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Does teh community have any schematics of Cerbo IO inputs?
Neither appear galvanically isolated. Analogue input appear to have 1.1k pull-up resistor to a 4.9V supply and digital inputs appear very high impedance. Do I have that about right?
Many thanks.
You're not far off.
Temperature inputs have a 1.2KΩ pullup to 5V
Tank inputs have a 680Ω pullup to 5V
Digital inputs have a diode clamp and a 22KΩ series resistor followed by a 10KΩ pullup to 1.2V
Here is the VenusGX schematic - the inputs are similar configuration as the CerboGX, the difference is the digital inputs pull up to 3.3V
https://github.com/victronenergy/venusgx-hardware/blob/master/VE_BBB_Cape_v0.80_released.pdf
just to clarify,
for the tank inputs - is the Cerbo the same? as Venus .
that is the Cerbo pulls up thru 680ohm to 5V?
(its only the digital inputs that differ?)
That's really fab. Thank you.
