UCS1002-2 datasheet(41/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

5.1.3

Detect State Operation

When the UCS1002 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 Chapter 8, Detect State).

There is one non-recommended configuration which places the UCS1002 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 5.1, "Power States Control Settings".



NOT RECOMMENDED: PWR_EN is enabled, S0 = ‘1’, and M1, M2, and EM_EN are all ‘0’.

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, "Active Mode Selection"), and supply VS > VS_UVLO. When a portable

device is attached and an Attach Detection event occurs, the UCS1002 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, "Active Mode Selection"), and configure one of the following: 1) disable PWR_EN and

supply VS, or 2) 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 1) enabling PWR_EN or 2) supplying VS above

the threshold.

APPLICATION 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.

5.1.3.3

State Change from Detect to Active

When conditions cause the UCS1002 to transition from the Detect state to the Active state, the

following occurs:

1. The Attach Detection feature will be disabled; the Removal Detection feature remains enabled,

unless S0 is changed to ‘0’.

2. The bypass switch will be turned off.

3. The discharge switch will be turned on for tDISCHARGE.

Figure 5.6 Wake Via SMBus Read with S0 = ‘0’

0101_111

invalid dataN P

SMBus Read

0001_0000

0101_111

valid data N P

0001_0000

tIDLE_SLEEP

Sleep

Dummy read returns invalid data

and places device in temporary

Active state

Read returns valid data

0101_111

Power State

temporary Active state

(not all functionality available)

tSMB_WAKE

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