W83697HF/F
9.5. 3 The W83697HF temperature sensor 1 SMI# interrupt has two modes:
(1) Comparator Interrupt Mode
°
Setting the THYST (Temperature Hysteresis) limit to 127 C will set temperature sensor 1 SMI# to the
Comparator Interrupt Mode. Temperature exceeds T (Over Temperature) Limit causes an interrupt
O
and this interrupt will be reset by reading all the Interrupt Status Register. Once an interrupt event
has occurred by exceeding T , then reset, if the temperature remains above the T
, the interrupt
O
O
will occur again when the next conversion has completed. If an interrupt event has occurred by
exceeding T and not reset, the interrupts will not occur again. The interrupts will continue to
O
occur in this manner until the temperature goes below TO. (Figure 9.8 )
(2) Two-Times Interrupt Mode
Setting the THYST lower than T will set temperature sensor 1 SMI# to the Two-Times Interrupt Mode.
O
Temperature exceeding T causes an interrupt and then temperature going below T
will also
O
HYST
cause an interrupt if the previous interrupt has been reset by reading all the interrupt Status
Register. Once an interrupt event has occurred by exceeding T , then reset, if the temperature
O
remains above the THYST , the interrupt will not occur. (Figure 9.9 )
(3) One-Time Interrupt Mode
Temperature exceeding TO causes an interrupt and then temperature going below THYST will not cause
an interrupt. Once an interrupt event has occurred by exceeding T , then going below THYST an
O
interrupt will not occur again until the temperature exceeding TO . (Figure 9.9)
T
HYST
127'C
T
OI
T
OI
T
HYST
SMI# two time
SMI# one time
SMI#
*
*
*
*
*
*
*
*
*
*
*Interrupt Reset when Interrupt Status Registers are read
Figure 9.8
Figure 9.9
Publication Release Date: Feb. 2002
Revision 0.70
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