UCS1003-2 datasheet(54/138 Pages) MICROCHIP

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UCS1003-1/2/3

DS20005346B-page 54

 2014-2015 Microchip Technology Inc.

The UCS1003-1/2/3 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 UCS1003-1/2/3 will drive 0.6V

onto the DMOUT pin within 20 ms.

When the portable device drives the DPOUT pin

back to ‘0’, the UCS1003-1/2/3 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 UCS1003-1/2/3 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,

UCS1003-1/2/3 will discharge VBUS and apply the

BC1.2 DCP charger emulation profile per the

specification. In BC1.2 DCP mode, the emulation time-

out and requirement for portable device current draw

are automatically disabled. In the case of UCS1003-1,

when the BC1.2 DCP charger emulation profile is

applied within the Dedicated Charger Emulation Cycle

mode (see Section 9.11.1 “BC1.2 DCP Charger

Emulation Profile within DCE Cycle”

), the time-out

and current draw requirement are enabled.

If the portable device is charging after the DCP charger

emulation profile is applied, the UCS1003-1/2/3 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

UCS1003-1/2/3 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 UCS1003-1/2/3 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 Emulation

Cycle

When commanded to Dedicated Charger Emulation

Cycle mode, the UCS1003-1/2/3 family enables an

attached portable device to enter its Charging mode by

applying specific charger emulation profiles in a

predefined sequence. Using these profiles, the

UCS1003-1/2/3 family is capable of generating and

recognizing several signal levels on the DPOUT and

DMOUT pins. The preloaded charger emulation profiles

include those compatible with YD/T-1591 (2009), 12W

charging, Samsung and many RIM portable devices. In

the case of UCS1003-1, 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 time-out occurs, the UCS1003-1/2/3

family checks the IBUS current against a programmable

threshold. If the current is above the threshold, the

charger emulation profile is 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.

When the UCS1003-1/2/3 devices are 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 the DP pin,

a removal event will not occur when the

portable device is removed. However, if a

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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