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TMP411DQDGKRQ1 Arkusz danych(PDF) 9 Page - Texas Instruments |
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TMP411DQDGKRQ1 Arkusz danych(HTML) 9 Page - Texas Instruments |
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9 / 40 page  TMP411-Q1 www.ti.com SBOS527F – DECEMBER 2010 – REVISED NOVEMBER 2013 SERIES RESISTANCE CANCELLATION TEMPERATURE MEASUREMENT DATA Series resistance in an application circuit that typically Temperature measurement data are taken over a results from printed circuit board (PCB) trace default range of 0°C to 127°C for both local and resistance and remote line length (see Figure 11) is remote locations. Measurements from –55°C to automatically cancelled by the TMP411-Q1, 150°C can be made both locally and remotely by preventing what would otherwise result in a reconfiguring the TMP411-Q1 for the extended temperature offset. temperature range. To change the TMP411-Q1 configuration from the standard to the extended A total of up to 3 k Ω of series line resistance is temperature range, switch bit 2 (RANGE) of the cancelled by the TMP411-Q1, eliminating the need Configuration Register from low to high. for additional characterization and temperature offset correction. Temperature data resulting from conversions within the default measurement range are represented in See the two Remote Temperature Error vs Series binary form, as shown in Table 2, Standard Binary Resistance typical characteristics curves (Figure 4 column. Note that any temperature below 0°C results and Figure 5) for details on the effect of series in a data value of zero (00h). Likewise, temperatures resistance and power-supply voltage on sensed above 127°C result in a value of 127 (7Fh). The remote temperature error. device can be set to measure over an extended temperature range by changing bit 2 of the DIFFERENTIAL INPUT CAPACITANCE Configuration Register from low to high. The change in measurement range and data format from standard The TMP411-Q1 tolerates differential input binary to extended binary occurs at the next capacitance of up to 1000 pF with minimal change in temperature conversion. For data captured in the temperature error. The effect of capacitance on extended temperature range configuration, an offset sensed remote temperature error is illustrated in of 64 (40h) is added to the standard binary value, as typical characteristic Remote Temperature Error vs shown in Table 1, Extended Binary column. This Differential Capacitance (Figure 6). configuration allows measurement of temperatures below 0°C. Note that binary values corresponding to temperatures as low as –64°C, and as high as 191°C are possible; however, most temperature-sensing diodes only measure with the range of –55°C to 150°C. Additionally, the TMP411-Q1 is rated only for ambient local temperatures ranging from –40°C to 125°C. Parameters in the Absolute Maximum Ratings table must be observed. Table 2. Temperature Data Format (Local and Remote Temperature High Bytes) LOCAL/REMOTE TEMPERATURE REGISTER HIGH BYTE VALUE (1°C RESOLUTION) TEMP (°C) STANDARD BINARY EXTENDED BINARY BINARY HEX BINARY HEX −64 0000 0000 00 0000 0000 00 −50 0000 0000 00 0000 1110 0E −25 0000 0000 00 0010 0111 27 0 0000 0000 00 0100 0000 40 1 0000 0001 01 0100 0001 41 5 0000 0101 05 0100 0101 45 10 0000 1010 0A 0100 1010 4A 25 0001 1001 19 0101 1001 59 50 0011 0010 32 0111 0010 72 75 0100 1011 4B 1000 1011 8b 100 0110 0100 64 1010 0100 A4 125 0111 1101 7D 1011 1101 BD 127 0111 1111 7F 1011 1111 BF 150 0111 1111 7F 1101 0110 D6 Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TMP411-Q1 |
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