2.2.1 Power Input Using USB Type-C Connector
The AM263Px Control Card can be powered through a USB type-C connection. The USB Type-C source is
capable of providing 3 A at 5 V and advertises the current sourcing capability through the CC1 and CC2
signals. On this EVM, the CC1 and CC2 from the USB type-C connector are interfaced to the port controller
IC (TUSB320LAIRWBR). This device uses the CC pins to determine port attach/detach, cable orientation, role
detection, and port control for Type-C current mode. The CC logic detects the Type-C current mode as default,
medium, or high depending on the role detected.
The Port pin is pulled down to ground with a resistor to configure the IC in upward facing port (UFP) mode.
VBUS detection is implemented to determine a successful attach in UFP mode. The OUT1 and OUT2 pins
are connected to a NOR gate. Active low on both the OUT1 and OUT2 pins advertises high current (3A) in
the attached state which enables the load switch (TPS22965DSGT) to provide the VBUS_MAIN supply which
powers other regulators that create the power rails for the device.
In UFP mode, the port controller IC constantly presents pull-down resistors on both CC pins. The port controller
IC also monitors the CC pins for the voltage level corresponding to the Type-C mode current advertisement
by the connected DFP. The port controller IC de-bounces the CC pins and waits for VBUS detection before
successfully attaching. As a UFP, the port controller device detects and communicates the advertised current
level of the DFP to the system through the OUT1 and OUT2 GPIOs.
The power requirement of the AM263Px Control Card is 5 V at 3 A. If the source is not capable of providing
the required power, then the output at the NOR gate becomes low that disables the VBUS_MAIN power switch.
Therefore, if the power requirement is not met, all power supplies except VSYS_TA_3V3 remains in the off state.
The board gets powered on completely only when the source can provide 5 V at 3 A.
Figure 2-3. Type-C CC Configuration
Table 2-1. Current Sourcing Capability and State of USB Type-C Cable
OUT1 OUT2 Advertisement
H H Default current in unattached state
H L Default current in attached state
L H Medium current (1.5A) in attached state
L L High current (3.0A) in attached state
The AM263Px Control Card includes a power supply based on a Power Management Integrated Chip (PMIC) for
each of the power rails. During the initial stage of the power supply, 5 V supplied by the type-C USB connector is
used to generate all of the necessary voltages required by the PMIC and subsequently the rest of the board via
the PMIC LDO outputs. For more information about the PMIC, refer to Section 2.2.5.
www.ti.com Hardware
SPRUJ86 – OCTOBER 2023
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AM263Px Control Card Evaluation Module 7
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