Electronics > Microcontrollers

FTDI does not shutdown after power off

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wraper:

--- Quote from: fsonnichsen on February 04, 2021, 03:02:08 am ---HOWEVER----the FTDI needs to be powered by at least 4V (as we don't have an external crystal) so we power it from the USB bus at 5V.

--- End quote ---
4V for VCC, not VCCIO

--- Quote ---This of course creates a discrepancy between Vcc and VCCIO (5V vs 3.3V).  Is that OK?  Well-not sure from the datasheet.
--- End quote ---
Datasheet shows more than clearly they don't need to be the same, and explicitly says that VCCIO can be powered from 3.3V output. I wonder how did you even came up with a dumb conclusion they should be the same.
Also, are you blind, or what? It was already given to you on a silver platter.

--- Quote from: wraper on February 03, 2021, 02:14:35 pm ---
--- Quote ---VCCIO
+1.8V to +5.25V supply to the UART Interface and CBUS group pins
(1...3, 5, 6, 9...14, 22, 23). In USB bus powered designs connect this pin
to 3V3OUT pin to drive out at +3.3V levels, or connect to VCC to drive
out at 5V CMOS level. This pin can also be supplied with an external
+1.8V to +2.8V supply in order to drive outputs at lower levels. It should
be noted that in this case this supply should originate from the same
source as the supply to VCC. This means that in bus powered designs a
regulator which is supplied by the +5V on the USB bus should be used.
--- End quote ---

--- End quote ---

aholtzma:
Does anyone know if the VCC/VCCIO same source constraint applies to FT230X or FT231X? The docs for these parts don't have the "same source as as the supply to VCC" verbiage.

peter-h:
Would be interesting, especially since those parts are much cheaper than the FT232 which has become an extortionists' paradise.

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