PCF8574 and PCF8574A I2C Address Map

Post date:

Sunday, July 13, 2014 - 04:52

Last modified:

Tuesday, July 9, 2019 - 17:05

Reference: http://www.ti.com/lit/ml/scyb031/scyb031.pdf

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)

Disclaimer:
The information found here has been created to help people.
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.
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