USB2512I SMSC Corporation, USB2512I Datasheet - Page 8

• Manufacturer Part Number: USB2512I
• Description: Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller
• Manufacturer: SMSC Corporation

Chapter 3 Pin Descriptions
Revision 1.92 (11-28-07)
3.1
USBDN_DM[2:1]/
USBDN_DP[2:1]/
PRTPWR[2:1]
USBUP_DM
USBUP_DP
OCS[2:1]_N
VBUS_DET
SYMBOL
RBIAS
&
This section provides a detailed description of each signal. The signals are arranged in functional
groups according to their associated interface.
The “N” symbol in the signal name indicates that the active, or asserted, state occurs when the signal
is at a low voltage level. When “N” is not present before the signal name, the signal is asserted when
at the high voltage level.
The terms assertion and negation are used exclusively. This is done to avoid confusion when working
with a mixture of “active low” and “active high” signals. The term assert, or assertion, indicates that a
signal is active, independent of whether that level is represented by a high or low voltage. The term
negate, or negation, indicates that a signal is inactive.
PIN Descriptions
QFN-36
EMB
31
30
27
16
12
17
13
35
4
2
3
1
DOWNSTREAM 2-PORT USB 2.0 INTERFACE
Table 3.1 USB2512i Pin Descriptions
BUFFER
TYPE
I/O12
IO-U
IO-U
O12
IPU
I-R
UPSTREAM USB INTERFACES
DATASHEET
High-Speed USB Data
Over Current Sense
USB Transceiver Bias
USB Bus Data
These pins connect to the upstream USB bus data signals
(Host port, or upstream hub).
Detect Upstream VBUS Power
Detects state of Upstream VBUS power. The SMSC Hub
monitors VBUS_DET to determine when to assert the internal
D+ pull-up resistor (signaling a connect event).
When designing a detachable hub, this pin must be connected
to the VBUS power pin of the USB port that is upstream of the
hub.
For self-powered applications with a permanently attached
host, this pin must be connected to 3.3V (typically VDD33).
These pins connect to the downstream USB peripheral devices
attached to the hub’s port.
USB Power Enable
Enables power to USB peripheral devices downstream.
Note: The hub supports active high power controllers only!
Input from external current monitor indicating an over-current
condition.
{Note: Contains internal pull-up to 3.3V supply}
A 12.0k
to set the transceiver’s internal bias settings.
Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller
8
Ω
(+/- 1%) resistor is attached from ground to this pin
DESCRIPTION
SMSC USB2512i
Datasheet