UCS2113 datasheet(27/62 Pages) MICROCHIP

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DS20005680B-page 27

UCS2113

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 additional steps occur:

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 PWR_EN controls are checked to

determine the power state.

Setting

the

RATION_RST

control

‘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

UCS2113 will take action as shown in Table 6-3.

Report

Ignore

Release ALERT# pin.

Report and

Disconnect

Open port power switch. See the Report and Disconnect (default) in Table 6-2.

Disconnect and

Go to Sleep

Release the ALERT# pin

Open the port power switch

Enter the Sleep state. See the Disconnect and Go to Sleep in Table 6-2.

Report and

Disconnect

Ignore

Release the ALERT# pin

Check the PWR_EN controls and enter the indicated power state if the

controls changed

Report

Check the PWR_EN controls and enter the indicated power state if the controls

changed

Disconnect and

Go to Sleep

Release the ALERT# pin

Enter the Sleep state. See the Disconnect and Go to Sleep in Table 6-2.

Disconnect

and Go to

Sleep

Ignore

Check the PWR_EN controls and enter the indicated power state if the controls

changed

Report

Assert the ALERT# pin

Check the PWR_EN controls and enter the indicated power state if the

controls changed

Report and

Disconnect

Assert the ALERT# pin

Check the PWR_EN controls to determine the power state, then enter that

state, except that the port power switch will not be closed

TABLE 6-4:

EFFECTS OF CHANGING RATIONING BEHAVIOR AFTER THRESHOLD REACHED

Behavior

New Behavior

Actions Taken

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