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          EEPW首頁(yè) > 嵌入式系統(tǒng) > 設(shè)計(jì)應(yīng)用 > LM75A的數(shù)字溫度計(jì)的設(shè)計(jì)

          LM75A的數(shù)字溫度計(jì)的設(shè)計(jì)

          作者: 時(shí)間:2016-11-21 來(lái)源:網(wǎng)絡(luò) 收藏
          LM75A是PHILPS公司生產(chǎn)的數(shù)字溫度傳感器及看門狗。通過(guò)片內(nèi)集成的帶隙溫度傳感器和∑-△數(shù)摸轉(zhuǎn)換器來(lái)實(shí)現(xiàn)數(shù)字溫度的測(cè)量,并通過(guò)該溫度傳感器為用戶提供溫度超限報(bào)警輸出。LM75A內(nèi)部包含多個(gè)數(shù)據(jù)寄存器:(1)配置寄器(Conf):用來(lái)存儲(chǔ)器件的配置,如:器件工作模式、OS工作模式、OS極性和OS故障隊(duì)列;(2)溫度寄存器(Temp):用于存儲(chǔ)讀取的數(shù)字溫度;(3)設(shè)定點(diǎn)寄存器(Tos&Thyst):用來(lái)存儲(chǔ)可編程的過(guò)熱關(guān)斷和滯后限制。器件通過(guò)2線的串行I2C總線接口與控制器通信。LM75A包含一個(gè)開漏輸出(OS),當(dāng)溫度超過(guò)編程限制的值時(shí)該輸出有效。LM75A有3個(gè)可選的邏輯地址管腳,使得同一總線上可同時(shí)掛8個(gè)LM75A而無(wú)需其他硬件的支持

          CPU:STC89C54RD+
          晶震:11.0592M
          A0 A1 A2 均接地 地址設(shè)置為0 OS腳和INT0相連并通過(guò)10K上拉到VCC;當(dāng)轉(zhuǎn)換溫度超過(guò)極限溫度,輸出中斷蜂鳴器報(bào)警;刷新數(shù)碼管顯示溫度 共5位前一位表示正負(fù)溫度后三位為溫度125 - -55 最后一位為0.1度 最高可精確到0.125 數(shù)碼管圖略定時(shí)器100MS采集溫度一次

          本文引用地址:http://www.ex-cimer.com/article/201611/319373.htm

          #include
          #include
          #include

          sbit xiaoshu=P2^0; //COM口
          sbit ge=P2^1;
          sbit shi=P2^3;
          sbit bai=P2^4;
          sbit fh=P2^5;
          sbit SDA_LM75=P1^0; //數(shù)據(jù)
          sbit SCL_LM75=P1^1;
          sbit BP=P2^1;
          bit dp=0;
          unsigned char JS=0;


          #define LED P0 //8位數(shù)碼管 動(dòng)態(tài)時(shí)時(shí)刷新

          #define CONF 0X01 //配置寄存器
          #define TEMP 0X00 //溫度寄存器 只讀
          #define ALARM 0X03 //超溫關(guān)閉極限寄存器默認(rèn)5000H
          #define DELAY 0X02 //滯后寄存器默認(rèn)4B00H
          #define WADDR 0X90 //寫地址
          #define RADDR 0X91 //讀地址

          unsigned int tempdata=0; //全局變量申明溫度

          unsigned char code tab[]={ 0x3f,0x30,0x6d,0x79,0x72,0x5b,0x5f,0x31,0x7f,0x7b,0x40};//共陰
          //0, 1, 2 3 4 5 6 7 8 9
          //unsigned char tab[]={ 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//共陽(yáng)
          //0, 1, 2 3 4 5 6 7 8 9

          unsigned char code tabdp[]={ 0xbf,0xb0,0xed,0xf9,0xf2,0xdb,0xdf,0xb1,0xff,0xfb,0xc0};//共陰帶小數(shù)點(diǎn)
          //0, 1, 2 3 4 5 6 7 8 9
          //unsigned char tabdp[]={ 0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};//共陽(yáng)


          void delay_xms(unsigned int count) //延時(shí)函數(shù)
          {
          register unsigned char j;
          while (count --)
          {
          for (j=0;j<125;j++) //約1MS
          {
          }
          }
          }


          void Led_Display(unsigned int i,bit mode) //顯示函數(shù)
          {
          if(mode)
          LED = 0x40; //共陰負(fù)
          //LED=0xBF;
          else
          LED = 0x00;
          //LED= 0XFF;
          fh = 1;
          bai = 0;
          shi = 0;
          ge = 0;
          xiaoshu=0;
          delay_xms(1);
          LED = tab[i/1000];
          i%=1000;
          fh = 0;
          bai = 1;
          shi = 0;
          ge = 0;
          xiaoshu=0;
          delay_xms(1);
          LED = tab[i/100];
          i%=100;
          fh=0;
          bai = 0;
          shi = 1;
          ge = 0;
          xiaoshu=0;
          delay_xms(1);
          LED = tabdp[i/10]; //帶小數(shù)點(diǎn)
          fh=0;
          bai = 0;
          shi = 0;
          ge = 1;
          xiaoshu=0;
          delay_xms(1);
          LED = tab[i%10];
          fh=0;
          bai = 0;
          shi = 0;
          ge = 0;
          xiaoshu=1;
          delay_xms(1);
          }

          void delay(void) //延時(shí)函數(shù)
          {
          _nop_();
          _nop_();
          _nop_();
          _nop_();
          _nop_();
          }

          void start_lm75(void)//起始
          {
          SDA_LM75=1;
          SCL_LM75=1;
          delay();
          SDA_LM75=0;
          delay();
          SCL_LM75=0;
          }

