Hello, I’m about to buy the Sodaq ubee, but I have some questions regarding the product’s schematic.
The schematic can be found here: http://support.sodaq.com/wp-content/uploads/2018/04/sodaq_ubee.pdf
- I’m reading the schematic and there are some points I don’t quite understand.
Are the R1 and R2 at the TX and RX internally connected to the module, or I have to put them manually later? (BLUE)
- What is the ON/OFF line at pin 9 of the header? It doesn’t seem to be connected to anywhere on the SARA. I had assume that it was connected to the ON/OFF port in the SARA part (RED)
However, the ON/OFF line of the header is active low signal, while the ON/OFF port for EN of the MIC94040 is active high, which means if I were to set the /DTR pin low, then the battery to VCC for SARA module will be cut off (EN = 0). The same question for the Level converter part.
Please correct me if I’m wrong. I’m doing a project with my company so the part selection phase is very important. We want to understand the module wholly before buying it.