2 Implementing with the TA100
The TA100 is a WPC-approved SSS based on its JIL HIGH rating. The analysis was performed by SERMA Safety and Security. For additional details, contact Microchip Sales. While the TA100 supports a wide range of security functions beyond serving as an SSS for a WPC power transmitter, including the ability to support multiple security use cases in parallel within an automotive system, those capabilities are outside the scope of this application note. This document focuses exclusively on the requirements for implementing WPC Power Transmitter authentication using the TA100.
Packaging Options
- TA100 with an SPI interface in an 8-pin SOIC package
- TA100 with an I2C interface in an 8-pin SOIC package
- TA100 with both I2C and SPI interfaces in a 24-pin, 4 mm x 4 mm VQFN package (either interface may be used)
WPC Certificate Chain Slots
The WPC authentication standards allow for up to four WPC Certificate Chain Slots. Slots 0 and 1 are specifically designated for WPC-defined certificate chains and are fully defined in the latest version of the WPC authentication specification, which is available only to WPC members.
WPC Slot 0 is mandatory and must be populated for a compliant WPC authentication implementation. WPC Slot 1 is optional and may be used if additional WPC-defined certificate chains are required.
WPC Slots 2 and 3 are designated for proprietary use. These slots may be leveraged by manufacturers for custom or value-added security implementations. While access to these certificate chains is limited to the power transmitter, their internal structure and formatting are not defined by the WPC specification.
The majority of existing implementations rely exclusively on WPC Slot 0, which is the focus of the TA100 Configuration section.