SLVSFN9A September 2020 – August 2021 TPS65988DK
PRODUCTION DATA
The TPS65988DK cable plug block contains additional circuitry that may be used to support the Fast Role Swap (FRS) behavior defined in the USB Power Delivery Specification. The circuitry provided for this functionality is detailed in Figure 8-15.
When a TPS65988DK port is operating as a sink with FRS enabled, the TPS65988DK monitors the CC pin voltage. If the CC voltage falls below VTH_FRS a fast role swap situation is detected and signaled to the digital core. When this signal is detected the TPS65988DK ceases operating as a sink and begin operating as a source.
When a TPS65988DK port is operating as a source with FRS enabled, the TPS65988DK digital core can signal to the connected port partner that a fast role swap is required by enabling the R_FRSWAP pull down on the connected CC pin. When this signal is sent the TPS65988DK ceases operating as the source and begin operating as a sink.