UCS1003-2 datasheet(35/138 Pages) MICROCHIP

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DS20005346B-page 35

UCS1003-1/2/3

5.1.1

OFF STATE OPERATION

The device is in the OFF state if VDD is less than

VDD_TH. When the UCS1003-1/2/3 devices are in the

OFF state, it does nothing and all circuitry is disabled.

In the case of UCS1003-1, the digital register values

are not stored and the device will not respond to

SMBus commands.

5.1.2

SLEEP STATE OPERATION

When the UCS1003-1/2/3 devices are in the Sleep

state, the device is in its lowest power state. The high-

speed switch, bypass switch and the port power switch

are disabled. The Attach and Removal Detection

feature is disabled. VBUS will be near ground potential.

The ALERT# pin is not asserted. If asserted prior to

entering the Sleep state, the ALERT# pin will be

released. The A_DET# pin is released. In the case of

UCS1003-1, SMBus activity is limited to single byte

read or write.

The first data byte read from the UCS1003-1, when in

the Sleep state, will wake the device; however, the data

to be read will return all ‘0’s and should be considered

invalid. This is a “dummy” read byte meant to wake the

UCS1003-1. Subsequent read or write bytes will be

accepted normally. After the dummy read, the

UCS1003-1 will be in a higher power state (see

Figure 5-6). The device will return to Sleep after the last

communication or if no further communication has

occurred.

Figure 5-5 shows the timing diagrams for waking the

UCS1003-1/2/3 family via external pins. Figure 5-6

shows the timing for waking the UCS1003-1 device via

SMBus.

FIGURE 5-5:

Wake Timing via External Pins.

FIGURE 5-6:

Wake via SMBus Read with S0 = 0.

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’s and not set to data pass-through)

0101_1110

invalid

data

SMBus Read

0001_0000

0101_1110

valid data

0001_0000

tIDLE_SLEEP

Sleep

Dummy Read Returns Invalid Data and Places Device in

Temporary Active State

Read Returns Valid Data

0101_1111

Power State

Temporary Active State

(not all functionality available)

tSMB_WAKE

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