DS1631温度传感器及其应用技术

DS1631 Temperature Sensor and Its Applied Technique

DS1631是Maxim公司最近生产的数字温度传感器,它采用正比于绝对温度(PTAT)的带隙结构,从而保证在合理的成本下获得相当高的测量精度。通过2线与控制器接口,用户可选择(9～12位)输出分辨率,在0～+70℃范围,精度可达±0 5℃,可满足一般的测量需求。由于该传感器电压系数的非线性呈二次曲线形式,可以用数学方法补偿偏移和误差特性的曲率,精度还可再提高近10倍,进一步扩大了它的应用领域。在介绍了其结构原理、与单片机接口、编程原理的基础上,重点介绍了通过对器件的误差曲线进行二次方程拟合,用拟合方程修正给定温度点的误差进一步提高测量精度的方法。

The DS1631 is a temperature sensor that the company of Maxim produced recently.It uses a bandgap proportional-to-absolute temperature(PTAT)architecture to produce relatively high-accuracy measurement at a reasonable price.The temperature measurements require no external components,data is read/written through 2-wire serial interface(SDA and SCL Pins),and provide ±0.5 ℃ accuracy over 0 to+70 ℃ range.As a result of the nonlinearity of the voltage coefficient has a second-order shape,this makes it simple for the user to improve the accuracy by up 10x by mathematically compensating for the offset and curvature of the error characterstic.The applied realm was furtherly extended.As the construction principle was introduced,connect with microcontrollers,the procedure designs of the last point on foundation introduced the exaltation measures the method of the accuracy,namely,by'fitting'a second-order equation to the device error curve,and then using the customized equation to partially eliminate the error at a given temperature.