Input voltage requirements for Orange Pi PC?

bronco · Published in 2015-11-22 20:17:21

Edited by bronco at 2015-11-24 16:42

Hi,

I just had a look into the Orange Pi PC's schematics (obviously partially wrong/copy&paste from other Xunlong SBC since there's no S/PDIF, Wi-Fi and so on). I searched the net for the datasheets of the used converters and ended up with:

Power tree according to schematics:

DC IN through barrel jack or GPIO header: 5V/2A (directly used for "SPDIF/USBHost/HDMI")

RT9050-33GB: 3.8V-5.5V input voltage range, provides 3.3V/300mA (AVCC)
SY8008B: 2.5-5.5V input voltage range, provides 1.2V/1A (DRAM)
SY8089A: 2.7-5.5V input voltage range, provides 1.2V/2A (SYSTEM)
SY8106A: 4.5V-18V input voltage range, provides 1.0-1.5V/3A (VCC-CPUX adjustable via I2C)
AMS1117-3.3: 4.5V-15V input voltage range, provides 3.3V/0.8A (VCC-IO)
uP0107BMA5-00: ? input voltage range, provides 1.8V/300mA for (VCC1V8-DRAM/LPDDR) and 3.3V/300mA (VCC-RTC)

Can anyone please help me to understand the AMS1117-3.3 datasheet regarding minimum and maximum input voltage? And does anyone have a datasheet for the 2 used uP0107BMA5-00 (but I don't care that much since as far as I understand the OPi PC doesn't use LPDDR and I don't care at all about the RTC).

Background: We want to evaluate if it's possible to feed the OPi PC with just 4.5V (no USB peripherals and no display, but using passive PoE with 5.5V/6V you will experience voltage drops over larger distances. And being able to know 'how low can you go' would help). Thx.

DEAD · Published in 2015-11-24 02:09:35

Edited by DEAD at 2015-11-24 02:11

AMS1117-3.3:
min: 3.3 + Dropout Voltage = 3.3 + 1.3 = 4.6V, but typ: 3.3 + 1.1 = 4.4V
max: 15V from ABSOLUTE MAXIMUM RATINGS

hojnikb · Published in 2015-11-24 14:58:30

DC IN through barrel jack or GPIO header: 5V/2A (directly used for "SPDIF/USBHost/HDMI")

RT9050-33GB: 3.8V-5.5V input voltage range, provides 3.3V/300mA (AVCC)

If 5V rail is indeed directly feeded to the USB (which it seems it is as i've tested myself) it should only accept 4.75V-5-25V, as this is the maximum toleranece for usb devices.

Something to keep in mind when plugging cheap power supplies, as they can go well beyond 5.25V

bronco · Published in 2015-11-24 16:34:29

hojnikb replied at 2015-11-24 14:58
If 5V rail is indeed directly feeded to the USB (which it seems it is as i've tested myself) it sh ...

BTW: Does anyone has real schematics for Orange Pi PC? The link above (from one of Steven's posts) says these are OPi PC's schematics but this is not true since these seems to be the schematics of 'Orange Pi Plus' (Wi-Fi, internal USB hub, GL830 USB-to-SATA bridge mentioned). Sharing schematics between older H3 models would be ok since these boards are all the same more or less but the PC has a different PCB layout and different components.

So I doubt that searching in the schematics for protection circuitry is rather useless if these schematics don't match with the PCB?

bronco · Published in 2015-11-27 20:23:21

Today I gave 4.5 V a try (used a step-down converter and inserted power with jumper wires through GPIO pins 2 and 6). I used 'undervolted' settings since I don't want to heat the building but let the OPi PC do some real work powered over Ethernet with as less heat and energy consumption as possible.

The fex settings below were used and scaling_max_freq reduced to 720 MHz:

[dvfs_table]
pmuic_type = 2
extremity_freq = 1296000000
max_freq = 1200000000
min_freq = 480000000
LV_count = 7
LV1_freq = 1200000000
LV1_volt = 1200
LV2_freq = 1104000000
LV2_volt = 1160
LV3_freq = 1008000000
LV3_volt = 1120
LV4_freq = 960000000
LV4_volt = 1060
LV5_freq = 816000000
LV5_volt = 1000
LV6_freq = 540000000
LV6_volt = 960
LV7_freq = 480000000
LV7_volt = 920

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I then started cpuburn-a7 on all cores and let cpufreq-ljt-stress-test check stability:

