Texas Instruments TPS65982 User Manual

10.2.2.2.2 HD3SS460 Control and DisplayPort Configuration
The two Type-C ports in this design support DisplayPort simultaneously on both ports. When a system is not
capable of supporting video on both ports the system controller will disable DisplayPort on the second Type-C
port through I
2
C. Table 10-6 lists the DisplayPort configurations supported in the system. Table 10-7 lists the
summary of the TPS65982 GPIO signals control for the HD3SS460. Although the HD3SS460 is able to multiplex
the required AUX_N/P signals to the SBU_1/2 pins, they are connected through the TPS65982 for additional
support of custom alternate mode configurations.
Table 10-6. Supported DisplayPort Configurations
CONFIGURATION DisplayPort ROLE
DisplayPort
PIN ASSIGNMENT
DisplayPort LANES
Configuration 1 DFP_D Pin Assignment C 4 Lane
Configuration 2 DFP_D Pin Assignment D 2 Lane and USB 3.1
Configuration 3 DFP_D Pin Assignment E 4 Lane (Dongle Support)
Table 10-7. TPS65982 and HD3SS460 GPIO Control
TPS65982 GPIO HD3SS460 CONTROL PIN DESCRIPTION
GPIO_0 AMSEL Alternate Mode Selection (DP/USB3)
GPIO_3 EN Super Speed Mux Enable
DEBUG2 POL Type-C Cable
10.2.2.2.3 9.3.2.3 DC Barrel Jack and Type-C PD Charging
The system is design to either charge over Type-C or from the DC barrel jack. The TPS65982 detects that the
DC barrel jack is connected to GPIOn. In the simplest form, a voltage divider could be set to the GPIO I/O level
when the DC Barrel jack voltage is present, as shown in Figure 10-4. A comparator circuit is recommend and
used in this design for design robustness, as shown in Figure 10-5.
Barrel Jack Detect
and PFET Enable
100 kΩ
10 kΩ
1.81 V
20 V
DC Barrel Jack
Figure 10-4. DC Barrel Jack Voltage Divider
+
100 kΩ
10 kΩ
1.8 V
DC Barrel Jack Voltage
Barrel Jack Detect/
PFET Enable
Figure 10-5. Barrel Jack Detect Comparator
This detect signal is used to determine if the barrel jack is present to support the 20 V PD power contracts and
to hand-off charging from barrel jack to Type-C or Type-C to barrel jack. When the DC barrel jack is detected
the TPS65982 at each Type-C port will not request 20 V for charging and the system will be able to support a
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TPS65982
SLVSD02E – MARCH 2015 – REVISED AUGUST 2021
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Texas Instruments TPS65982 Specifications

General

Brand	Texas Instruments
Model	TPS65982
Category	Motherboard
Language	English