Hi, Nordic.
Our company has a product made with 52833 chip, and the working environment needs to meet minus degrees Celsius. However, in the experiment, it is found that once the working temperature reaches - 10 ℃, the Bluetooth RF will not work. The main performance is that Bluetooth cannot scan and broadcast, but the serial port, watchdog and other peripherals work normally.
I suspect it is the problem of crystal oscillator. Casually, there is no external 32.768KHz crystal oscillator on this product, only 32mhz crystal oscillator.
And the configuration of crystal oscillator in the program is as follows:
#define NRF_SDH_CLOCK_LF_SRC 0 #define NRF_SDH_CLOCK_LF_RC_CTIV 16 #define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 2 #define NRF_SDH_CLOCK_LF_ACCURACY 1
And also tried the following configuration, but also failed to make it work properly:
#define NRF_SDH_CLOCK_LF_SRC 2 #define NRF_SDH_CLOCK_LF_RC_CTIV 0 #define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 0 #define NRF_SDH_CLOCK_LF_ACCURACY 7
I don't know what the problem is? According to the instructions in the chip manual, the 52833 chip should be able to withstand low temperature up to - 40 ℃, right?
Incidentally, after the abnormality occurs in the low temperature environment, the Bluetooth cannot work normally even if the product is transferred to the room temperature environment. The product must be powered on again to work normally.
I look forward to hearing from you soon!!!
Regards,
June6
