[参考译文] MSP430FG6426：CTSD16：内部温度传感器不工作？、电压范围

尊敬的 Peter：

我进一步研究了该示例代码、结果不正确。 TLV 数据(可在数据表中找到)包含 CTSD16的校准值以及内部温度传感器。  

通过查看 MSPFR413x_ADC10温度示例、我们可以对该器件使用相同的过程、并将校准数据存储在 TLV 数据中。 以下是转换 MSPFG6426示例所执行的步骤。

1. 找到 TLV 表中温度校准数据的存储器位置
   1. 
2. 为内存地址创建#define 以便于阅读
   1. #define CALADC_30C *((unsigned int *) 0x1A1E)
   2. #define CALADC_85C *((unsigned int*) 0x1A20)
3. 由于我们正在使用校准数据、我们需要更改公式、因此这些校准值基于摄氏度。
4. 这是基于 FR413x 示例的公式
5. Results [1]=(results[0]- CALADC_30C)*(85-30)/(CALADC_85C - CALADC_30C)+ 30
   Results[2]= Results[4]* 9/5 + 32;

我会在下面发布整个代码部分、以便您可以复制和粘贴以自行测试。

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//******************************************************************************
//  MSP430FG662x Demo - CTSD16, Using the Integrated Temperature Sensor, Ext. Res.
//
//  Description: This program uses the CTSD16 module to perform a single
//  conversion on a single channel which is internally connected to the CTSD16's
//  temperature sensor and an external resistor feeding the CTSD16 clock. 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 CTSD16 module - see datasheet
//         1nF 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 = (CTSD16MEM0)/32767 * Vref(mV)
//  DegK = (CTSD16MEM0 * 1200)/32767/2.158 = (CTSD16MEM0 * 1200)/70711
//  DegC =  DegK - 273
//  DegF = (DegC * 9/5) + 32
//
//
//               MSP430FG662x
//             -----------------
//         /|\|                |
//          | |                |
//          --|RST             |
//            |                |        (A0.6+/- connected internally)
//            |A0.6+      VREF |---+    (to CTSD16's temperature sensor)
//            |A0.6-           |   |
//            |                |  -+- 1nF
//            |                |  -+-
//            |                |   |
//            |           AVss |---+
//
//  M. Swanson
//  Texas Instruments, Inc
//  April 2014
//  Built with Code Composer Studio v5.5
//******************************************************************************
#include <msp430.h>
#define CALADC_30C *((unsigned int *) 0x1A1E)
#define CALADC_85C *((unsigned int*) 0x1A20)
unsigned int  results[3];                   // CTSD16 Conversion and Temp Results
                                            // results[0] = raw CTSD16 results
                                            // results[1] = temp in C
                                            // results[2] = temp in F

void main(void) {
    WDTCTL = WDTPW | WDTHOLD;               // Stop watchdog

    CTSD16CTL = CTSD16CLKR | CTSD16REFS;   // Use internal ref, external resistor
    CTSD16CCTL0  |= CTSD16SNGL; //| CTSD16DF; // Enable interrupt
    CTSD16INCTL0 |= CTSD16INCH_6;           // Internal temp sensor
    CTSD16IFG &= ~CTSD16IFG0;               // Clear CH0 result interrupt
    CTSD16IE |= CTSD16IE0;                  // Enable CH0 result interrupt

    __delay_cycles(2000);                   // Delay ~120us for 1.2V ref to settle

    while(1) {
        CTSD16CCTL0 |= CTSD16SC;            // Set bit to start conversion
        __bis_SR_register(LPM0_bits | GIE); // Enter LPM0 w/ interrupts
        __no_operation();                   // For debugger

        // Calculate Temperatures in different scales
        results[1] = (results[0] -  CALADC_30C) * (85-30) / (CALADC_85C - CALADC_30C) + 30;
        results[2] = results[4] * 9/5 + 32; 
        __no_operation();                   // SET BREAKPOINT HERE
    }
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=CTSD16_VECTOR
__interrupt void CTSD16_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(CTSD16_VECTOR))) CTSD16_ISR (void)
#else
#error Compiler not supported!
#endif
{
    switch (__even_in_range(CTSD16IV,CTSD16IV_CTSD16MEM0)) {
        case CTSD16IV_NONE: break;
        case CTSD16IV_CTSD16OVIFG: break;
        case CTSD16IV_CTSD16MEM0:
                   results[0] = CTSD16MEM0; // Save CH0 results (clears IFG)
                   break;
        default: break;
    }
    __bic_SR_register_on_exit(LPM0_bits);   // Wake up from LPM0
}

数据格式不正确、需要二进制补码、因为校准数据是基于二进制补码形成的。 还有一个未经校准的偏移。 如果您自己进行校准、我建议使用偏移版本而不是二进制补码。

此致、

Luke Ledbetter