2022-07-06 07:34 PM
I'm designing power supply part of STM32WB55 microcontroller.
I'll use a Li-ion battery for power supply of STM32WB55 microcontroller.
As we know, the microcontroller requires 3.3 V maximum but Li-ion battery can generate maximum 4.2 V.
So, I'll use internal LDO in microcontroller to supply proper voltage from 4.2 V.
However, here is a problem in RF power supply, VDDRF.
I think VDDRF requires 3.3 V but currently I have only one option (4.2 V).
My question is that is it possble use 4.2 V for VDDRF?
or if I apply 4.2 V to LDO, LDO can generate 3.3 V in VDD?
or LDO can supply power to VDDRF internally?
Solved! Go to Solution.
2022-07-07 01:35 AM
Again, what does the datasheet say?
That will list both Absolute Maximum and Operating Maximum values ...
"I think VDDRF requires 3.3 V"
No need to just "think" - the datasheet will tell you for sure.
You really do need to take time to study the datasheet.
2022-07-07 01:35 AM
Again, what does the datasheet say?
That will list both Absolute Maximum and Operating Maximum values ...
"I think VDDRF requires 3.3 V"
No need to just "think" - the datasheet will tell you for sure.
You really do need to take time to study the datasheet.