TMP411D datasheet(20/60 Pages) TI2

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7.2 Functional Block Diagram

Device ID Register

Manufacturer ID Registor

THERM Hysteresis Register

Consecutive Alert

Configuration Register

Status Register

Conversion Rate

N-Factor

Correction

One-Shot

D+

Bus Interface

Pointer Register

Resolution Register

Configuration Register

Local Temp Low Limit

Local THERM Limit

Local Temp High Limit

Remote Temp Low Limit

Remote THERM Limit

Remote Temp High Limit

Remote

Temperature

Local

Temperature

Comparators

Interrupt

Configuration

SCL

GND

THERM

ALERT/THERM2

V+

SDA

D−

TMP411-Q1

Remote Temperature Min/Max Register

Local Temperature Min/Max Register

Figure 7-2. Functional Block Diagram

7.3 Feature Description

7.3.1 Series Resistance Cancellation

Figure 7-1 shows series resistance in an application circuit that results from printed circuit board (PCB)

trace resistance and remote line length. The TMP411-Q1 and TMP411D-Q1 devices automatically cancel the

resistance, which prevents a temperature offset.

The TMP411-Q1 and TMP411D-Q1 devices cancel up to 3kΩ of series line resistance, which eliminates the

need for additional characterization and temperature offset correction.

See Figure 6-8 (Figure 6-9 for a new chip), Figure 6-10 (Figure 6-11 for a new chip), Figure 6-26 and Figure 6-27

for details on the effect of series resistance and power-supply voltage on sensed remote temperature error.

7.3.2 Differential Input Capacitance

The TMP411-Q1 and TMP411D-Q1 devices tolerate differential input capacitance of up to 1000pF with minimal

change in temperature error. The effect of capacitance on the sensed remote temperature error is shown in

Figure 6-12 (Figure 6-13 for new chip) and Figure 6-28.

7.3.3 Temperature Measurement Data

Temperature measurement data is taken over a default range of 0°C to 127°C for both local and remote

locations. Measurements from –55°C to 150°C can be made both locally and remotely by reconfiguring the

TMP411-Q1 and TMP411D-Q1 devices for the extended temperature range. To change the TMP411-Q1 and

TMP411D-Q1 configuration from the standard to the extended temperature range, switch bit 2 (RANGE) of the

Configuration Register from low to high.

Temperature data resulting from conversions within the default measurement range are represented in binary

form, as listed in the standard binary column of Table 7-1. Note that any temperature below 0°C results in a

data value of zero (00h). Likewise, temperatures above 127°C result in a value of 127 (7Fh). The device can

be set to measure over an extended temperature range by changing bit 2 of the Configuration Register from

low to high. The change in measurement range and data format from standard binary to extended binary occurs

at the next temperature conversion. For data captured in the extended temperature range configuration, an

TMP411-Q1, TMP411D-Q1

SBOS527G – DECEMBER 2010 – REVISED SEPTEMBER 2025

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