Appendix A: Data Sheet Revision History ........................................................................................................................................... 71
The Microchip Web Site ...................................................................................................................................................................... 72
Customer Change Notification Service ............................................................................................................................................... 72
Customer Support ............................................................................................................................................................................... 72
Product Identification System ............................................................................................................................................................. 73
2012 - 2015 Microchip Technology Inc.
DS00001915B-page 3
USB3370
1.0
INTRODUCTION
Microchip’s USB3370 is a family of Hi-Speed USB 2.0 Transceivers that provide a physical layer (PHY) solution well-
suited for portable electronic devices. Both commercial and industrial temperature applications are supported.
Several advanced features make the USB3370 the transceiver of choice by reducing both eBOM part count and printed
circuit board (PCB) area. Outstanding ESD robustness eliminates the need for external ESD protection devices in typ-
ical applications. The internal Over-Voltage Protection circuit (OVP) protects the USB3370 from voltages up to 30V on
the
VBUS
pin. By using a reference clock from the Link, the USB3370 removes the cost of a dedicated crystal reference
from the design. The USB3370 includes integrated 3.3V and 1.8V regulators, making it possible to operate the device
from a single power supply.
The USB3370 is optimized for use in portable applications where a low operating current and standby currents are
essential. The USB3370 operates from a single supply and includes integrated regulators for its supplies. The USB3370
also supports the USB Link Power Management protocol (LPM) to further reduce USB operating currents.
The USB3370 also includes family is enabled with Microchip's RapidCharge Anywhere
TM
which supports USB-IF Bat-
tery Charging 1.1 for any portable device. RapidCharge Anywhere
TM
provides three times the charging current through
a USB port over traditional solutions which translate up to 1.5Amps via compatible USB host or dedicated charger. In
addition, this provides a complete USB charging ecosystem between device and host ports such as Dedicated Charging
Port (DCP), Charging (CDP) and Standard (SDP) Downstream Ports.
Section 5.9
describes this is further detail.
The USB3370 meets all of the electrical requirements for a Hi-Speed USB Host, Device, or an On-the-Go (OTG) trans-
ceiver. In addition to the supporting USB signaling, the USB3370 also provides USB UART mode.
USB3370 uses the industry standard UTMI+ Low Pin Interface (ULPI) to connect the USB transceiver to the Link. ULPI
uses a method of in-band signaling and status byte transfers between the Link and PHY to facilitate a USB session with
only twelve pins.
The USB3370 uses Microchip’s “wrapper-less” technology to implement the ULPI interface. This “wrapper-less” tech-
nology allows the PHY to achieve a low latency transmit and receive time. Microchip’s low latency transceiver allows an
existing UTMI Link to be reused by adding a UTMI to ULPI bridge. By adding a bridge to the ASIC the existing and
proven UTMI Link IP can be reused.
DS00001915B-page 4
2012 - 2015 Microchip Technology Inc.
USB3370
FIGURE 1-1:
BLOCK DIAGRAM USB3370
REFCLK / XI
EXTVBUS
CPEN_N
VBUS
ID
OVP
ESD Protection
OTG
Low Jitter
Integrated
PLL
XO
BIAS
RBIAS
DP
DM
BC 1.1
Hi-Speed
USB
Transceiver
ULPI
Registers
and State
Machine
Integrated
Power
Management
RESETB
VBAT
VDD33
VDD18
VDDIO
ULPI
Interface
STP
NXT
DIR
CLKOUT
DATA[7:0]
The USB3370 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 USB3370
DP
and
DM
pins are redefined to enable pass-through of asynchronous serial data.
The USB3370 will enter UART mode when programmed, as described in
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