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TMP423B Datasheet(PDF) 11 Page - Texas Instruments |
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TMP423B Datasheet(HTML) 11 Page - Texas Instruments |
11 / 34 page TMP421 TMP422 TMP423 www.ti.com SBOS398C – JULY 2007 – REVISED MAY 2012 SERIES RESISTANCE CANCELLATION changing bit 2 (RANGE) of Configuration Register 1 from low to high. The change in measurement range Series resistance in an application circuit that typically and data format from standard binary to extended results from printed circuit board (PCB) trace binary occurs at the next temperature conversion. For resistance and remote line length is automatically data captured in the extended temperature range cancelled by the TMP421/22/23, preventing what configuration, an offset of 64 (40h) is added to the would otherwise result in a temperature offset. A total standard binary value, as shown in the Extended of up to 3k Ω of series line resistance is cancelled by Binary column of Table 1. This configuration allows the TMP421/22/23, eliminating the need for additional measurement of temperatures as low as –64°C, and characterization and temperature offset correction. as high as +191°C; however, most temperature- See the two Remote Temperature Error vs Series sensing diodes only measure with the range of –55°C Resistance typical characteristic curves (Figure 4 and to +150°C. Additionally, the TMP421/22/23 are rated Figure 5) for details on the effects of series resistance only for ambient temperatures ranging from –40°C to and power-supply voltage on sensed remote +125°C. Parameters in the Absolute Maximum temperature error. Ratings table must be observed. DIFFERENTIAL INPUT CAPACITANCE 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 sensed remote temperature error is illustrated in STANDARD BINARY(1) EXTENDED BINARY(2) 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 TEMPERATURE MEASUREMENT DATA –25 1110 0111 E7 0010 0111 27 0 0000 0000 00 0100 0000 40 Temperature measurement data may be taken over an operating range of –40°C to +127°C for both local 1 0000 0001 01 0100 0001 41 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 range, as described below. 75 0100 1011 4B 1000 1011 8B 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 measure temperatures down to –55°C, it may read 175 0111 1111 7F 1110 1111 EF temperatures below this level. However, any 191 0111 1111 7F 1111 1111 FF temperature below –64°C results in a data value of (1) Resolution is 1°C/count. Negative numbers are represented in –64 (C0h). Likewise, temperatures above +127°C two's complement format. result in a value of 127 (7Fh). The device can be set (2) Resolution is 1°C/count. All values are unsigned with a –64°C to measure over an extended temperature range by offset. Copyright © 2007–2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TMP421 TMP422 TMP423 |
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