Tantalum

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  1. Tantalum

    Announcement : Odroid N2

    Well, the basic physics also allows you to flip the board by 180° like this: https://reho.st/self/dbe8a2f2236732bc929bedb89fd627a5bf0d2bac.jpg I also replaced the original thermal sheet, by a 1.5mm copper sheett + thermal grease. 40min to reach 80° at full load. Never smelled burned. https://reho.st/self/028b5abe980510d83950ceb82cf36153e44f91d3.png The reason is simple, the Amlogic S922 doesn't support PCIe: About the N2, the SoC seems to be very interesting, the lack of PCIe is indeed disturbing, but except for storage, there is no really need for it, USB 3 can do the job. Personally I never liked the board design of the N- series. The boards are too big, they are huge, they are as big as an Intel NUC. Do you think that FriendlyArm may release a board using the same SoC in the near future? Because I like the compact format of their M4 and Neo's.
  2. Tantalum

    NanoPI M4

    IDLE : VDD_5V : 5.05V VCC5V0_SYS : 5.03V FULL: VDD_5V : 4.85V VCC5V0_SYS : 4.80V Powered with a Meanwell GS25E-05, 16AWG wires (12.5mOhm/m). The VDD_5V goes through the AO3415A mosfet. According to the specs it has a 42mOhm Rds(on). That mean a loss of 0.02V@idle and 0.1V@load. I haven't measured the USB 5V voltage, but it's directly connected to VDD_5V over a RT9724GQW load switch I think (Rds(on): 100mOhm),
  3. Tantalum

    NanoPI M4

    Consumption test: (Wifi off. With Gigabit LAN connection) Idle: 2.30W 1-Core: 4.40W 2-Core: 6.70W 4-Core: 7.75W 6-Core: 8.85W 6-Core + IO : 9.50W Idle: Full+IO:
  4. Tantalum

    NanoPI M4

    https://www.aliexpress.com/item/DC-Power-Adapter-Converter-Type-C-USB-Male-to-5-5x2-1mm-Female-Jack-Connector-for/32830289064.html
  5. Tantalum

    NanoPI M4

    mmh I think there are some major misunderstanding here about the USB-C power supply. 1. The problem about the under voltage at the input of the board are the thin wires of the USB cable... Solution? Do not use USB cable to power the M4 board, just use a descent barrel Jack DC power supply (for example: Meanwell) 2. Do we have to power the board over the pin header? No, not necessary. The USB-C connector is rated for 5A, physically! Not 3A. The 3A limitation is a question of wiring limitation of the standard USB-C cable, not the connector itself (and hypothetically the PCB traces of the board) The missing support for USB-PD isn't an issue either. Don't use USB-C power supplies, it's that simple as that. Again, just use a descent barrel Jack DC power supply! And if possible a 5.1V or 5.2V one. You only need a cheap USB-C DC jack adapter (which causes also probably a weak voltage drop): https://www.ebay.com/itm/DC-5-5mm-x-2-1mm-Female-To-USB-3-1-Type-C-Male-Right-Angle-Power-Supply-Adapter/302779342823 Now, about the USB 3.0 connectors. Well indeed, at load there is a voltage drop on the board, especially on heavy load, and they are partially caused by the mosfets on the power rail on the board I think. edit: VDD_5V goes through the AO3415A mosfet to power the board. It has a 42mOhm Rds(on). which caused alone a 0.1V drop at full load of the M4 board (2A). The USB 3.0 port uses a RT9724GQW load switch which has a Rds(on) of 100mOhm. That causes another 0.1V loss at 1A load.
  6. Tantalum

    NanoPI M4

    Hello Can someone explain me the purpose of the PWR_KEY on the M4/NEO board please? Even after checking the schema and the PMIC datasheet I still don't fully understand how it works exactly. Does it act as an reset? Or does it act like a regular power button on a PC, in other words, it tells the OS to properly shutdown, to avoid data corruption. Thank you
  7. Tantalum

    NanoPi NEO4

    Hello Any idea when the NEO4 will be available for sale?
  8. Tantalum

    NanoPi NEO4

    Those Ram chips have a 16bit bus each, not 32bit. https://www.samsung.com/semiconductor/global.semi/file/resource/2017/11/DS_K4B4G1646E_BY_M_Rev1_11-0.pdf I hope they will design a 2GB Neo 4 version , 1GB Ram is clearly not enough for such a SoC