UCS1002-3 datasheet(44/114 Pages) MICROCHIP

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UCS1002-3

DS20006852A-page 44

 2023 Microchip Technology Inc. and its subsidiaries

the behavior after the profile is applied is different than

Active mode BC1.2 DCP (BC1.2 DCP in Table 9-1)

because the tEM_TIMEOUT timer is enabled (by default)

during the DCE Cycle.

During the DCE Cycle after the DCP charger emulation

profile, the UCS1002-3 will perform one of the

following:

If the portable device is drawing more than

IBUS_CHG current when the tEM_TIMEOUT timer

expires, the UCS1002-3 will flag that a BC1.2

DCP was detected. The UCS1002-3 will leave in

place the resistive short, leave the high-speed

switch open, and then enable constant current

limiting (variable slope).

If the portable device does not draw more than

IBUS_CHG current when the tEM_TIMEOUT timer

expires, the UCS1002-3 will stop applying the

DCP charger emulation profile and proceed to

the next charger emulation profile in the DCE

Cycle.

9.11.2

LEGACY 2 CHARGER

EMULATION PROFILE

The Legacy 2 Charger Emulation Profile does the

following:

The UCS1002-3 connects a resistor (RDCP_RES)

between DPOUT and DMOUT.

VBUS is applied.

If the portable device draws more than IBUS_CHG

current when the tEM_TIMEOUT timer expires

(enabled by default), the UCS1002-3 accepts

that this is the correct charger emulation profile

for the attached portable device. Charging

commences. The resistive short between the

DPOUT and DMOUT pins is left in place. The

UCS1002-3 will use constant current limiting.

If the portable device does not draw more than

IBUS_CHG current when tEM_TIMEOUT timer

expires, the UCS1002-3 stops the Legacy 2

Charger Emulation. This causes resistive short

between the DPOUT and DMOUT pins to be

removed. Emulation Reset occurs, and the

UCS1002-3 initiates the next charger emulation

profile.

9.11.3

LEGACY 1, 3, 4, AND 6 CHARGER

EMULATION PROFILES

Legacy 1, 3, 4, and 6 Charger Emulation Profiles follow

the same pattern of operation, although the voltage that

is applied on the DPOUT and DMOUT pins varies. The

profiles do the following:

The UCS1002-3 applies a voltage on the

DPOUT pin using either a current-limited volt-

age source or a voltage divider between VBUS

and ground with the center tap on the DPOUT

pin.

The UCS1002-3 applies a possibly different

voltage on the DMOUT pin, using either a

current-limited voltage source or a voltage

divider between VBUS and ground, with the

center tap on the DMOUT pin.

VBUS voltage is applied.

If the portable device draws more than IBUS_CHG

current when the tEM_TIMEOUT timer expires, the

UCS1002-3 accepts that the currently applied

profile is the correct charger emulation profile for

the

attached

portable

device.

Charging

commences. The voltages applied to the

DPOUT and DMOUT pins remain in place

(unless EM_RESP is set to 0b). The UCS1002-

3 begins operating in Trip mode or CC mode as

determined by the IBUS_R2MIN setting (see

Section 10.14 “Current Limiting Behavior

Configuration Registers”).

If the portable device does not draw more than

IBUS_CHG current when tEM_TIMEOUT timer

expires, the UCS1002-3 stops the currently

applied charger emulation profile. This causes

all voltages put onto the DPOUT and DMOUT

pins to be removed. Emulation Reset occurs,

and the UCS1002-3 initiates the next charger

emulation profile.

9.11.4

LEGACY 5 CHARGER

EMULATION PROFILE

The Legacy 5 Charger Emulation Profile does the

following:

The UCS1002-3 applies 900 mV to both the

DPOUT and the DMOUT pins.

VBUS voltage is applied.

If the portable device draws more than IBUS_CHG

current when the tEM_TIMEOUT timer expires, the

UCS1002-3 accepts that the currently applied

profile is the correct charger emulation profile for

the

attached

portable

device.

Charging

commences. The voltages applied to the

DPOUT and DMOUT pins remains in place

(unless EM_RESP is set to 0b). The UCS1002-

3 begins to operate in Trip mode or CC mode as

determined by the IBUS_R2MIN setting (see

Section 10.14 “Current Limiting Behavior

Configuration Registers”).

If the portable device does not draw more than

IBUS_CHG current when tEM_TIMEOUT timer

expires, the UCS1002-3 stops the currently

applied charger emulation profile. This causes

all voltages put onto the DPOUT and DMOUT

pins to be removed. Emulation Reset occurs,

and the UCS1002-3 initiates the next charger

emulation profile.

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