USB3813 Datasheet, PDF (35/57 Pages) SMSC Corporation – USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications

USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications
Datasheet
7.2.2
7.3
Pull-Up Resistors for I²C
The circuit board designer is required to place external pull-up resistors (10 kΩ recommended) on the
SDA & SCL signals (per SMBus 1.0 Specification) to Vcc in order to assure proper operation.
SMBus Slave Interface
The USB3813 includes an integrated SMBus slave interface, which can be used to access internal
device run time registers or program the internal OTP memory. SMBus detection is accomplished by
detection of pull-up resistors (10 KΩ recommended) on both the SMBDATA and SMBCLK signals. To
disable the SMBus, a pull-down resistor of 10 KΩ must be applied to SMBDATA. The SMBus interface
can be used to configure the device as detailed in Section 6.1, "Configuration Method Selection," on
page 24.
Note: All device configuration must be performed via the Pro-Touch Programming Tool. For additional
information on the Pro-Touch programming tool, contact your local Microchip sales
representative.
 2014 Microchip Technology Inc.
DS00001715A-page 35