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

1. T208 powers the Jetson Nano via the 40-pin header (Pin 2 & 4)
2. Don't power the Jetson Nano via the Micro USB socket & DC jack
3. 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

1. Please use momentary switch only and don't use latching switch
2. 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

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Anonymous user #9

2 months ago

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In (Pins and GPIOused), pin 10 is NC. Then, I wonder if it is not possible to communicate Uart.

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Anonymous user #8

6 months ago

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I bought your product it worked well at the first time I didn't used Jetson nano for a long time because of newborn baby... Today I started again. powered on.. and after few minutes I heard strange noise from t208 and It didn't turn on again led on and then off It is possible to turn on with dc in(via t208's input) but after boot i found oc alarm and overcurrent warning.

please tell me how I can solve it

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Lisa

6 months ago

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Hi，Please be sure to use a high-quality power supply, as inferior power supply will damage the T208.

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Anonymous user #8

6 months ago

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It was qualified 5V 4A Adapter

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Anonymous user #7

16 months ago

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Hello, I bought two sets of T208 V2.0 and connected with Jetson Nano. When I unplug power plug, both T208 and Jetson nano switched off immediately without power loss detection in both case of FON short and open, while T208 V1.2 which I bought last year works well. Please let me know how I can check the PLD status or anything I misunderstood.

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Harry

16 months ago

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Hi,

Please provide more detail via email to Support@geekworm.com

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Anonymous user #6

26 months ago

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Hello, What kind of battery can I use with the T208 ? (Voltage range, max capacity) I'm asking because most 18650 batteries are 3,7V which I'm not sure is up to the specs.

If you have any reference to give as an example ; I would be glad.

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Lisa

26 months ago

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Hello，

Thanks for your question.please refer topT208#FAQ.

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Anonymous user #5

31 months ago

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I have tested the device with the AON jumper removed, and the t208 behaves as expected when the PLD jumper is in place and the tactile switch is used for power up, however when the AON jumper is installed and power applied to the t208 the blue light comes on and the power on led on the Jetson Nano carrier board lights up but they only stay lit for approx. 4 seconds. After that all LEDs go off and the Jetson Nano can not be powered up using the tactile switch. Can you recommend a way to troubleshoot this problem?

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Lisa

31 months ago

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Hi，

Please check that the T208 is properly connected to the Jetson Nano board. JETSON NANO must be connected to T208, if it is not detected, it will automatically shut down.

If it doesn't solve the problem, please send some test pictures to us[support@geekworm.com],and tell us your order No.;Thanks~

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Anonymous user #4

32 months ago

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Hi,

Is it possible to use both the AON and PLD headers ?

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Lisa

32 months ago

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Hi，

Yes，you can use them both.

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Anonymous user #2

32 months ago

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Sorry,

I meant, is it possible to use both the AON and PLD headers at the same time?

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Lisa

32 months ago

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Yes，you can use AON and PLD at the same time，no conflict between them.

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Anonymous user #3

32 months ago

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Hello, I have been trying to use the jetson nano A02 with T208 with all the batteries installed. When I turn it on from the blue button, it does turn on, and switches off normally, but im finding difficulties with the AON.

When the device is off and is provided with power, it automatically switches on. But when electricity is lost (irrespective of how long) and is back on, AON switches on the device only on power cut and switches off when powered unless done manually in order to calibrate.

How can I solve this issue?

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Lisa

32 months ago

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Hi，

Please unplug the power plug first, and then unplug the power cord connected to the T208.

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Anonymous user #2

33 months ago

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Hi, may I ask, "Don't power the Jetson Nano via the Micro USB socket & DC jack" Does this mean that we shouldn't supply power to the Nano at all an only supply power to the T208 which would in-turn supply power to the Nano? Would anything disastrous happen if we were to do so ?

And, why shouldn't we not use 18650 batteries with a built-in protection circuit. Isn't the protection circuit supposed to help with regulating charge and preventing over-heating?

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Lisa

33 months ago

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Hi，

①T208 is a UPS expansion board, please power to the Nano via T208. Do not reverse power supply!!

②The T208 board has a built-in protection circuit, you can also use a 18650 battery with a protection circuit, but please pay attention to the size of the battery, because many batteries with a protection circuit are larger in size. To avoid using the wrong size battery, we recommend using a battery without a protection circuit.

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Anonymous user #1

33 months ago

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After shutdown, AON boots only after power plug is removed from T208

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