would any TI products be suitable for "harvesting" (or "scavenging") energy from RS232 lines, and using that to charge a battery or supercapacitor?
In particular, to use only the data line - not the modem control lines.
There's plenty of things like this:
But it relies upon RTS & DTR - and the "host" maintaining them in a steady state.
And it doesn't address battery/supercap management.