X728-hardware

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X728 V1.3

X728-V1.3-Interface

X728 V1.2

X728-IMG-7960-1.jpg

X728-IMG-7979-1.jpg

Power Jack and Connectors

  1. X728 powers the Raspberry Pi via the 40-pin header (Pin 2 & 4)
  2. Don't power the Raspberry Pi via the Pi's type-C USB socket
  3. X728 can be powered via the onboard DC jack or Type-C USB power socket

6-Pin Function Header for X728 V1.2

Connector for External Power Switch

  1. Please use momentary switch only and don't use latching switch
  2. Connector - Pitch 2.0mm 4pos

Power button (Script for power mgnt installed)

Function LEDs

Fuel gauge - LED Indicator

Operation of Discharging:

Operation of charging:

Pins and GPIO used

18650 battery dimension

18650size.png Do not use 18650 battery with built-in protection circuit

Installation Guide

X728

Return to X728

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Anonymous user #14

one month ago
Score 0++
X728 V1.3 removes the ASD function, so instead of a six-pin function header, there is a four-pin function header. AON is the same as described here. The other pair of pins is labeled VIN rather than PLD -- are the VIN and PLD functions the same, or does VIN do something else?

Anonymous user #15

one month ago
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Looks like Voltage In ( + and - signs on either side), so PLD is gone too?

Anonymous user #16

4 days ago
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PLD and ASD are both automatic now.

Anonymous user #13

one month ago
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can this be used with the Freenove Smart car shield for Raspberry Pi?

Anonymous user #12

2 months ago
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This command does not work.

sudo apt-get install python-smbus Reading package lists... Done Building dependency tree Reading state information... Done Package python-smbus is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source

E: Package 'python-smbus' has no installation candidate

How do I get the Python scripts like x728bat.py?

Thanks,

Bob

Anonymous user #11

2 months ago
Score 0++
Can i power it from a solar panel via DC 5525 Jack in, to act like a solar charger ?

Anonymous user #5

4 months ago
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Hi, I have the 728 for some time now and it is a great board. Now I want to connect an extension to the 40 pin GPIO pins on top, but there is no print on the component side of the unit. So, looking from above, which prin is pin 1?

Cindy

4 months ago
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Hi friend,

The pin out is the same with Raspberry Pi 4, please refer to raspberry PI 4 PIN OUT,thanks!

Anonymous user #10

4 months ago
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What is the DC jack? is the pin + or -?

Xiali

4 months ago
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Hi dear ,the DC jack is a port to power in,By the way ,There are many Raspberry Pi fans exchange experiences on our official website, you are welcome to join us https://geek...munity/forum

Anonymous user #9

5 months ago
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RPi 3B+: The X728 appears to be operating properly, including providing 5V to Pins 2 and 4. But when I plug the X728 into my RPi 3B+, the 5V pins immediately drop to 3.2V and the Pi will not boot.

Any suggestions?

Anonymous user #8

5 months ago
Score 0++
Although not advertised as compatible, the X728 is working fine when plugged directly into my RPi Zero W. However, I found that if I use a cable and make only the connections specified between the X728 and Pi (Pins 2-6, 29, 31-33) the i2C stops working, so that the clock and battery status functions won't work. After some experimentation I found that connecting pin 1 in addition to the documented pins restores the i2c functions. I'm guessing the X728 is getting the 3.3V voltage level used for the i2c from the Pi. I assume this may be the case for all Pi models. If I'm right, you should add pin 1 to the list of "Pins and GPIO used."

Xiali

5 months ago
Score 0++

Hi dear,tks for your effort , 1. AC POWER LOSS has GPIO detection, it can be shut down after detection; 2. Pls plug in the shorting cap to get the AUTO-ON function, 3. If you'd like to send a signal to tell the UPS only provide backup power for x amount of seconds ,pls develop your own script to get the functions.

4.By the way ,There are many Raspberry Pi fans exchange experiences on our official website, you are welcome to join us https://geek...munity/forum

Anonymous user #6

8 months ago
Score 0++

Clarify please feature "Auto-On". Here is scenario: 1. Software detect AC-power loss. 2. Software gracefully shutdown RPi (battery still charged!). 3. AC-reapplied.

Will be RPi turned automatically on?

Anonymous user #7

6 months ago
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Has this been confirmed or any feedback?

Xiali

6 months ago
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Your question seems to be contradictory. . . .

Anonymous user #7

5 months ago
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The scenario is this. Basically you want to use the UPS as a means of graceful software shutdown.

1. On AC Power Loss -> graceful software shutdown 2. On AC Power Gain -> boot raspberry Pi

I cant seem to find a configuration that will allow you to use the UPS in this way.

Anonymous user #7

5 months ago
Score 0++
Is there a way you could send a signal to tell the UPS only provide backup power for x amount of seconds? This would allow for an AC power controlled graceful shutdown and boot.

Anonymous user #5

9 months ago
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Can I power the X825 board as well as the RPi4B from the X728? How do I connect it?

Cindy

9 months ago
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Hello sir,

When use the X728 with X825 board, please power from X725, do not power from X825 or Raspberry Pi 4.

Anonymous user #5

10 months ago
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One more question: why can't I use protected 18650 batteries? They are more safe, aren't they?

Anonymous user #5

10 months ago
Score 0++
I bought the X825/X735 set with case and power supply a short time ago and now want to replace the X735 by the X728. Is this possible? It will not fit in the case anymore though and the cooling fan will be gone, so what is the best solution to avoid overheating?

Anonymous user #4

10 months ago
Score 0++
How could one write a script to trigger the x728off code to run in the event of a Power Loss Detection

Anonymous user #1

11 months ago
Score 0++
Which jumpers are which?

Anonymous user #2

11 months ago
Score 0++

Pin assignments for the jumpers are printed on the underside of the board at least! :

From the Power jack end : AON (Auto On) PLD (Power loss detection) ASD (Auto shutdown)

to nearest the USB-C Connector

Anonymous user #3

11 months ago
Score 0++

No, correction, it reads thus :

From the Power jack end : PLD (Power loss detection)

AON (Auto On) is the middle pair.

ASD (Auto shutdown)

is nearest the USB-C Connector.