UCS1001 datasheet(31/59 Pages) MICROCHIP

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USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1001

Revision 1.2 (05-21-12)

DATASHEET

4.1.5

Error State Operation

The UCS1001 will enter the Error state from the Active state when any of the following events are

detected:

1. The maximum allowable internal die temperature (TTSD) has been exceeded (see Section 6.3.1.2).

2. An over-current condition has been detected (see Section 6.2.1).

3. An under-voltage condition on VBUS has been detected (see Section 4.2.5).

4. A back-drive condition has been detected (see Section 4.2.3).

5. A discharge error has been detected (see Section 6.4).

6. An over-voltage condition on the VS pins.

The UCS1001 will enter the Error state from the Detect state when a back-drive condition has been

detected or when the maximum allowable internal die temperature has been exceeded.

The UCS1001 will enter the Error state from the Sleep state when a back-drive condition has been

detected.

When the UCS1001 enters the Error state, the port power switch, the VBUS bypass switch, the high-

speed switch are turned off, and the ALERT# pin is asserted. They will remain off while in this power

state. The UCS1001 will leave this state as determined by the fault handling selection (see Section

6.5, "Fault Handling Mechanism").

When using the Latch fault handler and the user has re-activated the device by or toggling the

PWR_EN control, the UCS1001 will check that all of the error conditions have been removed. If using

Auto-recovery fault handler, after the tCYCLE time period, the UCS1001 will check that all of the error

conditions have been removed.

If all of the error conditions have been removed, the UCS1001 will return to the Active state or Detect

state, as applicable. Returning to the Active state will cause the UCS1001 to restart the selected mode

(see Section 8.2, "Active Mode Selection").

If the device is in the Error state and a Removal Detection event occurs, it will check the error

conditions and then return to the power state defined by the PWR_EN, M1, M2, EM_EN, and S0

controls.

4.2

Supply Voltages

4.2.1

VDD Supply Voltage

The UCS1001 requires 4.5 V to 5.5 V present on the VDD pin for core device functionality.

4.2.2

VS Source Voltage

VS can be a separate supply and can be greater than VDD to accommodate high current applications

in which current path resistances result in unacceptable voltage drops that may prevent optimal

charging of some portable devices.

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