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T208-hardware
T208 V2.0 Jumper cap function
T208 V1.2 Jumper cap function
T208 Pin Description
Power Jack and Connectors
| Power input | 5Vdc +/- 5% ,≥4A |
| DC Power Plug Size | 5.5*2.5mm |
| Power input connector | XH2.54mm 2pin |
| UPS power output | 5.1Vdc 8A |
| Power output connector | XH2.54mm 2pin |
- T208 powers the Jetson Nano via the 40-pin header (Pin 2 & 4)
- Don't power the Jetson Nano via the Micro USB socket & DC jack
- T208 can be powered via the onboard DC jack or XH2.54 power input connector.
4-Pin Function Header
| 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 |
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 /off |
- Please use momentary switch only and don't use latching switch
- Connector - Pitch 2.0mm 4pos
Power button & control
| Press and Release | Jetson Nano and T208 turn on |
| Auto power off | System shutdown using the GUI |
| Press and hold for at least 3 seconds | Force shutdown |
Function LEDs
| LED Name | Usage |
|---|---|
| AC FAIL | LED red on indicates AC power loss or PSU failure or PSU disconnected |
| PWR | LED blue indicates
Stays on - Power on Stays off - 5V power output off |
Pins and GPIO used
| Pin No. | Usage |
|---|---|
| 2, 4 | +5V power supply |
| 3, 5 | I2C for RTC and battery fuel-gauge systems |
| 6, 9 | Ground |
| 7 | GPIO6 for AC power loss detection (Jumper for PLD inserted, High=power loss,Low=Power supply normal) |
| 10 | NC not connected |
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 |
18650 battery dimension
Do not use 18650 battery with built-in protection circuit