Fuel Gauge. bq27741-G1 Datasheet

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bq27741-G1 Datasheet
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Part bq27741-G1
Description Single-Cell Li-Ion Battery Fuel Gauge
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bq27741-G1
SLUSBF2C – JULY 2013 – REVISED AUGUST 2015
bq27741-G1 Single-Cell Li-Ion Battery Fuel Gauge with Integrated Protection
1 Features
1 Battery Fuel Gauge and Protector for 1-Series Li-
Ion Applications
• Microcontroller Peripheral Provides:
– Accurate Battery Fuel Gauging Supports up to
14,500 mAh
– External and Internal Temperature Sensors for
Battery Temperature Reporting
– Precision 16-Bit High-Side Coulomb Counter
with High-Side Low-Value Sense Resistor
(5 mto 20 m)
– Lifetime and Current Data Logging
– 64 Bytes of Non-Volatile Scratch Pad Flash
– SHA-1/HMAC Authentication
• 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
• Advanced Fuel Gauging Features
– Internal Short Detection
– Tab Disconnection Detection
• Safety and Protection:
– Over- and Undervoltage Protection with Low-
Power Mode
– Overcharging and Discharging Current
Protection
– Overtemperature Protection
– Short-Circuit Protection
– Low-Voltage Notification
– Voltage Doubler to Support High-Side
N-Channel FET Protection
• HDQ and I2C Interface Formats for
Communication with Host System
• Small 15-Ball NanoFree™ (BGA) Packaging
2 Applications
• Smartphones
• PDAs
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players
3 Description
The Texas Instruments bq27741-G1 Li-Ion battery
fuel gauge is a microcontroller peripheral that
provides fuel gauging for single-cell Li-Ion battery
packs. The device requires little system
microcontroller firmware development for accurate
battery fuel gauging. The fuel gauge resides within
the battery pack or on the system’s main board with
an embedded battery (non-removable). The fuel
gauge provides hardware-based over- and
undervoltage, overcurrent in charge or discharge, and
short-circuit protections.
The fuel gauge uses the patented Impedance
Track™ algorithm for fuel gauging, and provides
information such as remaining battery capacity
(mAh), state-of-charge (%), run-time to empty
(minimum), battery voltage (mV), and temperature
(°C), as well as recording vital parameters throughout
the lifetime of the battery.
The device comes in a 15-ball BGA package
(2.776 mm × 1.96 mm) that is ideal for space-
constrained applications.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq27741-G1
YZF (15)
2.78 mm × 1.96 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
PACK+
Simplified Schematic
Battery Pack
HDQ
SDA
SCL
SRP
CHG
DSG
PACKP
HDQ
SDA
SCL
SRN
VPWR
VBAT
REG25
PACK–
TS
Vss
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 bq27741-G1
bq27741-G1
SLUSBF2C – JULY 2013 – REVISED AUGUST 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
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....................... 5
7.4 Thermal Information .................................................. 5
7.5 Power-On Reset........................................................ 6
7.6 2.5-V LDO Regulator ............................................... 6
7.7 Charger Attachment and Removal Detection ........... 6
7.8 Voltage Doubler ........................................................ 6
7.9 Overvoltage Protection (OVP) .................................. 6
7.10 Undervoltage Protection (UVP)............................... 7
7.11 Overcurrent in Discharge (OCD)............................. 7
7.12 Overcurrent in Charge (OCC) ................................. 7
7.13 Short-Circuit in Discharge (SCD) ............................ 7
7.14 Low-Voltage Charging............................................. 8
7.15 Internal Temperature Sensor Characteristics ......... 8
7.16 Internal Clock Oscillators ........................................ 8
7.17 Integrating ADC (Coulomb Counter)
Characteristics ........................................................... 8
7.18 ADC (Temperature and Cell Voltage)
Characteristics ........................................................... 8
7.19 Data Flash Memory Characteristics........................ 9
7.20 I2C-Compatible Interface Timing Characteristics .... 9
7.21 HDQ Communication Timing Characteristics ......... 9
7.22 Typical Characteristics .......................................... 11
8 Detailed Description ............................................ 12
8.1 Overview ................................................................. 12
8.2 Functional Block Diagram ....................................... 12
