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bigtreetech / BIGTREETECH-SKR-V1.3

32bit board with LPC1768, support marlin2.0 and smoothieware, support lcd2004/12864, On-board TMC2130 SPI interface and TMC2208 UART interface no additional wiring is required
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SKR 1.4 Documentation: Missing NPWR jumper description in the manual #200

Open stantond opened 4 years ago

stantond commented 4 years ago

As titled. Please add what this jumper does to the manual.

csaintdenis commented 4 years ago

yes, please do!

SusiBiker commented 4 years ago

Another +1

Creality1968 commented 4 years ago

Another +2..

zLows commented 4 years ago

C'mon, npwr - neopixel/bl/etc power source selector (for dc-dc bridge owners). More clearely in pinout manual here

stantond commented 4 years ago

Still unclear on what it does. I have the DCDC module and bltouch. Which pins should this jumper be on?

zLows commented 4 years ago

DCDC bridge converts 12/24 from VIN to 5 at VOT that means VOT+NPWR should be jumpered.

stantond commented 4 years ago

Do you know how that differs from not using the bridge and leaving it on +5v?

zLows commented 4 years ago

Oh, man... try to google something 'bout electronic schematics or so. :( But your dcdc bridge useless 'till npwr jumpered with 5v.

upd: briefly, it lowers the voltage almost directly, as if separate power supply were used (4 npwr powered additions). in pros - minimum power fluctuations (board not affected), in cons - it's still limited by plugged power supply.

upd2: strange that U didn't think bout it be4 buying. %)

stantond commented 4 years ago

I understand that the DCDC bridge is a step-down converter configured to provide a continuous 3A at 5v, but I don't know what the point of it is on this board. I've seen others on YouTube using a BL Touch and a display, with the DCDC module, but with this jumper unchanged (not set as you've suggested). I assume that the board itself can handle these deices easily, but it would not handle supplying consistent current to multiple 5v lighting devices as well, whereas the DCDC bridge does enable this, but I don't want to assume, I want to know, and I expected the function, limitations, and jumper settings to be described in the documentation (or at least the product listing for the module on Ali!), which is not unreasonable.

I bought it because the difference between the cost of the board standalone vs the board with several optional modules was negligible, so like anyone with a bit of foresight when buying electronics from China, I ordered them together, so I wouldn't discover I needed a module later and have to wait another month for it to arrive before I can resume printing.

For reference, the datasheet of the main component in the DCDC bridge is here.

Clyde78 commented 4 years ago

From my understanding, the DCDC bridge is a buck converter that provides 5V for the TFT, BLTouch and Neopixel headers. The SKR 1.4 got its own onboard 5V converter, but it's shared with whatever else on the board needs 5V, so if you plan on running a lot of neopixels or other 'heavy' 5V loads, getting the DCDC bridge is adviced. With that module plugged in, you can draw up to 3A on the 5V rail. I'd recommend staying beneath that top load however. 2.0-2.5A should be fine. The manual advices to run less than 30 neopixel LEDs, which is plenty.
The NPWR jumper selects the 5V source for the TFT, BLTouch and Neopixels. With the jumper in its default position (bottom and middle pin) the onboard 5V regulator is used. If you got the DCDC bridge, move the jumper to the top and middle pin to actually USE the bridge too.

sl1pkn07 commented 4 years ago

https://github.com/bigtreetech/BIGTREETECH-SKR-mini-E3/blob/master/hardware/BTT%20SKR%20MINI%20E3%20V1.2/The%20Notement%20of%20BTT%20SKR%20MINI%20E3%20V1.2.pdf

avidNewb commented 4 years ago

I appreciate those of you who answered this question reasonably and without criticism. Your answers were just what I needed. As someone who creates documentation daily, it is fair to say the documentation for these boards and parts is lacking. Any abbreviations, jumpers, and pins should be clearly defined.

wrych commented 3 years ago

For those like me searching for this 6 months later: https://github.com/bigtreetech/BIGTREETECH-SKR-V1.3/blob/master/BTT%20SKR%20V1.4/Hardware/SKR-V1.4-Turbo-pinout.jpg

thebeline commented 2 years ago

Not to revive a dead topic, but another consideration:

When using a Raspberry Pi, it is advisable to only connect GND/Tx/Rx and leave 5v unbonded (as it can cause issues with the onboard 5v regulator (or separate regulator). That said, you could remove the NPWR jumper entirely, and bond the 5v from the Pi to the NPWR pin on the TFT connector. This would cause NPWR to be provided 5v from whatever the Pi was receiving 5v from (it is a direct passthrough).

For those of us without the external buck converter, but a high-power supply for the Pi, this is a very useful trick.

yasaslive commented 2 years ago

Can we close this issue?

Zfrenchy commented 7 months ago

NPWR