UCS81003 datasheet(58/108 Pages) MICROCHIP

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UCS81003

DS20005334A-page 58

 2014 Microchip Technology Inc.

10.4.4

ATTACH DETECTION

CONFIGURATION RESISTER

The contents of this register are retained in Sleep.

bit 2

S0_SET: In SMBus mode, enables the Attach and Removal Detection feature and affects the power

state (see Section 9.2 “Active Mode Selection”).

Detection is enabled. Also see Table 5-2.

= Detection is not enabled. Also see Table 5-2.

bit 1

PWR_ENS: Controls whether the port power switch may be turned on or not and affects the power state

(see Section 5.3.4 “PWR_EN Input”). This bit is OR’d with the PWR_EN pin and the polarity of both

are controlled by SEL pin decode. Thus, if the polarity is set to active high, either the PWR_EN pin or

this bit must be ‘1’ to enable the port power switch.

bit 0

LATCHS: 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”).

The UCS81003 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.

= The UCS81003 will automatically retry when an error condition is detected.

R/W-0

R/W-1

R/W-0

R/W-1

R/W-0

RESERVED

DISCHG_TIME_SEL<1:0>

ATT_TH<1:0>

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

RESERVED: Do not change.

bit 3-2

DISCHG_TIME_SEL<1:0>: Sets the tDISCHARGE time as follows:

= 100 ms

= 200 ms

= 300 ms

= 400 ms

bit 1-0

ATT_TH<1:0>: Determines the Attach Detection threshold (IDET_QUAL) and Removal Detection thresh-

olds (IREM_QUAL_DET and IREM_QUAL_ACT) as shown below. (Note 1)

= 200 µA Attach, 100 µA Removal Threshold

= 400 µA Attach, 300 µA Removal Threshold

= 800 µA Attach, 700 µA Removal Threshold

= 1000 µA Attach, 900 µA Removal Threshold

Note 1:

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

Detect power state.

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