USB334X datasheet(6/92 Pages) MICROCHIP

6 / 92 page

USB334x

DS00002646A-page 6

 2009-2018 Microchip Technology Inc.

The USB334x includes an integrated 3.3V LDO regulator that is used to generate 3.3V from power applied to the VBAT

pin. The voltage on the VBAT pin can range from 3.0 to 5.5V. The regulator dropout voltage is less than 100mV which

allows the PHY to continue USB signaling when the voltage on VBAT drops to 3.0V. The USB transceiver will continue

to operate at lower voltages, although some parameters may be outside the limits of the USB specifications. The VBAT

and VDD33 pins should never be connected together.

In USB UART mode, the USB334x DP and DM pins are redefined to enable pass-through of asynchronous serial data.

The USB334x will enter UART mode when programmed, as described in Section 6.7.1, "Entering USB UART Mode,"

on page 60.

1.1

Reference Documents

UTMI+ Low Pin Interface (ULPI) Specification, Revision 1.1

Universal Serial Bus Specification, Revision 2.0

On-The-Go Supplement to the USB 2.0 Specification, Revision 1.3

On-The-Go Supplement to the USB 2.0 Specification, Revision 2.0

USB Battery Charging Specification, Revision 1.2

FIGURE 1-2:

BLOCK DIAGRAM (USB3343)

OTG

Hi-Speed

USB

Transceiver

ULPI

Interface

ULPI

Registers

and State

Machine

BIAS

Low Jitter

Integrated

PLL

Integrated

Power

Management

VBUS

RBIAS

DATA[7:0]

RESETB

VDD18

VDD33

VBAT

DIR

NXT

STP

CLKOUT

OVP

VDDIO

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