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==X728 V1.3 is released==
X728 V1.3 is released at Febuary 2021.
* V1.3 <span style="color:red;">removes</span> the ASD harware function and adds power surge protection function, but we '''new add''' the software shutdown python script when battery is low voltage, please rerfer to [[X728-Software]]
* The charging power indicator (LED1-LED4) is relatively brighter than V1.2.
Q2: We want automatic shutdown when the external AC power supply is disconnected, is possible?
A： Yes. you can program a script to get this function. Example (The following is a pseudo code):
<pre>
while (1) {
// invoke the API to get AC PSU status: connected or disconnected
int disconnected_flag = getACPSUStatus(); // please refer to the user manual to achieve getACPSUStatus function;
int battery_voltage = getBatteryVoltage(); // please refer to the user manual to achieve getBatteryVoltagefunction;
// You can make your own actions based on disconnected_flag and battery_voltage, you can only select one condition also
if (disconnected_flag) {
// execute linux or software shutdown command
}
sleep(10);
}
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-04470449-SHOW接口示意EN.jpg|thumb|right|X728 V2.0 ups board2 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-Frontlist.jpg|thumb|right|X728 V2.1 packing list]][[File:X728-V2.0-IMG-79560445-Jumper.jpg|thumb|right|X728 ups board-FrontV2.0 Jumper cap function]]
[[File:IMG 9490-Interface.jpg|thumb|right|X728 ups board-Interface]]
[[File:X728-IMG-7976-跳线说明.jpg|thumb|right|X728 V1.3 ups board-Jumper cap function]]
[[File:X728-IMG-7975.jpg|thumb|right|X728 ups board]]
[[File:X728-IMG-7957.jpg|thumb|right|X728 v1.2 ups board-Back]]
[[File:X728-A1-IMG-8199-Packing-List.jpg|thumb|right|X728-A1 Packing List]]
[[File:X728-A2-IMG-8211-Packing-List.jpg|thumb|right|X728-A2 Packing List]]
[[File:X72801-IMG-3946-PCBmain.pngjpg|thumb|right|X728 PCB Layout-C1 metal case for X728 V2.x/x735/x708]][[File:X728+X728IMG-A1+X7283916-A2acce.jpg|thumb|right|X728+X728-A1+X728x728-A2c1 Accessories]][[File:X728+X728-A1+PCB.png|thumb|right|X728-A2-1V1.3 PCB Layout]][[File:X728_V2.0_PCB_Layout.jpg|thumb|right|X728+V2.0 PCB Layout]][[File:X728-A1+V2.1-PCB.png|thumb|right|X728-A2V2.1 PCB Layout]]
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==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 8000mA 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===
Released on 23th Sep. 2021;
Update:
* New add a buzzer controled by GPIO20
* DC jack is changed from DC5525 to DC5521.
* User guide refer to [[X728-Software]]
===X728 V2.0===
* 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===
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==
* <span style="color:red;">Must keep the X728 away from children.
*Please watch Main Video and Tutorial Video regarding 18650 batteries at: https://www.staysafebattery.com/en/
* Battery Recommend for X728 board, please refer to: [[File:NCR18650B.pdf|X728 battery recommend]]
==Features==
* 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 6000mA Power Backup for even the most demanding RPi set ups
* Can work with [[X728#X728-A2|X728-A2]] stackable 2-cell battery holder to increase battery capacity
* Supports 3000mA fast battery charging
===SPECIFICATION===
* Power supply via Type-C socket : 5Vdc ±5%, ≥3A, Via DC power jack : 5Vdc ±5%, ≥4A
* UPS output : 5.1V ±5% Max 8A6A
* UPS charging current: 2.3~3.2A
* Terminal Battery Voltage : 4.24V
* <span style="color:red;font-weight:bold">Do not apply power to your Raspberry Pi via the Micro USB socket or Type-C socket.
* <span style="color:red;font-weight:bold">Do not use 18650 battery with built-in protection circuit
===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==
* 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 <gallery>01-IMG-3946-main.jpg|for X728 V2.x/x735/x70802-IMG-3892-开关卖点.jpg|with metal switch03-IMG-3894-散热.jpg|active cool04-IMG-3907-场景图.jpg|application06-IMG-3941-size.jpg|dimensionIMG-3916-acce.jpg|x728-c1 AccessoriesIMG-3945-GPIO排线.jpg|with GPIO hole</gallery> ==X728-A1==
<span style="color:red;font-weight:bold">X728-A1 Optional Raspberry Pi cooling fan</span>
* 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 A1 on 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
* Integrated battery protection circuit
==User manualX728 Extended Application==* [[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]] [[x728File:IMG-5934-1.jpg|970px|X825 + X728 + X708-SoftwareA1 + X728 A2]]* [[File:X825-x728-hardwareIMG-5941-1.jpg|970px]]
==FAQ==
3. What battery is recommended for X728?
A:Because there are so many kind of batteries, and the quality is also various. So we suggest to use the NCR18650B from PANASONICPanasonic. Also '''do not use''' 18650 battery with built-in protection circuit for X728.
</pre>
Q9: Are the batteries on X728 hot-swappable? In other words, can I connect an external power supply and swap the batteries out while that is on?
A:Sorry, the batteries on X728 is not support hot-swappable. Please cut off the power off to swap the batteries.
A:No, the RTC function runs on the 18650 batteries. It will "lose" time if you remove the batteries.
<span style="color:red;font-weight:bold">Q11: What will lead to the X728 board be burnt out?</span>
A: Please make sure the polarity of battery is "+" to "+" and "-" to "-" and match with the "+" "-" mark on battery holder. The battery protection chip IC will be over-current, heat and then burnt if one or two of the batteries are connected reversely. PS: the X728 board will not be burnt immediately if one or two of the batteries are connected reversely.
Q11: What frequency does X728 use in the I2C communication bus used to communicate with RPI?
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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