UCS1003-1 datasheet(39/138 Pages) MICROCHIP

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DS20005346B-page 39

UCS1003-1/2/3

5.4

Discrete Output Pins

5.4.1

ALERT# AND A_DET#

OUTPUT PINS

The ALERT# pin is an active-low, open-drain interrupt

to the host controller. The ALERT# pin is asserted (by

default – see ALERT_MASK in Section 10.4.1 “Gen-

eral Configuration Register”

) when an error occurs

(see Register 10-3). In the case of UCS1003-1, the

ALERT# pin can also be asserted when the LOW_CUR

(portable device is pulling less current and may be

finished charging) or TREG (thermal regulation

temperature exceeded) bits are set and linked. Also,

when charge rationing is enabled in UCS1003-1, the

ALERT# pin is asserted by default when the current

rationing threshold is reached (as determined by

RATION_BEH<1:0> – see Table 7-2). The ALERT# pin

is released when all error conditions that may assert

the ALERT# pin (such as an error condition, charge

rationing, and TREG and LOW_CHG if linked) have

been removed or reset as necessary.

The A_DET# pin (UCS1003-1, UCS1003-3) provides

an active-low, open-drain output indication that a valid

Attach Detection event has occurred. It will remain

asserted until the UCS1003-1 or UCS1003-3 is placed

into the Sleep state, or a Removal Detection event

occurs. For wake on USB, the A_DET# pin assertion

can be utilized by the system. If the S0 control is ‘0’ and

the UCS1003-1 or UCS1003-3 is in the Active state,

the A_DET# pin will be asserted regardless if a

portable device is attached or not. If S0 is ‘1’, PWR_EN

is enabled and VS is not present; the A_DET# pin will

cycle if the current draw exceeds the current capacity

of the bypass switch.

The CHRG# pin (UCS1003-2) provides an active-low,

open-drain output indication that charging of an

attached device is active. It will remain asserted until

this condition no longer exists and then will be

automatically released.

5.4.2

INTERRUPT BLANKING

The ALERT#, A_DET# (UCS1003-1 and UCS1003-3)

and CHRG# (UCS1003-2) pins will not be asserted for

a specified time (up to tBLANK) after power-up.

Additionally, an error condition (except for the thermal

shutdown) must be present for longer than a specified

time (tMASK) before the ALERT# pin is asserted.

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