USB3300 datasheet(35/53 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS00001783B-page 35

USB3300

For Host Applications the USB3300 implements the ULPI AutoResume bit in the Interface Control register. The default

AutoResume

state is 0 and this bit should be enabled for Host applications. For more details please see sections 7.1.77

and 7.9 of the USB specification.

6.4

Internal Regulators and POR

The USB3300 includes an integrated set of built in power management functions, including a POR generator. Internal

regulators enable the USB3300 to be powered from a single 3.3 volt power supply, thereby reducing the bill of materials

and simplifying product design.

6.4.1

INTERNAL REGULATORS

The USB3300 has two internal regulators that create two 1.8V outputs (labeled VDD1.8 and VDDA1.8) from the 3.3volt

power supply input (VDD3.3). Each regulator requires an external 4.7uF +/-20% low ESR bypass capacitor to ensure

stability. X5R or X7R ceramic capacitors are recommended since they exhibit an ESR lower that 0.1ohm at frequencies

greater than 10kHz.

6.4.2

POWER ON RESET (POR)

The USB3300 provides an internal POR circuit that generates a reset pulse once the PHY supplies are stable. This reset

will set all of the ULPI registers to their default values and start the PHY in normal operation. Cycling the 3.3 volt power

supply is the only method for the PHY to reset the ULPI registers to their default states. The Link can write the registers

to their default states at any time in normal operation.

The RESET pin has the same functionality as the RESET register in the Function Control Register.

6.5

USB On-The-Go (OTG) Module

The USB3300 provides support for USB OTG. OTG allows the USB3300 to be dynamically configured as a host or a

device depending on the type of cable inserted into the Mini-AB connector. When the Mini-A plug of a cable is inserted

into the Mini-AB connector, the USB device becomes the A-device. When a Mini-B plug is inserted, the device becomes

the B-device. The OTG A-device behaves similar to a Host while the B-device behaves similar to a peripheral. The dif-

ferences are covered in the OTG supplement.

The OTG Module meets all the requirements in the “On-The-Go Supplement to the USB 2.0 Specification”. In applica-

tions where only Host or Device is required, the OTG Module is unused.

Note:

The specific capacitor recommendations for each pin are detailed in Table 3-1, "USB3300 Pin Definitions

32-Pin QFN Package", and shown in FIGURE 7-1: USB3300 Application Diagram (Peripheral) on page 40.

The USB3300 regulators are designed to generate a 1.8 volt supply for the USB3300 only. Using the reg-

ulators to provide current for other circuits is not recommended and Microchip does not guarantee USB

performance or regulator stability.

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