UCS1003-2 datasheet(36/138 Pages) MICROCHIP

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UCS1003-1/2/3

DS20005346B-page 36

 2014-2015 Microchip Technology Inc.

5.1.3

DETECT STATE OPERATION

When the UCS1003-1/2/3 is in the Detect state, the

port power switch will be disabled. The high-speed

switch is also disabled by default. The VBUS output will

be connected to the VDD voltage by a secondary

bypass switch (see Section 8.0 “Detect State”).

There is one non-recommended configuration which

places the UCS1003-1/2/3 in the Detect state, but VBUS

will not be discharged and a portable device

attachment will not be detected. For the recommended

configurations, see Table 5-2.

There are two methods for transitioning from the Detect

state to the Active state: automatic and host-controlled.

5.1.3.1

Automatic Transition

from Detect to Active

For the Detect state, set S0 to ‘1’, enable PWR_EN, set

the EM_EN, M1 and M2 controls to the desired Active

mode (Table 9-1), and supply VS >VS_UVLO. When a

portable device is attached and an Attach Detection

event occurs, the UCS1003-1/2/3 will automatically

transition to the Active state and operate according to

the selected Active mode.

5.1.3.2

Host-Controlled Transition from

Detect to Active

For the Detect state, set S0 to ‘1’, set the EM_EN, M1

and M2 controls to the desired Active mode (Table 9-1),

and configure one of the following:

• Disable PWR_EN and supply VS

• Enable PWR_EN and don’t supply VS; when a

portable device is attached and an Attach

Detection event occurs, the host must respond to

transition to the Active state.

Depending on the control settings in the Detect state,

this could entail:

• Enabling PWR_EN

• Supplying VS above the threshold.

5.1.3.3

State Change from Detect to Active

When conditions cause the UCS1003-1/2/3 to

transition from the Detect state to the Active state, the

following occurs:

The Attach Detection feature will be disabled;

the Removal Detection feature remains enabled

unless S0 is changed to ‘0’.

The bypass switch will be turned off.

The discharge switch will be turned on briefly for

tDISCHARGE.

The port power switch will be turned on.

5.1.4

ACTIVE STATE OPERATION

Every time that the UCS1003-1/2/3 enters the Active

state and the port power switch is closed, it will enter

the mode as instructed by the host controller (see

Section 9.0 “Active State”

). The UCS1003-1/2/3

cannot be in the Active state (and therefore, the port

power switch cannot be turned on) if any of the

following conditions exist:

•VS <VS_UVLO

• PWR_EN is disabled

• M1, M2 and EM_EN are all set to ‘0’

• S0 is set to ‘1’ and an Attach Detection event has

not occurred

5.1.5

ERROR STATE OPERATION

The UCS1003-1/2/3 will enter the Error state from the

Active state when any of the following events are

detected:

• The maximum allowable internal die temperature

(TTSD) has been exceeded (see Section 7.2.1.2

“Thermal Shutdown”

• An overcurrent condition has been detected (see

Section 7.1.1 “Current Limit Setting”

• An undervoltage condition on VBUS has been

detected (see Section 5.2.5 “Undervoltage

Lockout on VS”).

• A backdrive condition has been detected (see

Section 5.2.3 “Back-Voltage Detection”

• A discharge error has been detected (see

Section 7.3 “VBUS Discharge”).

• An overvoltage condition on the VS pins.

The UCS1003-1/2/3 will enter the Error state from the

Detect state when a backdrive condition has been

detected or when the maximum allowable internal die

temperature has been exceeded.

The UCS1003-1/2/3 will enter the Error state from the

Sleep state when a backdrive condition has been

detected.

Note:

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.

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