TMP442 datasheet(16/63 Pages) TI2

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7.4.1.2 Comparator Mode

When the Alert Mode Setting bit in the Configuration Register is set to 1, the Alert Mode is set to Comparator

mode. In this mode, the ALERT pin is asserted at the end of a conversion cycle if the measured temperature

exceeds a High Alert Limit or goes below a Low Alert Limit defined in the limit registers. The ALERT pin

deasserts at the end of the preceding conversion cycle if the measured temperature is equal to or below a High

Alert limit minus hysteresis and equal to or above a Low Alert limit plus hysteresis defined in the limit registers.

The ALERT mask bit does not set after reading the status register in comparator mode.

The ALERT High Status flag sets at the end of a conversion cycle when the measured temperature exceeds a

High Alert Limit register limit and clear at the end of a conversion cycle when the measured temperature is equal

to or below the High Limit value minus hysteresis. There are separate High Limit values and status register flags

for the remote and local temperature measurements. The status register flags only set or clear to the respective

temperature measurements. Refer to Section 8.30 .

The ALERT Low Status flag sets at the end of a conversion cycle when the measured temperature is below

a Low Alert Limit register limit and clears at the end of a conversion cycle when the measured temperature is

equal to or above the Low Limit value plus hysteresis. There are separate Low Limit values and status register

flags for the remote and local temperature measurements. The status register flags only set or clear to the

respective temperature measurements. Refer to Section 8.31 .

Figure 7-6 shows the behavior of the ALERT pin and flags while in Comparator mode.

-40

-20

ALERT

High Temperature Limit

ALERT

High Status

FLAG

100

120

140

160

Temperature Conversion Complete

Time

Temperature

Low Temperature Limit

ALERT

Low Status

FLAG

High Temperature Limit - Hysteresis

Low Temperature Limit + Hysteresis

Figure 7-6. Alert Comparator Mode Timing Diagram

7.4.1.3 T_CRIT Output

The TMP4719 T_CRIT pin is an active-low, open-drain output which is asserted at the end of a conversion cycle

when the measured temperature exceeds a T_CRIT Limit defined in the T_CRIT limit registers. A T_CRIT Status

The T_CRIT pin deasserts at the end of a conversion cycle if the temperature measurement is less than the

T_CRIT limit – T_CRIT Hysteresis. The T_CRIT Hysteresis is set in the Hysteresis register.

When the TMP4719 is set in interrupt mode, the status register flag is cleared by reading the status register.

The Status Register flag continues to set after the end of a conversion cycle until the temperature measurement

TMP4719

SBOSAJ7A – OCTOBER 2025 – REVISED DECEMBER 2025

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