TPS65986 Datasheet, PDF (46/109 Pages) Texas Instruments – USB Type-C and USB PD Controller and Power Switch

TPS65986
SLVSD13A – OCTOBER 2015 – REVISED NOVEMBER 2015
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8.3.4.2 Multiplexer Connection Orientation
Table 4 shows the multiplexer connection orientation. For the USB D+/D– pair top and bottom port connections,
these connections are fixed. For the SBU port connections, the SBU crossbar multiplexer enables flipping of the
signal pair and the connections shown are for the upside-up orientation. The CORE_UARTn connections come
from a digital crossbar multiplexer that allows the UART_RX/TX to be mapped to any of the 1^st stage
multiplexers.
SYSTEM PIN
USB_RP_P
USB_RP_N
USB_EP_P
USB_EP_N
AUX_P
AUX_N
CORE_UART0_TX
CORE_UART0_RX
CORE_UART1_TX
CORE_UART1_RX
CORE_UART2_TX
CORE_UART2_RX
Table 4. Data Multiplexer Connections
USB TOP PIN
USB BOTTOM PIN
C_USB_TP
C_USB_TN
C_USB_TP
C_USB_TN
C_USB_TP
C_USB_TN
C_USB_TP
C_USB_TN
C_USB_BP
C_USB_BN
C_USB_BP
C_USB_BN
C_USB_BP
C_USB_BN
C_USB_BP
C_USB_BN
SBU MULTIPLEXER
PIN
SBU1
SBU2
SBU1
SBU2
8.3.4.3 Digital Crossbar Multiplexer
The TPS65986 UART path (UART_RX/TX pins) have digital inputs that pass through a cross-bar multiplexer
inside the digital core. These pins are configurable as an input or output of the cross-bar multiplexer. The digital
cross-bar multiplexer then connects to the port data multiplexers as shown in Figure 41. The connections are
configurable via firmware. The default state at power-up is to connect a buffered version of UART_RX to
UART_TX providing a bypass through the TPS65986 for daisy chaining during power on reset.
8.3.4.4 SBU Crossbar Multiplexer
The SBU Crossbar Multiplexer provides pins (C_SBU1 and C_SBU2) for future USB functionality as well as
Alternate Modes. The multiplexer swaps the output pair orientation based on the cable orientation. For more
information on Alternate Modes, refer to the USB PD Specification.
8.3.4.5 Signal Monitoring and Pullup/Pulldown
The TPS65986 has comparators that may be enabled to interrupt the core when a switching event occurs on any
of the port inputs. The input parameters for the detection are shown in Port Data Multiplexer Signal Monitoring
Pullup and Pulldown Characteristics. These comparators are disconnected by application code when these pins
are not digital signals but an analog voltage.
The TPS65986 has pullup and pulldown resistors between the first and second stage multiplexers of the port
switch for each port output: C_SBU1/2, C_USB_TP/N, C_USB_BP/N. The configurable pullup and pulldown
resistance between each multiplexer are shown in Figure 42.
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