USB2660 Standard Microsystems Corp., USB2660 Datasheet - Page 19

• Manufacturer Part Number: USB2660
• Description: Ultra Fast Usb 2.0 Hub And Multi-format Flash Media Controller With Dual Sd Interfaces
• Manufacturer: Standard Microsystems Corp.

Ultra Fast USB 2.0 Hub and Multi-Format Flash Media Controller with Dual SD Interfaces
Datasheet
SMSC USB2660/USB2660i
XTAL1 (CLKIN)
PRTCTL[3:2]
USBDN_DM
USBUP_DM
USBDN_DP
USBUP_DP
VBUS_DET
SPI_CE_n
SYMBOL
RBIAS
XTAL2
[3:2]
[3:2]
64-PIN
QFN
59
58
55
63
61
60
49
3
1
4
2
7
6
Table 6.1 USB2660/USB2660i Pin Descriptions (continued)
(Table
BUFFER
OCLKx
ICLKx
TYPE
I/OD6
I/O-U
I/O-U
O12
PU
I-R
I
6.2)
DESCRIPTION
USB Bus Data
These pins connect to the upstream USB bus data signals (host port
or upstream hub). USBUP_DM and USBUP_DP can be swapped
using the PortSwap feature (See
on page
USB Bus Data
These pins connect to the downstream USB bus data signals and can
be swapped using the PortSwap feature (See
Port Swap," on page
USB Power Enable
As an output, these pins enable power to downstream USB peripheral
devices and have weak internal pull-up resistors. See
"Port Power Control"
As an input, when the power is enabled, these pins monitor the over-
current condition. When an over-current condition is detected, the pins
turn the power off.
Detect Upstream VBUS Power
Detects the state of upstream VBUS power. The hub monitors
VBUS_DET to determine when to assert the internal D+ pull-up resistor
(signaling a connect event).
When designing a detachable hub, connect this pin 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 should be pulled up, typically to VDD33.
VBUS is a 3.3 volt input. A resistor divider must be used if connecting
to 5 volts of USB power.
USB Transceiver Bias
A 12.0 k
set the transceiver's internal bias currents.
24 MHz Crystal Input or External Clock Input
This pin can be connected to one terminal of the crystal or it can be
connected to an external 24 MHz clock when a crystal is not used.
24 MHz Crystal Output
This is the other terminal of the crystal, or it is left open when an
external clock source is used to drive XTAL1(CLKIN).
SPI Chip Enable
This is the active low chip enable output. If the SPI interface is
enabled, this pin must be driven high in power down states.
USB INTERFACE
SPI INTERFACE
DATASHEET
Ω
48).
,
±
19
1.0% resistor is attached from VSS to this pin in order to
48).
for diagram and usage instructions.
Section 8.4.4.20, "F1h: Port Swap,"
Section 8.4.4.20, "F1h:
Revision 1.0 (06-09-09)
Section 6.3,