          void stop_lm75(void)//停止
          {
          SDA_LM75=0;
          SCL_LM75=1;
          delay();
          SDA_LM75=1;
          delay();
          SCL_LM75=0;
          }

          void Check_Ack(void) //檢查應(yīng)答信號(hào)
          {
          SDA_LM75=1;
          SCL_LM75=1;
          F0=0;
          delay();
          if(SDA_LM75) //如果數(shù)據(jù)為高 置位非應(yīng)答標(biāo)志FO
          F0=1; //通用標(biāo)志位 PSW狀態(tài)寄存器
          SCL_LM75=0; //準(zhǔn)備下一變化數(shù)據(jù)
          }

          void Ack(void) //發(fā)響應(yīng)信號(hào)
          {
          SDA_LM75=0;
          delay();
          SCL_LM75=1;
          delay();
          SCL_LM75=0;
          }

          void no_Ack(void) //發(fā)非響應(yīng)信號(hào)
          {
          SDA_LM75=1;
          SCL_LM75=0;
          delay();
          SCL_LM75=1; //迫使數(shù)據(jù)傳輸結(jié)束
          delay();
          }

          void send_byte(unsigned char temp) //發(fā)送一字節(jié)數(shù)據(jù)
          {
          unsigned char i=8;
          while(i--)
          {
          SDA_LM75=(bit)(temp&0x80);
          SCL_LM75=1;
          delay();
          SCL_LM75=0;
          temp<<=1;
          }
          SCL_LM75=0;
          delay();
          SDA_LM75=1; //釋放SDA數(shù)據(jù)線
          }

          unsigned char read_byte(void) //讀一字節(jié)數(shù)據(jù)
          {
          unsigned char i=8;
          unsigned char temp;
          while(i--)
          {
          temp<<=1;
          if(SDA_LM75)
          temp++;
          SCL_LM75=1;
          delay();
          SCL_LM75=0;
          }
          SCL_LM75=0;
          delay();
          SDA_LM75=1; //釋放SDA數(shù)據(jù)線
          return (temp);
          }

          void Write_chardata(unsigned char addr,unsigned char tempdata)//寫配置寄存器
          {
          start_lm75();
          send_byte(WADDR);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return;
          }
          Ack();
          send_byte(addr);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return;
          }
          Ack();
          send_byte(tempdata);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return;
          }
          Ack();
          delay();
          stop_lm75();
          }

          void Write_intdata(unsigned char addr,unsigned int tempdata)//寫16位寄存器
          {
          unsigned char datahigh;
          unsigned char datalow;
          datahigh=(unsigned char)(tempdata>>8);
          datalow=(unsigned char)(tempdata&0x00FF);
          start_lm75();
          send_byte(WADDR);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return;
          }
          Ack();
          send_byte(addr);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return;
          }
          Ack();
          send_byte(datahigh);
          send_byte(datalow);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return;
          }
          Ack();
          delay();
          stop_lm75();
          }

          unsigned char read_chardata(unsigned char addr) //讀8位寄存器
          {
          unsigned char temp;
          start_lm75();
          send_byte(WADDR);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return 0;
          }
          Ack();
          send_byte(addr);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return 0;
          }
          Ack();
          send_byte(RADDR);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return 0;
          }
          Ack();
          temp=read_byte();
          stop_lm75();
          return (temp);
          }

          unsigned int read_intdata(unsigned char addr) //讀16位寄存器
          {
          unsigned char temphigh,templow;
          start_lm75();
          send_byte(WADDR);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return 0;
          }
          Ack();
          send_byte(addr);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return 0;
          }
          Ack();
          send_byte(RADDR);
          Check_Ack();
          if(F0)
          {
          no_Ack();
          return 0;
          }
          Ack();
          temphigh=read_byte();
          templow=(read_byte())&0xe0;
          stop_lm75();
          if(!(temphigh&0x80))
          {
          dp=0;
          return (((temphigh<<8)|templow)>>5);
          }
          else
          {
          dp=1;
          return (0x800-((temphigh<<8)|templow)>>5);
          }
          }

          void initial() // 初始化LM75A
          {
          Write_chardata(CONF,0X20); //0S中斷模式,溫度轉(zhuǎn)換正常模式
          Write_intdata(ALARM,0x3300); //100度極限 由高9位有效位組成 BIT15為1表示為負(fù)為0表示為正超過(guò)100度 觸發(fā)外部中斷0
          Write_intdata(DELAY,0X4A80); // 95度后不報(bào)警
          }


          void int0_int() interrupt 0 using 1 // 外部中斷0服務(wù)函數(shù)
          {
          BP=0;
          delay_xms(1000);
          BP=1;
          delay_xms(1000);
          }
          void t0_int() interrupt 1 using 1 //定時(shí)器0中斷服務(wù)函數(shù)
          {
          TR0=0;
          TH0=0xdc; // 10MS中斷初值
          TL0=0xff;
          TR0=1;
          JS++;
          if(JS>10) //加到10為100MS
          {
          JS=0;
          tempdata=read_intdata(TEMP); //采集數(shù)據(jù)
          tempdata=(tempdata/8)*10; //轉(zhuǎn)換為溫度
          }
          }

          void main() // 入口函數(shù)
          {
          IP=0X01;
          TMOD=0X01;
          TH0=0xdc; // 10MS中斷初值
          TL0=0xff;
          IT0=0; //外部中斷0采用電平觸發(fā)

          ET0=1;
          TR0=1; //開放定時(shí)器0中斷
          EX0=1;
          EA=1;
          initial();
          while(1)
          {
          if(dp)
          Led_Display(tempdata,1);
          else
          Led_Display(tempdata,0);
          }
          }




          關(guān)鍵詞: LM75A數(shù)字溫度

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