DAC8741H: Control register (0x02) write isseu

Hi Mukesh,

I am not sure what your question is - are you having difficulty communicating with the device?

Thanks,

Paul

Hello Mukesh,

On your DAC8742H, what is the state of IF_SEL pin when you start up the device? You want to ensure that it is high after power up to communicate in SPI mode.

Regards,

Reza

Paul,

I am able to read control register of DAC8741 but not able to write control register of DAC8741.

I am sending below command to write control register,

Byte-1 : 0x02,  Byte-2: 0xA0 and  Byte-3 :0x42. 

I am using SPI with Mode - 1 and MSB first is configured.

Thanks,

Mukesh Prajapati.

Hello Reza,

I am using DAC8741H,  not a DAC8742H.

If your above question is same for DAC8741H, then I do not found any IF_SEL pin with DAC8741H pin configuration and functions.

Please tell me where is that pin. 

Thanks,

Mukesh Prajapati

i

Hello Mukesh,

You are right, the DAC8741H does not have IF_SEL pin. That is for the DAC8742H. 

How do you confirm that you are unable to write to the registers? Are you able to write and read back any other registers? 

To test, can you write 0x1234h to addr 0x25 and then readback to confirm the data?

Also, can you send oscope shots of your SPI frame for my review? Thanks.

Regards,

Reza