UCS81003 datasheet(62/108 Pages) MICROCHIP

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UCS81003

DS20005334A-page 62

 2014 Microchip Technology Inc.

10.8

IBUS_CHG Configuration Register

The

IBUS_CHG

Configuration

sets

the

IBUS_CHG current value. If current greater than

IBUS_CHG is detected flowing out of VBUS, emulation is

successful. The bit weights are in mA, and the range is

from 11.72 mA to 175.8 mA.

The contents of this register are not retained in Sleep.

10.9

TDET_CHARGE Configuration

The TDET_CHARGE Configuration register controls

the tDC_TEMP and tDET_CHARGE timing. The tDC_TEMP

timer is started whenever the temperature exceeds

TREG. This timer is meant to give the system time to

cool at the lower ILIM setting before changing ILIM

again. The tDET_CHARGE timer is started whenever the

VBUS voltage is discharged and the bypass switch is

re-activated. This timer is meant to be a delay to allow

the VBUS capacitor to charge before detecting an

Attach Detection event.

If tDET_CHARGE time is increased greater than 800 ms,

larger

bus

capacitors

can

accommodated;

however, with a portable device present and PWR_EN

disabled, a Removal Detection event and then another

Attach Detection event will occur.

The contents of this register are retained in Sleep.

Name

Bits

Address

Cof

Default

IBUS_CHG

Configuration

81Eh

R/W

0Fh

U-x

R/W-1

—

ICHG<3>

ICHG<2>

ICHG<1>

ICHG<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 7-4

Unimplemented

bit 3-0

ICHG<3:0>

1 LSB = 11.72 mA

Name

Bits

Address

Cof

Default

TDET_CHARGE

Configuration

81Fh

R/W

03h

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