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Qi 1.3 Wireless Charging Reference Design For Developing Qi Transmitter

The reference design is compliant with the latest Qi 1.3 specification and accelerates development of automotive and consumer Qi transmitter

The recently released Qi 1.3 specification by the Wireless Power Consortium (WPC) requires authentication for improved safety when transmitting up to 15W of power between a transmitter and a receiver. To meet this requirement here’s presenting a new Qi 1.3 wireless charging reference design by Microchip Technology that assists developers of wireless charging systems for automotive and consumer applications with the necessary tools and support for seamlessly integrating and certifying new-generation product designs.

Qi 1.3 is a significant update from Qi 1.2.4, mandating hardware-based authentication between transmitter and receiving devices for power transfer above 5W. The Qi 1.3 reference design provides fast product development and fully integrates secure storage subsystem software with the wireless power microcontroller (MCU), enabling custom topologies and foreign object detection (FOD) implementation. 

By adhering to the new authentication standard, designers can ensure phones receiving 15W are receiving it from a Qi-certified authenticated transmitter to ensure safety.

“Wireless charging makes it easy and convenient for consumers to charge devices and, as a result, demand for these systems in the automotive and consumer segments is on the rise,” said Joe Thomsen, vice president, MCU16 business unit. “Qi 1.3 reference design, tools and support help engineers to meet rapidly evolving development requirements and enable easy certification of the new Qi 1.3 transmitter designs, speeding time to market and easing end-product certification.”

The reference design includes: 

  • Qi controller
  • Qi application software
  • Provisioned authentication controller (WPC-approved secure storage system)
  • Crypto software libraries

It also includes a complete list of schematics, bill of materials, software and design guidelines. 

To support its Qi 1.3 wireless power solution, Microchip provides the dsPIC33C family of devices to run the Qi application software and the ECC608/TA100 secure storage subsystem provisioned by Microchip as a licensed WPC Manufacturing Certificate Authority. This reference design also incorporates MIC4605 and MCP14700 gate drivers, MCP16331 and MCP1725 regulators, an MCP6C02 current sense device, an ATA6563 CAN transceiver and an MCP9700 temperature sensor.

Microchip’s Qi 1.3 wireless charging transmitter reference design is available for demonstrations and evaluations for qualified customers. Evaluation boards for the reference design will be available in August 2021.


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