microSD & PSoC 3 3.3V not working | Cypress Semiconductor
microSD & PSoC 3 3.3V not working
I have a problem with writing on a microSD connected directly to a PSoC 3 (CY8C3246PVI-147). It is set to work at 4MHz, and everything is OK when the PSoC is powered at 5V. However, when I power the PSoC at 3.3V, the microSD operations take a lot more time (tens of sceconds), and nothing is written on the memory card.
Is there a problem with the PSoC outputs, not being able to command the microSD at 3.3 V power supply? If so, is a buffer chip required between the PSoC and the microSD?