UCS1002-3 datasheet(36/114 Pages) MICROCHIP

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UCS1002-3

DS20006852A-page 36

 2023 Microchip Technology Inc. and its subsidiaries

7.4.1

CHARGE RATIONING

INTERACTIONS

When charge rationing is active, regardless of the

specified behavior, the UCS1002-3 normally functions

until the charge rationing threshold is reached. Note

that charge rationing is only active when the UCS1002-

3 is in the Active state, and it does not automatically

resets when a Removal or Attach Detection event

occurs. Charger emulation starts over if a Removal

Detection event and Attach Detection event occur while

charge rationing is active and the charge rationing

threshold is not reached. This enables charging of

sequential portable devices while charge is being

rationed, which means that the accumulated power

given to several portable devices is still held to the

stated rationing limit.

Changing the charge rationing behavior has no effect

on the charge rationing data registers. If the behavior is

changed prior to reaching the charge rationing

threshold, this change occurs and become transparent

to the user. When the charge rationing threshold is

reached, the UCS1002-3 takes action as shown in

Table 7-1. If the behavior is changed after the charge

rationing threshold is reached, the UCS1002-3

immediately adopts the newly programmed behavior,

clearing the ALERT# pin and restoring switch operation

respectively (see Table 7-3).

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 (Note 1).

Ignore

Reset the Total Accumulated Charge registers.

Clear the RATION status bit.

TABLE 7-2:

CHARGE RATIONING RESET BEHAVIOR (CONTINUED)

Behavior

Reset Actions

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 changed, then charger emulation is restarted

(provided emulation is enabled via the pin states). If the pin conditions did not change, the UCS1002-3

returns to the previous power state as if the rationing threshold is not reached (for example, it does not

discharge VBUS or restart emulation).

TABLE 7-3:

EFFECTS OF CHANGING RATIONING BEHAVIOR AFTER THRESHOLD REACHED

Behavior

New Behavior

Actions taken

Ignore

Report

Assert ALERT# pin.

Report and Disconnect

Assert ALERT# pin.

Remove charger emulation profile.

Open port power switch. See the Report and Disconnect

(default) in Table 7-1.

Disconnect and Go to Sleep

Remove charger emulation profile.

Open port power switch.

Enter the Sleep state. See the Disconnect and Go to Sleep

entry in Table 7-1.

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 is restarted

(provided emulation is enabled via the pin states). If the pin conditions did not change, the UCS1002-3

returns to the previous power state as if the rationing threshold is not reached (for example, it does not

discharge VBUS or restart emulation).

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