MAX9768 I2C Address

Hello bmcdaniel,

This is the old 7-bit verses 8-bit address confusion. 

The 7-bit address is only the address of the part, nothing else. 

That address is shifted to the left by one bit and the Read/Write bit is added making it the full 8-but address where there is one for read and one for write. 

Here is the full 8-bit address:

As you can see it is 0x97 for a read and 0x96 for a write command. 

If you shift this over to the right one bit so the read/write bit is not included and add a zero in the MSB, you get this for the address:

0x4B if the ADDR2 and ADDR1 are both high. 

Often the I2C built in routines in a microcontroller just needs to be given the 7-bit address and it will deal with shifting it and adding the read/write bit. 

You will have to check your software.

Dave T

Hi Dave,

That was indeed the case, I was able to write to the device as needed, in my case I padded the msb with a 0 resulting in an address of 0x4b.  Thank You.

Hi Dave,

That was indeed the case, I was able to write to the device as needed, in my case I padded the msb with a 0 resulting in an address of 0x4b.  Thank You.