UCS1002-2 datasheet(83/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

Bits 2 - 0 - ILIM_SW[2:0] - Sets the ILIM value as shown in Table 10.12.

10.6

Charge Rationing Threshold Registers

The Charge Rationing Threshold registers set the maximum allowed charge that will be delivered to a

portable device. Every time the Total Accumulated Charge registers are updated, the value is checked

against this limit. If the value meets or exceeds this limit, the RATION bit is set (see Section 10.4.1)

and action taken according to the RATION_BEH[1:0] bits (see Section 10.4.1).

The units are in mA-hrs with a range from 0 to ~181768.

The contents of this register are retained in Sleep.

Table 10.12 ILIM_SW Bit Decode

ILIM_SW[2:0]

ILIM

210

000

500 mA

001

900 mA

010

1.0 A

011

1.2 A

100

1.5 A

101

1.8 A

110

2.0 A

111

2.5 A

Table 10.13 Charge Rationing Threshold Registers

ADDR

R/W

DEFAULT

1Ah

R/W

Charge

Rationing

Threshold

High Byte

90968

45484

22742

11371

5685

2843

1421

710.7

FFh

1Bh

R/W

Charge

Rationing

Threshold

Low Byte

355.4

177.7

88.84

44.42

22.21

11.105

5.552

2.776

FFh

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