Fuel Gauge. bq27742-G1 Datasheet

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bq27742-G1 Datasheet
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Part bq27742-G1
Description Single-Cell Li-Ion Battery Fuel Gauge
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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.



Texas Instruments 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



Texas Instruments bq27742-G1
www.ti.com
5 Pin Configuration and Functions
123
A
SRP
CHG
DSG
bq27742-G1
SLUSBV9D – MARCH 2014 – REVISED JANUARY 2018
B SRN NC PACKP
C
VPWR
BAT
SDA
D
VSS
HDQ
RC2
NUMBER
A1
A2
A3
B1
B2
B3
C1
C2
C3
D1
D2
D3
E1
E2
E3
NAME
SRP
CHG
DSG
SRN
NC
PACKP
VPWR
BAT
SDA
VSS
HDQ
RC2
REG25
TS
SCL
E REG25 TS
SCL
Not to scale
Pin Functions
I/O DESCRIPTION
I
Analog input pin connected to the internal coulomb counter where SRP is nearest the PACK+
connection. Connect to a sense resistor.
O External high side N-channel charge FET driver
O External high side N-channel discharge FET driver
I
Analog input pin connected to the internal coulomb counter where SRN is nearest the CELL+
connection. Connect to a sense resistor.
IO Not used. Reserved for future GPIO. It is recommended to connect to GND.
I Pack voltage measurement input for protector operation
— Power input. Decouple with 0.1-µF ceramic capacitor to VSS.
I Cell-voltage measurement input. ADC input
IO
Slave I2C serial communications data line for communication with system. Open-drain I/O.
Use with a 10-kΩ pullup resistor (typical).
— Device ground
I/O HDQ serial communications line. Open-drain
IO General purpose IO. Push-pull output
Regulator output and bq27742-G1 processor power. Decouple with 1.0-µF ceramic capacitor
to VSS.
I Pack thermistor voltage sense (use 103AT-type thermistor). ADC input
IO
Slave I2C serial communications clock input line for communication with system. Use with a
10-kΩ pullup resistor (typical).
Copyright © 2014–2018, Texas Instruments Incorporated
Product Folder Links: bq27742-G1
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