Update to the USB Micro Connector for Eagle EDA Tool
Today we have an update to our MicroUSB-RIGHT connector in the Eagle MF-Connectors Library. We changed the footprint to reduce DRC errors!
FT_Prog and Programming the FT230X
I mentioned FT-Prog in my last blog post. FT-Prog is a utility to program the EEPROM on FTDI devices.
USB UART Interface on the Cheap
With USB interfaces on microcontroller devices a USB connection always adds significant cost to the design.
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February 15, 2015
For USB powered devices, controlling the power consumption is important. As documented in the USB2.0 specification, the maximum power draw possible for normal devices is 500mA at 5V. This level of current draw is only possible after enumeration with the host: before enumeration every device must be a low-power USB device and only draw a maximum of 100mA at 5V. The easiest way to handle this is to have the rest of the device off until enumeration can happen then turn the rest of the device on. The FT230X supports controlling a P-Channel mosfet for high side power control.
Before enumeration, the FT230X and the 2 powered LEDs will be pulling 26mA which is well under the limit of 100mA. After enumeration the PWREN signal gets pulled low opening up the P-Channel mosfet allowing power to flow to the rest of the system. Care should be taken to limit the system current to under the 500mA limit. A resettable PTC fuse with a rating of 500mA can be placed in series with the L1 inductor to limit the maximum current of the system.
The FT230X will require flashing via FT_Prog which I covered in a previous post. CBUS1 set to TX&RXLED#, CBUS3 set to PWREN#, and “Force Power Enable” setting needs to be enabled.
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