UCS1003-2 datasheet(47/138 Pages) MICROCHIP

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DS20005346B-page 47

UCS1003-1/2/3

TABLE 7-4:

EFFECTS OF CHANGING RATIONING BEHAVIOR AFTER THRESHOLD REACHED

Behavior

New

Behavior

Actions taken

Ignore

Report

Assert ALERT# pin.

Report

and

Disconnect

Assert ALERT# pin.

Remove charger emulation profile.

Open port power switch. See the Report and Disconnect (default) in Table 7-2.

Disconnect

and

Go to Sleep

Remove charger emulation profile.

Open port power switch.

Enter the Sleep state. See the Disconnect and Go to Sleep entry 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 7-2.

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 7-2.

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 7-2.

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 will not be closed (see Note 1).

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 will be

restarted (provided emulation is enabled via the pin states). If the pin conditions have not changed, the

UCS1003-1 returns to the previous power state as if the rationing threshold had not been reached (e.g., it

will not discharge VBUS or restart emulation).

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