UCS1002-2 datasheet(86/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.4 (07-16-13)

SMSC UCS1002

DATASHEET

The contents of this register are retained in Sleep.

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.

Bits 4 - 3 - DC_TEMP_SET[2:0] - Determines the tDC_TEMP time as shown in Table 10.20.

Bits 2 - 0 - DET_CHARGE_SET[2:0] - Determines the tDET_CHARGE time as shown in Table 10.21.

APPLICATION NOTE: If tDET_CHARGE time is increased greater than 800 ms, larger bus capacitors can be

accommodated; however, with a portable device present and PWR_EN disabled, a Removal

Detection event and then another Attach Detection event will occur.

Table 10.20 DC_TEMP_SET Bit Decode

DC_TEMP_SET[1:0]

TDC_TEMP

200 ms (default)

400 ms

800 ms

1600 ms

Table 10.21 DET_CHARGE_SET Bit Decode

DET_CHARGE_SET[2:0]

TDET_ CHARGE

210

000

200 ms

001

400 ms

010

600 ms

800 ms (default)

100

1000 ms

101

1200 ms

110

1400 ms

111

2000 ms

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