Battery Gasoline Gauge Reference Design 

The design enhances battery gas gauge accuracy for low-power IoT functions, integrating wi-fi connectivity, computerized pairing, and environment friendly energy administration.

The TIDA-01014 reference design from Texas Devices (TI) encompasses a high-accuracy battery gas gauge for low-power functions like Bluetooth-enabled wi-fi IoT discipline metering units. It enhances the wi-fi digital multimeter (DMM) reference design by enhancing gas gauge decision and accuracy whereas showcasing the state-of-battery reporting capabilities of the bq27426 gas gauge. The design additionally integrates TI’s NFC Bluetooth computerized pairing and CapTIvate capacitive contact applied sciences.

With the rise of battery-powered IoT sensors, industrial discipline devices and knowledge acquisition (DAQ) methods require dependable distant monitoring. Advances in sensor know-how and low-power connectivity, resembling TI’s options, now allow these devices to perform as wi-fi battery-powered methods, enhancing price effectivity, deployment, and reliability. Because of this, efficient battery administration has turn into essential, significantly in monitoring the battery’s state of cost (SoC). TI’s bq27426 gas gauge, initially designed for higher-power functions, additionally helps lower-power sensor nodes, as demonstrated on this reference design.

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The TIDA-01014 improves gas gauge accuracy by enhancing coulomb measurement decision by way of an elevated sense resistor and changes to the bq27426 discharge profile parameters. The system-side Impedance Monitor™ function offers key battery metrics, together with remaining capability, common present, voltage, energy, and SoC. Moreover, it calculates and experiences “time remaining” based mostly on these parameters.

To show these capabilities, the design makes use of an LIR2477 Li-Ion coin cell battery as an alternative of the AAA Li-Ion battery within the TIDA-01012 design. This 3.7-V, 150-mAh coin cell higher represents batteries usually utilized in sensor and discipline metering functions. The bq27426 determines battery state utilizing impedance monitoring and coulomb counting, each of which rely on correct present measurement.

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The bq27426 is a single-cell battery gauge with a pre-programmed chemistry profile that precisely predicts the capability and operational traits of a Li-based rechargeable cell utilizing patented Impedance Monitor know-how. A system processor can question the gadget for battery data, together with state of cost (SoC).

It presents three selectable pre-programmed profiles for 4.20-V, 4.35-V, and 4.40-V cells. The gauge experiences remaining capability and SoC with a smoothing filter, routinely adjusting for battery growing older, self-discharge, temperature, and price adjustments whereas estimating state-of-health. It helps a 400-kHz I²C serial interface.

The CC2640 is a wi-fi MCU designed for Bluetooth Low Vitality functions. As a part of the CC26xx household, it presents cost-effective, ultra-low-power 2.4-GHz RF efficiency. Its low energetic RF and MCU present consumption allow lengthy battery life, making it appropriate for small coin cell batteries and energy-harvesting functions.

The gadget encompasses a 32-bit ARM Cortex-M3 processor operating at 48 MHz, together with a wealthy set of peripherals, together with an ultra-low-power sensor controller. This controller autonomously collects analog and digital knowledge whereas the remainder of the system stays in sleep mode, making it perfect for functions requiring lengthy battery life and a compact type issue.

TI  has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) structure, and extra. The corporate’s web site has further knowledge concerning the reference design. To learn extra about this reference design, click on right here.