Contents
Overview
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 |
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 or Type-C USB power socket
6-Pin Function Header for X728 V1.2
Jumper Name | Usage |
---|---|
PLD
(Power loss detection)" |
Short - AC Power loss or power adapter failure detection enabled
(Active if power adapter disconnected) Open - Power loss detection disabled |
AON
(Auto power-on) |
Short - Auto power-on when power applied
(Will delay 3 seconds before powering on) Open - Auto power-on disabled |
ASD
(Auto shutdown) |
Short - Automatic shutdown enabled when battery low (≤3Vdc )
(Battery must be >3V and installed before enabling this function) 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
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 momentary switch only and don't use latching switch
- Connector - Pitch 2.0mm 4pos
Power button (Script for power mgnt installed)
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
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
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
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 (NEW Add on V2.1 only) |
PCB Layout
18650 battery dimension
Installation Guide
Return to X728
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