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 more information, contact Microchip Sales. The TA100 has the capability to do far more than just act as an SSS subsystem for a WPC power transmitter. Multiple security use cases beyond authentication of the WPC power transmitter can readily be implemented in the same TA100 in parallel for an automotive system. That is, however, beyond the scope of this application note. This application note is solely focused on what is required to implement a 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. WPC 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. This specification is only available to WPC members. Only WPC Slot 0 is required for a valid WPC authentication implementation. WPC Slot 1 is entirely optional.
WPC Slots 2 and 3 are designated as proprietary certificate chain slots that can be utilized by manufacturers in their own specific and unique ways. The certificate chains are limited in terms of their implementation to be accessed from the power transmitter, but the specific formatting is not specified.
The vast majority of current implementations rely solely on WPC Slot 0, and that is the focus in TA100 Configuration.