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X728 ups board-Front
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X728 ups board
X728-A1 Packing List
X728-A2 Packing List
X728 PCB Layout


Contents

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.
  • Please watch Main Video and Tutorial Video regarding 18650 batteries at: https://www.staysafebattery.com/en/

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
  • Can work with X728-A2 stackable 2-cell battery holder to increase battery capacity
  • Supports 3000mA fast battery charging
  • 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)
  • On-board pin header allows to select auto power-on when power supplied
  • 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 DS1307 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 18650 battery to maintain the date and time - no additional battery required


  • 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

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

Note:

  • 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

Packing List

  • X728 Expansion Board x 1
  • Screw M2.5 *5mm x 8
  • Spacer M/F M2.5 *20mm x 4
  • Spacer F/F M2.5 *20mm x 4
  • Jumper link Pitch 2.54mm x 3

X728-A1

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
  • X728-A1 supports X750/X758 also.

X728-A2

X728-A2 Optional 18650 2-Cell battery holder

  • Stackable 18650 two cells lithium Ion holder
  • Ideal solution to increase battery capacity
  • Integrated battery protection circuit

User manual

FAQ

Q: Why X728 automatically shuts down?

A: 1. X728 will automatic safe shutdown when battery voltage is low than 3.0V, please charge in time;

2. Please try the following operation by step:

  1. Remove all jumper cap,
  2. Remove all 18650 battery
  3. Place 18650 battery again and wait a few seconds before testing
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Anonymous user #3

6 days ago
Score 0  

Why does the Raspberry Pi turn on and off repeatedly? The power turns on and turns off after 3 seconds, and turns on again. Is it because the battery is not fully charged?

X750 had the same error...
 

JesseArmand

14 days ago
Score 0  

I'm running https://raspap.com/ to use the Pi as a wireless hotspot. There was an issue with bringing up the wireless interface on RaspberryPi 3B+, if I short the jumper pin for ASD (Auto Shutdown). If I don't short the jumper, it becomes normal.

Has anyone else encountered the same issue?
 

Anonymous user #2

2 months ago
Score 0  

Cindy,

When do you expect the X728-A1 and X728-A2 boards to be available?

Is there a X728 Case in the pipeline?
 

Cindy

2 months ago
Score 0  

Hi friend,

The X728-A1 and X728-A2 will release later in May.
 

Anonymous user #1

2 months ago
Score 0  
When will this item be released?
 

Cindy

2 months ago
Score 0  

Hi friend, The X728 has just been releasded today, please refer to: https://geek...gement-board Best regards,

Cindy/Geekworm