UCS2113 datasheet(19/62 Pages) MICROCHIP

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DS20005680B-page 19

UCS2113

FIGURE 5-2:

Wake from Sleep using SMBus Read.

5.1.3

ACTIVE STATE OPERATION

Every time the UCS2113 enters the Active state, the

port power switches are closed. The UCS2113 cannot

be in the Active state (and therefore, the port power

switch cannot be turned on) if any of the following

conditions exist:

•VS <VS_UVLO

• PWR_EN1 and PWR_EN2 are disabled.

5.1.4

ERROR STATE OPERATION

The UCS2113 will enter the Error state from the Active

state when any of the following events are detected:

• The maximum allowable internal die temperature

(TTSD_HIGH) has been exceeded.

•The TTSD_LOW die temperature has been

exceeded and any of the following conditions is

met:

- a power switch operates in constant current

mode

- PWR_EN1 and/or PWR_EN2 controls

transition from inactive to active.

- it is a power up situation and PWR_EN1

and/or PWR_EN2 pins are active.

• An overcurrent condition has been detected.

• An undervoltage condition on either VBUS pin has

been detected (see Section 5.3.4 “Undervoltage

Lockout on VS”).

• A back-voltage condition has been detected (see

Section 5.3.2 “Back-voltage Detection”).

• A discharge error has been detected.

• An overvoltage condition on the VS pin.

When the UCS2113 enters the Error state, the port

power switch will be disabled while the ALERT# pin is

asserted. It will remain off while in this power state. The

UCS2113 will leave this state as determined by the fault

handling selection.

With the Auto-recovery fault handler, after the tCYCLE

time period, the UCS2113 will check that all of the error

conditions have been removed.

If all of the error conditions have been removed, the

UCS2113 will return to the Active state.

If both PWR_EN1 and PWR_EN2 controls transition

from active to inactive while the UCS2113 is in the Error

state, the device will not enter the Sleep state. After the

fault has been removed, the UCS2113 will not automat-

ically enter the Sleep state if the EN_VBUS_DISCHG

bit from the General Configuration 2 Register is not set

(default setting). To enter the Sleep state, the PWR_EN

pins must be toggled or an SMBus read register com-

mand must be sent.

5.2

Communication

The UCS2113 can operate in SMBus mode (see

Section 7.0 “System Management Bus Protocol”)

or Stand-Alone mode. The resistor connected to the

COMM_ILIM pin determines the operating mode and

the hardware-set ILIM setting, as shown in Table 5-3.

Unless connected to GND or VDD, the resistors in

Table 5-3 are external pull-down resistors.

The SMBus address is specified in Section 7.2

“SMBus Address and RD/WR Bit”.

0101_1110 A

invalid dataN P

SMBus Read

0001_0000

0101_1110 A

valid data N P

0001_0000

tIDLE_SLEEP

Sleep

Dummy read returns invalid data

and places device in temporary

Active state

Read returns valid data

0101_1111 A

Power State

temporary Active state

(not all functionality available)

tSMB_WAKE

TABLE 5-3:

COMMUNICATION DECODE

COMM_ILIM Pull Down

Resistor (±1%)

PWR_EN1 and

PWR_EN2 Polarity

ILIM (A)

Total ILIM (A)

(Note 1)

Communication

Mode

GND

Active-High

0.53

0.53 + 0.53

SMBUS

10 k



Active-High

0.96

0.96 + 0.96

SMBUS

12 k



Active-High

1.07

1.07 + 1.07

SMBUS

15 k



Active-High

1.28

1.28 + 1.28

SMBUS

18 k



Active-High

1.6

1.6 + 1.6

SMBUS

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