Using 3V3 pin on T4

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Rawi

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Hi!
I am using an extern microSD card with teensy 4, can i use the 3V pin(3V3 250 mA max) as vcc for the micro SD card?
 
Yes, most SD cards run on 3.3V so that would be the expected wiring method. One thing to watch for is that writing flash memory is quite power hungry, possibly up to 100mA so if you are doing high rate writes factor that in the power budget. For just reading the values are 5-10% of that.
 
Hi GremlinWrangler!

I think it will be 400 KB/m writing rate(using Class 10 Ultra SDHC) data logging, is it better to have Voltage regulator from 5V to 3V3 or the T4 can deliver 100 mA to the micro SD card?
 
Per the 250mA max note on the reference card 100mA for the SD card is not a problem unless you are also powering other things that eat into that capacity. Be aware that the standard SD card library working in SPI mode does not achieve the full throughput of a high performance card, but if your target is 400 kB a minute you should be fine.
 
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