Datasheet

LM81
www.ti.com SNAS011E –JUNE 1999–REVISED FEBRUARY 2002
Normal Repetitive Interrupt Mode is shown in Figure 19 and operates in the following way: T_CRIT_A is
disabled. Exceeding T
HIGH
causes an interrupt that will remain active indefinitely until reset by reading Interrupt
Status Register 1. Once reset if the temperature remains above the T
HIHYST
setpoint the interrupt will again be
activated at the completion of another conversion cycle. If temperature is less than or equal to T
HIHYST
the
interrupt will not be activated.
Figure 19. Normal Repetitive Interrupt Response Diagram
Normal One-Time Interrupt Mode is shown in Figure 20 and operates in the following way: T_CRIT_A is
disabled. Exceeding T
HIGH
causes an interrupt that will remain active indefinitely until reset by reading Interrupt
Status Register 1. Another interrupt will not occur until the temperature drops to less than or equal to T
HIHYST
and
then exceeds T
HIGH
during a subsequent conversion. After power up this mode is selected as default.
Figure 20. One-Time Interrupt Response Diagram
Normal Comparator Mode is shown in Figure 21 and operates in the following way: T_CRIT_A is disabled.
Exceeding T
HIGH
causes an interrupt that will remain activated until the temperature is less than or equal to T
HIGH
.
T
LOW
is disabled.
Figure 21. Normal Comparator Mode
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