UCS1002-2 datasheet(54/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

Table 7.1 Charge Rationing Behavior

RATION_BEH

[1:0]

BEHAVIOR

ACTIONS TAKEN

NOTES

Report

ALERT# pin asserted.

Report and

Disconnect

(default)

1. ALERT# pin asserted.

2. Charger emulation

profile removed.

3. Port power switch

disconnected.

The HSW will not be affected.

All bus monitoring is still active.

Changing the M1, M2, EM_EN, S0, and

PWR_EN controls will cause the device to

change power states as defined by the pin

combinations; however, the port power

switch will remain off until the rationing

circuitry is reset. Furthermore, the bypass

switch will not be turned on if enabled via

the S0 control.

Disconnect and go

to Sleep

1. Port power switch

disconnected.

2. Charger emulation

profile removed.

3. Device will enter the

Sleep state.

The HSW will be disabled.

All VBUS and VS monitoring will be

stopped.

Changing the M1, M2, EM_EN, S0, and

PWR_EN controls will have no effect on the

power state until the rationing circuitry is

reset.

Ignore

Take no further action.

Table 7.2 Charge Rationing Reset Behavior

BEHAVIOR

RESET ACTIONS

Report

1. Reset the Total Accumulated Charge registers.

2. Clear the RATION status bit.

3. Release the ALERT# pin.

Report and Disconnect

1. Reset the Total Accumulated Charge registers.

2. Clear the RATION status bit.

3. Release the ALERT# pin.

4. Check the M1, M2, EM_EN, S0, and PWR_EN controls and enter the indicated

power state if the controls changed (see Note 7.1).

Disconnect and go to

Sleep

1. Reset the Total Accumulated Charge registers.

2. Clear the RATION status bit.

3. Check the M1, M2, EM_EN, S0, and PWR_EN controls and enter the indicated

power state if the controls changed (see Note 7.1).

Ignore

1. Reset the Total Accumulated Charge registers.

2. Clear the RATION status bit.

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