W83791D Datasheet, PDF (34/46 Pages) Winbond – W83791D Winbond H/W Monitoring IC

W83791D
High limit
Low limit
Preliminary
Fan Count limit
SMI#
*
*
*
*
SMI#
*Interrupt Reset when Interrupt Status Registers are read
*
*
Figure 12-1. Voltage SMI# Mode
Figure 12-2. Fan SMI# Mode
6.8.5
SMI# interrupt for W83791D temperature sensor 1/2/3
(1) Comparator Interrupt Mode
Temperature exceeding T_O 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_HYST, the interrupt will occur again when the next conversion has completed. If an interrupt event has occurred by
exceeding T_O but has not been reset, the interrupts will not occur again. The interrupts will continue to occur in this
manner until the temperature goes below T_HYST. (Figure 12-3.)
(2) 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 12-4.)
(3) One-Time interrupt mode
Temperature exceeding T_O causes an interrupt and then temperature going below T_HYST will not cause an interrupt.
Once an interrupt event has occurred by exceeding T_O, then going below T_HYST, an interrupt will not occur again
until the temperature exceeding T_O. (Figure 12-5.)
27
Publication Release Date: Aug, 2001
Revision 0.41