBD,

SDATA, SCLK, ALERT, SMBA, GPIO A,

GPIO B

2 6 V

Input voltage high DISP, PRES, KEYIN 2 V

+ 0.3 V

Input capacitance 5 pF

LKG

Input leakage current 1 µA

7.7 Electrical Characteristics: ADC

= 2.4 V to 2.6 V, T

= –40°C to 85°C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Input voltage range BAT, VAUX –0.2 1 V

Conversion time 16 ms

Resolution (no missing codes) 16 bits

Effective resolution 13 14 bits

剩余28页未读，继续阅读

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