Electronics > Projects, Designs, and Technical Stuff
Cypress CY7C65213A-Based RS232 Adapter & Power Supply
Gandalf_Sr:
This is a continuation of a thread I started here.
The first board I built was too wide (for a standard breadboard) so I shrunk the width, it's now 36 x 21.5 mm. I also did away with the PTC as it dumped power whenever any load was drawn.
What I ended up with is a CY7C65213A USB-serial adapter, which includes a small power supply (components under the PCB). It is plug and play with many operating systems and enables serial communications with low voltage PCBs using RS232 (ground referenced) voltages as low as 1.7V The power supply section offers 3 (shared ground) supplies of 5V, 3.3V, and 1.7V – 4.2V adjustable. It's built and tested and I have several spare PCBs.
The small FT232 PCBs that you can get for $5 are OK but they:
a. Can only be used at 5V or 3.3V levels
b. Have very limited power output capability (if any)
c. The really cheap ones from Banggood and Aliexpress have fake FTDI chips on them which can mess up your communications
Design files are in the next post and there's a couple of pictures below.
Gandalf_Sr:
Here's the design features:
• Supports RS232/RS422/RS485 interfaces at data rates up to 3 MBps
• Unique serial number means each device will assign and reserve a COM port for each adapter
• Compatible with USB 2.0 and USB 3.0 host controllers
• Driver support for Windows/IOS/Linux/Android - typically plug and play
• Configurable signals using free USB-Serial Configuration Utility available from Cypress
• Supports USB battery charging & USB break signal through user-configuration
• Tx (red) and Rx (orange) LEDs provided for at-a-glance activity indication
• Power available is 5V@500mA, 3.3V@800 mA, and 1.6V – 4.2V@600mA (within limits of host USB supply)
• Jumper-selectable input/output voltage (VIO) of 5V, 3.3V, or adjustable using trimmer pot
• All pins broken out on headers to provide full access including 8 GPIO pins
• Standard Arduino-style 6-pin connector (J5) provides VIO and Ground as well as DTR
• Small 0.7” width allows plugging into 0.1” breadboards with 2 spare holes either side
• Uses reliable micro-USB connector (more reliable than mini-USB connector)
• Tiny 36 x 21.5 mm board with 3 header connectors
[EDIT1] 4/9/20 Added schematic vn1f and BOM as .pdf
[EDIT2] 4/10/20 Added user guide vn 2 as .pdf
WattsThat:
Excellent idea and well done, thank you. Let us us know if you have unpopulated boards you want to sell.
coromonadalix:
Nice board :-+
Dont want to be a nag, but sparkfun has almost the same design ?? at 13.95$ usd
https://learn.sparkfun.com/tutorials/sparkfun-usb-uart-breakout-cy7c65213-hookup-guide
But yours has the adjustable output
Gandalf_Sr:
--- Quote from: coromonadalix on April 09, 2020, 08:34:02 pm ---Nice board :-+
Dont want to be a nag, but sparkfun has almost the same design ?? at 13.95$ usd
https://learn.sparkfun.com/tutorials/sparkfun-usb-uart-breakout-cy7c65213-hookup-guide
But yours has the adjustable output
--- End quote ---
Interesting, I am not trying to compete with anyone. I actually screwed up with my PCB order by sending the same Gerbers for what were supposed to be 2 different designs so now I have 200 of my 4-layer ENIG PCBs for this design that I don't need. PM me if you want any, they will not be free but close.
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