UCS81003 datasheet(41/108 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS20005334A-page 41

UCS81003

The

UCS81003

will

respond

per

the

BC1.2

specification to the portable device initiated charger

renegotiation requests.

9.6.1

BC1.2 CDP CHARGER

EMULATION PROFILE

The BC1.2 CDP charger emulation profile acts in a

reactionary manner based on stimulus from the

portable device as described below and shown in

Figure 2-1.

VBUS voltage is applied.

Primary Detection - When the portable device

drives a voltage between 0.4V and 0.8V onto the

DPOUT pin, the UCS81003 will drive 0.6V onto

the DMOUT pin within 20 ms.

When the portable device drives the DPOUT pin

back to ‘0’, the UCS81003 will then drive the

DMOUT pin back to ‘0’ within 20 ms.

Optional Secondary Detection - If the portable

device then drives a voltage of 0.6V (nominal)

onto the DMOUT pin, the UCS81003 will take no

other action. This will cause the portable device

to observe a ‘0’ on the DPOUT pin and know that

it is connected to a CDP.

9.7

BC1.2 DCP

When BC1.2 DCP is selected as the Active mode,

UCS81003 will discharge VBUS and apply the BC1.2

DCP charger emulation profile per the specification. In

BC1.2

DCP

mode,

the

emulation

timeout

and

requirement for portable device current draw are

automatically disabled. When the BC1.2 DCP charger

emulation profile is applied within the Dedicated

Charger

Emulation

Cycle

(see

Section 9.11.3

“Legacy 3 Charger Emulation Profile”), the timeout

and current draw requirement are enabled.

If the portable device is charging after the DCP

charger emulation profile is applied, the UCS81003

will leave in place the resistive short, leave the high-

speed switch open and enable Constant Current

Limiting (variable slope).

9.7.1

BC1.2 DCP CHARGER

EMULATION PROFILE

The BC1.2 DCP charger emulation profile is described

as follows:

VBUS voltage is applied. A resistor (RDCP_RES) is

connected between the DPOUT and DMOUT pins.

Primary Detection - If the portable device drives

0.6V (nominal) onto the DPOUT pin, the

UCS81003 will take no other action than to

leave the resistor connected between DPOUT

and DMOUT. This will cause the portable device

to see 0.6V (nominal) on the DMOUT pin and

know that it is connected to a DCP.

Optional Secondary Detection - If the portable

device drives 0.6V (nominal) onto the DMOUT

pin, the UCS81003 will take no other action than

to leave the resistor connected between DPOUT

and DMOUT. This will cause the portable device

to see 0.6V (nominal) on the DPOUT pin and

know that it is connected to a DCP.

9.8

Dedicated Charger

When commanded to Dedicated Charger Emulation

cycle mode, the UCS81003 enables an attached

portable device to enter its charging mode by applying

specific charger emulation profiles in a predefined

sequence. Using these profiles, the UCS81003 is

capable of generating and recognizing several signal

levels on the DPOUT and DMOUT pins. The preloaded

charger emulation profiles include ones compatible

with YD/T-1591 (2009), 12W charging, Samsung and

many RIM portable devices. Other levels, sequences

and protocols are configurable via the SMBus/I2C.

When a charger emulation profile is applied, a

programmable timer for the emulation profile is started.

When emulation timeout occurs, the UCS81003

checks the IBUS current against a programmable

threshold. If the current is above the threshold, the

charger

emulation

profile

accepted

and

the

associated current limiting mode is applied. No active

USB data communication is possible when charging in

this mode (by default - see Section 10.4.5 “High-

Speed Switch Configuration Register”).

Note 1: BC1.2 compliance testing may require

the S0 control to be set to ‘0’ (Attach and

Removal Detection feature disabled)

while testing is in progress.

2: When the UCS81003 is in BC1.2 CDP

mode and the Attach and Removal

Detection feature is enabled, if a power

thief (such as a USB light or fan) attaches

but does not assert DP pin, a Removal

event will not occur when the portable

device

removed.

However,

standard USB device is subsequently

attached, Removal Detection will again

be fully functional. As well, if PWR_EN is

cycled or M1, M2 and/or EM_EN change

state, a Removal event will occur and

Attach Detection will be reactivated.

Note:

All CDP handshaking is performed with

the high-speed switch closed.

Note:

BC1.2 compliance testing may require the

S0 control to be set to ‘0’ (Attach and

Removal

Detection

feature

disabled)

while testing is in progress.

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