MON35W42 datasheet(22/60 Pages) SMSC

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Temperature sensor 1 nSMI interrupt modes:

(1) Comparator Interrupt Mode

Setting the THYST (Temperature Hysteresis) limit to 127°C will set temperature sensor 1 nSMI to the

Comparator Interrupt Mode. Temperatures which exceed TO (Over Temperature) Limit cause an

interrupt. This interrupt is reset by reading the Interrupt Status Register. Once an interrupt event has

occurred by exceeding TO, and then reset, if the temperature remains above the TO, the interrupt will

occur again when the next conversion has completed. If an interrupt event has occurred by exceeding

TO and is not reset, the interrupts will not occur again. The interrupts will continue to occur in this

manner until the temperature goes below TO. (Figure 16-1)

(2) Two-Times Interrupt Mode

Setting the THYST lower than TO will set temperature sensor 1 nSMI to the Two-Times Interrupt Mode.

The Temperature exceeding TO causes an interrupt and then the temperature going below THYST also

causes an interrupt if the previous interrupt has been reset by reading the interrupt Status Register.

Once an interrupt event has occurred by exceeding TO, then reset, if the temperature remains above

the THYST , additional interrupts will not occur. (Figure 15-2)

TOI

FIGURE 15-1 - COMPARATOR INTERRUPT MODE

*Interrupt Reset when Interrupt Status Registers are read

TOI

THYST

FIGURE 15-2 - TWO-TIMES INTERRUPT MODE

nSMI

THYST

127'C

MON35W42 Datasheet(PDF) 22 Page - SMSC Corporation