The Texas Instruments bq27421-G1 fuel gauge is a minimally configured microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires very little user configuration and system microcontroller firmware development.
The bq27421-G1 fuel gauge uses the patented Impedance TrackTM algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).
Battery fuel gauging with the bq27421-G1 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny 9-ball, 1.62 mm × 1.58 mm, 0.5-mm pitch NanoFree™ chip scale package (DSBGA) is ideal for space-constrained applications.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | bq27421-G1 System-Side Impedance Track Fuel Gauge With Integrated Sense Resistor datasheet (Rev. E) | PDF | HTML | Jan 6, 2016 |
| * | User guide | bq27421-G1 Technical Reference Manual (Rev. C) | Aug 15, 2016 | |
| Technical article | Get smart: How intelligent battery gauges improve battery life in continuous gluco | PDF | HTML | Apr 19, 2019 | |
| Application note | Achieving The Successful Learning Cycle | PDF | HTML | Jun 19, 2018 | |
| Application note | Simple Guide to Chemical ID Selection Tool (GPC) (Rev. A) | PDF | HTML | Jun 5, 2018 | |
| Application note | Gauge Communication | Jan 12, 2017 | ||
| Application note | Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm (Rev. A) | PDF | HTML | May 16, 2014 | |
| More literature | Quickstart Guide for bq27421-G1 (Rev. B) | May 6, 2014 | ||
| Application note | Verification and Accuracy Test Methods of Gas Gauges | Jun 5, 2013 | ||
| Application note | Going to Production With the bq274xx Family of Gas Gauges | Jun 27, 2011 |
For additional terms or required resources, click any title below to view the detail page where available.
The EV2400 EVM interface board enables an IBM-compatible or other type PC (with the required driver for its particular platform) to communicate with the Texas Instruments SMBus or I2C interface gas gauges via a Universal Serial Bus (USB) port. In addition to this board, PC software is required to (...)
Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)
The Linux driver supports the BQ27x series of Battery Fuel Gauges. The Linux driver supports communication through the I2C/HDQ bus and interfaces with the power supply sub-system to monitor battery properties.
Available in Linux Main line: Yes
Available through git.ti.com: N/A
BQ-BATTERY-PROGRAMMER-SW software development kit (SDK) is a collection of robust software command line tools that assist with the process of programming, testing, or assembling packs that use TI Battery management products. The executables in this software work with the MKST-3P-ALT-EV2300 MKS (...)
This reference design is a complete evaluation system solution for the bq27421. The solution includes one bq27421 circuit module with an integrated current-sense resistor. A separated orderable EV2300 or EV2400 PC interface board for gas gauge interface along with a PC USB cable, and (...)
This reference design is targeted at space-limited portable applications. The devices in the design operate from either a USB port or AC adapter. The solution has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system (...)
This reference design delivers up to 1000 mA of continuous current to the battery output when programmed with a resistor on the ISET pin and is programmed at the factory for ~540mA. The USB current limit modes are selected by the ISET2 pin and limits current to a maximum of 500 mA (logic high) or (...)
This reference design is a Single-Chip Charge and Dynamic Power-Path Management IC solution. It is a complete bq24030 based circuit design and provides a convenient method to evaluate the operation and performance of the IC. The development solution includes a tested evaluation board; a user guide (...)
This reference design is designed to deliver up to 1 A of continuous current to the battery and/or system. It has a 4.9 VDC, 50 mA max internal LDO that can be used for USB applications or any other need. It uses the bq25070, a highly integrated LiFePO4 linear battery charger, in order to target (...)
This reference design is a solution for a Li-Ion charge management IC. It has a highly integrated battery charge IC utilizing synchronous switch mode power conversion for efficient and comprehensive charge control of a single cell Li-Ion battery. The solutionprovides a convenient method to evaluate (...)
The TIDA-00586 reference design is a gauge that has been designed as a booster pack to fit on the TI Launchpad development boards. The use of this this board for development will reduce the time spent in design and test of the bq27421 gauge IC. You can select any appropriate charger to charge your (...)
The TIDA-00669 is a BoosterPack™ reference design that provides a wireless charger and battery management to power any TI LaunchPad™ (www.ti.com/launchpad). This is a highly-integrated power management reference design that is well-suited for low-power applications. The primary method of storage is (...)
This reference design is for smartwatch battery management solution (BMS). It is suitable for low-power wearable devices like smartwatch applications. The design includes an ultra-low current 1 cell Li-ion linear charger; a highly integrated Qi-compliant wireless power receiver; a (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| DSBGA (YZF) | 9 | Ultra Librarian |
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