X708-Hardware

4-Pin Function Header for X708 V1.2

❶ Power Jack and Connectors

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(Max.)
Power output connector	2-pin XH2.54mm *2

X708 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
X708 can be powered via the onboard DC jack or Type-C USB power socket

❷ 6-Pin Function Header for X708 V1.0

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	NOTE: ASD fundtion is removed on V1.2 version,but you can achieve this function through software programming. 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

❸ How to connector external power switch

Pin No.	Pin Description
1	Power on/off control connecting to switch
2	Ground
3	Ground
4	LED+ for power on, rebooting and shutdown

❹ Power button (Script for power mgnt installed)

Press and Release	Raspberry Pi and X708 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

❺ Function LEDs

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

❻ Fuel gauge - LED Indicator

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

❼ Pins and GPIO used

Pin No.	Usage	Remark
2, 4	+5V power supply
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)
36	GPIO16 for fan speed: HIGH => fast, LOW=> slow	New added on V1.2

❽ 18650 battery dimension

Please do not use 18650 battery with built-in protection circuit

❾ How to programming to get ASD function on V1.2 version

The following is fake C/C++ code:

while(1) {
  // You need to implement getCurrentVoltage function
  float fVoltage = getCurrentVoltage();
  if (fVoltage <= 2.5) {
  //execute shut down command, "sudo x708off"
  break;
  }
}

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