MON35W42 datasheet(23/60 Pages) SMSC

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Temperature sensor 2 and sensor 3 nSMI interrupt

Temperature sensor 2 and sensor 3 nSMI interrupt have two modes of operation and are programmed

at CR[4Ch] bit 6.

(1) Comparator Interrupt Mode

Temperatures exceeding TO cause an interrupt. This interrupt is reset by reading the Interrupt Status

remains above the THYST, the interrupt occurs again when the next conversion has completed. If an

interrupt event has occurred by exceeding TO and is not reset, the interrupt will not occur again. The

interrupt continues to occur in this manner until the temperature goes below THYST. (Figure 16-1)

(2) Two-Times Interrupt Mode

Temperatures exceeding TO cause an interrupt and then when the temperature going below THYST it will

also cause an interrupt if the previous interrupt has been 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 THYST , the interrupt will not re-occur. (Figure 16-2)

TOI

THYST

*Interrupt Reset when Interrupt Status Registers are read

TOI

THYST

nSMI

FIGURE 16-1 - COMPARATOR INTERRUPT MODE

FIGURE 16-2 - TWO-TIMES INTERRUPT MODE

MON35W42 Datasheet(PDF) 23 Page - SMSC Corporation