UCS81003 datasheet(27/108 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS20005334A-page 27

UCS81003

Table 5-2 shows the settings for the various power

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

UCS81003 is in the Off state. To determine the mode of

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

Note:

Using

configurations

not

listed

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 will be near ground potential.

• The UCS81003 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)”.

If S0 = ’0’ and a portable device is not attached in DCE Cycle mode, the UCS81003 will be cycling through

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

applied first when a portable device attaches.

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