TMP411DADDFR datasheet(24/61 Pages) TI2

24 / 61 page

2.4V

t (sec)

VS (V)

2.7V

5.5V

t (sec)

Vout_ADC (V)

Undervoltage lockout

TMP411 Supply

Voltage range

1.6V

POR

Figure 7-2. Undervoltage Lockout Behavior

(Legacy Chip)

2.45V

t (sec)

VS (V)

2.7V

5.5V

Vout_ADC (V)

Undervoltage lockout

TMP411 Supply

Voltage range

1.23V

POR

t (sec)

Figure 7-3. Undervoltage Lockout Behavior (New

Chip)

7.3.7 Filtering

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

by fast digital signals that corrupt measurements. The TMP411/TMP411D has a built-in 65kHz filter on the D+

and D− inputs to minimize the effects of noise. TI recommends placing a bypass capacitor differentially across

the sensor inputs to protect the application against unwanted coupled signals. The value of the capacitor must

be between 100pF and 1nF. Some applications have better overall accuracy with additional series resistance,

however, this increased accuracy is specific to the setup. When series resistance is added, the value must not

be greater than 3kΩ.

If filtering is needed, TI recommends component values of 100pF and 50Ω on each input. Exact values are

specific to the application.

7.4 Device Functional Modes

7.4.1 Shutdown Mode (SD)

The TMP411/TMP411D shutdown mode saves maximum power by shutting down all device circuitry other than

the serial interface, which reduces current consumption to typically less than 3μA (0.6μA for TMP411 new chip

and TMP411D); see Figure 6-20 (Figure 6-21 for new chip). Shutdown mode is enabled when the shutdown

bit (SD) of the Configuration Register is configured 1’b. Once programmed, the device enters the shutdown

mode immediately and stops any current temperature conversion. If the shutdown mode is entered during

local temperature conversion, no update to local/remote temperature result occurs. If the shutdown mode is

entered during remote temperature conversion, no update to the remote temperature result occurs, but the local

temperature result is updated since the local temperature conversion is already completed. When the shutdown

bit (SD) is configured to 0’b, the device remains in continuous conversion state.

7.4.2 One-Shot Conversion

When the TMP411/TMP411D is in shutdown mode (SD = 1 in the Configuration Register), a single conversion

on both channels starts by writing any value to the One-Shot Start Register (pointer address 0Fh). This

write operation starts one conversion, and the TMP411/TMP411D device returns to shutdown mode when the

conversion is complete. The value of the data sent in the write command is irrelevant, and is not stored by

the TMP411/TMP411D. When the TMP411/TMP411D is in shutdown mode, an initial 200μs is required before a

one-shot command is given.

TMP411, TMP411D

SBOS383E – DECEMBER 2006 – REVISED JULY 2025

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