msp430 i2041 温度计算？sd24

sd24采样温度，应该如何计算转换为温度。

我得到的原始值是460W。应该如何换算为温度。文档上面没看明白。

电压计算文档还是描述的很清楚

xyz549040622：

www.ti.com.cn/…/slac676f.zip
参考下上面这个代码示例，MSP430i20xx 代码示例，解压路径下slac676f\MSP430i20xx_Code_Examples\C\msp430i20xx_sd24_06就是温度计算的例程。
或者参考下下面这个文档的13.2.11章节，有个计算公式的。
www.ti.com.cn/…/slau335.pdf

Susan Yang：

谢谢楼上的回答

我直接贴一下例程代码吧，该例程转换完成后，将结果存储在变量中，然后转换为摄氏度和华氏度值。

/* --COPYRIGHT--,BSD_EX* Copyright (c) 2013, Texas Instruments Incorporated* All rights reserved.** Redistribution and use in source and binary forms, with or without* modification, are permitted provided that the following conditions* are met:** *Redistributions of source code must retain the above copyright*notice, this list of conditions and the following disclaimer.** *Redistributions in binary form must reproduce the above copyright*notice, this list of conditions and the following disclaimer in the*documentation and/or other materials provided with the distribution.** *Neither the name of Texas Instruments Incorporated nor the names of*its contributors may be used to endorse or promote products derived*from this software without specific prior written permission.** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.**********************************************************************************MSP430 CODE EXAMPLE DISCLAIMER** MSP430 code examples are self-contained low-level programs that typically* demonstrate a single peripheral function or device feature in a highly* concise manner. For this the code may rely on the device's power-on default* register values and settings such as the clock configuration and care must* be taken when combining code from several examples to avoid potential side* effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware* for an API functional library-approach to peripheral configuration.** --/COPYRIGHT--*/
//******************************************************************************
//MSP430i20xx Demo - SD24, Using the Integrated Temperature Sensor
//
//Description: This program uses the SD24 module to perform a single
//conversion on a single channel which is internally connected to the SD24's
//temperature sensor. Once the conversion is completed, the result is stored in
//a variable then converted into Celsius and Fahrenheit values.
//
//Test by setting a breakpoint at the indicated line. Upon reaching the breakpoint
//the conversion result will be stored in the results array. The result will
//then be taken and converted into degrees K, C, and F and be saved in the same
//array.
//
//ACLK = 32kHz, MCLK = SMCLK = Calibrated DCO = 16.384MHz, SD_CLK = 1.024MHz
//* Ensure low_level_init.c is included when building/running this example *
//
//Notes: For minimum Vcc required for SD24 module - see datasheet
//100nF cap btw Vref and AVss is recommended when using 1.2V ref
//
//Sensor's temperature coefficient is 2.158mV/K (from datasheet)
//Sensor's offset voltage ranges from -100mv to 100mV (assume 0)
//Vsensor = 1.32mV * DegK + Vsensor_offset (assuming 0mv for offset)
//Vsensor = (SD24MEM0)/32767 * Vref(mV)
//DegK = (SD24MEM0 * 1200)/32767/2.158 = (SD24MEM0 * 1200)/70711
//DegC =DegK - 273
//DegF = (DegC * 9/5) + 32
//
//
//MSP430i20xx
//-----------------
///|\||
//| ||
//--|RST|
//||(A0.6+/- connected internally)
//|A0.6+VREF |---+(to SD24's temperature sensor)
//|A0.6-||
//||-+- 100nF
//||-+-
//|||
//|AVss |---+
//
//T. Witt
//Texas Instruments, Inc
//September 2013
//Built with Code Composer Studio v5.5
//******************************************************************************
#include "msp430.h"unsigned intresults[4];// SD24 Conversion and Temp Results// results[0] = raw SD24 results// results[1] = temp in K// results[2] = temp in C// results[3] = temp in Fvoid main(void) {WDTCTL = WDTPW | WDTHOLD;// Stop WDTSD24CTL = SD24REFS;// Internal refSD24CCTL0|= SD24SNGL | SD24DF | SD24IE;// Enable interruptSD24INCTL0 |= SD24INCH_6;// Internal temp sensor__delay_cycles(3200);// Delay ~200us for 1.2V ref to settlewhile(1) {SD24CCTL0 |= SD24SC;// Set bit to start conversion__bis_SR_register(LPM0_bits | GIE);// Enter LPM0 w/ interrupts__no_operation();// For debugger// Calculate Temperatures in different scalesresults[1] = ((unsigned long)results[0] * 1200)/70711;results[2] = results[1] - 273;results[3] = (results[2] * 9/5) + 32;__no_operation();// SET BREAKPOINT HERE}
}#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=SD24_VECTOR
__interrupt void SD24_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(SD24_VECTOR))) SD24_ISR (void)
#else
#error Compiler not supported!
#endif
{switch (__even_in_range(SD24IV,SD24IV_SD24MEM3)) {case SD24IV_NONE: break;case SD24IV_SD24OVIFG: break;case SD24IV_SD24MEM0:results[0] = SD24MEM0;// Save CH0 results (clears IFG)break;case SD24IV_SD24MEM1: break;case SD24IV_SD24MEM2: break;case SD24IV_SD24MEM3: break;default: break;}__bic_SR_register_on_exit(LPM0_bits);// Wake up from LPM0
}