UCS1003-2 datasheet(46/138 Pages) MICROCHIP

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UCS1003-1/2/3

DS20005346B-page 46

 2014-2015 Microchip Technology Inc.

7.4.1

CHARGE RATIONING

INTERACTIONS

When charge rationing is active, regardless of the

specified behavior, the UCS1003-1 will function nor-

mally until the charge rationing threshold is reached.

Note that charge rationing is only active when the

UCS1003-1 is in the Active state and it does not auto-

matically reset when a Removal or Attach Detection

event occurs. Charger emulation will start over if a

Removal Detection event and Attach Detection event

occur while charge rationing is active, and the charge

rationing threshold has not been reached. This allows

charging of sequential portable devices while charge is

being rationed, which means that the accumulated

power given to several portable devices will still be held

to the stated rationing limit.

Changing the charge rationing behavior will have no

effect on the Charge Rationing Data registers. If the

behavior is changed prior to reaching the charge

rationing threshold, this change will occur and be

transparent to the user. When the charge rationing

threshold is reached, the UCS1003-1 will take action,

as shown in Table 7-2. If the behavior is changed after

the charge rationing threshold has been reached, the

UCS1003-1

will

immediately

adopt

the

newly

programmed behavior, clearing the ALERT# pin and

restoring switch operation respectively (see Table 7-4).

TABLE 7-3:

CHARGE RATIONING RESET BEHAVIOR

Behavior

Reset Actions

Report

Reset the Total Accumulated Charge registers.

Clear the RATION status bit.

Release the ALERT# pin.

Report

and Disconnect

Reset the Total Accumulated Charge registers.

Clear the RATION status bit.

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).

Disconnect

and Go to Sleep

Reset the Total Accumulated Charge registers.

Clear the RATION status bit.

Check the M1, M2, EM_EN, S0 and PWR_EN controls and enter the indicated power state

if the controls changed (see Note 1).

Ignore

Reset the Total Accumulated Charge registers.

Clear the RATION status bit.

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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