TMP411 datasheet(12/48 Pages) TI2

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TMP411

SBOS383D – DECEMBER 2006 – REVISED DECEMBER 2016

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9.3 Feature Description

9.3.1 Series Resistance Cancellation

Figure 11 shows series resistance in an application circuit that results from printed circuit board (PCB) trace

resistance and remote line length. The TMP411 automatically cancels the resistance, which prevents a

temperature offset.

The TMP411 device cancels up to 3 kΩ of series line resistance that eliminates the need for additional

characterization and temperature offset correction.

See Figure 4 and Figure 5 for details on the effect of series resistance and power-supply voltage on sensed

remote temperature error.

9.3.2 Differential Input Capacitance

The TMP411 tolerates differential input capacitance of up to 1000 pF with minimal change in temperature error.

The effect of capacitance on sensed remote temperature error is shown in Figure 6.

9.3.3 Temperature Measurement Data

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

Measurements from –55°C to +150°C can be made locally and remotely by reconfiguring the TMP411 device for

the extended temperature range. To change the TMP411 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 1. Note that any temperature below 0°C results in a data

value of zero (00h). Likewise, temperatures above 127°C results 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 offset of 64

(40h) is added to the standard binary value, as listed in the extended binary column in Table 1. This configuration

allows measurement of temperatures below 0°C. It is possible to have binary values in the range of –64°C to

+191°C, but most temperature-sensing diodes measure in the range of –55°C to +150°C. The TMP411 device is

rated only for ambient local temperatures ranging from –40°C to +125°C. Parameters in the Absolute Maximum

Ratings table must be observed.

TMP411 Datasheet(PDF) 12 Page - Texas Instruments