bq27742-G1 Gauge Datasheet

bq27742-G1 Datasheet, PDF, Equivalent


Part Number

bq27742-G1

Description

Single-Cell Li-Ion Battery Fuel Gauge

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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bq27742-G1
SLUSBV9D – MARCH 2014 – REVISED JANUARY 2018
bq27742-G1 Single-Cell Li-Ion Battery Fuel Gauge
with Programmable Hardware Protection
1 Features
1 Battery Fuel Gauge and Protector for Single-Cell
Li-Ion Applications
• Microcontroller Peripheral Provides:
– Precision 16-Bit, High-Side Coulomb Counter
with Low-Value Sense Resistor
(5 mto 20 m)
– External and Internal Temperature Sensors for
Battery Temperature Reporting
– Lifetime and Current Data Logging
– 64 Bytes of Non-Volatile Scratch Pad Flash
– SHA-1 Authentication Capability
• Battery Fuel Gauging Based on Patented
Impedance Track™ Technology
– Models Battery Discharge Curve for Accurate
Time-To-Empty Predictions
– Automatically Adjusts for Aging, Self-
Discharge, and Temperature- and Rate-
Induced Effects on Battery
• Integrated High-side NMOS Protection FET Drive
• Hardware-based Safety and Protection:
– Overvoltage (OVP)
– Undervoltage (UVP)
– Overcurrent in Charge (OCC)
– Overcurrent in Discharge (OCD)
– Short-Circuit in Discharge (SCD)
• I2C and HDQ Interface Formats for
Communication with Host System
• Ultra-Compact, 15-Ball NanoFree™ DSBGA
2 Applications
• Smartphones
• Tablets
• Handheld Terminals
• MP3 and Multimedia Players
• Portable Gaming
3 Description
The Texas Instruments bq27742-G1 is a fuel gauge
for single-cell Li-Ion battery packs that uses patented
Impedance Track™ technology to deliver rate-,
temperature-, and aging-compensated predictions of
remaining battery capacity and system runtime with
highest accuracy. The device also includes a fully
integrated high-side protector that eliminates the
need for a separate Li-Ion protection circuit and
provides a full suite of high-accuracy fault detections
for overvoltage, undervoltage, overcurrent in charge,
overcurrent in discharge, and short-circuit in
discharge conditions. The hardware protection
functions offer built-in data flash-based
programmability, allowing simple reconfiguration of
existing devices for varying end equipment needs.
The fuel gauge provides information such as
remaining battery capacity (mAh), state-of-charge
(%), runtime to empty (minutes), voltage (mV),
current (mA), and temperature (°C), as well as
recording vital parameters throughout the lifetime of
the battery. The device also supports interrupts to the
host to indicate detection of a variety of important
battery conditions to the system.
The DSBGA is a 15-ball package (2.78 mm ×
1.96 mm) that is ideal for space-constrained
applications.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
BQ27742YZFR-G1
YZF (15)
BQ27742YZFT-G1
2.78 mm × 1.96 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VBAT
RVPWR
RBAT
CREG25
R THERM
CTHERM
Simplified Schematic
R SENSE
VPACK
CBAT
C VPWR
VPWR
SRN
BAT SRP
REG25 PACKP
TS CHG
NC DSG
RC2
SDA
VSS
SCL
HDQ
RSRN
RSRP
C SRN CSRP
CDIFF
RCHG
RDSG
R PACKP
SDA
SCL
CPACKP
Copyright © 2017, Texas Instruments Incorporated
1
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.

