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TMP421 Arkusz danych(PDF) 10 Page - Texas Instruments |
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TMP421 Arkusz danych(HTML) 10 Page - Texas Instruments |
10 / 30 page www.ti.com SERIES RESISTANCE CANCELLATION DIFFERENTIAL INPUT CAPACITANCE TEMPERATURE MEASUREMENT DATA TMP421 TMP422 TMP423 SBOS398B – JULY 2007 – REVISED MARCH 2008 from low to high. The change in measurement range and data format from standard binary to extended Series resistance in an application circuit that typically binary occurs at the next temperature conversion. For results from printed circuit board (PCB) trace data captured in the extended temperature range resistance and remote line length is automatically configuration, an offset of 64 (40h) is added to the cancelled by the TMP421/22/23, preventing what standard binary value, as shown in the Extended would otherwise result in a temperature offset. A total Binary column of Table 1. This configuration allows of up to 3k Ω of series line resistance is cancelled by measurement of temperatures as low as –64 °C, and the TMP421/22/23, eliminating the need for additional as high as +191 °C; however, most characterization and temperature offset correction. temperature-sensing diodes only measure with the See the two Remote Temperature Error vs Series range of –55 °C to +150°C. Additionally, the Resistance typical characteristic curves (Figure 4 and TMP421/22/23 are rated only for ambient Figure 5) for details on the effects of series resistance temperatures ranging from –40 °C to +125°C. and power-supply voltage on sensed remote Parameters in the Absolute Maximum Ratings table temperature error. must be observed. Table 1. Temperature Data Format (Local and Remote Temperature High Bytes) The TMP421/22/23 tolerate differential input capacitance of up to 1000pF with minimal change in LOCAL/REMOTE TEMPERATURE REGISTER HIGH BYTE VALUE (1 °C RESOLUTION) temperature error. The effect of capacitance on STANDARD BINARY(1) EXTENDED BINARY(2) sensed remote temperature error is illustrated in TEMP Figure 6, Remote Temperature Error vs Differential ( °C) BINARY HEX BINARY HEX Capacitance. –64 1100 0000 C0 0000 0000 00 –50 1100 1110 CE 0000 1110 0E –25 1110 0111 E7 0010 0111 27 0 0000 0000 00 0100 0000 40 Temperature measurement data may be taken over 1 0000 0001 01 0100 0001 41 an operating range of –40 °C to +127°C for both local and remote locations. 5 0000 0101 05 0100 0101 45 10 0000 1010 0A 0100 1010 4A However, measurements from –55 °C to +150°C can 25 0001 1001 19 0101 1001 59 be made both locally and remotely by reconfiguring 50 0011 0010 32 0111 0010 72 the TMP421/22/23 for the extended temperature 75 0100 1011 4B 1000 1011 8B range, as described below. 100 0110 0100 64 1010 0100 A4 Temperature data that result from conversions within 125 0111 1101 7D 1011 1101 BD the default measurement range are represented in 127 0111 1111 7F 1011 1111 BF binary form, as shown in Table 1, Standard Binary 150 0111 1111 7F 1101 0110 D6 column. Note that although the device is rated to only 175 0111 1111 7F 1110 1111 EF measure temperatures down to –55 °C, it may read temperatures below this level. However, any 191 0111 1111 7F 1111 1111 FF temperature below –64 °C results in a data value of –64 (C0h). Likewise, temperatures above +127 °C (1) Resolution is 1 °C/count. Negative numbers are represented in result in a value of 127 (7Fh). The device can be set two's complement format. to measure over an extended temperature range by (2) Resolution is 1 °C/count. All values are unsigned with a –64°C changing bit 2 (RANGE) of Configuration Register 1 offset. 10 Submit Documentation Feedback Copyright © 2007–2008, Texas Instruments Incorporated Product Folder Link(s): TMP421 TMP422 TMP423 |
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