Question: What is the maximum input “LOW” voltage (VIL) and the minimum input “HIGH” voltage (VIH) for Tibbo modules?
Answer: Tibbo devices use CMOS-compatible circuits.
In simple words, this means that the the threshhold level is at about 2.5V. Input voltage below 2.5V will be treated as logical “LOW”. Input voltage above 2.5V will be treated as logical “HIGH”.