UCS1002-2 datasheet(56/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

If the RATION_EN control is set to ‘0’ prior to reaching the charge rationing threshold, rationing will be

disabled and the Total Accumulated Charge registers will be cleared. If the RATION_EN control is set

to ‘0’ after the charge rationing threshold has been reached, the following will be done:

1. RATION status bit will be cleared.

2. The ALERT# pin will be released if asserted by the rationing circuitry and no other conditions are

present.

3. The M1, M2, EM_EN, S0, and PWR_EN controls are checked to determine the power state. See

Note 7.1.

APPLICATION NOTE: If the rationing behavior was set to “Report and Disconnect” when the charge rationing

threshold was reached and then the RATION_EN bit is cleared, the portable device may start

charging suboptimally because the charger emulation profile has been removed. Toggle the

PWR_EN control to restart charger emulation.

Setting the RATION_RST control to ‘1’ will automatically reset the Total Accumulated Charge registers

to 00_00h. If this is done prior to reaching the charge rationing threshold, the data will continue to be

accumulated restarting from 00_00h. If this is done after the charge rationing threshold is reached, the

UCS1002 will take action as shown in Table 7.2.

7.6

Fault Handling Mechanism

The UCS1002 has two modes for handling faults: Latch (latch-upon-fault) or Auto-recovery

(automatically attempt to restore the Active power state after a fault occurs). If the SMBus is actively

utilized, auto-recovery fault handling is the default error handler as determined by the LATCH_SET bit

(see Section 10.4.3, "Switch Configuration - 17h"). Otherwise, the fault handling mechanism used

depends on the state of the LATCH pin. Faults include over-current, over-voltage (on VS), under-

Report and

Disconnect

Ignore

1. Release the ALERT# pin.

2. 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).

Report

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. Release the ALERT# pin.

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

Table 7.1.

Disconnect

and go to

Sleep

Ignore

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).

Report

1. Assert the ALERT# pin.

2. 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).

Report and

Disconnect

1. Assert the ALERT# pin.

2. Check the M1, M2, EM_EN, S0, and PWR_EN controls to determine the

power state then enter that state except that the port power switch and

bypass switch will not be closed (see Note 7.1).

Table 7.3 Effects of Changing Rationing Behavior after Threshold Reached (continued)

BEHAVIOR

NEW BEHAVIOR

ACTIONS TAKEN

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