NRF5340 Deviation calibration

[GinoWang]

HI,

   

To ensure NRF5340 2.4G rf consistency during mass production, which scheme do you suggest is more suitable  （X2 = 32MHZ 10ppm）:

1、Offset capacitance C36 C37 placed(C36 C37 =10pF 10ppm.     10pF is temporary，The exact value will be selected according to the frequency bias of the actual hardware test

),Frequency deviation is not calibrated by software during production

2、Offset capacitance C36 C37 empty，Use software to calibrate frequency deviation during production

3、Offset capacitance C36 C37 placed，at the same time,Use software to calibrate frequency deviation during production

[ketiljo]

You can use either external load caps or the internal ones, if the crystal CL values isn't too high.

You will typically not change this as part of the production test. The internal cap value is a static value, based on your design. No need to change this once you find a value that works well.