UCS1002-2 datasheet(57/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

voltage (on VBUS), back-voltage (VBUS to VS or VBUS to VDD), discharge error, and maximum

allowable internal die temperature (TTSD) exceeded (see Section 5.1.5, "Error State Operation").

7.6.1

Auto-recovery Fault Handling

When the LATCH control is low, auto-recovery fault handling is used. When an error condition is

detected, the UCS1002 will immediately enter the Error state and assert the ALERT# pin (see

Section 5.1.5). Independently from the host controller, the UCS1002 will wait a preset time (tCYCLE),

check error conditions (tTST), and restore Active operation if the error condition(s) no longer exist. If

all other conditions that may cause the ALERT# pin to be asserted have been removed, the ALERT#

pin will be released.

7.6.2

Latched Fault Handling

When the LATCH control is high, latch fault handling is used. When an error condition is detected, the

UCS1002 will enter the Error power state and assert the ALERT# pin. Upon command from the host

controller (by toggling the PWR_EN control from enabled to disabledor by clearing the ERR bit via

SMBus), the UCS1002 will check error conditions once and restore Active operation if error conditions

no longer exist. If an error condition still exists, the host controller is required to issue the command

again to check error conditions.

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