W83L784R_05 Datasheet, PDF (23/52 Pages) Winbond – Monitoring IC

W83L784R/ W83L784G
6.5.4 Fan Fault Alarm
W83L784R/G can monitor fan speed by detecting fan speed counter value. When fan speed count is
higher than high limit count value (CR58h) or less than low limit count value (CR59h), pin
FANFAULT# is asserted.
6.6 SMI#
6.6.1 Temperature
Pin SMI# for temperature has 3 modes.
6.6.1.1. Comparator Interrupt Mode
Temperature exceeding T_O causes an interrupt and this interrupt will be reset by reading all the
Interrupt Status Registers. 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 and not reset, the interrupts will not
occur again. The interrupts will continue to occur in this manner until the temperature goes below
T_HYST. (Figure 19-1)
6.6.1.2. 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 19-2)
- 18 -
Publication Release Date: Jan. 2005
Revision 1.1