Dave, read my follow up messages, wrote lots of messages here in the list. I put the Pi 5 inside the sBitx (no external PSU anymore). It is working fine, no glitches, even when stressing all the CPUs to 100%, the voltage drops to 4.91 V, while under normal load, I get 5.09 V (vcgencmd pmic_read_adc EXT5V_V). Temperature peaks at 85 deg Celsius ( vcgencmd measure_temp) under heavy stress. As soon as I stop stressing it, it goes back fast to the 60s range.
- Rafael
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On 1/2/24 20:36, Dave, N1AI wrote:
On Tue, Jan 2, 2024 at 11:39 AM, Rafael Diniz wrote:
I'm still using a stock external (non USB PD) USB 15W power supply
for early assessments. So I can say nothing about enough power
from the sBitx yet.
So, how does that work?? You are plugging Pi 5 into the sbitx, so does it know to not use the power coming in from the GPIO pins and use the USB-C path?? I was having a hard time figuring out if I had to modify the sbitx to not put power onto the GPIO pins if I chose to use external power for the Pi 5.? ?Yet I think we both would like to find power settings that would allow us to still use the GPIO pins for power while staying within the capabilities of the sbitx's regulator to deliver power.
But lower clocks would not hurt as the Pi 5 CPU is much faster anyway.
Agree.? There is so much faster about the Pi 5 beyond the CPU clock rate. For instance it has something like 2x the bandwidth to main memory, can read sdcard faster, etc.? ?IMO this is not about tech nerds playing with the new toy, it's about moving forward with the times.
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Regards,
Dave, N1AI
