Power bank & UPS - XUPS2
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       hardware introduction  
 
 
MX3.0-2x5P power input & UPS output socket
 

  • Pin1,3, 5, 7, 9: Ground
 

  • Pin2: Power input 12-28V (For inputs >20V, Verify that your battery supports a maximum charge current of 5A and set the P3 header jumper to "140".)

 
  • Pin4, 6: 12V UPS output
 
  • Pin8, 10: 5V UPS output
   

Warning: To avoid damage, ensure no cable is connected to the USB-C port when using the MX 3.0 socket for power input.

P3 Configuring charge current and discharge power (USB-C & MX3.0-2x5P socket)
   
USB-C Power input / output
Charge and discharge current (A)
Label 30W PD
Charger
VBUS=20V		 45W PD
Charger
VBUS=20V		 65W PD
Charger
VBUS=20V		 100W PD
Charger
VBUS=20V		 140W PD
 Charger
VBUS=28V
30 1.5  1.5  1.5 1.5 1.5
45 /  2.25  2.25 2.25 2.25
65 /  /  3.25 3.25 3.25
100 / / / 4.7 4.7
140 /  /  /  / 5.0


- Set charging current via the labeled jumper (Default: 1.5A).

- The charging current may be lower, depending on the system load. 

- For normal use: Set to the lowest  charging current to ensure system power is

  supplied by the charger.

- ⚠ Important: Always confirm your battery's max. charge current before setting. 
14-pin interface header
   

  • I2C SDA, SCL: I²C Power Monitor for charging & UPS output (voltage/current).

 

  • CHG Control: Control battery charging, High(3.3V) -charging disabled, Low (0V) -charging enabled 

 

  • VDET : Short-circuit to 3.3V(Pin 6) to keep the UPS output permanently enabled. Alternatively, connect to the SBC's 3.3V power rail to allow the UPS to automatically cut off its output after the SBC shuts down.

Note: If the VDET pin is left floating, the UPS output will turn on for 3 seconds and then shut off.

  • UPS12V AON: Short to 3.3V(Pin4) to enable automatic power-on when input power is applied or restored. If left floating, the 12V output must be turned on manually by pressing the 12V button.

 

  • UPS5V AON: Short to 3.3V(Pin4) to enable automatic power-on when input power is applied or restored. If left floating, the 12V output must be turned on manually by pressing the 12V button.

 

  • 3.3V: This rail is always present and is not controlled by the system. It can be used for jumper settings or to provide up to 80mA of current to power external devices.

 

  • AC PLD: AC power loss & power adapter failture detection, Low (0V) -power supply failed, High (3.3V) -power supply OK

 
  • 5V OUT: 5V UPS output
 
       required hardware  
 
   1   

XUPS2 UPS & power bank board

    2   

21700 4.2V rechargeable lithium-ion battery  x4

  
  3   USB-C PD charger (65W,100W, 140W recommended)   4   Optional XUPS2-A1 4x21700 serial stackble battery holder  
     
 

* Reference for Selecting USB-C PD Chargers (Default Charging Current: 1.5A).

- 65W PD charger (Output 20V 3.25A) for system loead ≤40W

- 100W PD charger (Output 20V 5A) for system loead ≤75W

- 140W PD charger (Output 28V 5A) for system loead ≤115W

 

  For first use, connect a USB-C PD charger to activate the UPS.

 
 
       hardware connection  
 
 
Cable Connection Diagram shows how to connect the UPS board to the peripheral devices
For I²C and UPS control on Raspberry Pi and compatible SBCs.
 
 
 
"TO UPS"  Accessory Board - 10-pin female header











Note: The accessory board plugs into pins 5-14 of the 14-pin interface header on the XUPS2 main board. Pins 1-4 are not populated.
 
 
 
"TO SBC"  Accessory Board - 12-pin female header
 
   
9-pin XH2.54 connector pinout 
 

  • Pin1, Pin2: 5V UPS output
 
  • Pin3, Pin4: Ground                                                                
 
  • Pin5: VDET
 
  • Pin6: AC PLD
 
  • Pin7: CHG Control
 
  • Pin8: I2C SCL
 
  • Pin9: I2C SDA
 
 
       hardware installation  
 
 
Install the XUPS2-A1 stackable battery holder
Step 1
   
 

  • Insert the M2.5×5mm screw upward through the base mounting hole, then thread the M2.5×14mm female-female spacer onto the screw until finger-tight. 
   
Step 2
 

  • Plugs the UPS board directly into the 14-pin battery header.

 

  • Secure the XUPS2-A1 to the spacers with four M2.5x5mm screws.

   
   
   
   
Step 3
   

  • Compatible with unprotected 21700 batteries only (Max. length: 70.3 mm).

 

  • Double-check the polarity of the battery's connector to ensure that "+" is connected to "+" and "-" is connected to "-".

 
  • Polarity also printed on the PCB* - Never make a wrong polarity connection.
Step 4
 

  • WARNING: Before applying power, you must verify the polarity of every battery and confirm they are all seated properly. Reverse polarity can cause permanent damage.

 

  • For first use, connect a USB-C PD charger to activate the UPS.

 
   
   
 
 
   
   
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