UCS1002-3 datasheet(27/114 Pages) MICROCHIP

27 / 114 page

 2023 Microchip Technology Inc. and its subsidiaries

DS20006852A-page 27

UCS1002-3

5.1.3

DETECT STATE OPERATION

When the UCS1002-3 is in the Detect state, the port

power switch is disabled. The high-speed switch is also

disabled by default. The VBUS output is connected to

the VDD voltage by a secondary bypass switch (see

Section 8.0 “Detect State”).

There is one non-recommended configuration which

places the UCS1002-3 in the Detect state, but VBUS is

not discharged and a portable device attachment is not

detected. For the recommended configurations, see

Table 5-2.

There are two methods for transitioning from the Detect

state to the Active state: automatic and host-controlled.

5.1.3.1

Automatic Transition

from Detect to Active

For the Detect state, set S0 to ‘1’, enable PWR_EN, set

the EM_EN, M1, and M2 controls to the desired Active

mode (Table 9-1), and supply VS > VS_UVLO. When a

portable device is attached and an Attach Detection

event occurs, the UCS1002-3 automatically transitions

to the Active state and operate according to the

selected Active mode.

5.1.3.2

Host-Controlled Transition from

Detect to Active

For the Detect state, set S0 to ‘1’, set the EM_EN, M1,

and M2 controls to the desired Active mode (Table 9-1),

and configure one of the following:

disable PWR_EN and supply VS, or

enable PWR_EN and do not supply VS. When a

portable device is attached and an Attach

Detection event occurs, the host must respond

to transition to the Active state.

Depending on the control settings in the Detect state,

this entails:

enabling PWR_EN, or

supplying VS above the threshold.

5.1.3.3

State Change from Detect to Active

When conditions cause the UCS1002-3 to transition

from the Detect state to the Active state, the following

occurs:

The Attach Detection feature is disabled and the

Removal Detection feature remains enabled

unless S0 is changed to ‘0’.

The bypass switch is turned OFF.

The discharge switch is turned ON briefly for

tDISCHARGE.

The port power switch is turned ON.

5.1.4

ACTIVE STATE OPERATION

Whenever the UCS1002-3 enters the Active state and

the port power switch is closed, it enters the mode as

instructed by the host controller (see Section 9.0

“Active State”). The UCS1002-3 cannot be in the

Active state (therefore, the port power switch cannot be

turned ON) if any of the following conditions exist:

•VS < VS_UVLO

• PWR_EN is disabled.

• M1, M2, and EM_EN are all set to '0'.

• S0 is set to ‘1’ and an Attach Detection event did

not occur.

5.1.5

ERROR STATE OPERATION

The UCS1002-3 enters the Error state from the Active

state when any of the following events are detected:

• Maximum allowable internal die temperature is

exceeded (TTSD) (see Section 7.2.1.2 “Thermal

Shutdown”).

• An overcurrent condition (see Section 7.1.1

“Current Limit Setting”).

• An undervoltage condition on VBUS (see

Section 5.2.5 “Undervoltage Lockout on VS”).

• A back-drive condition (see Section 5.2.3 “Back-

voltage Detection”).

• A discharge error (see Section 7.3 “VBUS Dis-

charge”).

• An overvoltage condition on the VS pins.

The UCS1002-3 enters the Error state from the Detect

state when a back-drive condition is detected or when

the maximum allowable internal die temperature is

exceeded.

The UCS1002-3 enters the Error state from the Sleep

state when a back-drive condition is detected.

When the UCS1002-3 enters the Error state, the port

power switch, VBUS bypass switch, and the high-

speed switch are turned OFF, and the ALERT# pin is

asserted (by default). These switches remain OFF

while in this power state. The UCS1002-3 leaves this

state as determined by the fault handling selection (see

Section 7.5 “Fault Handling Mechanism”).

Note:

Not recommended – PWR_EN is

enabled, S0 = ‘1’, and M1, M2, and

EM_EN are all ‘0’.

Note:

If S0 is '1', PWR_EN is enabled and VS is

not present, the A_DET# pin cycles if the

current draw exceeds the current capacity

of the bypass switch.

UCS1002-3 Datasheet(PDF) 27 Page - Microchip Technology

UCS1002-3 Datasheet(HTML) 27 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL