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PCF8574 and PCF8574A I2C Address Map

Last modified: 
Sunday, December 14, 2014 - 14:20


L  = VSS (ground)
H = VDD (supply voltage  2.5V – 6V)
A 2 A 1 A 0 PCF8574 PCF8574A
L L L 20 (hexadecimal) 38 (hexadecimal)
L L H 21 (hexadecimal) 39 (hexadecimal)
L H L 22 (hexadecimal) 3A (hexadecimal)
L H H 23 (hexadecimal) 3B (hexadecimal)
H L L 24 (hexadecimal) 3C (hexadecimal)
H L H 25 (hexadecimal) 3D (hexadecimal)
H H L 26 (hexadecimal) 3E (hexadecimal)
H H H 27 (hexadecimal) 3F (hexadecimal)


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The steps given have worked for me with out a problem, but i will not be held responsible for how you use the information or what the out come of the use does for you.
If there is something that could cause problems or there is a risk in doing it, i have noted that - and done so for good reason. Google and Yahoo are great resources, so please use them also.


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