Hello, I am currently trying to design a custom PCB to plug into the SD card slot, such that I can have higher performance using a secondary MCU. My problem is choosing the MCU, for which I need to know the following: How much current can the SD slot give?
Answer 1: None, the SD slot is a passive element.
Answer 2: The SD slot is powered by the ALD01 output of the AXP2101. According to the data sheet the maximum load capacity for ALD01 is 300mA.
Thank you! That is actually a bit higher than I expected. I will be sure to mind it.
As for your first answer, I don’t quite understand; wouldn’t the PCB/SD draw power as soon as it is inserted?
The power consumption depends on the consumer (device) inserted into the SD socket. The SD socket is just a connector for a consumer device. It is difficult to find exact information, the wikipedia entry on SD card indicates 20-100 mA at a supply voltage of 3.3V