ADT7410 ±0.5℃精度温度传感器

(24) 2024-03-20 21:01:01

 

■ 前言

ADT7410是一款基于SOIC封装的高精度数字温度传感器。它内部具有带隙温度参考源以及13位ADC,可以提高0.0625摄氏度的温度精度。这个温度分辨率还可以改变成16位(0.0075℃)。

ADT7410可以工作在2.7V至5.5V的工作电源。工作在3.3V时,工作电流为210uA。 ADT在Shutdown模式下,耗电量仅为2uA。

ADT7410可以工作在-55℃至150℃。可被广泛 应用在医疗器械、环境监控、计算机温度检测、温度保护、工业过程控制、电源系统监测以及手持设备应用等等。

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▲ ADT7410内部功能图

ADT7410通过I2C总线与MCU连接。本文通过制作基于STC8G1K08电路板,来访问四个温度传感器。

 

01实验电路板设计


1.MCU控制板制作1

○ 原理图设计

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▲ MCU原理图

2. ADT7410芯片小板2

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▲ ADT7410芯片小板

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▲ ADT7410 PCB板

通过温度板的右边四个电阻,来设定温度传感器的I2C地址:A1A0。具体设置如下图所示:

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▲ ADT7410地址设置通过RA1234

 

02MCU软件设计3


控制小板的串口命令:

else IFARG0("rt") { 
   
    printf("%f ", ADT7410ReadT(0));
    printf("%f ", ADT7410ReadT(1));
    printf("%f ", ADT7410ReadT(2));
    printf("%f\r\n", ADT7410ReadT(3));
} else IFARG0("rtx") { 
   
    printf("%04x ", ADT7410ReadTemp(0));
    printf("%04x ", ADT7410ReadTemp(1));
    printf("%04x ", ADT7410ReadTemp(2));
    printf("%04x\r\n", ADT7410ReadTemp(3));
} else IFARG0("rtb") { 
   
    nNumber = ADT7410ReadTemp(0);
    SendChar((unsigned char)(nNumber >> 8));
    SendChar((unsigned char)(nNumber));
    nNumber = ADT7410ReadTemp(1);
    SendChar((unsigned char)(nNumber >> 8));
    SendChar((unsigned char)(nNumber));
    nNumber = ADT7410ReadTemp(2);
    SendChar((unsigned char)(nNumber >> 8));
    SendChar((unsigned char)(nNumber));
    nNumber = ADT7410ReadTemp(3);
    SendChar((unsigned char)(nNumber >> 8));
    SendChar((unsigned char)(nNumber));        
}

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▲ 上电后实验电路板

 

※ 结论


本文构造可以同时访问四路ADT7410温度传感器。 通过串口命令可以获得对应的温度值。

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▲ 测量白炽灯泡在点亮后的温度上升

ADT7410 ±0.5℃精度温度传感器 (https://mushiming.com/)  第8张


▲ 测量制冷片的温度下降过程

ADT7410 ±0.5℃精度温度传感器 (https://mushiming.com/)  第9张


▲ 测量制冷片的温度上升过程

/* **============================================================================== ** ADT7410.C: -- by Dr. ZhuoQing, 2020-07-08 ** **============================================================================== */

//------------------------------------------------------------------------------
#define ADT7410_GLOBALS 1 // Define the global variables
#include "ADT7410.H"
#include "STC8G.H"

//------------------------------------------------------------------------------

//==============================================================================
// INTERFACE FUNCTIONS
//------------------------------------------------------------------------------
void ADT7410SetAdd(unsigned char ucA10) { 
   
    g_ucADT7410Add = ADT7410_I2C_ADD + (ucA10 << 1);
}

//------------------------------------------------------------------------------
void ADT7410Init(unsigned char ucAdd) { 
   
    ADT7410SetAdd(ucAdd);
    ADT7410SetConfiguration(0x80);        // Set 16 bits resolution of temperature.
}

//------------------------------------------------------------------------------
float ADT7410ReadT(unsigned char ucAdd) { 
   
    ADT7410SetAdd(ucAdd);
    ADT7410SetConfiguration(0x80);
    return ADT7410ReadTemperature() / 128.0;
}

//------------------------------------------------------------------------------
int ADT7410ReadTemp(unsigned char ucAdd) { 
   
    ADT7410SetAdd(ucAdd);
    ADT7410SetConfiguration(0x80);
    return ADT7410ReadTemperature();
}

