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Author Topic: FT230X USB Bus Powered with Power Switching Configuration  (Read 215 times)

adrian

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FT230X USB Bus Powered with Power Switching Configuration
« on: October 09, 2020, 10:38:39 AM »

Hello,

In the FT230X datasheet, there is an application description with switching the usb power with a MOSFET. I am wondering if this circuit actually works. I think it would just work if the CBUS3/PWREN# output switches between output low and hi-Z. But i couldn't find anywhere in the datasheet a description that this happens. If the output just switches to output high, the 3.3 V IO voltage wouldn't be enough to switch the MOSFET.

I am wondering how it works?
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Re: FT230X USB Bus Powered with Power Switching Configuration
« Reply #1 on: October 09, 2020, 04:36:16 PM »

Hello

Please see TN_162 Bus Powered with Power Switching Configuration which should help.
   
Best Regards,
FTDI Community
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adrian

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Re: FT230X USB Bus Powered with Power Switching Configuration
« Reply #2 on: October 12, 2020, 07:29:27 AM »

Hello,

Okay, thanks. This document confirms my suspicion. The circuit "Bus Powered with Power Switching Configuration" in Figure 6.3 in the FT230X datasheet doesn't work.

Best Regards,
Adrian
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