Enhanced Accuracy Battery Fuel Gauge Reference Design for Low Power Industrial IoT Field Metering


Design files


The Internet of Things (IoT) revolution is efficiently connecting applications and instruments, enabling battery powered, wide scale very low power sensor deployment.  New technologies, such as TI’s advanced sensor and low power connectivity devices, are enabling these instruments to be designed as battery powered wireless systems dramatically improving cost, deployment, reliability, performance and complexity.

Enabled by Texas Instruments’ SimpleLink™ ultra-low power wireless micro-controller (MCU) platform, the TIDA-01014 reference design utilizes the TIDA-01012 wireless DMM reference design to demonstrate how the bq27426 can be used to enhance the battery management system’s fuel gauge performance and ultimately optimize consumption. The TIDA-01014 features a wirelessly connected, 4½ Digit, 100kHz true RMS, DMM with Bluetooth Low Energy® (BLE) connectivity, NFC Bluetooth pairing, and an Automatic Wake-Up feature enabled by TI’s CapTIvateTM technology.

  • Wireless MCU enabling Bluetooth low energy (BLE) for IoT wireless
  • Low power design and power management systems
  • Battery discharge monitoring
  • Increased fuel gauge accuracy and resolution
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.


Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDRQI7.ZIP (1901 K)

Files used for 3D models or 2D drawings of IC components

TIDCDB6.ZIP (1229 K)

Design file that contains information on physical board layer of design PCB

TIDRQI6.PDF (4433 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog switches & muxes

TS3A241590.3-Ω on-state resistance, 3.3-V, 2:1 (SPDT), 2-channel analog switch with 1.8-V input logic

Data sheet: PDF | HTML
Analog switches & muxes

TS5A31660.9-Ω on-state resistance, 5-V, 1:1 (SPST), 1-channel analog switch (active high)

Data sheet: PDF | HTML
Analog switches & muxes

TS5A33591-Ω on-state resistance, 5-V, 3:1 (SP3T), 1-channel analog multiplexer

Data sheet: PDF | HTML
Auto-direction voltage translators

LSF0102Dual bidirectional multi-voltage level translator

Data sheet: PDF | HTML
Auto-direction voltage translators

LSF02044-Bit Bidirectional Multi-Voltage Level Translator for Open-Drain & Push- Pull

Data sheet: PDF | HTML
Battery charger ICs

BQ24232USB Friendly 0.5A Li-ion charger w/ Dynamic power Management, 10.5V OVP

Data sheet: PDF | HTML
Battery fuel gauges

BQ27426Single cell System-side battery fuel (gas) gauge w/Pre-programmed chemistry Profile

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS627402.2V-5.5V input, ultra-low-power 300mA step-down buck DCDC converter with 360nA Iq

Data sheet: PDF | HTML
Fully differential amplifiers

THS4531Ultra low power 0.25mA, RRO, fully differential amplifier

Data sheet: PDF | HTML
General-purpose op amps

OPA313Single, 5.5-V, 1-MHz, low quiescent current (50-μA), RRIO operational amplifier

Data sheet: PDF
Linear & low-dropout (LDO) regulators

TPS782150-mA, nano-IQ, low-dropout voltage regulator with enable from -40°C to +125°C

Data sheet: PDF | HTML
Low-power 2.4-GHz products

CC2640SimpleLink™ 32-bit Arm Cortex-M3 Bluetooth® Low Energy wireless MCU with 128kB Flash

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430FR2532Capacitive Touch MCU with 8 touch IO (8 sensors), 8KB FRAM, 1KB SRAM, 15 IO, 10-bit ADC

Data sheet: PDF | HTML
Other wireless products

RF430CL330HDynamic Dual Interface NFC Transponder

Data sheet: PDF | HTML
Precision ADCs

ADS888518-Bit, 400-kSPS, 1-Ch SAR ADC with True-Differential Input, SPI Interface and Daisy-Chain

Data sheet: PDF
Precision op amps (Vos<1mV)

OPA333Micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier

Data sheet: PDF | HTML
Series voltage references

REF33252.5-V, 30-ppm/°C drift, 3.9-µA, 3-pin SOT-23, 3-pin SC70, 8-pin UQFN voltage reference

Data sheet: PDF | HTML
Supervisor & reset ICs

TPS3422Single-channel push-button controller with configurable delay & reset pulse

Data sheet: PDF | HTML

Start development


Technical documentation

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Type Title Date
* Design guide Enhanced Accuracy Battery Fuel Gauge Ref Design for Low-Power Industrial IoT Mar. 31, 2017

Related design resources

Reference designs

TIDA-01012 Wireless IoT, Bluetooth® Low Energy, 4½ Digit, 100kHz True RMS Digital Multimeter TIDC-01012 Industry 4.0 NFC and Bluetooth® Low Energy User Interface Reference Design for IoT Metering

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