And another issue has come up
Everything worked fine for some time since I removed socket for arduino and soldered connections directly to it, but today MCP2025 started doing some weird stuff with the bus.
I don't have oscilloscope to test, but using voltage meter I measured bus voltage and it is jumping between 5-6V. As soon as MCP2025 is disconnected bus voltage is stable.
Once I have some freetime I will be replacing MCP2025 to see if chip is defective, but just wanted someone else to check what I have right now.
Let's begin. TX and RX line are a straight connection. VREG has 10uF 50V capacitor. RESET is connected to VREG via 1K resistor. CS/LWAKE pin is connected to arduino pin directly.
I am missing diode for CS/LWAKE pin only because CS/LWAKE is not being connected to VBATT (12V). Missing are resistor, capacitor and what I assume schottky diode on VBATT pin. Capacitor is specified at 10 * VREG capacitor, which would put it at 100uF, correct? But then resistor (Rtp) is kinda vague to me and I have no idea what it should be. Lastly, schottky diode on bus pin is also missing.
I am sorry for beating dead horse with a stick, but I am in desperate need of some help.