Constant TX power without DTM

[A.P]

Hi!

We're working on a testing Jig which should test our units in production.

One of the tests I'd like to make, is measure the current draw on TX at max (8dBm). I would like to do this without flashing my devices with a different firmware than the one I plan to be using for testing, so flashing them with the DTM example will not work.

What I'm looking for is a way to tell me SD- transmit as if you are in TX, with 8dBm power, until I tell you to stop. It does not even have to be BT packages, as long as the power draw simulates a TX event which follows BT protocol well.

Is there a sequence of register values (or SD commands) I can write which will perform the action I've described? If so, what are the values I need to write to stop the TX?

We're using an nrf52833 based device, with SD S113.

Thanks!

[Kenneth]

Hi,

The softdevice does not have such functionality. I recommend to add a test pin, and at startup the application can check the level of the test pin to decide if it should run application or production test. Then you can run the radio test or DTM if the test pin for instance is high. This will increase the size of the firmware a bit, but I would not expect dramatically. Also check out:

https://infocenter.nordicsemi.com/topic/struct_appnotes/struct/appnotes_nan34.html 

Kenneth