SLVSGO0 October 2024 TPS25763-Q1
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
When Port A is configured as a Source, the device detects when a cable or a Sink is attached using the Px_CC1 and Px_CC2 pins. When in a disconnected state, the device monitors the voltages on these pins to determine what, if anything, is connected. See USB Type-C Specification for more information.
Table 8-5 shows the Cable Detect States for a Source.
Px_CC1 | Px_CC2 | CONNECTION STATE | RESULTING ACTION |
---|---|---|---|
Open | Open | Nothing attached | Continue monitoring both Px_CCy pins for attach. Power is not applied to Px_VBUS or VCONN. |
Rd | Open | Sink attached | Monitor Px_CC1 for detach. Power is applied to Px_VBUS but not to VCONN (Px_CC2). |
Open | Rd | Sink attached | Monitor Px_CC2 for detach. Power is applied to Px_VBUS but not to VCONN (Px_CC1). |
Ra | Open | Powered Cable-No UFP attached | Monitor Px_CC2 for a Sink attach and Px_CC1 for cable detach. Power is not applied to Px_VBUS or VCONN (Px_CC1). |
Open | Ra | Powered Cable-No UFP attached | Monitor Px_CC1 for a Sink attach and Px_CC2 for cable detach. Power is not applied to Px_VBUS or VCONN (Px_CC2). |
Ra | Rd | Powered Cable-UFP Attached | Provide power on Px_VBUS and VCONN (Px_CC1) then monitor Px_CC2 for a Sink detach. Px_CC1 is not monitored for a detach. |
Rd | Ra | Powered Cable-UFP attached | Provide power on Px_VBUS and VCONN (Px_CC2) then monitor Px_CC1 for a Sink detach. Px_CC2 is not monitored for a detach. |
When a port is configured as a Source, a current IRp1.5A, is driven out of each Px_CCy pin and each pin is monitored for different states. When a Sink is attached to the port a pull-down resistance of Rd to GND exists. The current IRp1.5A is then forced across the resistance Rd generating a voltage at the Px_CCy pin. The device applies the configured IRp1.5A until the buck-boost regulator is enabled and operating at 5 V, at which time application firmware may remain at IRp1.5A or change to IRp3.0A.
When the Px_CCy pin is connected to an electronically marked cable VCONN input, the pull-down resistance is different (Ra). In this case the voltage on the Px_CCy pin pulls below VRDstd and the system recognizes the electronically marked cable.
The VDstd1.5 or VD3.0 threshold is monitored to detect a disconnection depending upon which Rp current source is active. When a connection has been recognized and the voltage on Px_CCy subsequently rises above the disconnect threshold for tCC, the system registers a disconnection.