//------------------------------------------------------------------------------
float ADT7410Temperature(int nNumber) { 
   
    return nNumber / 128.0;
}

//------------------------------------------------------------------------------
void ADT7410WriteByte(unsigned char ucAdd, unsigned char ucByte) { 
   
    I2CStart();
    I2CSendData(g_ucADT7410Add);
    I2CReceiveACK();
    I2CSendData(ucAdd);
    I2CReceiveACK();
    I2CSendData(ucByte);
    I2CReceiveACK();
    I2CStop();    
}

void ADT7410WriteInt(unsigned char ucAdd, unsigned int nNum) { 
   
    I2CStart();
    I2CSendData(g_ucADT7410Add);
    I2CReceiveACK();
    I2CSendData(ucAdd);
    I2CReceiveACK();
    
    ucAdd = (unsigned char)(nNum >> 8);    
    I2CSendData(ucAdd);
    I2CReceiveACK();
    
    ucAdd = (unsigned char)(nNum);    
    I2CSendData(ucAdd);
    I2CReceiveACK();
        
    I2CStop();
}

//------------------------------------------------------------------------------
unsigned char ADT7410ReadByte(unsigned char ucAdd) { 
   
    unsigned char ucByte;
    
    I2CStart();
    I2CSendData(g_ucADT7410Add);
    I2CReceiveACK();
    I2CSendData(ucAdd);
    I2CReceiveACK();
    
    I2CStart();
    I2CSendData(g_ucADT7410Add + 1);
    ucByte= I2CReceiveData();
    I2CSendNACK();
    I2CStop();
    
    return ucByte;    
}

void ADT7410ReadDim(unsigned char ucAdd, unsigned char ucLength, unsigned char * pDim) { 
       
    unsigned char ucByte, i;
    
    I2CStart();
    I2CSendData(g_ucADT7410Add);
    I2CReceiveACK();
    I2CSendData(ucAdd);
    I2CReceiveACK();
    
    I2CStart();
    I2CSendData(g_ucADT7410Add + 1);
    I2CReceiveACK();
    
    for(i = 0; i < ucLength; i ++) { 
   
        ucByte= I2CReceiveData();
        if(i < ucLength - 1)
            I2CSendACK();
        else I2CSendNACK();
        
        *(pDim + i) = ucByte;
    }
    
    I2CStop();
}

//------------------------------------------------------------------------------
int ADT7410ReadTemperature(void) { 
   
    unsigned char ucBytes[2];
    int nValue;
    
    ADT7410ReadDim(0x0, 2, ucBytes);
// ucBytes[0] = ADT7410ReadByte(0);
// ucBytes[1] = ADT7410ReadByte(1);
    nValue = ucBytes[0];
    nValue = (nValue << 8) | ucBytes[1];
    return nValue;
}

unsigned char ADT7410ReadStatus(void) { 
   
    unsigned char ucChar;
    ucChar = ADT7410ReadByte(ADT7410_STATUS_ADD);
    return ucChar;
}
    
unsigned char ADT7410ReadConfiguration(void) { 
   
    unsigned char ucChar;
    ucChar = ADT7410ReadByte(ADT7410_CONFIGURATION_ADD);
    return ucChar;
}
    
void ADT7410SetConfiguration(unsigned char ucConfiguration) { 
   
    ADT7410WriteByte(ADT7410_CONFIGURATION_ADD, ucConfiguration);
}

unsigned char ADT7410ReadID(void) { 
   
    unsigned char ucChar;
    ucChar = ADT7410ReadByte(ADT7410_ID_ADD);
    return ucChar;
}

void ADT7410SoftwareReset(void) { 
   
    ADT7410WriteByte(ADT7410_RESET_ADD, 0xaa);
}
    
void ADT7410SetHysteresisTemperature(unsigned char ucHysteresis) { 
   
    ADT7410WriteByte(ADT7410_THYST_ADD, ucHysteresis);
}

void ADT7410SetHighTemperature(int nT) { 
   
    ADT7410WriteInt(ADT7410_THIGH_ADD, nT);
}

void ADT7410SetLowTemperature(int nT) { 
   
    ADT7410WriteInt(ADT7410_TLOW_ADD, nT);
}

void ADT7410SetCriticalTemperature(int nT) { 
   
    ADT7410WriteInt(ADT7410_TCRIT_ADD, nT);
}

int ADT7410ReadHighTemperature(void) { 
   
    unsigned char ucBytes[2];
    int nValue;
    ADT7410ReadDim(ADT7410_THIGH_ADD, 2, ucBytes);
    nValue = ucBytes[0];
    nValue = (nValue << 8) | ucBytes[1];
    return nValue;
}
    
