3.4.1 Voltage Monitor

The input pin PA19 of SAMG55J19 is used to monitor the 3.3V voltage rail through external voltage divisors. It can be used to monitor the VDC voltage rail mounting R14 and removing R15 resistor.

Important: The R14 resistor value depends on the voltage value of the input source power.
Figure 3-16. Voltage Monitor Circuit

The voltage monitor circuit allows the implementation of multiple applications such as:

  • Detection of fault conditions
  • Detection of Low-Power mode entering conditions
  • Detection of wake-up situations