UCS1003-2 datasheet(57/138 Pages) MICROCHIP

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DS20005346B-page 57

UCS1003-1/2/3

9.10

No Handshake (UCS1003-1 only)

In DCE Cycle mode with emulation retry disabled, a

“no handshake” condition is flagged. The NO_HS

status bit stays set when the end of the DCE Cycle is

reached without a handshake and without drawing

current (see Register 10-5).

All signatures/handshaking placed on the DPOUT and

DMOUT pins are removed. The UCS1003-1 will operate

with the high-speed switch opened or closed, as deter-

mined by the high-speed switch configuration, and will

use Trip or Constant-Current Limiting as determined by

the IBUS_R2MIN setting (CS_R2_IMIN<2:0> bits, Custom

Current-Limiting Behavior Configuration<4:2>).

The portable devices that can cause this are generally

the ones that pull up DPOUT to some voltage and leave

it there or apply the wrong voltage.

9.11

Preloaded Charger Emulation

Profiles in UCS1003-1

The following charger emulation profiles are resident to

the UCS1003-1:

• BC1.2 DCP Charger Emulation Profile within DCE

Cycle

• Legacy 2 Charger Emulation Profile

• Legacy 1, 3, 4 and 6 Charger Emulation Profiles

• Legacy 5 Charger Emulation Profile

• Legacy 7 Charger Emulation Profile

• BC1.2 CDP Charger Emulation Profile

• BC1.2 DCP Charger Emulation Profile

9.11.1

BC1.2 DCP CHARGER EMULATION

PROFILE WITHIN DCE CYCLE

When the BC1.2 DCP charger emulation profile (see

Section 9.7.1 “BC1.2 DCP Charger Emulation Pro-

file”

) is applied within the DCE Cycle (dedicated charger

emulation cycle is selected as the Active mode), the

behavior after the profile is applied differentiates from the

Active mode BC1.2 DCP (BC1.2 DCP in Table 9-1)

because the tEM_TIMEOUT timer is enabled (by default)

during the DCE Cycle.

During the DCE Cycle, after the DCP charger

emulation profile is applied, the UCS1003-1 will

perform one of the following:

If the portable device is drawing more than

IBUS_CHG current when the tEM_TIMEOUT timer

expires, the UCS1003-1 will flag that a BC1.2

DCP was detected. The UCS1003-1 will leave in

place the resistive short, leave the high-speed

switch open and then enable Constant-Current

Limiting (variable slope).

If the portable device does not draw more than

IBUS_CHG current when the tEM_TIMEOUT timer

expires, the UCS1003-1 will stop applying the

DCP charger emulation profile and proceed to the

next charger emulation profile in the DCE Cycle.

9.11.2

LEGACY 2 CHARGER

EMULATION PROFILE

The Legacy 2 charger emulation profile does the

following:

The UCS1003-1 will connect a 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 UCS1003-1 will accept

that this is the correct charger emulation profile

for the attached portable device and 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 the tEM_TIMEOUT timer

expires, the UCS1003-1 will stop the Legacy 2

charger emulation. This will cause the resistive

short between the DPOUT and DMOUT pins to be

removed. Emulation Reset occurs and UCS1003-1

will initiate the next charger emulation profile.

9.11.3

LEGACY 1, 3, 4 AND 6 CHARGER

EMULATION PROFILES

Legacy 1, 3, 4 and 6 charger emulation profiles follow

the same pattern of operation, although the voltage that

is applied on the DPOUT and DMOUT pins will vary. They

do the following:

The UCS1003-1 will apply a voltage on the DPOUT

pin using either a current-limited voltage source or

a voltage divider between VBUS and ground, with

the center tap on the DPOUT pin.

The UCS1003-1 will apply a possibly different

voltage on the DMOUT pin, using either a current-

limited voltage source or a voltage divider

between VBUS and ground, with the center tap

on the DMOUT pin.

VBUS voltage is applied.

If the portable device draws more than IBUS_CHG

current when the tEM_TIMEOUT timer expires, the

UCS1003-1 will accept that the currently applied

profile is the correct charger emulation profile for

the attached portable device; charging com-

mences. The voltages applied to the DPOUT and

DMOUT pins will remain in place (unless

EM_RESP is set to ‘0b’). The UCS1003-1 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 the tEM_TIMEOUT timer

expires, the UCS1003-1 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

UCS1003-1 will initiate the next charger emulation

profile.

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