I2C Read sequence AD5144A

Hi m-kun,

The readback sequence should be:

Start-->slave address (R)-->ACK-->control+address-->ACK-->data bits-->ACK

During readback, you also have to specify the control+address bits for I2C communication.See table 14 on the data sheet for more details.

Thanks and best regards,

Rainier

Hi Rainier-san,

According to below url:

http://www.nxp.com/docs/en/user-guide/UM10204.pdf 

(I refer to page 14of64 and Fig 11. )

After slave address(R) ACK ,  master become receiver .

I think that write address is required for table 14's command.

Regards 

m-kun

Hi m-kun,

For example you want to read the contents of the RDAC register. You will need to send command 2.

start-->slave address (R)--> ACK(slave)-->command 2-->ACK(slave)-->data-->ACK(master).

• command 2 is C3:C0 + A3:A0

If the sequence above doesn't work. Kindly send a scope shot of your clock and data lines.

Thanks and best regards,

Rainier

Thank you for your  sequence.

And we can use below sequence , can't  we?

(below is AD5671 datasheet )

Hi m-kun,

Yes you can try to use the sequence on the AD5761R.

Best regards,

Rainier

Hi Rainier-san

start-->slave address (R)--> ACK(slave)-->command 2-->ACK(slave)-->data-->ACK(master).

I think that AD5144A don't receive  command 2 after slave address (R).

start-->slave address (W)--> ACK(slave)-->command 2-->ACK(slave)-->restart--> slave address (R)-->  ACK(slave)-->  data-->.

This sequence is right in AD5144A ,too.

Regards 

m-kun

 

This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

Thank you,
EZ Admin