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Input voltage requirements for Orange Pi PC?

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Post time 2015-11-22 20:17:21 | Show all posts |Read mode
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.

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Post time 2015-11-24 02:09:35 | Show all posts
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

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Post time 2015-11-24 14:58:30 | Show all posts
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
 Author| Post time 2015-11-24 16:34:29 | Show all posts
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?
 Author| Post time 2015-11-27 20:23:21 | Show all posts
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:
  1. [dvfs_table]
  2. pmuic_type = 2
  3. extremity_freq = 1296000000
  4. max_freq = 1200000000
  5. min_freq = 480000000
  6. LV_count = 7
  7. LV1_freq = 1200000000
  8. LV1_volt = 1200
  9. LV2_freq = 1104000000
  10. LV2_volt = 1160
  11. LV3_freq = 1008000000
  12. LV3_volt = 1120
  13. LV4_freq = 960000000
  14. LV4_volt = 1060
  15. LV5_freq = 816000000
  16. LV5_volt = 1000
  17. LV6_freq = 540000000
  18. LV6_volt = 960
  19. LV7_freq = 480000000
  20. LV7_volt = 920
Copy the Code
I then started cpuburn-a7 on all cores and let cpufreq-ljt-stress-test check stability:
  1. Testing CPU 0
  2.   720 MHz ............................................................ OK
  3.   648 MHz ............................................................ OK
  4.   600 MHz ............................................................ OK
  5.   504 MHz ............................................................ OK
  6.   480 MHz ............................................................ OK

  7. Testing CPU 1
  8.   720 MHz ............................................................ OK
  9.   648 MHz ............................................................ OK
  10.   600 MHz ............................................................ OK
  11.   504 MHz ............................................................ OK
  12.   480 MHz ............................................................ OK

  13. Testing CPU 2
  14.   720 MHz ............................................................ OK
  15.   648 MHz ............................................................ OK
  16.   600 MHz ............................................................ OK
  17.   504 MHz ............................................................ OK
  18.   480 MHz ............................................................ OK

  19. Testing CPU 3
  20.   720 MHz ............................................................ OK
  21.   648 MHz ............................................................ OK
  22.   600 MHz ............................................................ OK
  23.   504 MHz ............................................................ OK
  24.   480 MHz ............................................................ OK

  25. Overall result : PASSED
Copy the Code
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:



 Author| Post time 2015-12-13 05:08:23 | Show all posts
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:
  1. root@OrangePI:~# cpufreq-ljt-stress-test
  2. The cjpeg and djpeg tools from libjpeg-turbo are not found.
  3. Trying to download and compile them.
  4. CPU stress test, which is doing JPEG decoding by libjpeg-turbo
  5. at different cpufreq operating points.

  6. Testing CPU 0
  7. 1536 MHz SKIPPED
  8. 1440 MHz SKIPPED
  9. 1344 MHz SKIPPED
  10. 1200 MHz ............................................................ OK
  11. 1104 MHz ............................................................ OK
  12. 1008 MHz ............................................................ OK
  13.   912 MHz ............................................................ OK
  14.   816 MHz ............................................................ OK
  15.   720 MHz ............................................................ OK
  16.   648 MHz ............................................................ OK
  17.   600 MHz ............................................................ OK
  18.   504 MHz ............................................................ OK
  19.   480 MHz ............................................................ OK
  20.   408 MHz SKIPPED
  21.   312 MHz SKIPPED
  22.   240 MHz SKIPPED
  23.   120 MHz SKIPPED
  24.    60 MHz SKIPPED

  25. Testing CPU 1
  26. 1536 MHz SKIPPED
  27. 1440 MHz SKIPPED
  28. 1344 MHz SKIPPED
  29. 1200 MHz ............................................................ OK
  30. 1104 MHz ............................................................ OK
  31. 1008 MHz ............................................................ OK
  32.   912 MHz ............................................................ OK
  33.   816 MHz ............................................................ OK
  34.   720 MHz ............................................................ OK
  35.   648 MHz ............................................................ OK
  36.   600 MHz ............................................................ OK
  37.   504 MHz ............................................................ OK
  38.   480 MHz ............................................................ OK
  39.   408 MHz SKIPPED
  40.   312 MHz SKIPPED
  41.   240 MHz SKIPPED
  42.   120 MHz SKIPPED
  43.    60 MHz SKIPPED

  44. Testing CPU 2
  45. 1536 MHz SKIPPED
  46. 1440 MHz SKIPPED
  47. 1344 MHz SKIPPED
  48. 1200 MHz ............................................................ OK
  49. 1104 MHz ............................................................ OK
  50. 1008 MHz ............................................................ OK
  51.   912 MHz ............................................................ OK
  52.   816 MHz ............................................................ OK
  53.   720 MHz ............................................................ OK
  54.   648 MHz ............................................................ OK
  55.   600 MHz ............................................................ OK
  56.   504 MHz ............................................................ OK
  57.   480 MHz ............................................................ OK
  58.   408 MHz SKIPPED
  59.   312 MHz SKIPPED
  60.   240 MHz SKIPPED
  61.   120 MHz SKIPPED
  62.    60 MHz SKIPPED

  63. Testing CPU 3
  64. 1536 MHz SKIPPED
  65. 1440 MHz SKIPPED
  66. 1344 MHz SKIPPED
  67. 1200 MHz ............................................................ OK
  68. 1104 MHz ............................................................ OK
  69. 1008 MHz ............................................................ OK
  70.   912 MHz ............................................................ OK
  71.   816 MHz ............................................................ OK
  72.   720 MHz ............................................................ OK
  73.   648 MHz ............................................................ OK
  74.   600 MHz ............................................................ OK
  75.   504 MHz ............................................................ OK
  76.   480 MHz ............................................................ OK
  77.   408 MHz SKIPPED
  78.   312 MHz SKIPPED
  79.   240 MHz SKIPPED
  80.   120 MHz SKIPPED
  81.    60 MHz SKIPPED

  82. Overall result : PASSED
Copy the Code


No heatsink used, ambient temperature at 23°C:




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