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9.3 Feature Description
9.3.1 USB-PD Physical Layer
Figure 10
shows the USB PD physical layer block surrounded by a simplified version of the analog plug and
orientation detection block.
Fast
current
limit
PP_CABLE
C_CC1/2 Gate Control
and Current Limit
Digital Core
Figure 10. USB-PD Physical Layer and Simplified Plug and Orientation Detection Circuitry
USB-PD messages are transmitted in a USB Type-C system using a BMC signaling. The BMC signal is output
on the same pin (C_CC1 or C_CC2) that is DC biased because of the DFP (or UFP) cable attach mechanism
discussed in the
Cable Plug and Orientation Detection
9.3.1.1 USB-PD Encoding and Signaling
Figure 11
illustrates the high-level block diagram of the baseband USB-PD transmitter.
high-level block diagram of the baseband USB-PD receiver.
Data
Copyright © 2016, Texas Instruments Incorporated
C_CC1 Gate
Control
USB-PD
Phy
C_CC2 Gate
Control
4b5b
Encoder
CRC
Figure 11. USB-PD Baseband Transmitter Block Diagram
Product Folder Links:
SLVSDC2B – FEBRUARY 2016 – REVISED AUGUST 2016
LDO_3V3
LDO_3V3
section.
BMC
Encoder
TPS65981
TPS65981
C_CC1
C_CC2
Figure 12
illustrates the
to PD_TX
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