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
I2C/SMBUS INTERFACE
I2C Serial
SCL
I_SMB
I2C serial clock input.
Clock Input
1
1
SMBus Clock
SMBCLK
SDA
I_SMB
IS/OD8
SMBus serial clock input.
I2C Serial
Data
I2C bidirectional serial data.
SMBus Serial
Data
SMBDATA
IS/OD8
SMBus bidirectional serial data.
SPI MASTER INTERFACE
SPI Chip
Enable
Output
SPI_CE_N
O12
Active-low SPI chip enable output.
1
1
Note:
If the SPI is enabled, this pin will be
driven high in powerdown states.
SPI Clock
Output
SPI_CLK
SPI_DO
O12
O12
SPI clock output
SPI Data
Output
SPI data output
SPI Speed
Select
Configuration
Strap
SPI_SPD_SEL
IS
(PD)
This strap is used to select the speed of the SPI.
0 = 30MHz (default)
1 = 60MHz
1
Note:
If the latched value on reset is 1, this pin
is tri-stated when the chip is in the
suspend state. If the latched value on
reset is 0, this pin is driven low during a
suspend state.
See Note 3.2 for more information on
configuration straps.
SPI Data
Input
SPI_DI
IS
(PD)
SPI data input
1
MISC.
Reference
Clock Input
REFCLK
ICLK
This signal is the reference clock input. The clock
input frequency is configured via REFSEL[1:0].
Refer to Section 8.4, "Reference Clock," on
page 54 for additional information.
1
1
Reference
Clock Select
0 Input
REFSEL0
IS
This signal, combined with REFSEL1, selects the
reference clock input frequency. The reference
select input must be set to correspond to the
frequency applied to the REFCLK input. Refer to
Section 8.4, "Reference Clock," on page 54 for
additional information.
Revision 1.0 (06-17-13)
12
SMSC USB3813
DATASHEET
SMSC [ SMSC CORPORATION ]
