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Forum Index : Microcontroller and PC projects : CP2102 with USB-C connector....
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9593 |
These modules are still being produced, and I love that they are now doing a USB-C version, vs the older Micro-USB socket. CP2102 with USB-C... Still very affordable. Edited 2024-12-27 17:27 by Grogster Smoke makes things work. When the smoke gets out, it stops! |
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 7865 |
Not the same chip but just as effective, I use the USB-C version on all my designs (where the Pico's USB is needed for a hub) at the moment. 2 things to watch: 1: The data pins have pull-up resistors to the incoming 5V supply. That means that you need a level shifter of some sort with a RP2040 or with a RP2350 that isn't powered. 2: The USB-C version has an on-board 0.5A fuse on the incoming 5V rail (well, mine do). USB-C is capable of more than this but they assume you are using a USB-A to USB-C lead so you are restricted to USB-A current level. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9593 |
My new USB-C modules have arrived, and appear to be pin-for-pin compatible, and of the exact same size.  Interestingly, the top module(micro-USB) in this photo, the chip is "Blank" - no markings, so most likely a clone. The TXD and RXD leds that NORMALLY blink on these modules, don't on this one, and the silkscreen is pretty flaky. The new USB-C ones I got, appear to use the genuine chip, as you can easily read the chip markings, and the silkscreen seems much more "White" then the other one. These could be clones also, but the TXD and RXD LED's blink on the new USB-C ones, and they APPEAR to use genuine chips - date code is 30th week of 2022... Smoke makes things work. When the smoke gets out, it stops! |
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| apalert Newbie  Joined: 06/07/2023 Location: AustraliaPosts: 35 |
Data pins on my recently purchased unit are 0 - 3.3V Edited 2025-01-03 17:27 by apalert |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7865 |
Which modules are those ? Have you got a link please? Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2611 |
Grogster's photo shows the RXI terminal going to 3.3V via a LED and 220Ω. That would indicate the data pins are 3.3V. The first post gives the link. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7865 |
I'd better start using those then! :) I've just traced the circuit of the purple CH340E modules (marked BTE17-06B) that I've been using. This is a different chip, as I said before. It has an internal 3V3 regulator, brought out as expected, but it is not used by the output stage. All outputs are 5V. These modules are cheaper, I think, and have so far proved to be reliable so, if the 5V restriction is ok, I can still recommend them. They are fine with the RP2350 providing it is powered as the GPIO is rated for 5V. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2540 |
I use one with olimex board and pico2 usb. smaller than other usb to ttl with micro usb socket.  |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2540 |
I meant these usb to ttl. connected to 2040 usb and logic levels works, should have tested first though. these need a female usb connector or plug into laptop pc  |
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| apalert Newbie Joined: 06/07/2023 Location: AustraliaPosts: 35 |
Sure, it was eBay item no 204454582793 |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7865 |
Thanks. Yep, the one I thought. :) I'll put two or three on my next AE order. Edit... I'm going to have to be careful. The +5 and GND pins are reversed from the CH340E. :) Edited 2025-01-04 07:13 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9593 |
Here you are: LINK... Smoke makes things work. When the smoke gets out, it stops! |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7865 |
I have a couple (along with a load of other stuff - why stop when you are on a AE roll?) ordered now. They are actually longer and slightly more expensive than the purple ones that I've been using so I won't be using them as a complete swap over, they have their place. :). I'm pretty sure that the TX and RX pins of the CH340 are not open drain as they can sink (4mA) and source current (3mA). This makes them useful if you need a bit of drive. Additionally, the single TXRX LED on the purple module is driven from the TNOW signal, which goes high on TX. This can be used for the DE line of a RS-485 driver to make a USB-RS-485 converter. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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