[RE Mote] Enabling uSD
A production batch of the RE-Mote revision B has been manufactured enabling as default the PA6 and PA7 pins as ADC/AINx channels, whereas the expected would be to connect to USD_SEL and USD_CSN to enable the Micro-SD card holder. The following instructions explain how to identify if the Micro-SD is enabled or not in your RE-Mote revision B, and how to configure one way or another, in case you also would prefer to use these pins as additional ADC input channels or input voltage references.
The RE-Mote revision B schematics can be found Here
To use the Micro-SD you will need to solder two 0Ohm resistors, or just short-circuit the pads using a drop of tin. Note as default the RE-Mote revision B have this resistors already mounted, and only a small batch of RE-Motes were dispatched without these. Please check beforehand if the resistors shown next are already placed or not.
You can use the following resistors P/N: ERJ-3GEY0R00V
The next images show the position of the R33 and R26 0Ohm resistors:
The red sticker shown on the photos below is covering the micro-SD holder, to find the R33 resistor locate the Micro-SD holder first.
Placing the resistor:
Short-circuiting instead:
If you prefer to use PA6 as an ADC input channel or ADC voltage reference, then desolder the above.
Placing the resistor:
Short-circuiting instead:
If you prefer to use PA7 as an ADC input channel or ADC voltage reference, then desolder the above.