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[[File:X728-V2.0-IMG-0449-接口示意EN.jpg|thumb|right|X728 V2.0 Interface]]
released Released on 23th Sep. 2021;
* Added power input connector, which can be used with X715 to achieve 6~60V wide voltage input.
* <span style="color:red;">'''Important：X728 V2.0 changes the direction of the battery polarity. When installing the battery, you must check and confirm the positive and negative poles.
==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 6000mA 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.
Video Test Max 5.1V 6000mA Output: https://youtu.be/m_oIDrMEp0U
==X728 extended application==
X728
,[[File:IMG-0449-interface-EN.jpg|thumb|right|X728 V2.5 Interface]]
[[File:X728-V2.3-Interface-EN.jpg|thumb|right|X728 V2.3 Interface]]
[[File:X728-V2.0-IMG-0449-接口示意EN.jpg|thumb|right|X728 V2.2 Interface]]
[[File:X728-V2.1-interface-EN.jpg|thumb|right|X728 V2.1 Interface]]
[[File:X728-V2.1-Jumper cap function.jpg|thumb|right|X728 V2.1 Jumper Cap Function]]
[[File:X728-V2.1-packing-list.jpg|thumb|right|X728 V2.1 packing list]]
[[File:X728-V2.0-IMG-0445-Jumper.jpg|thumb|right|X728 V2.0 Jumper cap function]]
[[File:IMG 9490-Interface.jpg|thumb|right|X728 ups board-Interface]]
{{GD Template Impl}}
==Overview==
'''[NOTE]''': X728 supports also Raspberry Pi 5 hardware, the installation script is updated. Refer to [[X728-script]]
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 6000mA 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, battery capacity reading, and a real- time clock(RTC), buzzer alarm.
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.
Video Test Max 5.1V 6000mA Output: https://youtu.be/m_oIDrMEp0U
<span style="color:red;"> Note: X708, X703 UPS '''does not support''' Raspberry Pi 5.
==Update History==
===X728 V2.5===
Released on 27th July. 2023;
Adds battery charging control via GPIO16, and this function is only suitable for advanced players, please refer to [[X728-script#How to Use GPIO16 to control battery charging|How to Use GPIO16 to control battery charging]] for specific usage.
===X728 V2.3===
Released on 20th Aug. 2022;
No any functional changes; just change the SMD 18650 battery holder to a pin battery holder to improve the reliability of battery holer soldering.
<span style="color:red;">'''WARNING!!!'''
* <span style="color:red;">'''Please be sure to install the X728 and Raspberry Pi in the correct order. The copper pillars must be fixed before installing the x728. Avoid short circuit caused by the X728 board touching the USB connector of the motherboard, which may cause the chip to be burned.
* <span style="color:red;">'''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 "-". '''
Installation Video:https://youtu.be/q_TmqMNhJPM
===X728 V2.2===
Adds Battery Reverse Polarity Protection circuit & LED indiciators on v2.2
===X728 V2.1===
Update:
* User guide refer to [[X728-Software]]
===X728 V2.0(discontinued)===
* PIN33 (GPIO13) is replaced by the PIN37 (GPIO26) to avoid the I2S interface from v1.3 to v2.0.
* Improve the power path function, the battery will only charge and not discharge when connected to the PSU(power supply unit). [The PSU power will charge the battery and also pass through to the RPi when it has power. If the PSU loses power (power failure), the X728 will switch over to battery power.]
* You can choose to charge when boot up by short "CHG EN" and stop charging at shutdown.
* Increase battery overcharge, overdischarge protection circuit, added power input surge protection circuit.
* PCB Size change: 87x63.7mm
'''
===X728 V1.3(discontinued)===
X728 V1.3 is released at Febuary 2021.
* Remove the hardware ASD function and change it to software implementation
* The charging power indicator (LED1-LED4) is relatively brighter than V1.2.
==SAFETY INSTRUCTIONS AND WARNINGS==
===PCB Size===
* X728 V2.0/V2.1/V2.2: 87x63.5mm
* X728 V1.3: 85x63.5mm
==How to Power==
* Power via DC5521 Jack of X728, 5.1Vdc +/-5% , ≥4A (DC5525 Jack is compatible with DC5521, also support 5V PSU with DC5525 Jack)
* Power via USB Type-C port of X728, 5.1Vdc +/-5% , ≥3A (Geekworm Type-C 5V 4A 20W power supply is recommended.）
==Packing List==
* Spacer F/F M2.5 *20mm x 4
* Jumper link Pitch 2.54mm x 3
==User manual==
* [[x728-Software]]: This script is required to install to enable safe shutdown function.
* [[x728-hardware]]: Provides some hardware parameter information.
==X728-C1==
X728-C1 is a metal case for X728 V2.3/V2.2/V2.1/V2.0 or X708/X735.
Installation Video: https://youtu.be/QOG30LXb6ds
* Integrated battery protection circuit
==User manualX728 Extended Application==* [[x728-Software]]* [[x728-hardware]]
[[File:How-to-Connect-Raspi-and-X728-IMG-8330-970X600.jpg|970px|How to Connect Raspi and X728]]
[[File:X728+X708-A1.jpg|970px|X728 with X708-A1]]
[[File:IMG-5934-1.jpg|970px|X825 + X728 + X708-A1 + X728 A2]]
[[File:X825-x728-IMG-5941-1.jpg|970px]]
==FAQ==
A: It depends on the motherboard and OS, please refer to this topic as reference: https://forums.raspberrypi.com/viewtopic.php?p=312582
Q12: What the maximum current rating of X728-A1 is?
A: The maximum current rating of X728-A1 is 90MA.
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