UCS1003-3 datasheet(55/138 Pages) MICROCHIP

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DS20005346B-page 55

UCS1003-1/2/3

9.8.1

EMULATION RESET

Prior to applying any of the charger emulation profiles,

the UCS1003-1/2/3 will perform an emulation Reset.

This means that the UCS1003-1/2/3 family resets the

VBUS line by disconnecting the port power switch and

connecting VBUS to ground via an internal 100 resis-

tor for tDISCHARGE time. The port power switch will be

held open for a time equal to tEM_RESET, at which point,

the port power switch will be closed and the VBUS

voltage applied. The DPOUT and DMOUT pins will be

pulled low using internal 15 k

 pull-down resistors.

9.8.2

EMULATION CYCLING

In Dedicated Charger Emulation Cycle mode, the

charger emulation profiles (if enabled) will be applied in

the following order:

Legacy 1

Legacy 2

Legacy 3

Legacy 4

Legacy 5

Legacy 6

Legacy 7

Custom (UCS1003-1 only; disabled by default).

If the CS_FRST Configuration bit is set, then the

custom charger emulation profile will be tested

first and the order will proceed as given.

If S0 = 0 and a portable device is not attached in DCE

Cycle mode, the UCS1003-1/2/3 will be cycling through

charger emulation profiles (by default). There is no

assurance which charger emulation profile will be

applied first when a portable device attaches.

The UCS1003-1/2/3 will apply a charger emulation

profile until one of the following exit conditions occurs:

• Current greater than IBUS_CHG is detected flowing

out of VBUS at the respective emulation time-out

time. In this case, the profile is assumed to be

accepted and no other profiles will be applied.

• The respective emulation time-out (tEM_TIMEOUT)

time is reached without current that exceeds the

IBUS_CHG limit flowing out of VBUS (the emulation

time-out is enabled by default, see Section 10.4.2

“Emulation Configuration Register”

and

rejected, and the UCS1003-1/2/3 will perform

emulation Reset and apply the next profile if there

is one.

In the case of UCS1003-1, emulation time-outs can be

programmed for each charger emulation profile (see

Section 10.11 “Preloaded Emulation Time-out Con-

figuration Registers”

and Register 10-35).

9.8.3

DCE CYCLE RETRY

If none of the charger emulation profiles cause a

charge current to be drawn, the UCS1003-1/2/3 will

perform emulation Reset and cycle through the profiles

again (if the EM_RETRY bit is set in the UCS1003-1

default – see Section 10.4.2 “Emulation Configura-

tion Register”

). The UCS1003-1/2/3 will continue to

cycle through the profiles as long as charging current is

not drawn and the PWR_EN control is enabled. If the

emulation retry is not enabled, the UCS1003-1 will flag,

“No Handshake”, and end the DCE Cycle mode using

Trip Current-Limiting mode.

Note:

To help prevent possible damage to a

portable device, the DPOUT and DMOUT

pins have current limiting in place when

the emulation profiles are applied.

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