High voltage (HV) bucks are widely used to power smart home IoT devices, home appliances, auxiliary power for industrial power, and E-meters. They are simple in design, low cost and require very little board space. Many electronic products use Bluetooth® Low Energy (BLE) to exchange data through PCs, smartphones, as well as dedicated BLE gateways. BLE has become one of the most popular standards for IoT applications. Renesas created a smart switching application by combining our HV buck and RX23W 32-bit microcontroller (MCU). This reference design shows a simple and effective design for a wall switch for smart appliances.

System Benefits​:

  • Renesas high voltage (HV) buck key advantages:
  • Zero standby power, good efficiency from light load to full load
  • Improved EMI by jittering and improved gate drive
  • Audible noise-free operation by avoiding operation in audible range
  • Renesas RX23W 32-bit MCU with BLE
  • Low power consumption in Tx and Rx and sleep mode
  • Supports capacitive touch

Target Applications:

  • Building automation
  • Home automation
AC/DC Non-Isolated Capacitive Touch Wall Switch