UCS1002-3 datasheet(25/114 Pages) MICROCHIP

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DS20006852A-page 25

UCS1002-3

Table 5-2 shows the settings for the various power

states, except OFF and Error. If VDD < VDD_TH, the

UCS1002-3 is in the OFF state. To determine the mode

of operation in the Active state, see Table 9-1.

Active

This power state provides full functionality. While in this state, operations include activation of the port

power switch, USB data line handshaking/charger emulation, and current limiting and charge rationing.

See Section 5.1.4 “Active State Operation”.

TABLE 5-1:

POWER STATES DESCRIPTION (CONTINUED)

State

Description

Note:

Using configurations that are unlisted in

Table 5-2 is not recommended and may

produce undesirable results.

TABLE 5-2:

POWER STATES CONTROL SETTINGS

Power State

PWR_EN

M1, M2,

EM_EN

Portable

Device

Attached

Behavior

Sleep

n/a

disabled

Not set to Data

Pass-Through.

(Note 1)

n/a

• All switches disabled.

• VBUS is near ground potential.

• The UCS1002-3 wakes to

respond to SMBus

communications.

n/a

enabled

All = 0b

n/a

Detect

(see

Section 8.0

“Detect

State”

n/a

disabled

n/a

• High-Speed switch disabled (by

default).

• Port power switch disabled.

• Host-Controlled transition to

Active state (see Section 5.1.3.2

“Host-Controlled Transition

from Detect to Active”).

< VS_UVLO

enabled

All

 0b

n/a

> VS_UVLO

enabled

All

 0b

• High-Speed switch disabled (by

default).

• Automatic transition to Active

state when conditions met (see

Section 5.1.3.1 “Automatic

Transition from Detect to

Active”).

Active

(see

Section 9.0

“Active

State”)

> VS_UVLO

enabled

All

 0b

n/a

• High-Speed switch

enabled/disabled based on mode.

• Port power switch is ON at all

times.

• Attach and Removal Detection

disabled. See Note 2.

> VS_UVLO

enabled

All

 0b

Yes

• Port power switch is ON.

• Removal Detection enabled.

Note 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 9.4 “Data Pass-Through

(No Charger Emulation)”.

2: If S0 = ’0’ and a portable device is not attached in DCE Cycle mode, the UCS1002-3 is cycling through

charger emulation profiles (by default). There is no guarantee which charger emulation profile is applied

first when a portable device is attached.

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