Testing CPU 0
720 MHz ............................................................ OK
648 MHz ............................................................ OK
600 MHz ............................................................ OK
504 MHz ............................................................ OK
480 MHz ............................................................ OK
Testing CPU 1
720 MHz ............................................................ OK
648 MHz ............................................................ OK
600 MHz ............................................................ OK
504 MHz ............................................................ OK
480 MHz ............................................................ OK
Testing CPU 2
720 MHz ............................................................ OK
648 MHz ............................................................ OK
600 MHz ............................................................ OK
504 MHz ............................................................ OK
480 MHz ............................................................ OK
Testing CPU 3
720 MHz ............................................................ OK
648 MHz ............................................................ OK
600 MHz ............................................................ OK
504 MHz ............................................................ OK
480 MHz ............................................................ OK
Overall result : PASSED

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So probably passive PoE with inserted 5.5V-6V might even work over larger distances since voltage drops down to 4.5V seem to be no problem

Temperatures (with heatsink and vertical orientation) under full load 29°C above ambient temperature and 16°C when being idle:

bronco · Published in 2015-12-13 05:08:23

Today I tested the Orange Pi PC with connected camera module, undervoltead 'headless' settings and 4.5V DC-IN inserted through GPIO pins 2 and 6: Camera works at 4.5V

Also the reliability tests work with a connected camera at 4.5V with my undervolted Vcore settings: I let 4 threads cpuburn-a7 run and then cpufreq-ljt-stress-test on top:

root@OrangePI:~# cpufreq-ljt-stress-test
The cjpeg and djpeg tools from libjpeg-turbo are not found.
Trying to download and compile them.
CPU stress test, which is doing JPEG decoding by libjpeg-turbo
at different cpufreq operating points.
Testing CPU 0
1536 MHz SKIPPED
1440 MHz SKIPPED
1344 MHz SKIPPED
1200 MHz ............................................................ OK
1104 MHz ............................................................ OK
1008 MHz ............................................................ OK
912 MHz ............................................................ OK
816 MHz ............................................................ OK
720 MHz ............................................................ OK
648 MHz ............................................................ OK
600 MHz ............................................................ OK
504 MHz ............................................................ OK
480 MHz ............................................................ OK
408 MHz SKIPPED
312 MHz SKIPPED
240 MHz SKIPPED
120 MHz SKIPPED
60 MHz SKIPPED
Testing CPU 1
1536 MHz SKIPPED
1440 MHz SKIPPED
1344 MHz SKIPPED
1200 MHz ............................................................ OK
1104 MHz ............................................................ OK
1008 MHz ............................................................ OK
912 MHz ............................................................ OK
816 MHz ............................................................ OK
720 MHz ............................................................ OK
648 MHz ............................................................ OK
600 MHz ............................................................ OK
504 MHz ............................................................ OK
480 MHz ............................................................ OK
408 MHz SKIPPED
312 MHz SKIPPED
240 MHz SKIPPED
120 MHz SKIPPED
60 MHz SKIPPED
Testing CPU 2
1536 MHz SKIPPED
1440 MHz SKIPPED
1344 MHz SKIPPED
1200 MHz ............................................................ OK
1104 MHz ............................................................ OK
1008 MHz ............................................................ OK
912 MHz ............................................................ OK
816 MHz ............................................................ OK
720 MHz ............................................................ OK
648 MHz ............................................................ OK
600 MHz ............................................................ OK
504 MHz ............................................................ OK
480 MHz ............................................................ OK
408 MHz SKIPPED
312 MHz SKIPPED
240 MHz SKIPPED
120 MHz SKIPPED
60 MHz SKIPPED
Testing CPU 3
1536 MHz SKIPPED
1440 MHz SKIPPED
1344 MHz SKIPPED
1200 MHz ............................................................ OK
1104 MHz ............................................................ OK
1008 MHz ............................................................ OK
912 MHz ............................................................ OK
816 MHz ............................................................ OK
720 MHz ............................................................ OK
648 MHz ............................................................ OK
600 MHz ............................................................ OK
504 MHz ............................................................ OK
480 MHz ............................................................ OK
408 MHz SKIPPED
312 MHz SKIPPED
240 MHz SKIPPED
120 MHz SKIPPED
60 MHz SKIPPED
Overall result : PASSED

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No heatsink used, ambient temperature at 23°C:

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niticent · Published in 2020-1-10 22:56:55

Can these schemes be used for all types of systems? Or just for this case?