Remote Temperature Sensing with TMP464, TMP468, and Arduino
The TMP464 and TMP468 are multi-zone, high accuracy, low-power remote temperature sensors with a two-wire, SMBus or I2C compatible interface. The TMP464 is available in a VQGN package and is capable of monitoring up to 4 remote PN junctions simultaneously. The TMP468 can monitor as many as eight remote PN junctions simultaneously and is available in both a VQGN package and in an extremely small, space-efficient DSBGA package. Both of these devices offer series resistance cancellation, n-factor correction, offset correction, and Diode fault detection.
In this tutorial, we will first discuss remote temperature sensors in general, as well as the specific features of the TMP464 and TMP468. We will cover N-factor correction, which is essential to ensure the accuracy of the remote channels, and then we will cover the configuration of the TMP464 and TMP468 for quick use. Finally, we will step through a demonstration where the breakaway portion of the TMP468EVM and an Arduino Uno is used to print local and remote temperature to a standard 16x2 LCD display.