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That's something different alltogether. Errm, you do in fact have no idea what a UART is, right? I really suggest to do a bit recherche. You _may_ find some (old!) cell phone USB cables that are in fact USB-UART adapters, but they most likely will _not_ have micro USB connectors but proprietary cell phone connectors. And I don't think they ever went as low as 1.8volts. 5v or 3.3v is much more typical. You need to search a bit for usb-to-1.8v-uart adapters, I guess. Not many of them. It's probably easier and cheaper to modify a 3.3volt one (with input level tolerance to go down to 1.8v, it's just a voltage divider - i.e. two resistors).
I guess you need to do a lot of reading if this doesn't ring a bell already. And soldering on such fine structures will be a tough job if you never did before.
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