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    X728 Power Mgt + UPS Board Hardware   Software
     
 
   
         
   
         
     
         
 
    PRODUCT OVERVIEW 
     
 

The X728 is an advanced uninterruptible power supply expansion board for all current models of the Raspberry Pi using a 40 pin header. It provides

5.1V 8000mA Power Backup for even the most demanding Raspberry Pi set ups, intelligent and safe power management, safe shutdown，AC power loss/ power adapter failure detection , auto power-on, full poweroff from software, and a real- time clock. The X728 reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards for enhanced applications. The X728 can also be used with the x825/x828/x829 (2.5" HDD/SSD Shield) and x857/x862/x872 (MSATA/M.2 SSD shield) for safe data backup.

  
     
  SAFETY INSTRUCTIONS AND WARNINGS
     
 
· You must read these safety instructions and warnings before charging your batteries. 
· Lithium Polymer and Li-ion batteries are volatile. Failure to read and follow the below instructions may result in fire, personal injury and damage to property if charged or used improperly. 
· Never make wrong polarity connection when charging and discharging battery packs. Always double check polarity of battery's connector to make sure "+" to "+" and "-" to "-". 
· Do not mix and use old batteries and new batteries, or batteries with different brand names. 
· Lithium batteries has it's cycle life, please replace old battery with new one when it reaches it's service life or when it is two year old, whichever comes first. 
· When charging Battery Pack, please put battery in a fire proof container. Please don't leave the X728 on the wood material or carpet and unattended. 
· Must keep the X728 away from children. 
 
     
    PRODUCT FEATURES
     
FOR USE WITH
- Raspberry Pi 1 Model B+/ 2 Model B / 3 Model B / 3 Model B+ / 3 Model A+ / 4 Model B
OPERATING SYSTEM
- Raspbian Stretch
- Safe shutdown function tested for Raspbian, other operating systems to be tested and advised
   

KEY FEATURES
   
  X728 18650 UPS + Power management board
- Smart and powerful Uninterruptible Power Supply (UPS)
- Provides continuous operations for up to 10~30hours (depending on battery type and qty used)
- Max 5.1V 8000mA Power Backup for even the most demanding RPi set ups
- 18650 two cells lithium Ion holder
- Can work with X728-A2 stackable 2-cell battery holder to increase battery capacity
- Supports 3000mA fast battery charging
- Integrated battery protection circuit
- Integrated over current protection and over voltage protection
- Integrated Maxim's fuel-gauge systems (Reading battery voltage and percentage via i2c)
  Integrated 10-A fully-integrated synchronous boost converter
- Intelligent automatic charging and discharging
- On-board 4 green LEDs indicate battery charging and discharging levels of 25%, 50% , 75% and 100%
 
  Intelligent and safe power management
- Equipped with momentary button for easy power control
- Press the button to turn on
- Press the button and hold for 1~2seconds to reboot
- Press the button and hold for 3~7seconds to implement safe shutdown
- Press the button and hold for >8seconds to force shutdown
- Supports safe shutdown and full poweroff through software
- On-board blue LED shows the status of power on, reboot and shutdown
- AC power loss or power adapter failure detection (LED and GPIO detection)
- Optional to enable Auto power on when power applied or restored
- Automatic safe shutdown when battery low (voltage <3.0V)
- Ultra-low standby power consumption to maximize battery life
- Operate in both charge mode and boost mode to allow full system management and battery power management
- Integrated IN-to-SYS pass-through path to pass the input voltage to the system
- Advanced system power-path management avoids batteries frequent charging and discharging
- Advanced system power-path management allows 3A fast charging and powering Raspberry Pi at the same time
   
  Integrated Hardware Real Time Clock (RTC) with Battery Back-Up
- Keeps track of the time while the Raspberry Pi is switched off
- Allows the Raspberry Pi to retrieve the current date and time when it is switched back on
- Uses the most common DS1307 RTC real time clock
- Uses the 18650 battery to maintain the date and time - no additional battery required
   
  Misc
- Powers the Raspberry Pi via the 40-pin header - no additional cabling required
- On-board DC power jack (5.5*2.5mm) and Type-C socket convenient for power input
- On-board PH2.0 connector allows to connect external power switch and DIY your perfect case
- On-board XH2.54 power output connector allows to power other devices
- Reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards
- Mounting holes and standoffs provide mechanical stability of the Raspberry Pi and X728 assembly
   
  X728-A1 Optional Raspberry Pi cooling fan
- Completely solve the overheating problem of your Raspberry Pi
- Efficient drop temp of your Raspberry Pi by using the X728-A1
- Stackable design allows you to connect both X728 and X728-A1on your Raspberry Pi
- On-board XH2.54 power output connectors allow to power other devices
- Reserves the 40-pin header that can be stacked with other Raspberry Pi accessory boards
   
X708-A1 Optional 18650 8-Cell battery holder
- Stackable 18650 8 cells lithium Ion holder
- Ideal solution to increase battery capacity
- Integrated battery protection circuit
- Mounting holes and standoffs provide mechanical stability of the Raspberry Pi, X728 and X708-A1 assembly
   
X728-A2 Optional 18650 2-Cell battery holder
- Stackable 18650 2 cells lithium Ion holder
- Ideal solution to increase battery capacity
- Integrated battery protection circuit
- Mounting holes and standoffs provide mechanical stability of the Raspberry Pi, X728 and X728-A2 assembly
   
SPECIFICATION
   
- Power supply via Type-C socket : 5Vdc ±5%, ≥3A
                              Via DC power jack : 5Vdc ±5%, ≥4A
- UPS output : 5.1V ±5% Max 8A
- UPS charging current: 2.3~3.2A
-

Terminal Battery Voltage : 4.24V
-

Recharge Threshold : 4.1V
   
NOTES
   
- Do not apply power to your Raspberry Pi via the Micro USB socket or Type-C socket.
- Do not use 18650 battery with built-in protection circuit
   
     
    Box Contents
 
  X728    
- UPS expansion Board x 1  
- Screw M2.5 *5mm x 8  
- Hex brass spacer M/F M2.5 *20mm x 4  
- Hex brass spacer F/F M2.5 *20mm x 4  
- Jumper link Pitch 2.54mm  x 2  
 
     
 
  X728-A1    
- Coiling fan expansion Board x 1  
- Hex brass spacer M/F M2.5 *21mm x 4  
- Hex brass spacer F/F M2.5 *12mm x 4  
 
     
 
  X728-A2    
- 2-cell battery holder board x 1  
- Hex brass spacer M/F M2.5 *23mm x 4  
- XH2.54-2P power cable x 1  
 
     
 
  X708-A1    
- 8-cell battery holder board x 1  
- Screw M2.5 *5mm x 4  
- Spacer M/F M2.5 *23mm x 4  
- Spacer M/F M2.5 *22mm x 2  
- Spacer F/F M2.5 *22mm x 2  
 
     
    Optional Accessories
     
 
     
  Power Supply Unit  
- AC 100 - 240V input  
- 5Vdc 4A output
- W/ EU and US plug
- 5.5*2.5 DC plug
- 1.2M cable w/ magnet ring
  See details  
     
 
     
 
       
 
     
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