TMP442 datasheet(12/60 Pages) TI2

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7.3 Feature Description

7.3.1 Device Initialization and Default Temperature Conversion

When VDD goes above VPOR (power-on reset threshold), the device initiates the power-on reset (POR) sequence

and starts loading default configuration settings into the device. After the device initialization is complete, the

device starts default local (1 channel) and remote (2 channels) temperature conversion. The converted result

and corresponding output (ALERT or T_CRIT) are asserted if the corresponding limit is crossed.

The device initialization and default conversion take approximately 67ms. During device initialization, the supply

voltage VDD is held stable and above VPOR (falling) to avoid any device misbehavior. Figure 7-2 depicts the

details timing sequence for the device initialization and default temperature conversion.

Device

Ini aliza on

Local

Temperature

Conversion

Remote

Temperature

Conversion

15ms

33.2ms

67ms

VDD > VPOR. Device initialization started.

Device initialization completed.

Local temperature conversion completed and result available in registers. ALERT and T_CRIT output

asserted if limit crossed.

Remote temperature conversion completed and result available in registers. ALERT and T_CRIT

output asserted if limit crossed.

Figure 7-2. Device Initialization and Default Temperature Conversion Timing

7.3.2 Series Resistance Cancellation

Series resistance cancellation automatically eliminates the temperature error caused by the resistance of the

routing to the remote transistor or by the resistors of the optional external low-pass filter. A total of up to 1kΩ of

series resistance can be canceled by the device, thus eliminating the need for additional characterization and

temperature offset correction.

7.3.3 ALERT and T_CRIT Output

The TMP4719-Q1 ALERT and T_CRIT pins are active-low open-drain outputs. The ALERT pin is asserted at

the end of a conversion cycle when the measured temperature exceeds a High Alert Limit or goes below a

Low Alert Limit. The T_CRIT pin is asserted at the end of a conversion cycle when the measured temperature

exceeds the T_CRIT limit defined in the limit register. The ALERT and T_CRIT pins can be used to notify the

system of overtemperature or undertemperature conditions and protect from thermally induced system damage.

Note that the ALERT and T_CRIT outputs are activated only when the corresponding bits are not masked in the

Alert_Mask register.

7.3.4 1.2V Logic Compatible Inputs

The device includes static input thresholds independent of supply to maintain compatibility with a 1.2V logic I2C

or SMBus. This removes the need for a translator when operating with a bus voltage different from the supply

voltage of the device.

TMP4719-Q1

SLVSJS0 – DECEMBER 2025

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