UCS81003 datasheet(51/108 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS20005334A-page 51

UCS81003

bit 0

OV_LIM: Indicates that the IBUS current has exceeded both the ILIM threshold and the IBUS_R2MIN thresh-

old settings. This bit will be cleared when read if the error condition has been removed or if the ERR bit

is cleared. This bit will cause the ALERT# pin to be asserted and the device to enter the Error state.

=IBUS > ILIM and IBUS_R2MIN

=IBUS has not exceeded both ILIM threshold and the IBUS_R2MIN threshold settings

Note 1:

If the Auto-Recovery fault handling is not used, the ERR bit must be written to a logic '0' to be cleared. It

will also be cleared when the PWR_EN control is disabled.

Note that the ERR bit does not necessarily reflect the ALERT# pin status. The ALERT# pin may be

cleared or asserted without the ERR bit changing states.

GENERAL STATUS REGISTER (ADDRESS 11H)

R-0

U-x

R-0

R-C

RATION

—

CC_MODE

TREG

LOW_CUR

REM

ATT

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

C = Clear on Read

bit 7

RATION: Indicates that the UCS81003 has delivered the programmed amount of power to a portable

device. If the RATION_BEH bits are set to interrupt the host, this bit will cause the ALERT# pin to be

asserted. This bit is cleared when read. This bit is also cleared automatically when the RTN_RST bit is

set or the RTN_EN bit is cleared (see Section 10.4.1 “General Configuration Register”).

UCS81003 has delivered the programmed amount of power to a portable device

UCS81003 has not delivered the programmed amount of power to a portable device

bit 6-5

Unimplemented

bit 4

CC_MODE: Indicates that the IBUS current has exceeded ILIM. Current is in Region 2 (IBUS_R2MIN).

=IBUS > ILIM

=IBUS < ILIM

bit 3

TREG: Indicates that the internal temperature has exceeded TREG and that the current limit has been

reduced. This bit is cleared when read and will not cause the ALERT# pin to be asserted, unless the

ALERT_LINK bit is set.

Internal temperature > TREG

Internal temperature < TREG

bit 2

LOW_CUR: Indicates that a portable device has reduced its charge current to below ~6.4 mA and may

be finished charging. This bit is cleared when read and will not cause the ALERT# pin to be asserted,

unless the ALERT_LINK bit is set.

=IBUS < 6.4 mA

=IBUS > 6.4 mA

bit 1

REM: Indicates that a Removal Detection event has occurred and there is no longer a portable device

present. This bit is cleared when read and will not cause the ALERT# pin to be asserted. It will cause

the A_DET# pin to be released.

Removal Detected

No Removal Detected

bit 0

ATT: Indicates that an Attach Detection event has occurred and there is a new portable device present.

This bit is cleared when read and will not cause the ALERT# pin to be asserted. It will cause the A_DET#

pin to be asserted.

Attach Detected

No Attach Detected

INTERRUPT STATUS REGISTER (ADDRESS 10H) (CONTINUED)

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