UCS2112 datasheet(32/64 Pages) MICROCHIP

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UCS2112

DS20005424B-page 32

 2015 Microchip Technology Inc.

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

the charge rationing threshold, rationing will be dis-

abled 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 deter-

mine the power state.

Setting the RATION_RST control to ‘1’ will automati-

cally 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 accu-

mulated restarting from 00_00h. If this is done after the

charge rationing threshold is reached, the UCS2112

will take action as shown in Table 7-3.

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.

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

Table 7-2

Disconnect and

Go to Sleep

Open port power switch.

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

Report

Ignore

Release ALERT# pin.

Report and

Disconnect

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

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 7-2.

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 7-2.

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 and bypass switch will not be

closed.

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