The temperature sensor board is based on NXP’s SA56004 temperature sensor chip, which can be interfaced through I²C bus. IC SA56004 is an SMBus compatible, 11-bit remote/local digital temperature sensor with over temperature alarms. The remote channel of the board monitors a diode junction, such as a diode connected transistor, with the accuracy of ± 1°C.

Under-temperature and over-temperature alert thresholds can be programmed to cause the ALERT output to indicate when the on-chip or remote temperature is out of range. This output may be used as a system interrupt or SMBus alert. The T_CRIT output is activated when the on-chip or remote temperature measurement rises above the programmed T_CRIT threshold register value. This output may be used to activate a cooling fan, send a warning or trigger a system shutdown. The board provides isolated 12V/1Amp switching facility for the above applications with the help of T_CRIT signal. The board includes a LED to show the T_CRIT status.

The standard 0.1" FRC headers are provided for easy connection to other control systems. The board can be used for prototype development by hobbyists, engineers and students. The board is also suitable for teaching and learning temperature sensor interface through I²C.