UCS1002-3 datasheet(43/114 Pages) MICROCHIP

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DS20006852A-page 43

UCS1002-3

9.9

Current Limit Mode Associations

The UCS1002-3 closes the port power switch and uses

the Current Limiting mode as shown in Table 9-2.

9.10

No Handshake

In DCE Cycle mode with emulation retry disabled, a

“No Handshake” condition is flagged. The NO_HS

status bit stays set (see Register 10-5) when the end of

the DCE Cycle is reached without a handshake and

without drawing current.

All signatures/handshaking placed on the DPOUT and

DMOUT pins are removed. The UCS1002-3 operates

with the high-speed switch opened or closed as

determined by the high-speed switch configuration and

uses Trip or Constant Current Limiting as determined

by the IBUS_R2MIN setting (CS_R2_IMIN[2:0] bits 4-2 in

the Custom Current Limiting Behavior Configuration

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

The following charger emulation profiles are resident to

the UCS1002-3:

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

• Legacy 2 Charger Emulation Profile

• Legacy 5 Charger Emulation Profile

• Legacy 7 Charger Emulation Profile

• BC1.2 CDP Charger Emulation Profile

• BC1.2 DCP 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 Section 9.12 “Custom

Charger Emulation Profile”.

9.11.1

BC1.2 DCP CHARGER EMULATION

PROFILE WITHIN DCE CYCLE

When the BC1.2 DCP charger emulation profile

(Section 9.7.1 “BC1.2 DCP Charger Emulation Pro-

file”) is applied within the DCE Cycle (Dedicated Char-

ger Emulation Cycle is selected as the Active mode),

TABLE 9-2:

CURRENT LIMIT MODE OPTIONS

Active Mode

Current Limit Mode

(See Section 10.14 “Current Limiting Behavior

Configuration Registers”)

Data Pass-Through

Trip mode

BC1.2 SDP

Trip mode

BC1.2 CDP