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Topic: pcf8574p port expander addressing (Read 1 time) previous topic - next topic


Can anyone elaborate on the addressing of this chip?  With A0, A1, and A2 connected to ground the address is

Code: [Select]
#define expander B00100000

How do i go about changing the address?  What is the alternate to connecting the addressing pins to ground and how would that correlate with the #define statement?


It's in the data sheet for more detail. But the last 000 ( B00100(000) are corresponding to pins A0,A1,A2 of the chip itself. Your two options are gnd or V+. So for example:
If you put A0 and A1 to V+ and A2 to Gnd the address would be =

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