Consider +3.0V supply instead of +3.3V supply

drewsum commented 8 months ago

PIC32MZ DA supports a +3.0V VDDIO, and the FLIR lepton is limited to +3.0V IO. Consider consolidating these instead of having two supplies

drewsum commented 8 months ago

I don't think we'll be able to swing this based on just how much on this board already needs +3.3V... most LCDs I'm seeing need +3.3V, the oscillators I'm already comfortable with are +3.3V only, USH hub, etc. So I'm going to close this for now

drewsum commented 8 months ago

Things that would need to move from +3.3V to +3.0V in order to make this work:

PIC IO (doable)
Telemetry circuits (INA219 has min VIN +3.0V, MCP9804 ok)
TPS62130 does not come in a fixed +3.0V option, could use feedback resistors
Check to see if PIC KIT 4 is compatible with +3.0V
PIC oscillators (current part is +3.3V only, oscillator I found for FLIR sensor is +3.0V compatible)
SD card
SPI Flash
SQI Flash
LCD (most options I'm seeing out there are +3.3V only)
USB UART level shifter/voltage domain isolator
Battery manager/fuel gauge
DS1683 (this should be ok)
All LVC logic gates (should be ok, maybe move to AUP family?)

There is a lot here, but it's not impossible. I think the main deciding factor is if we can find a usable +3.0V IO-compatible TFT LCD screen.

According to the SD card spec, you can power micro SD cards with as low as 2.7V: https://www.sdcard.org/developers/sd-standard-overview/

drewsum commented 8 months ago

I decided that based on what I've seen for LCDs, and the availability of parts that are indeed +3.0V VDD tolerant, we should do this.

drewsum / Thermal_Camera

Consider +3.0V supply instead of +3.3V supply #7