USB7252PSLASHKDX datasheet(41/64 Pages) MICROCHIP

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2018 - 2020 Microchip Technology Inc.

DS00003561A-page 41

USB7252P

For detailed information on utilizing the Power Delivery feature, refer to the application note “Power Delivery with Micro-

chip USB705x Hubs”, which can be found on the Microchip USB7252P product page at www.microchip.com/

USB7252P.

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.

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

pins. By default, the CC pins advertise a 3A VBUS sourcing capability when operating in DFP mode. This may be recon-

figured to 1.5A or Default USB (500mA for USB2 DFP or 900mA for a USB3 DFP) via OTP, SMBus, or SPI configuration.

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 3V-5V supply used to power circuitry in the USB Type-C plug that is required to implement Electronically

Marked Cables and other VCONN Powered accessories. By default the DFP always sources VCONN when connected

to an active cable. The USB7252P requires the use of two external VCONN FETs. The device provides the enables for

these FETs, and can detect an over-current event (OCS) by monitoring the output voltage of the FET via the CC pins.

If the voltage on the VCONN line is sensed as <3.0V by the CC comparator of the either CC1 or CC2 (whichever pin is

operating as VCONN at the time) then an over-current event is detected and the VCONN supply is shut off. VCONN is

only sourced on either the CC1 or the CC2 pin, never both. The pin which is to become the VCONN supply is determined

only when a device is attached to the Type-C port. The VCONN supply is controlled from the hub DP1_VCONN1/

DP1_VCONN2/DP2_VCONN2/DP2_VCONN2.

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 2.68V at the

VBUS_MON pin. For a DFP, the VBUS

comparator is useful to detect when VBUS is within the required 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 deter-

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

Note:

The USB7252P hub internally manages the protocol and policy for each USB Power Delivery port, and con-

trols external power circuitry via a companion UPD250 controller.

Note:

The USB7252P requires a serially-connected SPI Flash to contain the application-specific firmware, oth-

erwise 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 USB7252P.

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