USB3319 Standard Microsystems Corporation, USB3319 Datasheet - Page 4

• Manufacturer Part Number: USB3319
• Description: Hi-speed USB Transceiver with 1.8V ULPI Interface - 13mhz Reference Clock
• Manufacturer: Standard Microsystems Corporation

Hi-Speed USB Transceiver with 1.8V ULPI Interface - 13MHz Reference Clock
The USB3319 is designed to run with a 13MHz reference clock. By using a reference clock from the
Link the USB3319 is able to remove the cost of a crystal reference from the design.
The USB3319 includes a integrated 3.3V LDO regulator to generate its own supply from power applied
at the VBAT pin. The voltage on the VBAT pin can range from 3.1 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 3.1V. The USB transceiver will continue to operate at lower voltages, although some
parameters may be outside the limits of the USB specifications. If the user would like to provide a 3.3V
supply to the USB3319, the VBAT and VDD3.3 pins should be connected together.
The USB3319 also includes integrated pull-up resistors that can be used for detecting the attachment
of a USB Charger. By sensing the attachment to a USB Charger, a product using the USB3319 can
charge its battery at more than the 500mA allowed when charging from a USB Host.
The USB3319 also includes support for USB audio modes. The user can program the PHY into UART
or audio mode while in synchronous mode.
In USB UART mode, the USB3319 DP and DM pins are redefined to enable pass-through of
asynchronous serial data. The USB3319 can only enter UART mode when the user programs the part
into this mode.
In USB audio mode, the DP pin is shorted to the SPKR_R/M pin with a switch. The DM pin is shorted
to the SPKR_L pin. These switches are on when the RESETB pin of the USB3319 is asserted. Audio
signals may be transferred over the USB cable. In addition to audio signals, the switches can also be
used to connect Full Speed USB from another PHY onto the USB cable.
Revision 1.3 (11-02-07)
4
SMSC USB3319
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