nRF52832: Warmup time shorter than stated in datasheet

[Lukas Krupp]

Hello everyone,

my question is related to the time interval t_TXEN = 140 μs from the radio timing table in the datasheet of the nRF52832-SoC (http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fradio.html). With a configuration for 1MBit/s BLE I was able to measure an interval of 130 μs between the task TXEN and the event READY with an adjustment of the frequency. So I would like to know if  t_TXEN is dependant on the configuration of the transceiver. Is this the reason for the difference between my measurement and the value stated in the datasheet? 

Best regards

[Susheel Nuguru]

Hi Lukas,

Is this the reason for the difference between my measurement and the value stated in the datasheet? 

It must be depending on the configuration of the transceiver in a very tiny range (probably 2us) , The value given in the spec would be the worst case time that must have been seen on some chips as Nordic gives the safe values noticed on many chips instead of wrapping the numbers with best result obtained in only one chip. If you are trying to make use of this in your system, I would recommend you to design it considering that the worst case tTXEN might reach 140us.