This versatile USB charger enables the wireless charging of small battery-powered devices equipped with Near Field Communication (NFC) technology. It features Renesas' industry-leading NFC transmitter, ensuring seamless compatibility between devices. The charger boasts a dust and waterproof design, as well as flexibility in coil placement, streamlining the antenna structure.

System Benefits:

  • Charge any NFC device with NFC-WLC wireless charging power transfer
  • Best matched with a PTX30W NFC listener system-on-chip (SoC) for efficient power transfer and antenna design flexibility
  • Sine wave + envelope output allows direct antenna connection
    • Low BOM count and easy-to-achieve Electromagnetic Compatibility (EMC) CE/FCC compliance
  • Current, voltage, and temperature sensing via USB for debugging/diagnostic purposes
    • Control commands and data monitoring via USB




Portable electronics supported for NFC-WLC charging (up to 2W):

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

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EU185 Power Monitor Power Monitor Power Monitor EU185 EU185 EU185 LDO LDO LDO Buck-Boost Buck-Boost Buck-Boost Current Sense Amp Current Sense Amp Current Sense Amp Temperature Sensor Temperature Sensor Temperature Sensor MCU MCU MCU 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 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 Make contact Sheet.222 Sheet.223 Sheet.224 Sheet.225 Sheet.226 E- E- E- E+ E+ E+ Out Out Out Vdd 1 Vdd Vdd NFC 1W Charger NFC 1W Charger NFC 1W Charger 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 I2C 3 I2C I2C I2C 2 I2C I2C Connector 1.410 Vdd 2 Vdd Vdd Right arrow 1pt.1045 n n n Sheet.419 User Botton User Botton User Botton HS Osc. HS Osc. HS Osc. 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 1* 1* 1* 2* 2* 2* I2C 1 I2C I2C 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*
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