UCS1002-2 datasheet(81/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

Bit 0 - LATCH_SET - In SMBus mode, controls the fault handling routine that is used in the case that

an error is detected (see Section 5.3.5, "Latch Input").



‘0’ (default) - The UCS1002 will automatically retry when an error condition is detected.



‘1’ - The UCS1002 will latch its error conditions. In order for the device to return to normal Active

state, the ERR bit must be cleared by the user.

10.4.4

Attach Detection Configuration - 18h

The contents of this register are retained in Sleep.

Bit 7 - RESERVED - Do not change. This bit will read ‘0’ and should not be written to a logic ‘1’.

Bit 6 - RESERVED - Do not change. This bit will read ‘1’ and should not be written to a logic ‘0’.

Bit 5 - RESERVED - Do not change. This bit will read ‘0’ and should not be written to a logic ‘1’.

Bit 4 - RESERVED - Do not change. This bit will read ‘0’ and should not be written to a logic ‘1’.

Bits 3 - 2 - DISCHG_TIME_SEL[1:0] - Sets the tDISCHARGE time as shown in Table 10.9.

Bits 1 - 0 - ATT_TH[1:0] - Determines the Attach Detection threshold (IDET_QUAL) and Removal

Detection thresholds (IREM_QUAL_DET and IREM_QUAL_ACT) as shown in Table 10.10.

APPLICATION NOTE: The removal threshold is different when operating in the Active power state versus when

operating in the Detect power state.

Table 10.9 Discharge Time Options

DISCHG_TIME_SEL[1:0]

TDISCHARGE

100 ms

200 ms (default)

300 ms

400 ms

Table 10.10 Attach / Removal Detection Threshold Options

ATT_TH[1:0]

ATTACH THRESHOLD /

REMOVAL THRESHOLD

(DETECT STATE)

REMOVAL THRESHOLD

(ACTIVE STATE)

200

μA100 μA

400

μA

300

μA

800

μA (default)

700

μA (default)

1000

μA

900

μA

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