UCS1001 datasheet(33/59 Pages) MICROCHIP

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USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1001

Revision 1.2 (05-21-12)

DATASHEET

4.3.3

M1, M2, and EM_EN Inputs

The M1, M2, and EM_EN input controls determine the Active mode and affect the power state (see

Table 4.1, "Power States Control Settings" and Table 8.1, "Active Mode Selection"). When these

controls are all set to ‘0’ and PWR_EN is enabled, the UCS1001 Attach and Removal Detection feature

is disabled.

4.3.4

PWR_EN Input

The PWR_EN control enables the port power switch to be turned on if conditions are met and affects

the power state (see Table 4.1, "Power States Control Settings"). The port power switch cannot be

closed if PWR_EN is disabled. However, if PWR_EN is enabled, the port power switch is not

necessarily closed (see Section 4.1.4, "Active State Operation"). Polarity is controlled by the SEL pin.

4.3.5

Latch Input

The Latch input control determines the behavior of the fault handling mechanism (see Section 6.5,

"Fault Handling Mechanism").

4.3.6

S0 Input

The S0 control enables the Attach and Removal Detection feature and affects the power state (see

Table 4.1, "Power States Control Settings"). When S0 is set to ‘1’, an Attach Detection event must

occur before the port power switch can be turned on. When S0 is set to ‘0’, the Attach and Removal

Detection feature is not enabled.

4.4

Discrete Output Pins

4.4.1

ALERT#, CHRG#, and A_DET# Output Pins

The ALERT# pin is an active low open-drain interrupt to the host controller. The ALERT# pin is

asserted when an error occurs (see Section 4.1.5, "Error State Operation"). The ALERT# pin is

released when all error conditions have been removed.

The CHRG# pin (UCS1001-1 only) 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.

The A_DET# pin (UCS1001-2 only) provides an active low open-drain output indication that a valid

Attach Detection event has occurred. It will remain asserted until the UCS1001 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 UCS1001 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.

4.4.2

Interrupt Blanking

The ALERT#, CHRG# (UCS1001-1 only), and A_DET# (UCS1001-2 only) 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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