USB7252SLASHKDX datasheet(41/65 Pages) MICROCHIP

41 / 65 page



2018 - 2020 Microchip Technology Inc.

DS00002736D-page 41

USB7252

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. 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.

8.4

PortSplit

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

arated. 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 embedded

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.

8.5

FlexConnect

The device allows the upstream port to be swapped with any downstream port, enabling any USB port to assume the

role of USB host at any time during hub operation. This host role exchange feature is called FlexConnect. Additionally,

the USB 2.0 ports can be flexed independently of the USB 3.2 ports.

This functionality can be used in two primary ways:

Host Swapping: This functionality can be achieved through a hub wherein a host and device can agree to swap

the host/device relationship; The host becomes a device, and the device becomes a host.

Host Sharing: A USB ecosystem can be shared between multiple hosts. Note that only 1 host may access to

the USB tree at a time.

FlexConnect can be enabled through any of the following three methods:

•

I2C Control: The embedded I2C slave can be used to control the state of the FlexConnect feature through basic

write/read operations.

•

USB Command: FlexConnect can be initiated via a special USB command directed to the hub’s internal Hub

Feature Controller device.

•

Direct Pin Control: Any available GPIO pin on the hub can be assigned the role of a FlexConnect control pin.

For detailed information on utilizing the FlexConnect feature, refer to the application note “USB720x/USB725x FlexCon-

nect Operation”, which can be found on the Microchip USB7252 product page at www.microchip.com/USB7252.

Note:

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

autonomously by the USB7252.

Note:

Direct Pin Control is only available in CFG_STRAP Mode 4 - GPIO/FlexConnect. Refer to Section 3.3.4,

PF[31:2] Configuration (CFG_STRAP[2:1]) for additional information.

USB7252/KDX 数据表(PDF) 41 Page - Microchip Technology

USB7252/KDX 数据表(HTML) 41 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65

数据表下载