TMP126 datasheet(16/48 Pages) TI

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8.4.4.1 Interrupt Mode

When the INT_COMP bit in the Configuration register is set to 0, the device is in interrupt mode. Changing

the device to Interrupt mode from Comparator mode will immediately clear the Alert_Status register and

reset the ALERT pin. The TMP126-Q1 will then behave as described in this section at the next temperature

conversion. In this mode, the device compares the temperature result at the end of every conversion with the

values in the TLow_Limit register and THigh_Limit register. If the temperature result is higher the value in the

THigh_Limit register, the THigh_Status and THigh_Flag bits in the Alert_Status register will be set and the

ALERT pin will assert. After a read of the Alert_Status register the flag bit will clear and the ALERT pin will

de-assert. Subsequent temperature results above the hysteresis value (THigh_Limit - THigh_Hysteresis), where

THigh_Hysteresis is the Most Significant Byte (MSB) in the Hysteresis register, will not set the THigh_Flag bit.

The status bit will not clear until a temperature result is below (THigh_Limit - THigh_Hysteresis).

After a temperature result below (THigh_Limit - THigh_Hysteresis), the THigh_Status bit will clear, the

THigh_Flag bit will be set, and the ALERT pin will be asserted to indicate the change.

If the THigh_Flag bit is not enabled in the Alert_Enable register, the flag bit will be set when the measured

temperature crosses the THigh_Limit or hysteresis but the ALERT pin will not assert. The behavior for the

TLow_Limit and Slew rate will be the same as the previously described high limit. Figure 8-7 shows a diagram

depicting the behavior.

THigh_Limit

TLow_Limit

Temperature

Temperature conversions

THigh_Status

THigh_Flag

SPI Read

ALERT

THigh_Limit ± THigh_Hyst

TLow_Limit + TLow_Hyst

TLow_Status

TLow_Flag

Slew_Status

Slew_Rate_Limit

Slew_Flag

Figure 8-7. Interrupt Mode Diagram

TMP126-Q1

SNIS227C – MAY 2021 – REVISED JUNE 2022

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TMP126 Datasheet(PDF) 16 Page - Texas Instruments