5.4 System Control

The SAMA5D27 SOM1 provides global system Reset (nRST) and Shutdown (SHDN) pins to the application board.

  • The nRST pin is an output pin generated by the internal Power Management Unit (MIC2800-G1JJYML) in respect with power sequence timing. It can be forced externally in case of a system crash and must be connected as described in the example schematic below.
  • The SHDN pin is an output pin and is managed by the software application. It switches the Main 3.3V Supply ON or OFF.
Figure 5-2. Internal System Control Schematic