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Adds battery charging control via GPIO16
<pre>
"CHG Ctrl" - Short : battery automatic charging when powe adapter connected
"CHG Ctrl" - Open : GPIO16 output stays high - Charging enabled, GPIO16 output stays low - Charging disabled,
echo "16" > /sys/class/gpio/exportecho "out" > /sys/class/gpio/gpio16/directionAdds 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.
Enable charging
echo "1" > /sys/class/gpio/gpio16/value
Disable charging
echo "0" > /sys/class/gpio/gpio16/value
</pre>
* Added power input connector, which can be used with X715 to achieve 6~60V wide voltage input.
==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
==User manual==
* [[x728-Software]]: This script is required to install to enable safe shutdown function.
* [[x728-hardware]]: Provides some hardware parameter information.
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]]
{{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;
===X728 V2.3===
Released on 20th Aug. 2022;
* User guide refer to [[X728-Software]]
===X728 V2.0(sold out)===
* 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(sold out)===
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==
* 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==
* Ideal solution to increase battery capacity
* Integrated battery protection circuit
==X728 Extended Application==