Datasheet

2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Revision 1.3 (12-27-11) 8 SMSC USB2412
DATASHEET
Chapter 2 Pin Descriptions
This chapter is organized by a set of pin configurations followed by a corresponding pin list organized
by function according to their associated interface. A detailed description list of each signal (named in
the pin list) is organized by function in Table 2.2, “USB2412 Pin Descriptions,” on page 10. Refer to
Table 2.3, “Buffer Type Descriptions,” on page 12 for a list of buffer types.
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 after the signal name, the signal is asserted when it
is 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.
2.1 Pin Configuration
Figure 2.1 USB2412 28-Pin QFN
Ground Pad
(must be connected to VSS)
SMSC
USB2412
(Top View QFN-28)
XTALOUT
23
XTALIN/CLKIN
24
USBDP_UP
22
PLLFILT
25
RBIAS
26
USBDM_DN1
28
VDD33
27
NC
1
USBDP_DN1
2
USBDM_DN2
3
USBDP_DN2
4
VDD33
5
TEST
6
PRTPWR1
7
14
VDD33
13
NON_REM1
12
VDD33
11
OCS_N2
10
PRTPWR2
9
CRFILT
8
OCS_N1
21
USBDM_UP
20
VDD33
19
SUSP_IND/NON_REM0
18
VBUS_DET
17
RESET_N
16
HS_IND
15
TEST1
Indicates pins on the bottom of the device.