JAJSFO5C June 2018 – April 2021 TMP117
The device temperature sampling distribution (with averaging disabled) covers an area of approximately six neighboring codes. The noise area of the six codes remains the same at full supply and full temperature range with a standard deviation of approximately 1 LSB. The device provides an averaging tool for 1, 8, 32, or 64 conversions. As shown in Figure 6-7, the 8-sample averaging reduces the internal noise distribution to a theoretical minimum of 2 LSB. This averaging means that if the system temperature slowly changes and the supply voltage is stable, then the 8-sample averaging can be enough to neutralize the device noise and provide stable temperature readings. However, if the system environment is noisy (such as when measuring air flow temperatures, power supply fluctuations, intensive communication on a serial bus, and so forth), then higher averaging numbers are recommended to be used.