bq27742-G1
bq27742-G1
SLUSBV9D – MARCH 2014 – REVISED JANUARY 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 6
6.1 Absolute Maximum Ratings ...................................... 6
6.2 ESD Ratings.............................................................. 6
6.3 Recommended Operating Conditions....................... 6
6.4 Thermal Information .................................................. 7
6.5 Power-On Reset........................................................ 7
6.6 2.5-V LDO Regulator ............................................... 7
6.7 Charger Attachment and Removal Detection ........... 8
6.8 CHG and DSG FET Drive ......................................... 8
6.9 Overvoltage Protection (OVP) .................................. 8
6.10 Undervoltage Protection (UVP)............................... 8
6.11 Overcurrent in Discharge (OCD)............................. 9
6.12 Overcurrent in Charge (OCC) ................................. 9
6.13 Short-Circuit in Discharge (SCD) ............................ 9
6.14 Low Voltage Charging............................................. 9
6.15 Internal Temperature Sensor Characteristics ......... 9
6.16 High-Frequency Oscillator..................................... 10
6.17 Low-Frequency Oscillator ..................................... 10
6.18 Integrating ADC (Coulomb Counter)
Characteristics ......................................................... 10
6.19 ADC (Temperature and Cell Voltage)
Characteristics ......................................................... 10
6.20 Data Flash Memory Characteristics...................... 11
6.21 Timing Requirements ............................................ 11
6.22 Typical Characteristics .......................................... 13
7 Detailed Description ............................................ 15
7.1 Overview ................................................................. 15
7.2 Functional Block Diagram ....................................... 15
7.3 Feature Description................................................. 16
7.4 Device Functional Modes........................................ 18
7.5 Battery Parameter Measurements .......................... 21
7.6 Communications ..................................................... 22
7.7 Standard Data Commands ..................................... 24
7.8 Extended Data Commands ..................................... 26
8 Application and Implementation ........................ 27
8.1 Application Information............................................ 27
8.2 Typical Applications ................................................ 27
9 Power Supply Recommendation ........................ 35
9.1 Power Supply Decoupling ....................................... 35
10 Layout................................................................... 36
10.1 Layout Guidelines ................................................. 36
10.2 Layout Example .................................................... 37
11 Device and Documentation Support ................. 38
11.1 Documentation Support ........................................ 38
11.2 Receive Notification of Documentation Updates... 38
11.3 Community Resources.......................................... 38
11.4 Trademarks ........................................................... 38
11.5 Electrostatic Discharge Caution ............................ 38
11.6 Glossary ................................................................ 38
12 Mechanical, Packaging, and Orderable
Information ........................................................... 38
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (February 2016) to Revision D
Page
• Changed Detailed Description ............................................................................................................................................. 15
• Changed Standard Commands ........................................................................................................................................... 25
• Added Receive Notification of Documentation Updates ...................................................................................................... 38
Changes from Revision B (August 2015) to Revision C
Page
• Changed occurrences of the package label "CSP" to "DSBGA" ........................................................................................... 1
• Changed Integrating ADC (Coulomb Counter) Characteristics ........................................................................................... 10
Changes from Revision A (December 2014) to Revision B
Page
• Changed Pin Functions ......................................................................................................................................................... 3
• Changed Absolute Maximum Ratings ................................................................................................................................... 6
• Changed Recommended Operating Conditions..................................................................................................................... 7
• Changed Functional Block Diagram .................................................................................................................................... 15
• Changed VVPWR to VBAT in Figure 15 .................................................................................................................................... 19
• Changed "VPWR" to "VBAT" in OVERVOLTAGE Mode and UNDERVOLTAGE Mode........................................................... 20
2 Submit Documentation Feedback
Product Folder Links: bq27742-G1
Copyright © 2014–2018, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity bq27742-G1 SLUSBV9D – MARCH 2 014 – REVISED JANUARY 2018 bq27742-G1 Single-Cell Li-Ion Battery Fuel Gauge with Programmable Hardware Protection 1 Features •1 Battery Fuel Gauge and Protector for Single-Cell Li-Ion Applic ations • Microcontroller Peripheral P rovides: – Precision 16-Bit, High-Sid e Coulomb Counter with Low-Value Sense Resistor (5 mΩ to 20 mΩ) – Extern al and Internal Temperature Sensors for Battery Temperature Reporting – Life time and Current Data Logging – 64 By tes of Non-Volatile Scratch Pad Flash SHA-1 Authentication Capability • Battery Fuel Gauging Based on Patented Impedance Track™ Technology – Model s Battery Discharge Curve for Accurate Time-To-Empty Predictions – Automatic ally Adjusts for Aging, SelfDischarge, and Temperature- and RateInduced Effect s on Battery • Integrated High-side N MOS Protection FET Drive • Hardware-based Safety and Protection: – Overvoltage (OVP) – Undervol.
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