USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications
Datasheet
Table 3.1 Ball Descriptions (continued)
NUM
BALLS
BUFFER
TYPE
NAME
SYMBOL
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 8.7, "Suspend (SUSPEND)," on page 55
for additional information.
Note:
SUSPEND must be enabled via the
Protouch configuration tool.
1
Interrupt
Request Input
IRQ_N
INT_N
IS
This active-low signal allows external hardware to
interrupt the device. Refer to Section 8.8,
"Interrupt Requests (IRQ_N)," on page 56 for
additional information.
Interrupt
Output
OD8
This active-low signal allows the device to output
an interrupt to external hardware. Refer to
Section 8.9, "Interrupt Output (INT_N)," on
page 56 for additional information.
USB Port
Control
PRTCTLA
OD8/IS
(PU)
This pin functions as both the downstream USB
port power enable output (PRTPWRA) and the
downstream USB port over-current sense input
(OCSA_N).
1
POWER
Battery
Power Supply
Input
VBAT
P
Battery power supply input. When VBAT is
connected directly to a +3.3V supply from the
system, the internal +3.3V regulator runs in
dropout and regulator power consumption is
eliminated. A 4.7 μF (<1 Ω ESR) capacitor to
ground is required for regulator stability. The
capacitor should be placed as close as possible
to the device. Refer to Chapter 4, "Power
Connections," on page 17 for power connection
information.
1
+3.3V Power
Supply
VDD33
P
P
+3.3V power supply. A 1.0 μF (<1 Ω ESR)
capacitor to ground is required for regulator
stability. The capacitor should be placed as close
as possible to the device. Refer to Chapter 4,
"Power Connections," on page 17 for power
connection information.
1
1
1
+1.8-3.3V
Core Power
Supply Input
VDDCOREREG
+1.8-3.3V core power supply input to internal
+1.2V regulator. This pin may be connected to
VDD33 for single supply applications when VBAT
equals +3.3V. Running in a dual supply
configuration with VDDCOREREG at a lower
voltage, such as +1.8V, may reduce overall
system power consumption. Refer to Chapter 4,
"Power Connections," on page 17 for power
connection information.
+1.2V Core
Power Supply
VDDCR12
P
+1.2V core power supply. A 1.0 μF (<1 Ω ESR)
capacitor to ground is required for regulator
stability. The capacitor should be placed as close
as possible to the device. Refer to Chapter 4,
"Power Connections," on page 17 for power
connection information.
Revision 1.0 (06-17-13)
14
SMSC USB3813
DATASHEET
SMSC [ SMSC CORPORATION ]
