I have one question, if Nordic can give some confirmation, that Nordic chips can be used together
with Murata XRCGB32M000F1H00R0.
Customer just asks for that I don’t know why they need it..
Could you help us with this confirmation letter or something?
Hi.
It is not straight forward to answer this question.
Whether or not a crystal can be used depends on that the crystal follows the crystal requirements.
To answer that you have to take into account several things, such as frequency tolerance, frequency shift by temperature (what the surrounding temperature of the device is), frequency aging (how long do you expect the device to work within the tolerance).
These tolerances combined must be below the max ppm requirement of the chip you wish to use the crystal with. There is different max ppm requirement for the low frequency crystal oscillator and the MHz crystal oscillator (high frequency crystal oscillator). And there are also different requirements for different radio operations what I mean by this is for example: For the MHz crystal oscillator, there is one max ppm requirement for 2.4 GHz proprietary radio applications, one for BLE applications with packet length <= 200 bytes, and one for BLE applications with packet length > 200 bytes. The Low frequency crystal oscillator also have different requirements for different radio operations.
In the datasheet for the crystal you linked you can find this, where the last line (XRCGB32M000F1H00R0) lists the different max ppm for frequency tolerance, frequency shift by temperature, and frequency aging.
You have to calculate your tolerance based on these three things and see if your value is below the max ppm requirement for the radio operation in the chip you wish to use.
If you want full flexibility Bluetooth radio operations (long packets), the max ppm for the nRF52840 is +/- 30 ppm, as you can read in the product specification for nRF52840 in the infocenter.
The product specification for nRF52840's electrical specification can be found here.
These links also shows the load capacitance, shunt capacitance and so on.
Best regards.
Andreas
Hi.
It is not straight forward to answer this question.
Whether or not a crystal can be used depends on that the crystal follows the crystal requirements.
To answer that you have to take into account several things, such as frequency tolerance, frequency shift by temperature (what the surrounding temperature of the device is), frequency aging (how long do you expect the device to work within the tolerance).
These tolerances combined must be below the max ppm requirement of the chip you wish to use the crystal with. There is different max ppm requirement for the low frequency crystal oscillator and the MHz crystal oscillator (high frequency crystal oscillator). And there are also different requirements for different radio operations what I mean by this is for example: For the MHz crystal oscillator, there is one max ppm requirement for 2.4 GHz proprietary radio applications, one for BLE applications with packet length <= 200 bytes, and one for BLE applications with packet length > 200 bytes. The Low frequency crystal oscillator also have different requirements for different radio operations.
In the datasheet for the crystal you linked you can find this, where the last line (XRCGB32M000F1H00R0) lists the different max ppm for frequency tolerance, frequency shift by temperature, and frequency aging.
You have to calculate your tolerance based on these three things and see if your value is below the max ppm requirement for the radio operation in the chip you wish to use.
If you want full flexibility Bluetooth radio operations (long packets), the max ppm for the nRF52840 is +/- 30 ppm, as you can read in the product specification for nRF52840 in the infocenter.
The product specification for nRF52840's electrical specification can be found here.
These links also shows the load capacitance, shunt capacitance and so on.
Best regards.
Andreas
