The datasheet’s Figure 12 shows a timing violation to avoid: SCL low time must be > 1.3 µs at 400 kHz. Failing this can cause stray capacitance to corrupt the ALERT pin logic.
Self-heating is negligible (<0.05°C). However, if placed near a hot LDO or power MOSFET, the package’s copper pad (exposed pad in WDFN) must be soldered to a ground plane to ensure accurate measurement of ambient temperature. npct75x datasheet
The NPCT75X is a high-accuracy, low-power temperature-to-digital converter. Unlike traditional thermistors or thermocouples, the NPCT75X requires no external calibration or signal conditioning. The series typically includes variants such as the NPCT75A, NPCT75B, and NPCT75C, which differ in accuracy grades (e.g., ±0.5°C, ±1.0°C) and supply voltage ranges. The datasheet’s Figure 12 shows a timing violation
VDD (3.3V) ---[0.1µF]--- GND VDD ---[4.7k]--- SDA VDD ---[4.7k]--- SCL VDD ---[4.7k]--- ALERT SCL, SDA, ALERT ---> MCU GPIO ADDR ----> GND (address 0x48) However, if placed near a hot LDO or