UCS1003-3 datasheet(53/138 Pages) MICROCHIP

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DS20005346B-page 53

UCS1003-1/2/3

9.0

ACTIVE STATE

9.1

Active State Overview

The UCS1003-1/2/3 family has the following modes of

operation in the Active state: Data Pass-Through,

BC1.2 DCP, BC1.2 SDP, BC1.2 CDP and Dedicated

Charger Emulation Cycle. The Current-Limiting mode

depends on the Active mode behavior (see Table 9-2).

9.2

Active Mode Selection

The Active mode selection is controlled by three

controls: EM_EN, M1 and M2, as shown in Table 9-1.

9.3

BC1.2 Detection Renegotiation

The BC1.2 specification allows a charger to act as an

SDP, CDP or DCP and to change between these roles.

To force an attached portable device to repeat the

Charging Detection procedure, VBUS must be cycled. In

compliance with this specification, the UCS1003-1/2/3

family automatically cycles VBUS when switching

between the BC1.2 SDP, BC1.2 DCP and BC1.2 CDP

modes.

9.4

Data Pass-Through

(No Charger Emulation)

When commanded to Data Pass-Through mode, the

UCS1003-1/2/3 devices will close their USB high-

speed data switch to allow USB communications

between a portable device and host controller, and will

operate using Trip Current-Limiting mode. No charger

emulation profiles are applied in this mode. Data Pass-

Through mode will persist until commanded otherwise

by the M1, M2 and EM_EN controls.

9.5

BC1.2 SDP (No Charger

Emulation)

When commanded to BC1.2 SDP mode, UCS1003-1/2/3

devices will discharge VBUS, close their USB high-speed

data switch to allow USB communications between a por-

table device and host controller, and will operate using

Trip Current-Limiting mode. No charger emulation profiles

are applied in this mode. BC1.2 SDP mode will persist

until commanded otherwise by the M1, M2, EM_EN and

PWR_EN controls.

9.6

BC1.2 CDP

When BC1.2 CDP is selected as the Active mode,

UCS1003-1/2/3 devices will discharge VBUS, close their

USB high-speed data switch (by default) and apply the

BC1.2 CDP charger emulation profile, which performs

handshaking per the specification. The combination of

the UCS1003-1/2/3 CDP handshake, along with a

standard USB host, comprises a charging downstream

port. In BC1.2 CDP mode, there is no emulation time-out.

If the handshake is successful, the UCS1003-1/2/3 will

operate using Constant-Current Limiting (variable

slope). If the handshake is not successful, the

UCS1003-1/2/3 will leave the applied CDP profile in

place, leave the high-speed switch closed, enable

Constant-Current Limiting and persist in this condition

until commanded otherwise by the M1, M2, EM_EN

and PWR_EN controls.

TABLE 9-1:

ACTIVE MODE SELECTION

EM_EN

Active mode

Dedicated Charger Emulation

Cycle

Data Pass-Through

BC1.2 DCP

BC1.2 SDP (Note 1)

Dedicated Charger Emulation

Cycle

Data Pass-Through

BC1.2 CDP

Note 1:

BC1.2 SDP behaves the same as the

Data Pass-Through mode with the

exception that it is preceded by a VBUS

discharge when the mode is entered per

the BC1.2 specification.

Note 1:

If it is desired that the Data Pass-Through

mode operates as a traditional/standard

port power switch, the S0 control should be

set to ‘0’ to allow the port power switch to

be closed without requiring an Attach

Detection event. When entering this mode,

there is no automatic VBUS discharge.

When the M1, M2 and EM_EN controls

are set to ‘0’, ‘1’, ‘0’ or to ‘1’, ‘1’, ‘0’,

respectively, Data Pass-Through mode

will persist if the PWR_EN control is

disabled; however, the UCS1003-1/2/3

will draw more current. To leave the Data

Pass-Through mode, the PWR_EN

control must be enabled before the M1,

M2 and EM_EN controls are changed to

the desired mode.

Note:

If it is desired that the BC1.2 SDP mode

operates as a traditional/standard port

power switch, the S0 control should be set

to ‘0’ to allow the port power switch to be

closed

without

requiring

Attach

Detection event.

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