2024-03-09 08:39 PM
Hi everyone,
I am currently working on a PCB design using a Bluenrg-332ac chip. The official PCB design guideline has a resistor marked "X" as shown on the left of the figure below. But I saw the resistor soldered on the eval board. Can anyone explain whether we keep the resistor or not in the PCB design?
Reference files: AN5526 STEVAL-IDB012V1
Solved! Go to Solution.
2024-03-12 06:21 AM
Hello,
This resistor should not be there.
BlueNRG gives you flexibility to use or not internal SMPS. It is a matter of power consumption versus BOM saving .
If using SMPS, then R1 must not be set
If SMPS is not used, then R1 must be set and L1/L2 are not used.
Regards
Laurent
2024-03-12 06:21 AM
Hello,
This resistor should not be there.
BlueNRG gives you flexibility to use or not internal SMPS. It is a matter of power consumption versus BOM saving .
If using SMPS, then R1 must not be set
If SMPS is not used, then R1 must be set and L1/L2 are not used.
Regards
Laurent
2024-03-28 08:44 AM
Hi Laurent,
Thank you for your reply! I also want to ask if we remove R1 here, do we still need to connect the VBLUE to the circuit?
Regards,
Jason
2024-03-28 08:54 AM
Hello Jason,
If you do not set R1 , it means you will use internal SMPS (so you will have L1 and L2 set).
SMPS must be activated by SW (CONFIG_HW_SMPS_10uH)
Then Vblue is used to supply other Vdd pins of the BlueNRG-LPS (VDDSD, VDDRF, VDD1 and VDD2)
Laurent