The P9242-R3 is a highly integrated 15W magnetic induction wireless power transmitter with in-band, bidirectional data communication requiring no additional circuitry. The communication channel can be used for proprietary device authentication and secure system data transfer.

The P9242-R3 includes a 32-bit Arm®  Cortex®-M0 processor, foreign object detection (FOD), wide input voltage range operation, full bridge drivers, and on-chip simultaneous voltage and current demodulation.

In addition, the P9242-R3 features programmable over-current protection, programmable LED output blinking pattern, and I²C serial interface protocol to read back information such as voltage, current, and fault conditions. This standard device is compliant with the WPC 1.2 specification. Combined with the P9221-R3 receiver, the P9242-R3 forms a complete wireless power system solution for 15W applications with bidirectional data communication.

The P9242-R3 has the bootloader and application firmware pre-programmed into internal one-time programmable (OTP) memory.

The P9242-RB, which is pin-compatible with the P9242-R3, has only the bootloader pre-programmed into OTP memory 
and uses external flash for the application firmware so that it can be changed for specific system requirements.

The P9242-R3 and P9242-RB are available in a lead-free, space-saving 48-VFQFN package. It is rated for -40 ºC to +85 ºC ambient operating temperature range.


  • Supports bidirectional data communication 
  • Enables authentication and system data transfer
  • Up to 15W of power transfer
  • 87% end-to-end efficiency when combined with the P9221-R3
  • VIN range: 4.25V to 21V
  • Integrated drivers for external power FETs
  • Integrated step-down switching regulator
  • Simultaneous voltage and current demodulation
  • Standard device compliant with WPC 1.2 specification
  • Supports I²C interface
  • -40 °C to +85 °C ambient operating temperature range
  • P9242-RB with an external flash supports firmware customization
  • 6mm x 6mm, 48-VFQFPN package




Type Title Date
Datasheet PDF 1.28 MB
Product Change Notice PDF 734 KB
Product Change Notice PDF 728 KB
Overview PDF 1.14 MB
Product Change Notice PDF 983 KB
Product Change Notice PDF 1.15 MB
Application Note Log in to Download PDF 3.74 MB
Datasheet - Short-form PDF 131 KB
White Paper PDF 627 KB
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Design & Development

Boards & Kits

Boards & Kits


IDT 15W Wireless Power Reference Kit w/ Bi-directional Communication

A brief overview of the WP15WBD-RK, a 15W WPC Qi-compatible wireless power reference kit featuring a bi-directional communication channel between the transmitter and receiver. The bi-directional data communication channel enables users to authenticate a wirelessly charged receiver device with a specific charging transmitter base or to transfer system data without any additional hardware.

For more information, visit www.IDT.com/WP15WBD-RK.