UCS1002-3 datasheet(37/114 Pages) MICROCHIP

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DS20006852A-page 37

UCS1002-3

If the RATION_EN control is set to ‘0’ prior to reaching

the charge rationing threshold, rationing is disabled

and the Total Accumulated Charge registers are

cleared. If the RATION_EN control is set to ‘0’ after the

charge rationing threshold is reached, the following are

done:

RATION status bit is cleared.

The ALERT# pin is released if asserted by the

rationing circuitry and no other conditions are

present.

The M1, M2, EM_EN, S0 and PWR_EN controls

are checked to determine the power state. See

Note 1 in Table 7-3.

Setting the RATION_RST control to ‘1’ automatically

resets the Total Accumulated Charge registers to

00_00h. If this is done prior to reaching the charge

rationing threshold, the data continues to be

accumulated restarting from 00_00h. If this is done

after the charge rationing threshold is reached, the

UCS1002-3 takes action as shown in Table 7-2.

Report

Ignore

Release ALERT# pin.

Report and Disconnect

Open port power switch. See the Report and Disconnect (default)

entry in Table 7-1.

Disconnect and Go to Sleep

Release the ALERT# pin.

Remove charger emulation profile.

Open the port power switch.

Enter the Sleep state. See the Disconnect and Go to Sleep

entry in Table 7-1.

Report and

Disconnect

Ignore

Release the ALERT# pin.

Check the M1, M2, EM_EN, S0, and PWR_EN controls and

enter the indicated power state if the controls changed (see

Note 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 1).

Disconnect and Go to Sleep

Release the ALERT# pin.

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 1).

Report

Assert the ALERT# pin.

Check the M1, M2, EM_EN, S0, and PWR_EN controls and

enter the indicated power state if the controls changed (see

Note 1).

Report and Disconnect

Assert the ALERT# pin.

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 are not closed (see

Note 1).

TABLE 7-3:

EFFECTS OF CHANGING RATIONING BEHAVIOR AFTER THRESHOLD REACHED

Behavior

New Behavior

Actions taken

Note 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 is restarted

(provided emulation is enabled via the pin states). If the pin conditions did not change, the UCS1002-3

returns to the previous power state as if the rationing threshold is not reached (for example, it does not

discharge VBUS or restart emulation).

Note:

If the rationing behavior is set to “Report

and

Disconnect”

when

the

charge

rationing threshold is reached, and then

the RATION_EN bit is cleared, the

portable device may start charging

sub-optimally

because

the

charger

emulation profile is removed. Toggle the

PWR_EN control to restart charger

emulation.

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