8.3 Feature Description................................................. 13
8.4 Device Functional Modes........................................ 16
9 Application and Implementation ........................ 22
9.1 Application Information .......................................... 22
9.2 Typical Applications ................................................ 22
10 Power Supply Recommendations ..................... 29
10.1 Power Supply Decoupling ..................................... 29
11 Layout................................................................... 29
11.1 Layout Guidelines ................................................. 29
11.2 Layout Example .................................................... 31
12 Device and Documentation Support ................. 32
12.1 Device Support...................................................... 32
12.2 Documentation Support ........................................ 32
12.3 Community Resources.......................................... 32
12.4 Trademarks ........................................................... 32
12.5 Electrostatic Discharge Caution ............................ 32
12.6 Glossary ................................................................ 32
13 Mechanical, Packaging, and Orderable
Information ........................................................... 32
4 Revision History
Changes from Revision B (April 2015) to Revision C
Page
• Changed Pin Configuration and Functions ............................................................................................................................ 3
• Changed Absolute Maximum Ratings .................................................................................................................................... 4
• Changed Recommended Operating Conditions .................................................................................................................... 5
• Changed Functional Block Diagram ..................................................................................................................................... 12
• Deleted UNDERTEMPERATURE FAULT Mode ................................................................................................................. 21
• Added Community Resources.............................................................................................................................................. 32
2 Submit Documentation Feedback
Product Folder Links: bq27741-G1
Copyright © 2013–2015, Texas Instruments Incorporated



Texas Instruments bq27741-G1
www.ti.com
5 Device Comparison Table
PRODUCTION
PART NO.(1)
bq27741YZFR-G1
bq27741YZFT-G1
(1) bq27741-G1 is shipped in the I2C mode.
FIRMWARE VERSION
1.08
bq27741-G1
SLUSBF2C – JULY 2013 – REVISED AUGUST 2015
COMMUNICATION FORMAT
I2C, HDQ(1)
6 Pin Configuration and Functions
(TOP VIEW)
YZF Package
15-Pin DSBGA
(BOTTOM VIEW)
A3 B3 C3 D3 E3
E3 D3 C3 B3 A3
A2 B2 C2 D2 E2
E2 D2 C2 B2 A2
A1 B1 C1 D1 E1
E1 D1 C1 B1 A1
BOTTOM VIEW
SCL
RC2
SDA
PACKP
DSG 3
TS
HDQ
BAT
NC
CHG 2
REG25
VSS
VPWR
SRN
SRP 1
EDCB A
PIN
NAME
BAT
CHG
DSG
HDQ
PACKP
NC
RC2
REG25
SCL
NO.
C2
A2
A3
D2
B3
B2
D3
E1
E3
SDA
C3
SRN
B1
SRP
A1
VPWR
VSS
TS
C1
D1
E2
I/O (1)
IA
O
O
IO
IA
IO
IO
P
IO
IO
IA
IA
P
P
IA
Pin Functions
DESCRIPTION
Cell-voltage measurement input. ADC input
External high-side N-channel charge FET driver
External high-side N-channel discharge FET driver
HDQ serial communications line. Open-drain
Pack voltage measurement input for protector operation
Not used. Reserved for future GPIO. Recommended to connect to GND.
General purpose IO. Push-pull output
Regulator output and bq27741-G1 processor power. Decouple with 1-µF ceramic capacitor to VSS.
Slave I2C serial communications clock input line for communication with system. Use with 10-kΩ
pullup resistor (typical).
Slave I2C serial communications data line for communication with system. Open-drain I/O. Use with
10-kΩ pullup resistor (typical).
Analog input pin connected to the internal coulomb counter where SRN is nearest the CELL+
connection. Connect to sense resistor.
Analog input pin connected to the internal coulomb counter where SRP is nearest the PACK+
connection. Connect to sense resistor.
Power input. Decouple with 0.1-µF ceramic capacitor to VSS.
Device ground
Pack thermistor voltage sense (use 103AT-type thermistor). ADC input
(1) IO = Digital input-output, IA = Analog input, P = Power connection, O = Output
Copyright © 2013–2015, Texas Instruments Incorporated
Product Folder Links: bq27741-G1
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