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__NOTOC__
==Pins and GPIO used==
{| class="wikitable collapsible collapsed"
! Pin No. !! Usage
|-
| 2, 4 || +5V power supply
|-
| 3, 5 || I2C for RTC and battery fuel-gauge systems
|-
| 6 || Ground
|-
| 29 || GPIO5 for power management
|-
| 32 || GPIO12 for power management
|-
| 33 || GPIO13 for power management
|-
| 31 || GPIO6 for AC power loss detection (Jumper for PLD inserted, High=power loss,Low=Power supply normal)
|-
| 38 || GPIO20 for buzzer control <span style="color:red;">(NEW Add on V2.1 only)</span>
|}
no edit summary
{{GD Template Impl}}
==Overview==
'''X728 V2.5'''
[[File:IMG-0449-interface-EN.jpg|800px|X728 V2.5]]
'''X728 V2.3'''
[[File:X728-V2.3-Interface-EN.jpg|800px|X728 V2.3]]
[[File:X728-V2.3-Jumper-cap-function.jpg|800px|X728 V2.3]]
'''X728 V2.1'''
[[File:X728-V2.1-interface-EN.jpg|X728 V2.1 Interface]]
Update:
*New add a buzzer controled by GPIO20
*DC jack is changed from DC5525 to DC5521.
'''X728 V2.0'''
[[File:X728-V2.0-01.jpg|700px|none|X728 V2.0]][[File:X728-V2.0-02.jpg|700px|none|X728 V2.0]]
Update:
* PIN33 (GPIO13) is replaced by the PIN37 (GPIO26) to avoid the I2S interface from v1.3 to v2.0.
'''X728 V1.3'''
[[File:X728-V1.3-Interface.jpg|700px800px|X728-V1.3-Interface]]
'''X728 V1.2'''
[[File:X728-IMG-7960-1.jpg|700px800px]]
[[File:X728-IMG-7979-1.jpg|700px800px]]
==Power Jack and Connectors==
# Don't power the Raspberry Pi via the Pi's type-C USB socket
# X728 can be powered via the onboard DC jack <span style="color:red;">or</span> Type-C USB power socket
==Pins and GPIO used==
<span style="color:red;">PIN33 (GPIO13) is replaced by the PIN37 (GPIO26) to avoid the I2S interface from v1.3 to v2.0.</span>
{| class="wikitable collapsible collapsed"
! Pin No. !! Usage
|-
| 2, 4 || +5V power supply
|-
| 3, 5 || I2C for RTC and battery fuel-gauge systems
|-
| 6 || Ground
|-
| 29 || GPIO5 for power management
|-
| 32 || GPIO12 for power management
|-
| 33 || GPIO13 for power management <span style="color:red;">(For V1.3 and previous versions only)</span>
|-
| 31 || GPIO6 for AC power loss detection (PLD jumper inserted, High=Power loss,Low=Power supply normal)
|-
| 37 || GPIO26 for power management <span style="color:red;">(New add from V2.0)</span>
|-
| 38 || GPIO20 for buzzer control <span style="color:red;">(New add from V2.1 )</span>
|-
| 36 || GPIO16 for battery charging control <span style="color:red;">(New add from V2.5 )</span>
|}
{| class="wikitable"
! Pin No. !! GPIO No. !! Remark !! Ver 1.2 !! Ver 1.3 !! Ver 2.0 !! Ver 2.1 !! Ver 2.2 !! Ver 2.3!! Ver 2.5
|-
| 2, 4 || || 5V || √ || √ || √ || √ || √ || √||√
|-
| 3, 5 || || I2C for RTC and battery fuel-gauge systems || √ || √ || √ || √ || √ || √||√
|-
| 6 || || Ground || √ || √ || √ || √ || √ || √||√
|-
| 29 || GPIO05 || Power management || √ || √ || √ || √ || √ || √||√
|-
| 31 || GPIO06 || for AC power loss detection<br>(PLD jumper inserted, <br>High=Power loss,Low=Power supply normal) || √ || √ || √ || √ || √ || √||√
|-
| 32 || GPIO12 || Power management || √ || √ || √ || √ || √ || √||√
|-
| 33 || GPIO13 || Power management || √ || √ || || || || ||
|-
| 37 || GPIO26 || Power management<br>GPIO13 is replaced to GPIO26 from Ver 2.0 || || || √ || √ || √ || √||√
|-
| 38 || GPIO20 || for Buzzer control || || || || √ || √ || √||√
|-
| 36 || GPIO16 || for battery chargingcontrol || || || || || || ||√
|}
==6-Pin Function Header for X728 V1.2==
|}
==PCB Layout==
<gallery>
[[File:18650size.png]]
<span style="color:red;">Do not use 18650 battery with built-in protection circuit</span>
==Raspberry Pi Official GPIO Expansion describe==
[[File:RPI-GPIO-expansion.png | 800px]]
==Installation Guide==
Installation Video for X728+X728-A1+X728-A2: https://youtu.be/q_TmqMNhJPM
{{#ev:youtube|https://youtu.be/q_TmqMNhJPM}}
[[File:X728+X728A1+X728A2-Installation-Guide.jpg|800px|X728]]