UCS1002-3 datasheet(62/114 Pages) MICROCHIP

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UCS1002-3

DS20006852A-page 62

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10.5

Current Limit Register

The Current Limit register controls the ILIM used by the

port power switch. The default setting is based on the

resistor on the COMM_SEL/ILIM pin and this value

cannot be changed to be higher than the hardware set

value. The contents of this register are retained in Sleep.

10.6

Charge Rationing Threshold

Registers

The Charge Rationing Threshold registers set the

maximum allowed charge that is delivered to a

portable device. Whenever 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

“General Configuration Register”) and action taken

according

the

RATION_BEH[1:0]

bits

(see

Section 10.4.1 “General Configuration Register”).

The units are in mAh, with a range from 0 to ~181768.

The contents of this register are retained in Sleep.

Name

Bits Address

Cof

Default

Current Limit

19h

R/W

00h

U-x

R/W-0

—

—ILIM_SW[2:0]

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 7-3

Unimplemented

bit 2-0

ILIM_SW[2:0]: Sets the ILIM value as follows:

000

= 0.5A

001

= 0.9A

010

= 1.0A

011

= 1.2A

100

= 1.5A

101

= 1.8A

110

= 2.0A

111

= 2.5A

Note 1: Unless otherwise indicated, the values specified above are the typical ILIM in the Table 1-2.

Name

Bits Address Cof Default

Charge Rationing

Threshold High Byte

81Ah

R/W

FFh

Charge Rationing

Threshold Low Byte

81Bh

R/W

FFh

R/W-1

CHTHR[15]

CHTHR[14]

CHTHR[13]

CHTHR[12]

CHTHR[11]

CHTHR[10]

CHTHR[9]

CHTHR[8]

bit 15

bit 8

R/W-1

CHTHR[7]

CHTHR[6]

CHTHR[5]

CHTHR[4]

CHTHR[3]

CHTHR[2]

CHTHR[1]

CHTHR[0]

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

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