AWR1843BOOST: How to measure the "SYNC_OUT" signal from AWR1843

Not sure we understand.

You can use a scope.

Thank you

Cesar

Hi,

Thanks for your reply. "Not sure we understand" it means you guys can't understand how to measure or? 

We read the data sheet both of 1243 and 1843, both of them have pin "SYNC_OUT". We  already config. the pin (SYNC_OUT) of 1843 but we still can not see the signal from oscilloscope. 

Is that pin only can observe from 1243? for the cascading purpose? 

Looking for your feedback! 

Thank you very much! 

Best regards,

JC

Hello JC,

You can measure the signal on the AWR1843. Where are you trying to probe the signal?

If you are trying to probe on connector J6, you need to populate resistor R108 with a 0 ohm to bring this signal out to the connector. It is the resistor indicated by the red arrow on the below picture:

Regards,

Adrian 

Hi Adrian, 

Thanks for your kind reply!! Actually we already measured PAD that you suggested to us but we still cant not see the "SYNC_OUT" signal by using oscilloscope. If we want to observe that signal, do we need to config.? 

We try to power on AWR1843 then directly to measure that PAD still can't observe. Then even we config.... we still can not observe that signal...  So that is why we feel strange and do not know how to figure this! 

Could you give us more advice about this part?! Thank you very much!!! 

PS: the pin (AR_SYNC_OUT_SOP1) of the pic. is we measured pin. 

Best regards,

Jun

Hello Adrian,

Thanks for your quick response and kind reply. We already tried Config. the pinmux but still can not see the "SYNC_OUT" signal from 1843. Could you tell us more detail about the config. part? We worry about something we missed or did mistake when configuration. 

It is really thanks for your help! Thank you very much!! 

Best regards,

Jun

Hello Jun,

Can you share the code snippet where you have updated the pinmux just so that we can verify that it is correct? It should be the same as how you would configure the pinmux for any other signals so you can refer to examples in existing code or use the pinmux tool:

Regards,

Adrian

Hi Adrian, 

Thanks for your kind response! Here is our code: 

Hello Jun,

Your pinmux setup looks fine. I believe everything should be setup correctly so you should be able to see a trigger on the SYNC_OUT. The pulse width of the SYNC_OUT is only around 25ns, so maybe it is too short for you to capture on the scope?

Would it be possible for you to connect it to another board that is expecting a HW trigger and confirm that it is working in that context?

Regards,

Adrian

Hi Adrian, 

Thanks for your kind reply!  We already setup the trigger to capture the signal by using oscilloscope but still can't see it.  

We think 1243 definitely can observe this signal, but can't understand why couldn't from 1843... 

Thank you so much! 

Best regards,

Jun