int ADT7410ReadLowTemperature(void) { 
   
    unsigned char ucBytes[2];
    int nValue;
    ADT7410ReadDim(ADT7410_TLOW_ADD, 2, ucBytes);
    nValue = ucBytes[0];
    nValue = (nValue << 8) | ucBytes[1];
    return nValue;
}
int ADT7410ReadCritialTemperature(void) { 
   
    unsigned char ucBytes[2];
    int nValue;
    
    ADT7410ReadDim(ADT7410_TCRIT_ADD, 2, ucBytes);
    nValue = ucBytes[0];
    nValue = (nValue << 8) | ucBytes[1];
    return nValue;
}

unsigned char ADT7410ReadHysteresisTemperature(void) { 
   
    return ADT7410ReadByte(ADT7410_THYST_ADD);
}

//==============================================================================
// END OF THE FILE : ADT7410.C
//------------------------------------------------------------------------------
/* **============================================================================== ** ADT7410.H: -- by Dr. ZhuoQing, 2020-07-08 ** ** Description: ** **============================================================================== */
#ifndef __ADT7410__
#define __ADT7410__
//------------------------------------------------------------------------------
#ifdef ADT7410_GLOBALS
   #define ADT7410_EXT
#else
   #define ADT7410_EXT extern
#endif // ADT7410_GLOBALS
//------------------------------------------------------------------------------
//==============================================================================

//------------------------------------------------------------------------------

#define ADT7410_I2C_ADD 0x90

ADT7410_EXT unsigned char g_ucADT7410Add;
void ADT7410SetAdd(unsigned char ucA10);

float ADT7410Temperature(int nNumber);

//------------------------------------------------------------------------------
float ADT7410ReadT(unsigned char ucAdd);
int ADT7410ReadTemp(unsigned char ucAdd);

//==============================================================================
// INTERFACE FUNCTIONS
//------------------------------------------------------------------------------
void ADT7410Init(unsigned char ucA10);

void ADT7410WriteByte(unsigned char ucAdd, unsigned char ucByte);
void ADT7410WriteInt(unsigned char ucAdd, unsigned int nNum);

unsigned char ADT7410ReadByte(unsigned char ucAdd);
void ADT7410ReadDim(unsigned char ucAdd, unsigned char ucLength, unsigned char * pDim);

//------------------------------------------------------------------------------

#define ADT7410_TEMPERATURE_ADD 0x0
#define ADT7410_STATUS_ADD 0x2
#define ADT7410_CONFIGURATION_ADD 0x3
#define ADT7410_THIGH_ADD 0x4
#define ADT7410_TLOW_ADD 0x6
#define ADT7410_TCRIT_ADD 0x8
#define ADT7410_THYST_ADD 0xA
#define ADT7410_ID_ADD 0x0B
#define ADT7410_RESET_ADD 0x2F

//------------------------------------------------------------------------------
int ADT7410ReadTemperature(void);
unsigned char ADT7410ReadStatus(void);
unsigned char ADT7410ReadConfiguration(void);
void ADT7410SetConfiguration(unsigned char ucConfiguration);
unsigned char ADT7410ReadID(void);
void ADT7410SoftwareReset(void);
void ADT7410SetHysteresisTemperature(unsigned char ucHysteresis);
void ADT7410SetHighTemperature(int nT);
void ADT7410SetLowTemperature(int nT);
void ADT7410SetCriticalTemperature(int nT);
int ADT7410ReadHighTemperature(void);
int ADT7410ReadLowTemperature(void);
int ADT7410ReadCritialTemperature(void);

unsigned char ADT7410ReadHysteresisTemperature(void);

//==============================================================================
// END OF THE FILE : ADT7410.H
//------------------------------------------------------------------------------
#endif // __ADT7410__

  1. MCU控制板AD工程文件:AD\Test\2020\Tools\ADT7410STC8G1k.SchDoc * ↩︎

  2. ADT7410印刷电路板设计工程文档:AD\Test\2020\Tools\ADT7410MOD.SchDoc ↩︎

  3. STC8G 工程文件:C51\STC\Test\2020\Tools\ADT7410STC8G1K\ADT7410STC8G1K.uvproj ↩︎

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