UCS2113 datasheet(26/62 Pages) MICROCHIP

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UCS2113

DS20005680B-page 26

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6.5

Charge Rationing Interactions

When charge rationing is active, regardless of the

specified behavior, the UCS2113 will function normally

until the charge rationing threshold is reached. Note

that charge rationing is only active when the UCS2113

is in the Active state. 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 UCS2113

will take action as shown in Table 6-2. If the behavior

is changed after the charge rationing threshold has

been reached, the UCS2113 will immediately adopt

the newly programmed behavior, clearing the ALERT#

pin and restoring switch operation respectively (see

Table 6-4).

TABLE 6-2:

CHARGE RATIONING BEHAVIOR

RATION_BEH

(1 or 2) <1:0>

Behavior

Actions Taken

Notes

Report

ALERT# pin asserted.

Report and

Disconnect

(default)

ALERT# pin asserted

Port power switch discon-

nected

All bus monitoring is still active.

Toggling the PWR_EN control will cause the

device to change power states as defined by the

registers; however, the port power switch will

remain off until the rationing circuitry is reset.

Disconnect

and

Go to Sleep

Port power switch discon-

nected

Device will enter the Sleep

state

All VBUS and VS monitoring will be stopped.

Toggling the PWR_EN control will have no effect

on the power state until the rationing circuitry is

reset.

Ignore

Take no further action

TABLE 6-3:

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 PWR_EN controls and enter the indicated power state if the controls

changed

Disconnect and

Go to Sleep

Reset the Total Accumulated Charge registers

Clear the RATION status bit

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

changed

Ignore

Reset the Total Accumulated Charge registers

Clear the RATION status bit

TABLE 6-4:

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 6-2

Disconnect and

Go to Sleep

Open port power switch

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

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