USB7056 datasheet(34/55 Pages) MICROCHIP

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USB7056

DS00002675F-page 34

 2022 Microchip Technology Inc. and its subsidiaries

8.4

CC Pin Orientation and Detection

The device provides CC1 and CC2 pins on all Type-C ports for cable plug orientation and detection of a USB Type-C

receptacle. The device also integrates a comparator and DAC circuit to implement Type-C attach and detach functions,

which supports up to eight programmable thresholds for attach detection between a UFP and DFP. When operating as

a UFP, the device supports detecting changes in the DFP’s advertised thresholds. Default nominal values for the thresh-

olds detected by the CC comparator are:

•0.20 V

•0.40 V

•0.66 V

•0.80 V

•1.23 V

•1.60 V

•2.60 V

When operating as a DFP, the device implements current sources to advertise current charging capabilities on both CC

pins. When a UFP connection is established, the current driven across the CC pins creates a voltage across the UFP’s

Rd pull-down that can be detected by the integrated CC comparator. When connected to an active cable, an alternative

pull-down, Ra, appears on the CC pin.

When operating as a UFP, the device applies an Rd pull-down on both CC lines and waits for a DFP connection from

the assertion of VBUS. The CC comparator is used to determine the advertised current charger capabilities supported

by the DFP.

VCONN is a 5V supply used to power circuitry in the USB Type-C plug that is required to implement Electronically

Marked Cables. By default the DFP always sources VCONN when connected to an active cable. The USB7056 requires

the use of two external VCONN FETs. The device provides the enables for these FETs, and can detect an OCS by mon-

itoring the output voltage of the FET via the CC pins.

The device also implements a comparator for determining when a VBUS is within a programmed range, vSafe5V or

vSafe0V. VBUS is divided down externally to provide a nominal 3.3V at the VBUS_MON pin. For a DFP, the VBUS com-

parator is useful to detect when VBUS is within the desired range per power delivery negotiations. For a UFP, the VBUS

comparator is utilized to determine when a DFP is attached or detached. It may also use the comparator to determine

when VBUS is within a new voltage range per power delivery negotiations.

8.5

PortSplit

The PortSplit feature allows the USB 2.0 and USB 3.2 PHYs associated with any downstream port to be operationally

separated. The intention of this feature is to allow a system designer to connect an embedded USB 3.x device to the

USB 3.2 PHY, while allowing the USB 2.0 PHY to be used as either a standard USB 2.0 port or with a separate embed-

ded USB 2.0 device. PortSplit can be configured via OTP/SMBus. By default, all ports are configured to non-split mode.

When PortSplit is disabled on a specific port, the corresponding PRT_CTLx pin controls both the USB 2.0 and USB 3.2

portions of the port (port power and overcurrent condition). When PortSplit is enabled on a specific port, the corre-

sponding PRT_CTLx pin controls the USB 2.0 portion of the port, and the corresponding PRT_CTLx_U3 pin controls

the USB 3.2 portion of the port.

Note:

The USB7056 hub internally manages the protocol and policy for each USB Power Delivery port, and con-

trols external power circuitry via a companion UPD350 controller.

Note:

The USB7056 requires a serially-connected SPI Flash to contain the application-specific firmware, other-

wise functions such as Power Delivery will have minimal functionality. Refer to the “Configuration of the

USB7002/USB705x

” application note for additional information.

Note:

The native USB Type-C functionality (including CC pin orientation and detection features) is managed

autonomously by the USB7056.

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