UCS1002-3 datasheet(45/114 Pages) MICROCHIP

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DS20006852A-page 45

UCS1002-3

9.11.5

LEGACY 7 CHARGER

EMULATION PROFILE

Legacy 7 Charger Emulation Profile steps:

The UCS1002-3 applies 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 draws more than IBUS_CHG

current when the tEM_TIMEOUT timer expires, the

UCS1002-3 accepts that Legacy 7 is the correct

charger emulation profile for the attached

portable device. Charging commences. The

voltage applied to the DPOUT pin remains 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 Legacy 7

Charger Emulation Profile. This causes the

voltage put onto the DPOUT pin to be removed.

Emulation Reset occurs, and the UCS1002-3

initiates the next charger emulation profile.

9.12

Custom Charger Emulation Profile

The UCS1002-3 enables 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 are detected and applied

in sequence, enabling 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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