TMP411D datasheet(24/60 Pages) TI2

24 / 60 page

2.4V

t (sec)

VS (V)

2.7V

5.5V

t (sec)

Vout_ADC (V)

Undervoltage lockout

TMP411-Q1

Supply Voltage

range

1.6V

POR

Figure 7-3. Undervoltage Lockout Behavior

(Legacy Chip)

2.45V

t (sec)

VS (V)

2.7V

5.5V

Vout_ADC (V)

Undervoltage lockout

TMP411-Q1 Supply

Voltage range

1.23V

POR

t (sec)

Figure 7-4. Undervoltage Lockout Behavior (New

Chip)

7.3.7 Filtering

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

created by fast digital signals, and it can corrupt measurements. The TMP411-Q1 and TMP411D-Q1 devices

have a built-in 65kHz filter on the inputs of D+ and D− to minimize the effects of noise. However, a bypass

capacitor placed differentially across the inputs of the remote temperature sensor is recommended to make

the application more robust against unwanted coupled signals. The value of the capacitor must be between

100pF and 1nF. Some applications attain better overall accuracy with additional series resistance; however, this

increased accuracy is setup-specific. When series resistance is added, the value must not be greater than 3kΩ.

If filtering is needed, the suggested component values are 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-Q1 and TMP411D-Q1 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 the

TMP411-Q1 new chip and TMP411D-Q1); see Figure 6-20 (Figure 6-21 for the 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 the 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-Q1 and TMP411D-Q1 devices are in Shutdown mode (SD = 1 in the Configuration Register),

a single conversion on both channels is started by writing any value to the One-Shot Start Register, pointer

address 0Fh. This write operation starts one conversion; the TMP411-Q1 and TMP411D-Q1 return to Shutdown

mode when that conversion completes. The value of the data sent in the write command is irrelevant and is not

stored by the TMP411-Q1 and TMP411D-Q1. When the TMP411-Q1 and TMP411D-Q1 devices are in Shutdown

mode, an initial 200μs is required before a one-shot command can be given. (NOTE: When a shutdown

command is issued, the TMP411-Q1 and TMP411D-Q1 complete the current conversion before shutting down.)

This wait time only applies to the 200μs immediately following shutdown. One-shot commands can be issued

without delay thereafter.

TMP411-Q1, TMP411D-Q1

SBOS527G – DECEMBER 2010 – REVISED SEPTEMBER 2025

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