W83637HF Datasheet, PDF (41/149 Pages) Winbond – LPC I/O

W83637HF
T_OI
T_HYST
SMI#
*
*
*Interrupt Reset when Interrupt Status Registers are read
Figure 6.13
6.6.4 The W83637HF temperature sensor 2(CPUTIN) and sensor 3(VTIN) 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 6.14)
(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 6.15)
T_OI
T_OI
T_HYST
T_HYST
SMI#
*
*
**
SMI#
*
*
*
*
Figure 6.14
*Interrupt Reset when Interrupt Status Registers are read
Figure 6.15
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Publication Release Date: June 25, 2003
Revision 1.3