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CC2640R2F: CC2640R2F

Alex Stilpans
Prodigy 140 points

Part Number: CC2640R2F
Other Parts Discussed in Thread: CC2640, LAUNCHXL-CC2640R2

Hi, we had problems installing the cc2640 processor, it happens that the legs close.
The question is why in the datasheet the processor has 48 contacts, a width of 0.24 mm (link  https://www.ti.com/lit/ds/symlink/cc2640.pdf?ts=1665335621332), and in the example LAUNCHXL-CC2640R2 (link https://www.ti.com/lit/zip/swrc335) 0.3 mm? How to do it right? Does it matter to take a foil thickness of 35 microns or 18 microns?

  • 0
    TI__Guru**** 171639 points

    Hi,

    Although the mechanical aspects are the same, one detail is that both links you sent refer to different devices.

    Although larger than the soldermask shown in the datasheet, the difference in the pad/mask sizes is quite narrow and was probably a tolerance requirement of our assembly house.

    In this case, I am unsure what may be happening with the assembly house that is causing the pins to be shorted, as the reflow process has many variables that will depend on their specific process. 

    The copper layer thickness is chosen according to the typical thickness (plus tolerances) of standard 0.5oz and 1.0oz PCB (one reference). They are also chosen to guarantee the tracks and the ground plane can carry enough current without negatively influencing the performance of the circuit.

    Best regards,

    Rafael