DAC8775: Open Circuit Condition

Nithin D

Prodigy 50 points

Part Number: DAC8775

Tool/software:

Hi,

I am working on DAC8775.

In the datasheet of DAC8775, under alarm section, there are some error in which open circuit is one of them.

When is the open circuit condition generated? Because there is no fault bit raised in status register and the Alarm pin doesn't go low.

DAC8775 is configured in current mode 4mA-20mA. count given was 0x7FFF.

I have attached the schematic below for your reference.

One more doubt, open short circuit condition is only for current mode or can it be used for voltage mode also?

Regards,
Nithin D

10 months ago

0 Lucas Burnette 10 months ago

TI__Expert 4710 points

Hi Nithin,

I am reviewing this and will get back to you shortly.

Thank you,
Lucas

0 Lucas Burnette 10 months ago in reply to Lucas Burnette

TI__Expert 4710 points

Hi Nithin,

To verify, you have been able to read other registers and get data back? You aren't just receiving 0x0000?

I would also make sure the fault for the channel is unmasked in the Status Mask register.

Can you also verify the output is changing when you write to the DAC?

Open circuit detection is for current output mode, while short circuit detection is for voltage output mode.

Thanks,
Lucas

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DAC8775: Open Circuit Condition