поискавой системы для электроныых деталей |
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TMP20 датащи(PDF) 7 Page - Texas Instruments |
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TMP20 датащи(HTML) 7 Page - Texas Instruments |
7 / 19 page 2.19262 10 +(1.8639 V ) 3.88 10 - O ´ ´ 6 -6 T= 1481.96+ - TMP20 www.ti.com SBOS466 – DECEMBER 2009 APPLICATION INFORMATION Linear transfer functions can be calculated for limited OVERVIEW temperature ranges by calculating the slope and offset for that limited range, where slope is calculated The TMP20 is a precision analog output temperature by: sensor. The temperature range of operation is –55°C to +130°C with supply voltages of 2.7V to 5.5V. The m = –7.76 x 10–6 x T – 0.0115 TMP20 can operate from power-supply voltages as low as 1.8V over a temperature range of +15°C to with T equal to the temperature at the middle of the +130°C. temperature range of interest. Power-supply bypassing is recommended; use a The offset in the linear transfer function is found by: 100nF capacitor placed as closely as possible to the b = [VOUT(TMAX) + VOUT(T) – m x (TMAX + T)]/2 supply pin. where VOUT(TMAX) is the calculated output voltage at TRANSFER FUNCTION TMAX as determined from the parabolic transfer function. The analog output of the TMP20 over the –55°C to +130°C temperature range corresponds to the VOUT(T) is then the calculated output voltage at T as parabolic transfer function: determined by using the parabolic transfer function. VOUT = (–3.88 × 10 –6 × T2) + (–1.15 × 10–2 × T) + Example 1 1.8639V Determine the linear transfer function for –40°C to Where the temperature T is in °C. +110°C. When solved for temperature, the equation is: TMIN = –40°C; TMAX = +110°C; therefore, T = +35°C m = –11.77mV/°C VOUT (110°C) = 0.5520V VOUT (35°C) = 1.4566V These equations apply over the entire operating range, –55°C to +130°C. b = 1.8576V A simplified linear transfer function for near +25°C Therefore, the linear transfer function for –40°C to measurement is: +110°C is: VOUT = –11.69mV/°C x T + 1.8663V. VOUT = –11.77mV/°C x T + 1.8576V space Table 1 shows many common temperature ranges of interest and the corresponding linear transfer space functions for these ranges. Note that the error (maximum deviation) of the linear equation from the space parabolic equation increases as the temperature ranges widen. Table 1. Common Temperature Ranges and Corresponding Linear Transfer Functions Temperature Range Maximum Deviation of Linear Equation Linear Equation from Parabolic Equation TMIN (°C) TMAX (°C) (V) (°C) –55 +130 VOUT = –11.79mV/°C x T + 1.8528 ±1.41 –40 +110 VOUT = –11.77mV/°C x T + 1.8577 ±0.93 –30 +100 VOUT = –11.77mV/°C x T + 1.8605 ±0.70 –40 +85 VOUT = –11.67mV/°C x T + 1.8583 ±0.65 –10 +65 VOUT = –11.71mV/°C x T + 1.8641 ±0.23 +35 +45 VOUT = –11.81mV/°C x T + 1.8701 ±0.004 +20 +30 VOUT = –11.69mV/°C x T + 1.8663 ±0.004 Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): TMP20 |
Аналогичный номер детали - TMP20_15 |
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Аналогичное описание - TMP20_15 |
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