PeterO wrote: ↑Tue Sep 03, 2019 7:12 am
ProDigit wrote: ↑Tue Sep 03, 2019 1:16 am
Hi,
Is it possible to use a higher arm frequency when the lightning icon is displayed?
So you want to make the PI draw even MORE current when it is already showing low voltage warnings because the PSU is struggling to maintain the voltage high enoughit ?
PeterO
The pi 3B+ is measured at around 1A 5W if I'm not mistaken.
My PSU is a dual USB unit, providing 3.2A split over the display (0.5A) and the Pi 3B+. The pi should be provided with 2A, and an additional 0.4A reserve. In theory, as each port is Max rated 2,4A. I shouldn't even be able to see the lightning icon.
The fact that my pi (with LCD hat) arm freq runs fine at 1510Mhz, GPU at 525, Ram at 525 without errors, shows that there's some fine tuning needed in the way the 3B+ handles power, and that there's no need for 600Mhz throttling.
Perhaps when running the pi at stock frequencies, I won't get the lightning icon, as it sometimes appears and disappears. I guess I'm running it right on the threshold.
At best, I'd say arm freq 1,2Ghz throttling at 2A, and 600Mhz when voltage drops further (1,5A? I believe I've booted the pi with a 1500mA charger before.
Perhaps disable overclocking at below 2A, as most USB adapters on the market are 2A, 10W, and the pi runs fine even overclocked at those power figures.