Hello, guys.
We consider using nRF52840 SoC as the main CPU in our future project but before that, we would like to evaluate different aspects of the SoC.
One of the things under current evaluation is the Radio transmitting current for different values of the transmission power parameter.
On page 61 of the nRF52840 product specification, it is stated that the radio transmission current @-40dBm output power, 1Mbps BLE, HFXO clock, and DC/DC regulator (probably in Normal voltage mode), is typically around 3.83mA.
My first question is about the VDD voltage used in the above measurements. Did you use VDD = 3.0V or something different?
We used the PPK II tool to measure the current consumption of our sample app with the following configuration:
- -40dBm output power,
- 1M BLE PHY used
- HFXO oscillator used
- DC/DC regulator enabled (Normal voltage mode)
- VDD = 3.0V
Here is what we have captured for the current consumption at the moment we send one BLE advertising packet:
Can you help us understand which part of this graph can we use for measuring the radio transmission current? Can we consider that the first part of the TX interval has been used to wake up the HFXO?
Thanks in advance for your time and efforts.
Sincerely,
Bojan.
