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Wireless power for IoT devices

As the Internet of Things (IoT) pervades our everyday life wearable devices represent one of the fastest-growing segments in consumer electronics. Together with mobile phones, the widespread adoption of wireless power is out there: in 2025, more than 2 billion receiver units are expected to be shipped worldwide*.Based on the STWBC-WA transmitter and STWLC04 receiver, ST’s wireless battery charging solution simplifies the design and shortens time-to market.Their minuscule footprint and efficient power transfer, while ensuring maximum safety and reliability are the main advantages that will benefit designers.

Key applications• Ultra-compactportabledevices,like:

• Wearabledevices• Sportsgear• Wellnessandhealthcareequipment• Sensors

Key features & benefits• Boostspowertransferof1Woveranultra-compactcoilof11mmindiameter

• Adaptsthetransmittedpowertoactualloadconditionswithdigitalfeedbacktothetransmittingdeviceforincreasedefficiency

• Enablessafeoperationwithforeignobjectdetection(FOD),andactivepresencedetectionstoppingpowertransferswhenmetallicormagneticobjectsaredetectedinthechargingarea(optionalfeature)

• Scalablesolutionsupportslowpowerapplicationsfrom1to3Wviadifferentcoils

• IdealfordifferentLi-ionandLi-polbatterychemistries

• Graphicaluserinterfaceforsystembehaviormonitoring

Scalable and complete 1 W wireless battery charging solution with Rx and Tx for fast prototyping

*SourceIHS2016

© STMicroelectronics - September 2016 - Printed in United Kingdom - All rights reservedThe STMicroelectronics corporate logo is a registered trademark of the STMicroelectronics group of companies

All other names are the property of their respective owners

For more information on ST products and solutions, visit www.st.comOrder code: FLWBC0916

Wireless battery charging solution tailored for portable devices ST’sturnkeysolutionforwirelessbatterychargingisdesignedforultra-compactbattery-operateddevicessuchaswearables,sportsgear,smartwatches,sensorsandwellnessequipment.

TheSTEVAL-ISB038V1referencedesignsupportswirelesspowertransferof1Woveran11mmcoilonthereceiversideand20mmontransmittersideandcanbescaled-upto3Wbyusingwidercoilsorbyswitchingtofull-bridgeconfigurationonthetransmitterside.

TheSTWBC-WAtransmitterisbasedonacost-effectivehalf-bridgetopology(optionalfull-bridge)andprovidesdesignerswithincreasedflexibilitythankstoapowerfulsoftwareAPIwhichallowsmodifyingthebehaviorofLEDandGPIOs,aswellasaddingexternalinterfacesviaI2CandUARTcommunicationports.

TheSTWLC04receivercandelivertheoutputpowerintwomodes:asapowersupplywithconfiguredoutputvoltageorasaCC/CVbatterychargerwithconfigurablechargingcurrentandvoltage.

TheSTEVAL-ISB038V1referencedesignincludesawirelesspowertransmitterboardandawirelesspowerreceiverboardcombinedwithaGUIanddocumentationtoshortenyourtime-to-market.

Theevaluationboardforthetransmitter(STEVAL-ISB038V1T)andthereceiver(STEVAL-ISB038V1R)arealsoavailableseparately.

order code description development environment

steval-isb038v1 Wearable wireless power system based on STWBC-WA and STWLC04 Application note: AN4900

steval-isb038v1t Wearable wireless power transmitter based on STWBC-WAUser manual: UM2099Firmware: STSW-ISB038TFWGraphical user interface: STSW-ISB038TGUI

steval-isb038v1r Wearable wireless power receiver based on STWLC04User manual: UM2098Graphical user interface: STSW-ISB038RGUI

stWbc-Wa Digital controller for wireless battery charger (WBC) transmitters for werable devices Databrief, Gerber files, BOM, schematics

stWlc04 Wireless power receiver for wearable devices Databrief, Gerber files, BOM, schematics

product table

steval-isb038v1: Wearable Wireless poWer system

Transmitter

STWLC04

Receiver

Fron

t

Back

Fron

t

Back

STWBC-WA

Ø 20 mmØ 11 mm