UCS1002-2 datasheet(55/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

Note 7.1

Any time the charge rationing circuitry checks the pin conditions when changing rationing

behavior or resetting charge rationing, if the external pin conditions have changed, then

charger emulation will be restarted (provided emulation is enabled via the pin states). If

the pin conditions have not changed, the UCS1002 return to the previous power state as

if the rationing threshold had not been reached (e.g., it will not discharge VBUS or restart

emulation).

7.5.1

Charge Rationing Interactions

When charge rationing is active, regardless of the specified behavior, the UCS1002 will function

normally until the charge rationing threshold is reached. Note that charge rationing is only active when

the UCS1002 is in the Active state, and it does not automatically reset when a Removal or Attach

Detection event occurs. Charger emulation will start over if a Removal Detection event and Attach

Detection event occur while charge rationing is active and the charge rationing threshold has not been

reached. This allows charging of sequential portable devices while charge is being rationed, which

means that the accumulated power given to several portable devices will still be held to the stated

rationing limit.

Changing the charge rationing behavior will have no effect on the charge rationing data registers. If

the behavior is changed prior to reaching the charge rationing threshold, this change will occur and be

transparent to the user. When the charge rationing threshold is reached, the UCS1002 will take action

as shown in Table 7.1. If the behavior is changed after the charge rationing threshold has been

reached, the UCS1002 will immediately adopt the newly programmed behavior, clearing the ALERT#

pin and restoring switch operation respectively (see Table 7.3).

Table 7.3 Effects of Changing Rationing Behavior after Threshold Reached

BEHAVIOR

NEW BEHAVIOR

ACTIONS TAKEN

Ignore

Report

Assert ALERT# pin.

Report and

Disconnect

1. Assert ALERT# pin.

2. Remove charger emulation profile.

3. Open port power switch. See the “Report and Disconnect” entry in

Table 7.1.

Disconnect and

go to Sleep

1. Remove charger emulation profile.

2. Open port power switch.

3. Enter the Sleep state. See the “Disconnect and go to Sleep” entry in

Table 7.1.

Report

Ignore

Release ALERT# pin.

Report and

Disconnect

Open port power switch. See the “Report and Disconnect” entry in Table 7.1.

Disconnect and

go to Sleep

1. Release the ALERT# pin.

2. Remove charger emulation profile.

3. Open the port power switch.

4. Enter the Sleep state. See the “Disconnect and go to Sleep” entry in

Table 7.1.

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