RTOS/LAUNCHXL-CC26X2R1: Simple broadcaster tx power

Hi Joakim,

Thanks for your answer. I noticed that changing DEFAULT_TX_POWER does the right job too. Changed it to 7 which should be 0dBm. TX current is then 8.2mA instead of 7.5mA which is given in the datasheet. Do I missunderstand something?

Regards,
Manuel

Hi Manuel,
What hardware are you using? I common mistake is to not consider other active components on the HW.

Do you see the correct processing and sleep consumption?

Hi Joakim,

I am using a LAUNCHXL-CC26X2R1 board. There are also some deviations to the datasheet in relation to the current consuption in sleep mode. At a voltage of 2V the sleep current is 300nA which is too low. At 3V the sleep current goes up to 310uA which is way too high.

Measurements are done with a Keysight N6705B poweranalyzer and the simple broadcast example with an intervall time of 100ms.

Best regards,

Manuel

Manuel,
Have you made any modifications to the on-board external flash? That one might be active when you are doing the measurements and it will still draw current in sleep.

Joakim,

No I did not made any changes. I repeated now my measurements without the Flash PWR zero ohm restistor. Still the same behaviour.

Best regards,
Manuel

That's odd,
Could you share a capture of the power profile?

Hi Joakim,

Of course I can. Here is a screenshot of the measured sleep currents at 3.0V (44.541uA) and 1.8V (107nA). As I understand from the datasheet, the sleep current should be arround 3uA at 3V.

Best regards,

Manuel

Hi,

The standby current between the advertising event should be slightly less than 1uA @ 3V so I am not sure what is going on in your setup. Have you tried other intervals? Also, have you verified that you have good enough resolution on the measurements?

Hi Joakim,

Yes, I have tried different intervals. The only thing that changes with a longer interval is the appearance of some recharge impulses while sleeping. The resolution is high enough.
I also found out that the sleep current is below 1uA right after startup. Then it increases over time.
Do you have some similar measurements for comparison?

Best regards,
Manuel

Hi Manuel,
Do you have any more findings on your end? I do not understand how you are able to obtain the inconsistent data. Could you share a picture of your setup?

Hi Joakim,

Unfortunately I did no progress. Here is a picture of my measurement setup. The two cables go to the power analyzer. Standard simple broadcaster example is used.

Here is also a screenshot of a longer measurement. The current is zoomed in so one can see really good the rising of the sleep current:

Best regards,
Manuel

- The current consumption when doing TX will be slightly different from the datasheet when you measure with a PCB antenna as output since this is not perfect 50 ohm. If you terminate the JSC connector with 50 ohm (require some soldering to select this) and terminate you should get closer. Also you have to ensure that the MCU is in sleep when doing the measurements.

- To simplify a bit, do you see the same if you run the pinStandby example?

Hi,
Have you enabled any UART activity in the SW example? If so, (or either way actually) could you please try to put a jumper on the RX?