INA233: slave address issue

SMART

Part Number: INA233

The custom board have eight current IC (INA233) and a mcu.

Read port 1 - The slave address set 0x80 and 0x81, status register and READ_IN(89h) are correctly.

- slave addr set 0x80 or 0x81 , read READ_IN are the same.

Read port 2, port 3, port 4 , port 5, port 6, port 7 port 8 - the slave address set 0x82 and 0x83, status register and READ_IN(89h) are not correctly.

Port 2 slave addr become 0x88 , 0x89.

Port 3 slave addr become 0x82 , 0x83.

Port 4 slave addr become 0x8A , 0x8B.

Port 5 ~ Port 8 cannot get correct value for READ_IN.

Could TI member give any suggestion?

over 8 years ago

0 Jason Bridgmon over 8 years ago

TI__Genius 14825 points

SMART,
While I'm checking out your other questions in the lab today, I'll see about this as well and let you know what I find. For reference, I'll be using the INA233EVM to validate the addresses.

0 Jason Bridgmon over 8 years ago in reply to Jason Bridgmon

TI__Genius 14825 points

SMART,

I hope I found what's going on - I was reading table 2 of the data sheet and setting the jumpers and I saw what you saw - that port 2 was 88, 89. Then I looked and noticed that the headers of the table show A1 and then A0, where I was reading it as A0 then A1. This makes sense as when it is A0=A1=GND, then the port is 80/81. When A1=GND and A0=VS, then you see port 82/83. However, if you flip them so that A1=VS and A0=GND, then you would see port 88/89.

Let me know if flipping your A0 and A1 bit addressing doesn't solve the communication issues.

0 SMART over 8 years ago in reply to Jason Bridgmon

Intellectual 860 points

This is circuit A0 and A1 bit addressing

0 Jason Bridgmon over 8 years ago in reply to Jason Bridgmon

TI__Genius 14825 points

SMART,

to me it looks like ports 1-4 line up perfectly with the data sheet, and for port 5, did you try 98/99? I believe that's what it should be.

Amplifiers

Amplifiers forum

INA233: slave address issue