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LP-CC1312R7: 32kHz calculations and DC-DC converter coil for CC1312R7

Part Number: LP-CC1312R7
Other Parts Discussed in Thread: CC1312R7


I am looking at the require analog adjustment to customise the reference design LP-CC1312R7 and accommodate some of the parts we are using in other designs.

Regarding the 32kHz xtal oscillator  

Where can i find "the Typical I/O pin capacitance " for pin x32kQ1 and x32kQ2? Are they ~5pF ?

This would be needed to calculate the required capacitors for the 32kHz xtal oscillator.

Where can i find more information GM crit in uA/V  for the CC1312R7 with different 32kHz crystal vendors or how the drive level for the 32kHz xtal oscillator is controlled ?

I didn't find much either in the datasheet for the CC1312R7 or the technical reference manual SWCU192.

Have second source been investigated for the 6.8 uH coil used in the DC-DC converter ?

What was the basis for selecting TDK MLZ2012N6R8LT000 for example instead of TDK MLZ2012M6R8HT000?

Is a DC resistor up to 1 ohm still acceptable ?

The DC resistor is lower than other parts from the same supplier or other suppliers but i would expect that for 14 dBm applications, the DC-DC converter current would remains below 80 mA in either tx or Rx mode.

(i.e. assuming roughly for that to compensate for a voltage drop of 50%, the DC current would increase by ~50% . With a Tx current of ~35 mA this gives an expected current of 70mA for the DC DC converter.