General Category > Discussion - Hardware
FT230XS
(1/1)
mikes603:
Hi Gents,
I had/have an issue where our FT230XS is supplying current into our MCU over the FT230XS's TX and RX lines. And keeping the MCU a bit alive across reboots. Some current limiting resistors seem to be needed on these two lines. But I'm curious if this is a common issue / known limitation. Are series resistors the suggested design? And what is going on with the FT230XS whereby it can supply current on TX/RX?
FTDI Community:
Hello,
Can you please email your local support team and we can look into this issue further?
https://www.ftdichip.com/FTContact.htm
Then you can post any resolution here to help other community users.
Best Regards,
FTDI Community
cioma:
It's a known phenomenon in electronics: unpowered chip gets powered trough its internal ESD protection diodes when its signals are driven high.
The right way to deal with it is to use buffers with so-called Ioff feature (e.g. TI SN74AUP1G34) or a dual-supply voltage translators (e.g. ON FXMA2102).
Using series high-value resistors is not ideal as it will make signal edges very slow.
Navigation
[0] Message Index
Go to full version