W83627THF_06 Datasheet, PDF (39/142 Pages) Winbond – Winbond LPC I/O

W83627THF/W83627THG
5.6.3 The W83627THF temperature sensor 1(SYSTIN) SMI# interrupt has 3 modes:
(1) Comparator Interrupt Mode
Setting the T_HYST (Temperature Hysteresis) limit to 127°C will set temperature sensor 1 SMI# to the
Comparator Interrupt Mode. Temperature exceeds T_O (Over Temperature) Limit 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_O , 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_O. (Figure 5-14 ) .
Setting the T_HYST lower than T_O will set temperature sensor 1 SMI# to the Interrupt Mode. The
following are two kinds of interrupt modes, which are selected by Index 4Ch bit5 :
(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 5-15 )
(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 5-16 )
THYST
127'C
TOI
TOI
THYST
SMI#
SMI#
** *
*
*
*Interrupt Reset when Interrupt Status Registers are read
*
*
Figure 5-14
Figure 5-15
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