UCS1001-3 datasheet(30/57 Pages) MICROCHIP

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USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1001

DATASHEET

4.1.2

Sleep State Operation

When the UCS1001 is in the Sleep state, the device will be in its lowest power state. The high-speed

switch, bypass switch, and the port power switch will be disabled. The Attach and Removal Detection

feature will be disabled. VBUS will be near ground potential. The ALERT# pin will not be asserted. If

asserted prior to entering the Sleep state, the ALERT# pin will be released. The A_DET# pin will be

released.

Figure 4.5 shows timing diagrams for waking the UCS1001.

4.1.3

Detect State Operation

When the UCS1001 is in the Detect state, the port power switch will be disabled. The high-speed

switch is also disabled. The VBUS output will be connected to the VDD voltage by a secondary bypass

switch (see Chapter 7, Detect State).

There is one non-recommended configuration which places the UCS1001 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 4.1, "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.

4.1.3.1

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 UCS1001 will automatically transition to

the Active state and operate according to the selected Active mode.

Figure 4.5 Wake Timing

M1 or M2

Port power switch closed

(Active state)

tPIN_WAKE

Wake with M1 or M2 to Active State Data Pass-through Mode

(PWR_EN enabled, S0 = ‘0’, EM_EN = ‘0’, VS > VS_UVLO)

Bypass switch closed

(Detect state)

tPIN_WAKE

Wake with S0

(VS > VS_UVLO, M1 & M2 & EM_EN not all ‘0’ and not set to Data Pass-through)

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