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| USB2533 Datasheet, PDF (27/50 Pages) SMSC Corporation – USB 2.0 Hi-Speed 3-Port Hub Controller | |||
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USB 2.0 Hi-Speed 3-Port Hub Controller
Datasheet
6.2.1
6.2.1.1
6.2.1.2
6.2.1.3
6.2.1.4
USB Accessible Functions
VSM commands over USB
By default, Vendor Specific Messaging (VSM) commands to the hub are enabled. The supported
commands are:
ï® Enable Embedded Controller
ï® Disable Embedded Controller
ï® Enable Special Resume
ï® Disable Special Resume
ï® Reset Hub
I2C Master Access over USB
Access to I2C devices is performed as a pass-through operation from the USB Host. The device
firmware has no knowledge of the operation of the attached I2C device. The supported commands are:
ï® Enable I2C pass through mode
ï® Disable I2C pass through mode
ï® I2C write
ï® I2C read
ï® Send I2C start
ï® Send I2C stop
OTP Access over USB
The OTP ROM in the device is accessible via the USB bus. All OTP parameters can modified via the
USB Host. The OTP operates in Single Ended mode. The supported commands are:
ï® Enable OTP reset
ï® Set OTP operating mode
ï® Set OTP read mode
ï® Program OTP
ï® Get OTP status
ï® Program OTP control parameters
Battery Charging Access over USB
The Battery charging behavior of the device can be dynamically changed by the USB Host when
something other than the preprogrammed or OTP programmed behavior is desired. The supported
commands are:
ï® Enable/Disable battery charging
ï® Upstream battery charging mode control
ï® Downstream battery charging mode control
ï® Battery charging timing parameters
ï® Download custom battery charging algorithm
ï£ 2014 Microchip Technology Inc.
DS00001702A-page 27
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