Texas Instruments recommends a 4-layer PCB with a solid ground plane on the bottom layer, and a thermal relief pattern on the top layer to minimize thermal resistance. Additionally, keeping the sensor away from heat sources and using thermal vias can improve thermal performance.
The TMP122AIDBVTG4 has a built-in calibration mechanism, but for high-accuracy applications, it's recommended to perform a 2-point or 3-point calibration using a precision temperature reference. This can be done using a calibration software or by implementing a calibration routine in the system's firmware.
The maximum cable length for the TMP122AIDBVTG4's digital interface (I2C or SPI) depends on the system's noise environment and the cable's capacitance. As a general guideline, Texas Instruments recommends keeping the cable length below 10 inches (25 cm) to ensure reliable communication. If longer cables are required, consider using a repeater or a buffer to maintain signal integrity.
The TMP122AIDBVTG4 has built-in error detection mechanisms, such as CRC and parity checks. In case of an error, the device can be reset using the reset pin or by re-initializing the interface. It's recommended to implement error handling routines in the system's firmware to detect and recover from errors, and to provide diagnostic information for fault analysis.
The TMP122AIDBVTG4 operates from a 1.8 V to 3.6 V power supply voltage. If your system's power supply voltage is outside this range, you may need to use a voltage regulator or a level shifter to ensure compatibility. Additionally, ensure that the power supply noise and ripple do not exceed the recommended specifications to maintain accurate temperature measurements.
TMP122AIDBVTG4 datasheet
by Texas Instruments
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