数字温度传感器外文翻译6(编辑修改稿)

数字温度传感器外文翻译6(编辑修改稿)内容摘要：

byte temperature register in the scratchpad memory and the DS18B20 returns to its idle state. If the DS18B20 is powered by an external supply, the master can issue ―read time slots‖ (see the 1WIRE BUS SYSTEM section) after the Convert T mand and the DS18B20 will respond by transmitting 0 while the temperature conversion is in progress and 1 when the conversion is done. If the DS18B20 is powered with parasite power, this notification technique cannot be used since the bus must be pulled high by a strong pull up during the entire temperature conversion. The DS18B20 output temperature data is calibrated in degrees centigrade。 for Fahrenheit applications, a lookup table or conversion routine must be used. The temperature data is stored as a 16bit signextended two’s plement number in the temperature register (see Figure 2). The sign bits (S) indicate if the temperature is positive or negative: for positive numbers S = 0 and for negative numbers S = 1. If the DS18B20 is configured for 12bit resolution, all bits in the temperature register will contain valid data. For 11bit resolution, bit 0 is undefined. For 10bit resolution, bits 1 and 0 are undefined, and for 9bit resolution bits 2, 1 and 0 are undefined. POWERING THE DS18B20 The DS18B20 can be powered by an external supply on the VDD pin, or it can operate in ―parasite power‖ mode, which allows the DS18B20 to function without a local external supply. Parasite power is very useful for applications that require remote temperature sensing or that are very space constrained. DS18B20’s parasitepower control cir。