W83697HF_05 Datasheet, PDF (31/102 Pages) Winbond – LPC I/O

W83697HF
T_HYST
127'C
T_OI
T_OI
T_HYST
SMI#
*
*
*
SMI#
*
*
*
*
*Interrupt Reset when Interrupt Status Registers are read
Figure 9.8
Figure 9.9
6.5.4 The W83697HF temperature sensor 2 SMI# interrupt has two modes and it is
programmed at CR[4Ch] bit 6.
(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 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 9.10)
(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 9.11)
T_OI
T_OI
T_HYST
T_HYST
SMI#
*
*
**
SMI#
*
*
*
*
Figure 9.10
*Interrupt Reset when Interrupt Status Registers are read
Figure 9.11
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