UCS1001 datasheet(28/59 Pages) MICROCHIP

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USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.2 (05-21-12)

SMSC UCS1001

DATASHEET

Table 4.1 shows the settings for the various power states, except Off and Error. If VDD < VDD_TH, the

UCS1001 is in the Off state. To determine the mode of operation in the Active state, see Table 8.1,

"Active Mode Selection".

APPLICATION NOTE: Using configurations not listed in Table 4.1 is not recommended and may produce

undesirable results.

Note 4.1

In order to transition from Active state Data Pass-through mode into Sleep with these

settings, change the M1, M2, and EM_EN pins before changing the PWR_EN pin. See

Section 8.4, "Data Pass-through (No Charger Emulation)".

Note 4.2

If S0=’0’ and a portable device is not attached in DCE Cycle mode, the UCS1001 will be

cycling through charger emulation profiles. There is no guarantee which charger emulation

profile will be applied first when a portable device attaches.

Table 4.1 Power States Control Settings

POWER

STATE

PWR_EN

M1, M2,

EM_EN

PORTABLE

DEVICE

ATTACHED

BEHAVIOR

Sleep

disabled

Not set to

Data

Pass-

through.

See

Note 4.1.

All switches disabled. VBUS will be

near ground potential.

enabled

All = 0b

Detect

(see Chapter 7,

Detect State)

disabled

High-speed switch disabled. Port

power switch disabled. Host-

controlled transition to Active state

(see Section 4.1.3.2, "Host-

Controlled Transition from Detect to

Active").

< VS_UVLO

enabled

All <> 0b

> VS_UVLO

enabled

All <> 0b

High-speed switch disabled.

Automatic transition to Active state

when conditions met (see Section

4.1.3.1, "Automatic Transition from

Detect to Active").

Active

(see Chapter 8,

Active State)

> VS_UVLO

enabled

All <> 0b

and not

set to

DCE

Cycle

High-speed switch enabled /

disabled based on mode. Port power

switch is on at all times. Attach and

Removal Detection disabled.

Set to

DCE

Cycle

High-speed switch disabled. Port

power switch is on at all times.

Attach and Removal Detection

disabled. See Note 4.2.

> VS_UVLO

enabled

All <> 0b

Yes

Port power switch is on. Removal

Detection enabled.

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