UCS1003-3 datasheet(48/138 Pages) MICROCHIP

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UCS1003-1/2/3

DS20005346B-page 48

 2014-2015 Microchip Technology Inc.

If the RTN_EN control bit is set to ‘0’ prior to reaching

the charge rationing threshold, rationing will be dis-

abled and the Total Accumulated Charge registers will

be cleared. If the RTN_EN bit is set to ‘0’ after the

charge rationing threshold has been reached, the

following will be done:

RATION status bit will be cleared.

The ALERT# pin will be released if asserted by

the rationing circuitry and no other conditions

are present.

The M1, M2, EM_EN, S0 and PWR_EN controls

are checked to determine the power state. See

Note 1

in Table 7-4.

Setting the RTN_RST control bit to ‘1’ will automatically

reset the Total Accumulated Charge registers to

00_00h. If this is done prior to reaching the charge

rationing threshold, the data will continue to be accu-

mulated, restarting from 00_00h. If this is done after the

charge rationing threshold is reached, the UCS1003-1

will take action, as shown in Table 7-3.

7.5

Fault Handling Mechanism

The UCS1003-1/2/3 has two modes for handling

Faults:

• Latch (latch-upon-Fault)

• Auto-Recovery (automatically attempt to restore

the Active power state after a Fault occurs).

If the SMBus is actively utilized, auto-recovery Fault

handling is the default error handler, as determined by

the LATCHS bit (see Section 10.4.3 “Switch

Configuration

). Otherwise, the Fault

handling mechanism used depends on the state of the

LATCH pin. Faults include overcurrent, overvoltage (on

VS), undervoltage (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”).

7.5.1

AUTO-RECOVERY FAULT

HANDLING

When the LATCH control is low, auto-recovery Fault

handling is used. When an error condition is detected,

the UCS1003-1/2/3 will immediately enter the Error

state and assert the ALERT# pin (see Section 5.1.5

“Error State Operation”

). Independently from the host

controller, the UCS1003-1/2/3 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.

Note:

If the rationing behavior was set to “Report

and Disconnect” when the charge rationing

threshold was reached, and then the

RTN_EN bit is cleared, the portable device

may start charging sub-optimally because

the charger emulation profile has been

removed. Toggle the PWR_EN control to

restart charger emulation.

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