UCS1002-3 datasheet(41/114 Pages) MICROCHIP

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DS20006852A-page 41

UCS1002-3

The UCS1002-3 responds 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 as

described below.

VBUS voltage is applied.

Primary Detection – when the portable device

drives a voltage between 0.4V and 0.8V onto the

DPOUT pin, the UCS1002-3 drives 0.6V onto

the DMOUT pin within 20 ms.

When the portable device drives the DPOUT pin

back to ‘0’, the UCS1002-3 then drives 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 UCS1002-3 takes no

other action. This causes the portable device to

observe a ‘0’ on the DPOUT pin and detects the

connection to a CDP.

9.7

BC1.2 DCP

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

UCS1002-3 discharges VBUS and applies 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 9.11.2

“Legacy 2 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 UCS1002-3

leaves the resistive short in place, leaves the high-

speed switch open and enables Constant Current

Limiting (variable slope).

9.7.1

BC1.2 DCP CHARGER

EMULATION PROFILE

The BC1.2 DCP charger emulation profile is described

below.

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

UCS1002-3 takes no other action than to leave

the resistor connected between DPOUT and

DMOUT. This causes 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 UCS1002-3 takes no other action than

to leave the resistor connected between

DPOUT and DMOUT. This causes 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 UCS1002-3 enables an attached

portable device to enter its charging mode by applying

specific charger emulation profiles in a predefined

sequence. Using these profiles, the UCS1002-3 is

capable of generating and recognizing several signal

levels on the DPOUT and DMOUT pins. The preloaded

charger emulation profiles include ones compatible

with BC1.2 DCP, YD/T-1591 (2009), and most Apple

and 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 UCS1002-3

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.

2: When the UCS1002-3 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 does not occur when the portable

device is removed. However, if a

standard USB device is subsequently

attached, Removal Detection is fully

functional again. Additionally, if PWR_EN

is cycled or M1, M2 and/or EM_EN

change state, a Removal event occurs

and Attach Detection is 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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