A good PCB layout for optimal thermal performance involves placing the device near a thermal pad or a heat sink, and ensuring good thermal conductivity between the device and the heat sink. A 4-layer PCB with a solid ground plane and a thermal relief pattern can also help to dissipate heat efficiently.
To ensure accurate temperature measurement, it's essential to calibrate the device, use a high-precision voltage reference, and minimize noise and interference in the circuit. Additionally, the device should be placed close to the thermal source being measured, and the thermal interface material should be optimized for good thermal conductivity.
The recommended power-up sequence for the LM94021 involves applying the power supply voltage (VCC) before the input voltage (VIN). This ensures that the internal voltage regulator is fully powered up before the input voltage is applied, which helps to prevent latch-up and ensures reliable operation.
The output voltage tolerance of the LM94021 can be handled by using a voltage regulator with a tight output voltage tolerance, such as ±1% or better. Additionally, the output voltage can be trimmed using an external resistor network or a digital potentiometer to achieve the desired output voltage.
The recommended ESD protection for the LM94021 involves using a TVS (Transient Voltage Suppressor) diode or a Zener diode with a voltage rating that matches the maximum voltage rating of the device. This helps to protect the device from electrostatic discharge and other voltage transients.
LM94021QBIMGX/NOPB datasheet
by Texas Instruments
