UCS1002-3 datasheet(35/114 Pages) MICROCHIP

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DS20006852A-page 35

UCS1002-3

When the VBUS discharge circuitry is activated, at the

end of the tDISCHARGE time, the UCS1002-3 confirms

that VBUS is discharged. If the VBUS voltage is not

below the VTEST level, a discharge error is flagged (by

setting the DISCH_ERR status bit) and the device

enters the Error state.

7.4

Battery Full

Delivery of bus current to a portable device can be

rationed by the UCS1002-3. When this functionality is

enabled, the host system must provide the UCS1002-3

with an accumulated charge maximum limit (in mAh).

The charge rationing functionality works only in the

Active power state. It continuously monitors the current

delivered and the time elapsed since the mode is

activated (or since the data is updated). This

information is compiled to generate a charge-rationing

number that is checked against the host limit.

Once the programmed current-rationing limit is reached,

the UCS1002-3 takes action as determined by the

RATION_BEH bits as described in Table 7-1. Note that

this does not cause the device to enter the Error state.

Once the charge rationing circuitry has reached the

programmed threshold, the UCS1002-3 maintains the

desired behavior until charge rationing is reset. Once

charge rationing is reset or disabled, the UCS1002-3

recovers as shown in Table 7-2.

TABLE 7-1:

CHARGE RATIONING BEHAVIOR

RATION_BEH[1:0]

Behavior

Actions taken

Notes

Report

ALERT# pin asserted.

Report

and

Disconnect

(default)

ALERT# pin asserted.

Charger emulation

profile removed.

Port power switch

disconnected.

The HSW is not affected.

All bus monitoring is still active.

Changing the M1, M2, EM_EN, S0, and

PWR_EN controls causes the device to change

power states as defined by the pin

combinations; however, the port power switch

remains OFF until the rationing circuitry is reset.

Furthermore, the bypass switch is not turned

ON if enabled via the S0 control.

Disconnect

and

Go to Sleep

Port power switch

disconnected.

Charger emulation

profile removed.

Device enters the Sleep

state.

The HSW is disabled.

All VBUS and VS monitoring are stopped.

Changing the M1, M2, EM_EN, S0, and

PWR_EN controls has no effect on the power

state until the rationing circuitry is reset.

Ignore

Take no further action.

TABLE 7-2:

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 (Note 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 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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