AMC6821 datasheet(39/57 Pages) TI2

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DEVICE STATUS REGISTERS

AMC6821

SBAS386C – MAY 2006 – REVISED JULY 2007

Reading the status registers clears the appropriate status bit. Status register bits are sticky (except the RTF bit).

Whenever a status bit is set, indicating an out-of-limit condition, it remains set until the event that caused it is

resolved and the status register is read. The status bit can only be cleared by reading the status register after the

event is resolved. All bits are cleared when reading the register, and all bits are reasserted if the out-of limit

condition still exists on the next monitoring cycle, unless otherwise noted.

Status Register 1 (Address 0x02, Value After Power-On or Reset = 0x00)

BIT

NAME

R/W

DEFAULT

DESCRIPTION

LTL = 1 when the local temperature is less than or equal to the value of the

LTL

Local-Low-Temp-Limit register. Otherwise, LTL = 0. If the local temperature is still

outside the local temperature low limit, this bit reasserts on the next monitoring cycle.

LTH = 1 when the local temperature is greater than or equal to the value of the

LTH

Local-High-Temp-Limit register. Otherwise, LTH = 0. If the local temperature is still

outside the local temperature high limit, this bit reasserts on the next monitoring cycle.

Remote sensor-failure interrupt. RTF = 1 when the remote temperature sensor fails

(short- or open-circuit). RTF = 0 when the remote sensor is in normal condition. When

RTF = 1, the OVR pin is asserted and the remote temperature data register is set to

–128

°C.

RTF

RTF = 1 also generates an interrupt through the SMBALERT pin if an interrupt is

enabled (RTFIE = 1). Once RTF is set ('1'), it always remains ('1') until power-on reset or

software reset occurs, whether or not the failure condition continues. Reading the status

Remote temperature over the remote THERM limit flag. R-THERM = 1 when the

temperature is greater than the value of the Remote-THERM-Limit register. Otherwise,

R-THERM = 0. When R-THERM = 1, the THERM pin goes low. It also generates a

R-THERM

THERM interrupt if THERMOVIE = 1. This bit is cleared on a read of Status Register 1.

Once cleared, this bit is not reasserted until the remote temperature falls 5

°C below this

THERM limit, even if the THERM condition persists. Refer to the THERM Pin and

External Hardware Control section.

RTL = 1 when the remote temperature is less than or equal to the value of the

RTL

Remote-Low-Temp-Limit register. Otherwise, RTL = 0. If the remote temperature is still

beyond the remote temperature low limit, this bit reasserts on the next monitoring cycle.

RTH = 1 when the remote temperature is greater than or equal to the value of

RTH

Remote-High-Temp-Limit register. Otherwise, RTH = 0. If the remote temperature is still

beyond the remote temperature high limit, this bit reasserts on the next monitoring cycle.

Fan-slow flag. FANS = 1 if the TACH data are greater than or equal to the value of the

TACH-Low-Limit register. This bit indicates if the fan becomes stuck or goes under the

minimum speed. FANS = 0 if the TACH data are smaller than the TACH low limit. This

bit is cleared ('0') only after reading this register, and reasserts '1' in the next monitoring

if a fan-slow is detected. After spin-up, FANS is set ('1') even if the TACH data are less

FANS

than the TACH low limit until the register is read. FANS = 1 generates a fan out-of-range

interrupt through the SMBALERT pin if fan out-of-range is enabled (FANIE = 1). Five

consecutive fan-slow events result in a FAN FAILURE status; which asserts the

FAN-FAULT pin low. See the FAN-FAULT PIN section for details. Note that a FANS

(fan-slow) detection is not performed during spin-up.

RPM-ALARM = 1 when the TACH data are less than or equal to the value of the

TACH-High-Limit register. This means the RPM is over the maximum limit defined by the

TACH high limit. Otherwise, RPM-ALARM = 0. This bit is cleared when reading this

RPM-ALARM

condition still persists. This bit may be reasserted only if the RPM drops below the

allowed maximum speed. RPM-ALARM = 1 generates a fan out-of-range interrupt

through the SMBALERT pin if fan out-of-range is enabled (FANIE = 1), but does not

cause an interrupt through the FAN-FAULT pin.

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