BQ27425-G2_15 Datasheet, PDF (2/39 Pages) Texas Instruments – Fuel Gauge With Integrated Sense Resistor

bq27425-G2
SLUSB23B – OCTOBER 2012 – REVISED JUNE 2015
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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....................... 4
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics: Power-On Reset .............. 5
7.6 2.5-V LDO Regulator ................................................ 5
7.7 Integrating ADC (Coulomb Counter) Characteristics 5
7.8 Integrated Sense Resistor Characteristics................ 6
7.9 ADC (Temperature and Cell Measurement)
Characteristics ........................................................... 6
7.10 EEPROM Memory Characteristics.......................... 6
7.11 Timing Requirements: I²C-Compatible Interface
Communication .......................................................... 7
7.12 Typical Characteristics ............................................ 7
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........................................................... 15
8.6 Register Maps ......................................................... 27
9 Application and Implementation ........................ 28
9.1 Application Information............................................ 28
9.2 Typical Application .................................................. 29
10 Power Supply Recommendations ..................... 31
10.1 Power Supply Decoupling ..................................... 31
11 Layout................................................................... 31
11.1 Layout Guidelines ................................................. 31
11.2 Layout Example .................................................... 32
12 Device and Documentation Support ................. 33
12.1 Community Resources.......................................... 33
12.2 Trademarks ........................................................... 33
12.3 Electrostatic Discharge Caution ............................ 33
12.4 Glossary ................................................................ 33
13 Mechanical, Packaging, and Orderable
Information ........................................................... 33
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (February 2013) to Revision B
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section .................................................................................................. 1
Changes from Original (October 2012) to Revision A
Page
• AVAILABLE OPTIONS table: Replaced "Contact Factory" with orderable quantities for bq27425YZFR-G2A and
bq27425YZFT-G2B ................................................................................................................................................................ 3
• AVAILABLE OPTIONS table: Added CHEM_ID column ........................................................................................................ 3
• Recommended Operating Conditions: Added SHUTDOWN mode specifications ................................................................. 4
• OPERATING MODES: Added text "In SHUTDOWN mode, ...." .......................................................................................... 12
• Changed Figure 6, POWER MODE DIAGRAM. Added OFF and SHUTDOWN modes to diagram. .................................. 13
• Changed the CHEM_ID subcommand section: (CHEM_ID: 0x0008) .................................................................................. 17
• Data Block Summary: Updated Default Value column to show -G2B version differences in (Green Text) ......................... 24
• Data Block Summary: Changed Units value from Reserve Cap-mAh and Design Capacity from "mA" to "mAh" .............. 24
• Data Block Summary: Updated several Class/Subclass descriptions to correct [RAM] vs [NVM] indication. ..................... 24
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