USB2533 datasheet(27/61 Pages) SMSC

27 / 61 page

USB 2.0 Hi-Speed 3-Port Hub Controller

Datasheet

SMSC USB2533

Revision 1.0 (06-17-13)

DATASHEET

6.2.1

USB Accessible Functions

6.2.1.1

VSM commands over USB

By default, Vendor Specific Messaging (VSM) commands to the hub are enabled. The supported

commands are:



Enable Embedded Controller



Disable Embedded Controller



Enable Special Resume



Disable Special Resume



Reset Hub

6.2.1.2

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:



Enable I2C pass through mode



Disable I2C pass through mode



I2C write



I2C read



Send I2C start



Send I2C stop

6.2.1.3

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:



Enable OTP reset



Set OTP operating mode



Set OTP read mode



Program OTP



Get OTP status



Program OTP control parameters

6.2.1.4

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:



Enable/Disable battery charging



Upstream battery charging mode control



Downstream battery charging mode control



Battery charging timing parameters



Download custom battery charging algorithm

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