W83783S Datasheet, PDF (22/57 Pages) Winbond – MONITORING IC

W83783S
Preliminary
6.5.1 The W83783S temperature sensor 2 SMI# interrupt has two modes:
(1) Comparator Interrupt Mode
Setting the T_HYST (Temperature Hysteresis) limit to 127øC will set temperature sensor 1 SMI# to
the Comparator Interrupt Mode. Temperature exceeds T_O (Over Temperature) Limit causes an
interrupt and this interrupt will be reset by reading all the Interrupt Status Register. Once an
interrupt event has occurred by exceeding T_O, then reset, if the temperature remains above the
T_O , the interrupt will occur again when the next conversion has completed. If an interrupt event
has occurred by exceeding T_O and not reset, the interrupts will not occur again. The interrupts
will continue to occur in this manner until the temperature goes below T_O. (Figure 15-1 )
(2) Two-Times Interrupt Mode
Setting the T_HYST lower than T_O will set temperature sensor 1 SMI# to the Two-Times Interrupt
Mode. Temperature exceeding T_O causes an interrupt and then temperature going below T_HYST
will also 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_O , then reset, if the
temperature remains above the T_HYST , the interrupt will not occur. (Figure 15-2 )
T_HYST
127'C
T_OI
T_OI
T_HYST
SMI#
SMI#
*
*
*
*
*
*Interrupt Reset when Interrupt Status Registers are read
*
*
Figure 15-1. Comparator Interrupt Mode
Figure 15-2. Two-Times Interrupt Mode
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Publication Release Date: April 1999
Revision 0.55