USB3803 datasheet(5/99 Pages) MICROCHIP

5 / 99 page

 2014-2015 Microchip Technology Inc.

DS00001691B-page 5

USB3803

VariSense

which controls the USB receiver sensitivity enabling programmable levels of USB signal receive sensitivity.

This capability allows operation in a sub-optimal system environment, such as when a captive USB cable is used.

1.1

Customer Selectable Features

A default configuration is available in the USB3803 following a reset. This configuration may be sufficient for most appli-

cations. The USB3803 hub may also be configured by an external microcontroller. When using the microcontroller inter-

face, the hub appears as an I2C slave device.

The USB3803 hub supports customer selectable features including:

• Optional customer configuration via I2C.

• Supports compound devices on a port-by-port basis.

• Customizable vendor ID, product ID, and device ID.

• Configurable downstream port power-on time reported to the host.

• Supports indication of the maximum current that the hub consumes from the USB upstream port.

• Supports Indication of the maximum current required for the hub controller.

• Configurable as a Self-Powered and Bus-Powered Hub

• Supports custom string descriptors (up to 30 characters):

- Product string

- Manufacturer string

- Serial number string

• When available, I2C configurable options for default configuration may include:

- Downstream ports as non-removable ports

- Downstream ports as disabled ports

- USB signal drive strength

- USB receiver sensitivity

- USB differential pair pin location

USB3803 Datasheet(PDF) 5 Page - Microchip Technology