I’m designing my own carrier board (to allow mating to the RPi CM4), and I want to make sure I’m correct on these. Thanks in advance for answering my dumb questions.
Some questions on pin usages.
-
If I’m providing 3.3V elsewhere all the time, I should leave VDD_3V3_SPEKTRUM_EN floating and provide 3V3 as an input to IO_VDD_3V3, correct?
-
It is OK to leave the nRESETs for the IO and FMU floating, correct?
-
The “Safety” button input. Should it normally be 5V VDD and tie to ground on press? Or normally ground and tie to 5V vdd on press?
-
I’m using a single 5V input with no redundant switching. So that means I should tie the 5V VDD input to VDD_5V_IN_PROT, set VDD_BRICK_VALID to 5V, VDD_BACKUP_VALID to 0, and VBUS_VALID to 0, correct?
-
The LED outputs are mirrors of the ones on the cube itself?
-
What is the power spec on the standard brick? Is it 5V or 5.5V? How much current?
-
The buzzer output is a PWM modulated output that can directly drive a transistor which drives a buzzer, correct?