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Universal NFC Wireless Charger

Overview

Technological advancements in smart devices and wearables are driving the demand for wireless charging technology, enhancing user experience with hassle-free, clutter-free power delivery that aligns with modern consumer expectations for innovative products.

This universal wireless charger for small battery-powered devices is equipped with Near Field Communication (NFC) technology, featuring Renesas' industry-leading NFC transmitter. It ensures seamless compatibility across devices, making it ideal for applications such as smartwatches, fitness trackers, medical sensors, and IoT devices, providing reliable and convenient power solutions for a wide range of modern electronics.

System Benefits:

  • Universal compatibility to charge any NFC device with NFC wireless charging (WLC) power transfer.
  • Efficient power transfer and antenna design flexibility when paired with an NFC listener system-on-chip (SoC).
  • Simplified design with direct antenna connection and low BOM count for Electromagnetic Compatibility (EMC) CE/FCC compliance.
  • Real-time monitoring for remote management with current, voltage, and temperature sensing via USB.

Block Diagram

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EU185Make contactSheet.222Sheet.223Sheet.224Sheet.225Sheet.226EU185EU185EU185LDOLDOLDOBuck-BoostBuck-BoostBuck-BoostUSB PlugSheet.149Sheet.150Sheet.151Sheet.152Sheet.153Sheet.197Turn-off triode.241Turn-off triode.242Turn-off triode.243Sheet.172Darlington.244Sheet.174Sheet.175Sheet.176Sheet.305Sheet.306Sheet.307Sheet.308ShuntShuntShuntSheet.320Sheet.321Sheet.322Sheet.323Sheet.324Sheet.32516 MHZ16 MHZ16 MHZSheet.327Sheet.328Sheet.329Sheet.330Sheet.331Sheet.33232 kHZ32 kHZ32 kHZSheet.369Sheet.372Sheet.375Connector dotted arrowConnector ArrowConnector dotted arrow.380Sheet.381Sheet.382Sheet.383Connector Arrow.384Connector Arrow.385Connector Arrow.386Connector Arrow.387Connector Arrow.388Sheet.390Sheet.395NFC CoilNFC CoilNFC CoilSheet.147Transformer.324Line.841Line.842Sheet.392Inductor.300Sheet.144Sheet.145Sheet.146Sheet.396Sheet.397Connector Arrow.398Connector Arrow.399Connector Line.401Connector 1Connector dotted arrow.403Connector 1.404Connector 1.405Connector dotted arrow.406~5V~5V~5VConnector 1.410Right arrow 1pt.1045nnnSheet.419User BottonUser BottonUser BottonSupply Voltage ControlSupply Voltage ControlSupply VoltageControlCommunication Lines 1222Sheet.426Communication Lines 1.427222Sheet.429ChargeChargeChargeCommunication Lines 1.433222Sheet.4352*2*2*3.0-5.4V3.0-5.4V3.0-5.4V1* In some use cases a smaller MCU might be sufficient, e.g.if no USB communication is needed. 2* Alternative: direct or controlled supply.1*In some use cases a smaller MCU might be sufficient, e.g.if...1*In some use cases a smaller MCU might be sufficient, e.g.if no USB communication is needed.2*Alternative: direct or controlled supply.2*2*2*3.3V3.3V3.3VSheet.447MCUMCU1*MCU1*I2C 6I2CI2CI2C 5I2CI2CI2C 4I2CI2CUSBUSBUSBDACDACDACVdd 3VddVdd32KHz RTC32KHz RTC32KHz RTCDebugDebugDebugGPIOGPIOGPIOHS Osc.HS Osc.HS Osc.Sheet.448Power MonitorPower MonitorPower MonitorI2CI2CI2CSheet.449Temperature SensorTemperature SensorTemperature SensorI2CI2CI2CVdd 2VddVddSheet.450NFC 1W ChargerNFC 1W ChargerNFC 1W Charger I2CI2CI2CSheet.451Current Sense AmpCurrent Sense AmpCurrent Sense AmpE-E-E-E+E+E+OutOutOutVdd 1VddVdd

LDO

Linear Regulators (LDO)

MCU

RA Arm Cortex-M MCUs
RX 32-Bit Performance/Efficiency MCUs

Power Monitor

Current Sense Amplifiers

NFC 1W Charger

NFC

Current Sense Amp

Current Sense Amplifiers

Buck-Boost

Buck-boost Regulators (Integrated FETs)

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