Datasheet

LM81
SNAS011E –JUNE 1999–REVISED FEBRUARY 2002 www.ti.com
Extended Repetitive Interrupt Mode is shown in Figure 22 and operates in the following way: Once activated,
all interrupts remain activated until reset by a read of the Interrupt Status Register 1. Once activated all
T_CRIT_A interrupts remain activated until reset by a read of the Extended Mode Register 1. Temperature
conversion data less than or equal to T
LOW
will activate interrupt. Interrupt will continue to be activated until the
temperature data exceeds (T
LOW
+ T
HYST
). Exceeding T
HIGH
activates interrupt. Interrupt will continue to be
activated at the end of a conversion until the temperature data is less than or equal to (T
HIGH
− T
HYST
). T_CRIT_A
interrupts are activated when the temperature exceeds T_CRIT. T_CRIT_A interrupts will no longer be activated
if the temperature data at the end of a conversion is less than or equal to( T_CRIT − T
HYST
).
Figure 22. Extended Repetitive Interrupt Mode
Extended One-Time Interrupt Mode is shown in Figure 23 and operates in the following way: Once activated all
interrupts remain activated until reset by a read of the Interrupt Status Register 1. Once activated all T_CRIT_A
interrupts remain activated until reset by a read of the Extended Mode Register 1. An interrupt will be activated
when the data of a temperature conversion is less than or equal to T
LOW
. Interrupt cannot again be activated until
the data from a temperature conversion is greater than (T
LOW
+ T
HYST
). An interrupt will be activated when the
data of a temperature conversion is greater than T
HIGH
. Interrupt cannot again be activated until the data of a
temperature conversion is less than or equal to (T
HIGH
− T
HYST
). T_CRIT_A interrupt is activated when the data
from a temperature conversion is greater than T_CRIT. Activation of an T_CRIT_A interrupt cannot occur until
the data from a temperature conversion is less than or equal to ( T_CRIT − T
HYST
).
Figure 23. Extended One-Time Interrupt
Extended Comparator Mode is shown in Figure 24 and operates in the following way: Interrupt is activated
when the data from a temperature conversion is less than or equal to T
LOW
. Interrupt is reset when the data from
a temperature conversion exceeds (T
LOW
+ T
HIGH
). Exceeding T
HIGH
will activate interrupt. This interrupt will be
reset when data from a temperature conversion is less than or equal to (T
HIGH
− T
HYST
). T_CRIT_A interrupt is
activated when the temperature exceeds T_CRIT. T_CRIT_A remains active until the data from a temperature
conversion is less than or equal to (T_CRIT − T
HYST
) resets it.
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