5.1 VBAT Battery Power Leakage

In some scenarios, the M.2 and SODIMM interrupt sources can cause a VBAT battery power leakage. This can occur through the interrupt pins when a daughter card is attached. The purpose of these interrupt sources is to wake up the MPU from Low-Power modes.

To determine if there is a power leakage:
  1. Unpower the board, insert a coin battery in the BT1 connector and make sure no daughter card is attached.
  2. Remove jumper JP2 from header J4.
  3. Measure the current through the battery.
  4. Connect the daughter card.
  5. Measure the current again.
If the current is higher than the current previously measured and the wake-up functionality is not required, remove the corresponding diode:
  • D6 for the M.2 interface
  • D7 for the SODIMM interface

If the wake-up functionality of the daughter card is required, make sure to remove the daughter card connected to SAMA7D65-Curiosity while not using the board, to save battery life.