TMP442 datasheet(13/63 Pages) TI2

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7.3.5 Digital Filter

Remote junction temperature sensors are typically implemented in a noisy environment. Noise is most often

created by fast digital signals that can corrupt measurements. A digital filter is available for the remote

temperature measurements to reduce the effect of noise. This filter is programmable and has two levels when

enabled. Level 1 performs a moving average of four consecutive samples. Level 2 performs a moving average of

eight consecutive samples. After POR, the output of the digital filter starts with a default ZERO without previous

data. The output of the digital filter is stored in the remote temperature result register, and the temperature limits

are compared to this value. The filter responses to impulse and step inputs are shown in Figure 7-3 and Figure

7-4, respectively. The filter can be enabled or disabled by programming the desired levels in register settings.

The digital filter is disabled by default.

The averages are cleared after the filter is set to 00h. Filtering can be used with both continuous conversions

and one-shot conversions.

100

Samples

Disabled

Level1

Level 2

Figure 7-3. Filter Response to Impulse Inputs

100

Samples

Disabled

Level 1

Level 2

Figure 7-4. Filter Response to Step Inputs

In addition to the built-in digital filter of the device, TI recommends the user add an external capacitor between

the DP and DN pins on the remote channel. The capacitor acts as a bypass filter to help reduce high-frequency

EMI noise when the device is operating in a noisy environment. The recommended optimal value for the

capacitor is 470pF, and the value must not exceed 3nF to allow proper operation of the temperature sensor.

7.3.6 One-Shot Conversions

Users can write any data to the one-shot register to trigger a manual single one-shot conversion. This allows for

greater control of the device and flexibility of system implementation. This feature is only available in Shutdown

mode, and writes to the one-shot register has no effect in continuous conversion mode. For best performance in

one-shot mode, have the communication bus idle during temperature conversion (within tCONV after a conversion

is triggered).

www.ti.com

TMP4719

SBOSAJ7A – OCTOBER 2025 – REVISED DECEMBER 2025

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