UCS81003 datasheet(93/108 Pages) MICROCHIP

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DS20005334A-page 93

UCS81003

10.14.2

CUSTOM CURRENT LIMITING

BEHAVIOR CONFIGURATION

The Custom Current Limiting Behavior Configuration

allows

programming

current

limit

parameters. These controls are used when a portable

device

handshakes

using

the

Legacy

charger

emulation profiles (except Legacy 3), the Custom

charger emulation profile, or does not handshake as a

dedicated charger (i.e., a power thief).

The contents of this register are retained in Sleep.

R/W-1

R/W-0

U-x

R/W-0

R/W-1

R/W-0

CS_VBUS_MIN<1:0>

—

CS_R2_IMIN<2:0>

RESERVED

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-6

CS_VBUS_MIN<1:0>: Defines the Custom VBUS_MIN voltage as shown below. Note that VBUS_MIN is

checked even when operating with Trip Current Limiting.

1.5V

1.75V

2.0V

2.25V

bit 5

Unimplemented

bit 4-2

CS_R2_IMIN<2:0>: Define the Custom IBUS_R2MIN threshold as shown below. The default is 120 mA.

This value is used under the following conditions: when a portable device handshakes using the Legacy

charger emulation profiles (except Legacy 3) the Custom charger emulation profile or when it does not

handshake in DCE Cycle (i.e., a power thief). Under these conditions, the current limiting mode is deter-

mined by the relative value of IBUS_R2MIN and ILIM. When IBUS_R2MIN < ILIM or ILIM > 1.68 A, Trip Current

Limiting used; otherwise, CC mode is used.

Define the IBUS_R2MIN current as follows:

000

= 120 mA

001

= 570 mA

010

= 1000 mA

011

= 1350 mA

100

= 1680 mA

101

= 2050 mA

bit 1-0

RESERVED: Do not change.

Note 1:

The values specified above are the typical ones..

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