CM5 Carrier Board Design Help

krtn

krtn

what is that usb-> uart bridge
231 days

flux

0:32

Accessing knowledge base.

Explaining USB to UART Bridge.

A USB→UART bridge is a small IC that converts USB data signals into standard UART (TX/RX) logic-level serial signals. It lets your CM5 (or any host with USB) communicate with UART-based devices—like GPS modules, debug consoles, or serial sensors—without using extra GPIO pins.
Key points:
  • The bridge appears on the host as a virtual COM port (USB CDC)
  • It provides TX, RX, RTS, CTS lines at 3.3 V (or 1.8 V) logic levels
  • Common examples include FTDI’s FT232R, Silicon Labs CP2102, and WCH’s CH340
Typical integration:
  1. Connect the bridge’s USB D+ and D– pins to your CM5’s USB2.0 D+ / D– differential pair
  2. Route its VBUS sense and 5 V input to your power rail
  3. Wire the bridge’s TXD and RXD to the UART RX/TX pins on your CM5 header
  4. Optionally use RTS/CTS for hardware flow control
If you’d like to pick a specific bridge IC, let me know (for example, FT232R or CP2102) and I can find the exact part in the Flux library. Alternatively, here’s a generic search:
choose CP2102
omit flow control
FT232R footprint
VBUS connection
add decoupling caps
231 days
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Seeed Studio XIAO RP2040

Seeed Studio XIAO RP2040 thumbnail
The Seeed Studio XIAO RP2040 is as small as the Seeed Studio XIAO SAMD21 but it's more powerful. On one hand, it carries the powerful Dual-core RP2040 processor that can flexible clock running up to 133 MHz which is a low-power microcontrollers. On the Seeed Studio XIAO RP2040 there is also 264KB of SRAM, and 2MB of on-board Flash memory which can provide more program to save and run. On the other hand, this little board has good performance in processing but needs less power. All in all, it is designed in a tiny size as small as a thumb(20x17.5mm) and can be used for wearable devices and small projects. #RP2040 #PICO #XIAO #SeeedStudio

Properties

files.seeedstudio.com/wiki/XIAO-RP2040/res/rp2040_datasheet.pdf

Seeed Studios

Microcontroller

102010428

wiki.seeedstudio.com/XIAO-RP2040/

U

creativecommons.org/licenses/by/4.0/

Pricing & Availability

Distributor

Qty 1

Controls