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Fused USB to UART adapter This is yet another USB to UART adapter, or is it? The revision of my previous USB to UART adapter M180v3, and it opened new possibilities. Now there are two models corres...Read More…
This is yet another USB to UART adapter, or is it? The revision of my previous USB to UART adapter
M180v3, and it opened new possibilities.
Now there are two models corresponding to this module:
M180v4 for 5V operation and
M181v4 for 3.3V operation.
The unregulated version is not available yet. If you need such an unregulated adapter, you can still buy
M180v3 which is half a dollar cheaper. It will not go away for a while, since it is a few millimeters smaller than
M180v4 and can fit in some places
M181v4are now sharing the same PCB but shipped with different operation voltages using jumper configuration.
M180v4operates at 5V and
M181v4operates at 3.3V.
AMS1117-3.3regulator footprint is added back to allow switching between 3.3V and 5V operation. Only populated in
M181v4-Rvariants with a different 3.3V filter cap.
There is a total of 35 models of
M180v4 variants available. Here is an explanation what does the model numbers mean.
The model number consists of, in sequence:
M180v4: USB to UART adapter, 5V operation.
M181v4: USB to UART adapter, 3.3V operation.
R: With 3.3V auxiliary regulator. (
M181v4always have the auxiliary regulator)
F05: 500mA polyfuse.
F1: 1.1A polyfuse.
F2: 2A polyfuse. (not available when auxiliary regulator is installed)
Red: Red LED.
Amb: Amber LED.
Grn: Green LED.
Pgn: Pure Green LED.
Blu: Blue LED.
For example, the model number
M181v4-RF05Amb stands for "3.3V USB to UART adapter with 500mA polyfuse, auxiliary regulator and amber power indicator LED"
AMS1117-3.3regulator is removed after experiments revealed a way to make the internal regulator inside
CH340Gchipset, plug and play on Windows 7+, OS X and Linux, and immune to either FTDIgate or Prolific fake chip ban.
This project is created out of my own necessity: I had a few dodgy
PL2303-based USB to UART modules, and the recent Prolific driver update and FTDIgate killed them. However the one of my friends'
MCS-51 development board did not suffer from this plague of drivers disabling devices, and it is based on this
I bought a few of those
CH340G chips (which are an order of magnitude or two cheaper than both
PL2303 by the way) and initial breadboard testing was a great success, with one problem: the internal 3.3V regulator is a little bit problematic. This issue is tamed in the otherwise ill-fated
M180v2 PCB so this
M180v3 inherited this part of the circuit.
I did have one mishap with the breadboard though: I was being a fool and connected a chip in reverse, shorting out the power rails on the USB port. The short circuit current draw immediately upset my MacBook's USB port and caused it to be shut down. (Thanks Apple for the superior protection circuitry, should this happened while it is connected to my years-old Lenovo desktop it will definitely let the magic smoke out of my chip and probably take out the computer's motherboard too) I decided to make sure whenever USB power is used on my further projects it is definitely fused.
During this test while minding other projects, I snapped the Micro-USB jack on my Arduino Leonardo clone, took the traces with it and damaged the board beyond repair. A sad me had to take out my hot air gun and disassemble the Leonardo just to recover the parts, and swear not to use those easily damaged jacks on my projects ever, especially those jacks that will subject to lots of wear and tear like USB.
Here comes my design, a USB to UART adapter based on the
CH340G chipset, with the same SparkFun pinout, an extra-durable through-hole USB Type A plug, and a fused power rail.
There exists a
M180v2 revision after the original
M180 sold out, but it was ultimately scrapped.
M180v2 PCB have all the features this
M180v3 have, but instead of a through hole USB Type A plug soldered onto the PCB, a Type A plug was designed directly onto the PCB - that is, a card edge connector that should mate with a USB Type A socket - but this design was not reliable - not even with any kind of help I can think of.
M181v4for 3.3V operation?
Back when I was selling the original
M180v1 I had a design, called
M181v1, that is suitable for 3.3V operation, based on
M180v1 but had a different PCB layout. That was the first design of the
M181 line, although it somehow never left the drawing board.
When I began designing
M180v4 there was some requests about a 3.3V variant of the
M180 line. So instead of producing a separate PCB to fulfill this sector I designed M180v4 PCB with operation voltage selection in mind, resulting the merger of the two models
M181. Now the
M181 became synonym of "
M180 with 3.3V operation voltage". When you order
M181v4 you will get a PCB marked as
M180v4, but with a jumper selection making it operating at 3.3V.
You can hack this board for your own purposes!
AMS1117-3.3regulator yourself but that will also require replacing the 3.3V filter capacitor.
I am Max, a college student major in computer engineering and dabbles in electronics engineering. This is one of my just-for-fun spare time projects.
This board is hand assembled by myself. Made in Shanghai with love, it will not be your one-hang-low Shenzhen crap.
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Péter | Jan. 3, 2016
Josh | Sept. 5, 2015
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I am Max, a college student major in computer engineering and dabbles in electronics engineering.
Some products are built to order. All products Made in Shanghai with love.