The recommended PCB layout for the MAX6690MEE+ is to keep the analog and digital grounds separate, use a solid ground plane, and keep the input and output traces short and away from noise sources. A 4-layer PCB with a dedicated analog ground plane is recommended.
To ensure accurate temperature measurement, ensure that the thermal diode is properly connected, the device is calibrated correctly, and the thermal diode is not subject to thermal gradients or self-heating. Also, use a low-noise power supply and minimize digital noise coupling to the analog inputs.
The maximum cable length for the remote diode connection depends on the cable capacitance and the desired measurement accuracy. As a general rule, keep the cable length as short as possible (less than 10 inches) and use a shielded cable to minimize noise pickup.
No, the MAX6690MEE+ is designed to work with thermal diodes, not thermocouples. Using a thermocouple would require additional circuitry and signal conditioning, and is not recommended.
The MAX6690MEE+ has built-in fault detection and alert features. To handle these features, connect the ALERT pin to a microcontroller or other logic circuit, and use the device's fault detection flags to determine the type of fault. The datasheet provides more information on the fault detection and alert features.
