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RX_TX_Voltage_LEVELS.txt
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RX_TX_Voltage_LEVELS.txt
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____________________________________________________________________________________
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!PLEASE THIS IS MY EXPERIENCE YOUR DEVICES MAY DIFFER FROM MINE I OFFER NO GARANTEE!
!----------------------------------------------------------------------------------!
!!!!!!!!!!!!!!!!!!! REMEMBER I DELIBERATELY BLEW IT UP !!!!!!!!!!!!!!!!!!!!!!!!!!!
____________________________________________________________________________________
************************************************************************************
This is my experience with the devices I have purchased.
The Vcc MUST BE 3V at ALL TIMES.
However I have now tested 1 X ESP8266-01 to Destruction and the results
are very encouraging.
This is not so crazy as you may expect,
The cost £2.02
The Why? I started as a Test Engineer in 1987 and we never believed manufacturers
SPEC!, sometimes EVEN as a matter of organisational PROCEDURE!!!.
The Tx(input as GPIO_X) Rx input Levels 3v to use level shifters, Resistors..........
The device functioned PERFECTLY at 5V logic I/O, both as I/O AND UART.
The device starts failing at 5.9v with no APPARENT damage.
I then ran the device at both 3v and 5v Logic levels for some hours.
The PERMANENT DAMGE OCCOURS AT 6v ECL(Vacuum Tube), the device internal diode fails.
The diode that fails indicates the presence of a schotky diode protecting the inputs (ESD Protection)
therefore 5v LOGIC LEVEL with some impedance (500R+) is PERFECTLY SAFE for NORMAL OPERATION.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!PLEASE THIS IS MY EXPERIENCE YOUR DEVICES MAY DIFFER FROM MINE I OFFER NO GARANTEE!
!----------------------------------------------------------------------------------!
!!!!!!!!!!!!!!!!!!!!!!!!!!! REMEMBER I BLEW IT UP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!