UCS81003 datasheet(37/108 Pages) MICROCHIP

37 / 108 page

 2014 Microchip Technology Inc.

DS20005334A-page 37

UCS81003

If the RTN_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 RTN_EN control is set to ‘0’ after the

charge rationing threshold has been reached, the

following will be done:

RATION status bit will be cleared.

The ALERT# pin will be 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 RTN_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

UCS81003 will take 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

will not be 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 will be

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

UCS81003 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).

Note:

If the rationing behavior was set to “Report

and

Disconnect”

when

the

charge

rationing threshold was reached, and then

the RTN_EN bit is cleared, the portable

device may start charging sub-optimally

because the charger emulation profile has

been removed. Toggle the PWR_EN

control to restart charger emulation.

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