Review MicroMod Design

[brtaylor]

Hi all,

Wondering if I can get a review of a (hopefully) simple design, attached below? Teensy 4 MicroMod with a micro USB and push button for programming and a SD card for logging data. VDD is assumed to be 5V and there is also an external 3.3V regulator. Mostly trying to understand whether USB_VIN is needed for programming (I think it is) and whether I've missed any inputs for this minimal design.

Schematic:
View attachment temp.pdf

Thanks!
Brian

 

[KurtE]

Sorry I am no expert... My play designs are on the opposite end... i.e. don't want to leave any square inch untouched

My guess is that you probably need to connect USB_VIN, could be wrong, as not sure what happens if for example you cut the trace on MEASURE... it breaks the connection between VUSB and VIN, but the only thing I see is the two connections to usb vbus on the teensy chip... And if connected to the two capacitors for VIN... And the only thing I see VIN connected to was a test point... I might have missed something.

 

[Neal]

You may have already done this, but take a look at the schematic for the Sparkfun ATP Carrier Board they have to support a basic Micromod configuration. They have the USB_VIN connected to the MM and it comes from the USB connector. Here is the schematic link:
https://cdn.sparkfun.com/assets/2/9/5/8/1/MicroMod_ATP_Carrier_Board_Schematic.pdf