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:
- Unpower the board, insert a coin battery in the BT1 connector and make sure no daughter card is attached.
- Remove jumper JP2 from header J4.
- Measure the current through the battery.
- Connect the daughter card.
- 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.