SN75DP130's address read and write

Jimmy Hsu

Prodigy 30 points

Other Parts Discussed in Thread: SN75DP130

I can read and write the I2C address as following the Fig1.

I often can't read and write I2C address as following Fig2.

The Fig3 is my command that I read address from 05h to 0Ch continuously on the monitor.

Obviously SN75DP130 is unusual.

over 8 years ago

0 fhoude over 8 years ago

TI__Mastermind 23156 points

Hello Jimmy,

I have moved this to the appropriate forum.

-Francis Houde

0 Moises Garcia over 8 years ago in reply to fhoude

TI__Mastermind 23815 points

Hi Jimmy,

So I guess the problem is:
Sometimes you can write the register address and sometimes you can't, right?
I see the capture with write NAK has more noise, how are you setting I2C address? have you tried the other two addresses?

Regards

0 Jimmy Hsu over 8 years ago in reply to fhoude

Prodigy 30 points

thanks

0 Jimmy Hsu over 8 years ago in reply to Moises Garcia

Prodigy 30 points

Yes, sometimes I can write and sometimes I can't.
I think other signal to effect to the I2C bus, too.
I will close other chip example CPU and CPU...etc and try it continuously.
I have ever other address and get the same result.

0 Moises Garcia over 8 years ago in reply to Jimmy Hsu

TI__Mastermind 23815 points

Hi Jimmy,

I think DP130 could be getting some noise in ADDR pin, and not choosing its address properly, could you check the voltage level there?

Could you try a different DP130 sample?

Regards

Interface

Interface forum

SN75DP130's address read and write