UCS81003 datasheet(44/108 Pages) MICROCHIP

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UCS81003

DS20005334A-page 44

 2014 Microchip Technology Inc.

If the portable device draws more than IBUS_CHG

current when the tEM_TIMEOUT timer expires, the

UCS81003 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 (unless

EM_RESP is set to 0b). The UCS81003 will

begin 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 UCS81003 will stop the currently

applied charger emulation profile. This will

cause all voltages put onto the DPOUT and

DMOUT pins to be removed. Emulation reset

occurs, and the UCS81003 will initiate the next

charger emulation profile.

Additionally, the user may “build” a charger emulation

profile by determining the voltage and resistance

characteristics that are placed on each of the DPOUT

and DMOUT pins. See Section 9.12 “Custom Charger

Emulation Profile”.

9.11.3

LEGACY 3 CHARGER

EMULATION PROFILE

The Legacy 3 Charger Emulation Profile does the

following:

The

UCS81003

will

connect

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 UCS81003 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 does not draw more than

IBUS_CHG current when tEM_TIMEOUT timer

expires, the UCS81003 will stop the Legacy 3

Charger Emulation. This will cause resistive

short between the DPOUT and DMOUT pins to be

removed. Emulation reset occurs, and the

UCS81003

will

initiate

the

charger

emulation profile.

9.11.4

LEGACY 6 CHARGER

EMULATION PROFILE

The Legacy 6 Charger Emulation Profile does the

following:

The UCS81003 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 draws more than IBUS_CHG

current when the tEM_TIMEOUT timer expires, the

UCS81003 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 (unless EM_RESP is set to 0b). The

UCS81003 will begin 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 UCS81003 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 UCS81003 will

initiate the next charger emulation profile.

9.12

Custom Charger Emulation Profile

The UCS81003 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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