View source for X728-hardware


{{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|800px|X728-V1.3-Interface]]

'''X728 V1.2'''

[[File:X728-IMG-7960-1.jpg|800px]]

[[File:X728-IMG-7979-1.jpg|800px]]

==Power Jack and Connectors==
{| class="wikitable collapsible collapsed"
| Power input || 5Vdc +/- 5% ,≥3A
|-
| DC Power Plug Size || 5.5*2.5mm
|-
| USB power in socket || Type-C
|-
| UPS power output || 5.1Vdc 8A
|-
| Power output connector || XH2.54mm 2pin
|}

# X728 powers the Raspberry Pi via the 40-pin header (Pin 2 & 4)
# 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==
{| class="wikitable collapsible collapsed"
! Jumper Name !! Usage
|-
| PLD
(Power loss detection)" 
|| Short - AC Power loss or power adapter failure detection enabled
<span style="color:red;">(Active if power adapter disconnected)</span>
Open  - Power loss detection disabled
|-
| AON
(Auto power-on)
|| Short - Auto power-on when power applied
<span style="color:red;">(Will delay 3 seconds before powering on)</span>
Open - Auto power-on disabled
|-
| ASD
(Auto shutdown)
|| Short - Automatic shutdown enabled when battery low (≤3Vdc )
<span style="color:red;">(Battery must be >3V and installed before enabling this function)</span>
Open - Automatic shutdown disabled

Procedure to enable ASD function --IMPORTANT
  1. Battery voltage must be >3Vdc
  2. Insert the battery into the holder
  3. Wait 3 seconds then insert the jumper
  4. If the jumper inserted before battery, remove
      battery & jumper then repeat step 1, 2 and 3.
|}

==Connector for External Power Switch==
{| class="wikitable collapsible collapsed"
! Pin No. !! Pin Description
|-
| 1 ||  Power on/off control connecting to switch
|-
| 2 ||  Ground
|-
| 3 ||  Ground
|-
| 4 ||  LED+ for power on, rebooting and shutdown
|}

# Please use <span style="color:red;">momentary</span> switch only and don't use latching switch 
# Connector - Pitch 2.0mm 4pos

==Power button (Script for power mgnt installed)==
{| class="wikitable collapsible collapsed"
| Press and Release ||  Raspberry Pi and X728 turn on
|-
| Press and hold for 1~2 seconds ||  System rebooting 
|-
| Press and hold for 3~7 seconds ||  System shutting down 
|-
| Press and hold for >8 seconds ||  Force shutdown
|}

==Function LEDs==
{| class="wikitable collapsible collapsed"
! LED Name !! Usage
|-
| BAT LOW || LED red on indicates battery low (≤3.0Vdc) or blue power button pressed (Jumper for ASD inserted)
|-
|  || 
|-
| 5V OUT || LED green on flashing indicates 5V power out and UPS powered by battery
|-
| AC FAIL || LED red on indicates AC power loss or PSU failure or PSU disconnected
|-
|  || 
|-
| PWR || LED blue indicates
Stays on - Power on
Blinks rapidly - system rebooting
Blinks slowly - Shutting down
|}

==Fuel gauge - LED Indicator==
<span style="color:red;">Operation of Discharging:</span>
{| class="wikitable collapsible collapsed"
! Capacity C (%) !! D1 !! D2 !! D3 !! D4
|-
| C ≥75% || ON || ON || ON || ON
|-
| 50%≤C＜75% || ON || ON || ON || OFF
|-
| 25%≤C＜50% || ON || ON || OFF || OFF
|-
| 3%≤C＜25% || ON || OFF || OFF || OFF
|-
| 0%＜C＜3% || Flashing || OFF || OFF || OFF
|}

<span style="color:red;">Operation of charging:</span>
{| class="wikitable collapsible collapsed"
! Capacity C (%) !! D1 !! D2 !! D3 !! D4
|-
| Fully charged || ON || ON || ON || ON
|-
| 75%≤C || ON || ON || ON || Flashing
|-
| 50%≤C＜75% || ON || ON || Flashing || OFF
|-
| 25%≤C＜50% || ON || Flashing || OFF || OFF
|-
| C＜25% || Flashing || OFF || OFF || OFF
|}

==PCB Layout==
<gallery>
X728-PCB.png|X728 V1.3 PCB Layout
X728_V2.0_PCB_Layout.jpg|X728 V2.0 PCB Layout
X728-V2.1-PCB.png|X728 V2.1 PCB Layout
</gallery>

==18650 battery dimension==
[[File:18650size.png]]

<span style="color:red;">Please use high quality batteries from Samsung 35E 18650 lithium battery, Panasonic NCR18650B, Toshiba, etc. Do not use the 18650 battery with built-in protection circuit because it will limit the discharge current.</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]]

Return to [[X728]]

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[[Category:Product Manual]]
[[Category:Raspberry pi]]