Specification
NET2272 USB Peripheral Controller
______________________________________________________________________________
NetChip Technology, Inc., 2003
Patent Pending
335 Pioneer Way, Mountain View, California 94041
TEL (650) 526-1490
FAX (650) 526-1494
http://www.netchip.com
Rev 1.2, October 15, 2003
16
2.2
USB Transceiver (15 pins)
Signal Name
Pin
Type
Description
DP
6
I/O
High Speed USB Positive Data Port.
DP is the high speed positive differential data signal of the USB data port.
It also acts as the full speed positive differential input data port. This pin
connects directly to the USB connector.
DM
8
I/O
High Speed USB Negative Data Port.
DM is the high speed negative differential data signal of the USB data
port. It also acts as the full speed negative differential input data port.
This pin connects directly to the USB connector.
RSDP
5
O
Full Speed USB Positive Output Data Port.
RSDP is the full speed positive differential output data signal of the USB
data port. This pin connects through a 39.2 ohm +/- 1% resistor to the
USB connector.
RSDM
9
O
Full Speed USB Negative Output Data Port.
RSDM is the full speed negative differential output data signal of the USB
data port. This pin connects through a 39.2 ohm +/- 1% resistor to the
USB connector.
RPU
2
O
DP Pull Up Resistor. Connect to DP pin through a 1.5K resistor.
RREF
13
I
Reference Resistor. Connect 2.43K +/- 1% resistor to analog ground.
The typical voltage on this pin is 1.27 volts.
VDD25
3
Power
Supply Voltage. Connect to digital 2.5 V.
VDD33
7
Power
Supply Voltage. Connect to digital 3.3 V.
PVDD
11
Power
PLL Supply Voltage. Connect to analog 2.5 V.
AVDD
15
Power
Analog Supply Voltage. Connect to analog 2.5 V.
GND
4,10
Ground
Digital Ground. Connect to ground.
AVSS
12, 14
Ground
Analog Ground. Connect to analog ground.
COM (AVSS)
16
Ground
PLL Ground. Connect to analog ground.
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