Renesas Electronics Corporation
Search

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.
  • Stylus
  • Smart ring
  • Smart glasses
  • Wearable devices
  • Hearing aid
  • Medical sensors

Block Diagram

Select a block to discover products for your design

Available on Lab on the Cloud - Use our PC-based GUI to instantly start configuring and testing.

Launch Lab on the Cloud
EU185 Make contact Sheet.222 Sheet.223 Sheet.224 Sheet.225 Sheet.226 EU185 EU185 EU185 LDO LDO LDO Buck-Boost Buck-Boost Buck-Boost USB Plug Sheet.149 Sheet.150 Sheet.151 Sheet.152 Sheet.153 Sheet.197 Turn-off triode.241 Turn-off triode.242 Turn-off triode.243 Sheet.172 Darlington.244 Sheet.174 Sheet.175 Sheet.176 Sheet.305 Sheet.306 Sheet.307 Sheet.308 Shunt Shunt Shunt Sheet.320 Sheet.321 Sheet.322 Sheet.323 Sheet.324 Sheet.325 16 MHZ 16 MHZ 16 MHZ Sheet.327 Sheet.328 Sheet.329 Sheet.330 Sheet.331 Sheet.332 32 kHZ 32 kHZ 32 kHZ Sheet.369 Sheet.372 Sheet.375 Connector dotted arrow Connector Arrow Connector dotted arrow.380 Sheet.381 Sheet.382 Sheet.383 Connector Arrow.384 Connector Arrow.385 Connector Arrow.386 Connector Arrow.387 Connector Arrow.388 Sheet.390 Sheet.395 NFC Coil NFC Coil NFC Coil Sheet.147 Transformer.324 Line.841 Line.842 Sheet.392 Inductor.300 Sheet.144 Sheet.145 Sheet.146 Sheet.396 Sheet.397 Connector Arrow.398 Connector Arrow.399 Connector Line.401 Connector 1 Connector dotted arrow.403 Connector 1.404 Connector 1.405 Connector dotted arrow.406 ~5V ~5V ~5V Connector 1.410 Right arrow 1pt.1045 n n n Sheet.419 User Botton User Botton User Botton Supply Voltage Control Supply Voltage Control Supply VoltageControl Communication Lines 1 2 2 2 Sheet.426 Communication Lines 1.427 2 2 2 Sheet.429 Charge Charge Charge Communication Lines 1.433 2 2 2 Sheet.435 2* 2* 2* 3.0-5.4V 3.0-5.4V 3.0-5.4V 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. 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* 3.3V 3.3V 3.3V Sheet.447 MCU MCU1* MCU1* I2C 6 I2C I2C I2C 5 I2C I2C I2C 4 I2C I2C USB USB USB DAC DAC DAC Vdd 3 Vdd Vdd 32KHz RTC 32KHz RTC 32KHz RTC Debug Debug Debug GPIO GPIO GPIO HS Osc. HS Osc. HS Osc. Sheet.448 Power Monitor Power Monitor Power Monitor I2C I2C I2C Sheet.449 Temperature Sensor Temperature Sensor Temperature Sensor I2C I2C I2C Vdd 2 Vdd Vdd Sheet.450 NFC 1W Charger NFC 1W Charger NFC 1W Charger I2C I2C I2C Sheet.451 Current Sense Amp Current Sense Amp Current Sense Amp E- E- E- E+ E+ E+ Out Out Out Vdd 1 Vdd Vdd

LDO

Linear Regulators (LDO)

MCU

RA Arm Cortex-M MCUs

Power Monitor

Current Sense Amplifiers

NFC 1W Charger

NFC

Current Sense Amp

Current Sense Amplifiers

Buck-Boost

Buck-boost Regulators (Integrated FETs)