W83791G Datasheet, PDF (32/99 Pages) Winbond – Winbond H/W Monitoring IC

W83791D/G
6.8.4 SMI# interrupt for W83791D Fan
SMI# interrupt for fan is Two-Times Interrupt Mode. Fan count exceeding the limit, or exceeding and
then going below the limit (set at value ram index 3Bh and 3Ch), will causes an interrupt if the
previous interrupt has been reset by reading all the interrupt Status Register. (Figure 12-2)
High limit
Low limit
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/G 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)
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Publication Release Date: April 14, 2006
Revision 1.1