UCS1003-2 datasheet(59/138 Pages) MICROCHIP

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DS20005346B-page 59

UCS1003-1/2/3

9.12.2

LEGACY 2, 4, 5 AND 7 CHARGER

EMULATION PROFILES

Legacy 2, 4, 5 and 7 charger emulation profiles follow

the same pattern of operation, although the voltage that

is applied on the DPOUT and DMOUT pins will vary. They

do the following:

The UCS1003-2/3 will apply a voltage on the

DPOUT pin using either a current-limited voltage

source or a voltage divider between VBUS and

ground, with the center tap on the DPOUT pin.

The UCS1003-2/3 will apply 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.

the

portable

device

charging,

the

UCS1003-2/3 will accept 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 will remain in place. The

UCS1003-2/3 will begin operating in Trip mode

(see Section 10.14 “Current-Limiting Behavior

Configuration Registers”

If the portable device is not charging, the

UCS1003-2/3 will stop the currently applied

charger emulation profile. This will cause all volt-

ages put onto the DPOUT and DMOUT pins to be

removed. Emulation Reset occurs and the

UCS1003-2/3 will initiate the next charger

emulation profile.

9.12.3

LEGACY 3 CHARGER

EMULATION PROFILE

The Legacy 3 charger emulation profile does the

following:

The UCS1003-2/3 will connect a resistor

(RDCP_RES) between DPOUT and DMOUT.

VBUS is applied.

If the portable device is charging, the

UCS1003-2/3 will accept that this is the correct

charger emulation profile for the attached

portable device; charging commences. The

resistive short between the DPOUT and DMOUT

pins will be left in place.

If the portable device is not charging, the

UCS1003-2/3 will stop the Legacy 3 charger

emulation. This will cause a resistive short

between the DPOUT and DMOUT pins to be

removed. Emulation Reset occurs and the

UCS1003-2/3 will initiate the next charger

emulation profile.

9.12.4

LEGACY 6 CHARGER

EMULATION PROFILE

The Legacy 6 charger emulation profile does the

following:

The UCS1003-2/3 will apply a voltage on the

DPOUT pin using a voltage divider between VBUS

and ground, with the center tap on the DPOUT

pin.

VBUS voltage is applied.

If the portable device is charging, the

UCS1003-2/3 will accept that Legacy 6 is the

correct charger emulation profile for the

attached portable device; charging commences.

The voltage applied to the DPOUT pin will remain

in place. The UCS1003-2/3 will begin operating

in Trip mode.

If the portable device is not charging, the

UCS1003-2/3 will stop the Legacy 6 charger

emulation profile. This will cause the voltage put

onto the DPOUT pin to be removed. Emulation

Reset occurs and the UCS1003-2/3 will initiate

the next charger emulation profile.

9.13

Custom Charger Emulation Profile

(UCS1003-1 only)

The UCS1003-1 allows the user to create a custom

charger emulation profile to handshake as any type of

charger. This profile can be included in the DCE Cycle.

In addition, it can be placed first or last in the profile

sequence in the DCE Cycle (see Register 10-35).

The custom charger emulation profile uses a number of

registers to define stimuli and behaviors. The custom

charger emulation profile uses three separate

stimulus/response pairs that will be detected and

applied in sequence, allowing flexibility to “build” any of

the preloaded emulation profiles, or tailor the profile to

match a specific charger application.

For details, see Application Note 24.14 – “UCS1002

Fundamentals of Custom Charger Emulation”

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