Home     Products     Web Store       Product Customization       OEM/ODM     Contact  
     
    Function Description    X728          
     
 
 
 
Power Jack and Connectors
6-Pin Function Header
  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

 1. X728 powers the Raspberry Pi via the 40-pin header (Pin 2 & 4)
 2. Don't power the Raspberry Pi via the Pi's type-C USB socket
 3. X728 can be powered via the onboard DC jack
or Type-C USB
    power socket
Jumper Name Usage
PLD
(Power loss detection)
Pin 1&2
 Short - AC Power loss or power adapter failure
            detection enabled
          (Active if power adapter disconnected)
 Open  - Power loss detection disabled
AON
(Auto power-on)
Pin 3&4
 Short - Auto power-on when power applied
     (Will delay 3 seconds before powering on)
 Open - Auto power-on disabled
ASD
(Auto shutdown)
Pin 5&6
 Short - Automatic shutdown enabled when
              battery low (3Vdc )

  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.
 Open - Automatic shutdown disabled
 
 
Connector for External Power Switch
Power button (Script for power mgnt installed)
Pin No. Pin Description
1  Power on/off control connecting to switch
2  Ground
3  LED+ for battery low  indicator
4  LED+ for power on, rebooting and shutdown

 1. Please use momentary switch only and don't use latching switch 
 2. Connector - Pitch 2.0mm 4pos
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
Fuel gauge - LED Indicator
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
Operation of Discharging
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

Operation of charging
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

Pins and GPIO used
 
18650 battery dimension
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)
 
Do not use 18650 battery with built-in protection circuit
 
     
    Board Assembly
     
 
Push screws (M2.5*6mm) up through the mounting hole on the underside of the Raspberry Pi.
 
Screw the F/F spacers (M2.5*20mm) down until it is hand tight
 
     
a) Plugs the X728 board straight into your Raspberry Pi's
    GPIO header
b) Double check polarity of battery's connector before
    placing 1860 batteries into the holder
 
Optional -For use with X728-A1 cooling fan.
Screw the F/F spacer (M2.5*12mm) down until it is hand tight
 
     
 
 
Plugs the X728-A1 board straight into your Raspberry Pi's GPIO header and screw down (M/F spacer M2.5*21mm)

 
Plugs the X728 board straight into your Raspberry Pi's GPIO header and screw down (Screws M2.5*5mm)

     
Optional -For use with X728-A2 2-Cell battery holder 
Unscrew the 4 screws on the underside of the Raspberry Pi
 
  Push M/F spacers (M2.5*23mm) up through the mounting hole on the underside of the Raspberry Pi and screw down

 
 
  a) Double check polarity of battery's connector before placing
    18650 batteries into the holder

b) Place the X728-A2 on the underside of the Raspberry Pi
    and screw down (M2.5*5mm screws)
  
c) Plugs in the 2-pin power cable into the "BATT' female
   sockets on the X728 and X728-A2 board
 
   
   
     
 
 
       
 
     
  © 2018 SUPTRONICS TECHNOLOGIES LIMITED, ALL RIGHTS RESEVERED