UCS1002-3 datasheet(40/114 Pages) MICROCHIP

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UCS1002-3

DS20006852A-page 40

 2023 Microchip Technology Inc. and its subsidiaries

9.0

ACTIVE STATE

9.1

Active State Overview

The UCS1002-3 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 enables 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 UCS1002-3

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,

UCS1002-3 closes its USB high-speed data switch to

enable USB communications between a portable

device and host controller and operates using Trip

Current Limiting. No charger emulation profiles are

applied in this mode. Data Pass-Through mode

persists 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, UCS1002-3

discharges VBUS, closes its USB high-speed data

switch to enable USB communications between a

portable device and host controller, and operates using

Trip Current Limiting. No charger emulation profiles are

applied in this mode. BC1.2 SDP mode persists 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,

UCS1002-3 discharges VBUS, closes its USB

high-speed data switch (by default), and applies the

BC1.2 CDP charger emulation profile which performs

handshaking per the specification. The combination of

the UCS1002-3 CDP handshake along with a standard

USB host comprises a Charging Downstream Port. In

BC1.2 CDP mode, there is no emulation timeout.

If the handshake is successful, the UCS1002-3

operates using Constant Current Limiting (variable

slope). If the handshake is not successful, the

UCS1002-3 leaves the applied CDP profile in place,

leaves the high-speed switch closed, enables Constant

Current Limiting, and persists 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 must be

set to ‘0’. When entering this mode, there

is no automatic VBUS discharge.

2: When the M1, M2, and EM_EN controls

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

respectively, Data Pass-Through mode

persists if the PWR_EN control is

disabled;

however,

the

UCS1002-3

draws 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 must be set

to ‘0’.

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