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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

5.1

UCS1002 Power States

The UCS1002 has the following power states.



Off - This power state is entered when the voltage at the VDD pin voltage is < VDD_TH. In this state

the device is considered “off”. The UCS1002 will not retain its digital statesand register contents

nor respond to SMBus / I2C communications. The port power switch, bypass switch, and the high-

speed data switches will be off. See Section 5.1.1, "Off State Operation".



Sleep - This is the lowest power state available. While in this state, the UCS1002 willretain digital

functionality, respond to changes in emulation controls, and wake to respond to SMBus / I2C

communications. The high-speed switch and all other functionality will be disabled. See Section

5.1.2, "Sleep State Operation".



Detect - This is a lower current power state. In this state, the device is actively looking for a

portable device to be attached. The high-speed switch is disabledby default.While in this state, the

UCS1002 will retain the configuration and charge rationing data, but it will not monitor the bus

current. SMBus / I2C communications will be fully functional. See Section 5.1.3, "Detect State

Operation".



Error - This power state is entered when a fault condition exists. See Section 5.1.5, "Error State

Operation".



Active - This power state provides full functionality. While in this state, operations include activation

of the port power switch, USB data line handshaking / charger emulation, current limiting, and

charge rationing. See Section 5.1.4, "Active State Operation".

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