USB 2.0 HSIC Hi-Speed 4-Port Hub Controller
Datasheet
Table 3.1 Pin Descriptions (continued)
BUFFER
NUM PINS
NAME
SYMBOL
TYPE
DESCRIPTION
Suspend
Output
SUSPEND
PU
This signal is used to indicate that the entire hub
has entered the USB suspend state and that
VBUS current consumption should be reduced in
accordance with the USB specification. Refer to
Section 8.6, "Suspend (SUSPEND)," on page 57
for additional information.
1
Note:
SUSPEND must be enabled via the
Protouch configuration tool.
SOF
SOF
O8
IS
This signal outputs an 8KHz clock synchronized
with the USB Host SOF.
Synchronized
8KHz Clock
Output
1
Note:
SOF output is controlled via the
SOF_ENABLE bit in the
UTIL_CONFIG1 register
Detect
VBUS_DET
Detects state of upstream bus power.
Upstream
VBUS Power
When designing a detachable hub, this pin must
be connected to the VBUS power pin of the
upstream USB port through a resistor divider
(50kΩ by 100kΩ) to provide 3.3V.
For self-powered applications with a permanently
attached host, this pin must be connected to
either 3.3V or 5.0V through a resistor divider to
provide 3.3V.
1
In embedded applications, VBUS_DET may be
controlled (toggled) when the host desires to
renegotiate a connection without requiring a full
reset of the device.
Port 1 Power
Output
PRTPWR1
PRTCTL1
PRTPWR2
PRTCTL2
O8
Enables power to a downstream USB device
attached to Port 1.
0 = Power disabled on downstream Port 1
1 = Power enabled on downstream Port 1
1
Port 1 Control
OD8/IS
(PU)
When configured as PRTCTL1, this pin functions
as both the Port 1 power enable output
(PRTPWR1) and the Port 1 over-current sense
input (OCS1_N). Refer to the PRTPWR1 and
OCS1_N descriptions for additional information.
Port 2 Power
Output
O8
Enables power to a downstream USB device
attached to Port 2.
0 = Power disabled on downstream Port 2
1 = Power enabled on downstream Port 2
1
Port 2 Control
OD8/IS
(PU)
When configured as PRTCTL2, this pin functions
as both the Port 2 power enable output
(PRTPWR2) and the Port 2 over-current sense
input (OCS2_N). Refer to the PRTPWR2 and
OCS2_N descriptions for additional information.
SMSC USB4604
17
Revision 1.0 (06-17-13)
DATASHEET
SMSC [ SMSC CORPORATION ]
