Jetson Tx2 Battery Power Precise Specs

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi

I have followed a several posts here describing how to power the Jetson TX2 development board but still have no successful test. I wanted to ask if there are any exact specs for this.

I have looked at:

Here is what I have tried:

  • Initially tried to power it with a 14.4V & 22.6V (2/3 * 7.2V 5Ah lipos) setup connected to other components. Red power light is on but device does not boot up when I press the power button
  • Tried to power it separately at 14.4V and 22.6V (3 * 7.2V 5Ah lipos). The result is the same. Red power light indicates that it’s receiving power, but the device does not boot up.
  • I read in another discussion that you have to add filtering capacitors and I did. I tested up to 600uF Capacitance but saw no difference. I tried this both with other components connected (motor controller, some powered sensors) and also in an isolated setup with just the Jetson + the batteries. I’m ordering some caps and inductors but would appreciate some precise specs. I unfortunately do not have an oscilloscope I can access, but it seems like I might need one just identify the issue.

Strangely, Jetsonhacks has a video where he just plugs in a lipo battery source and a TK1 turns right on :o

Does anyone have any pointers here so I can work towards a reasonably predictable successful setup? What works? How much attenuation am I supposed to add? And should I expect similar issues once the robot is running? I have other loads such as 2 12V motors, another microcotroller and some sensors. Should I just run the Tx2 isolated from everything else?

Thanks for any advice. Happy to answer any questions if needed as well.

3

hello nskapf,

are you using Jetson TX2 DevKit, or you’re having a customize board? in addition, did you enable auto power-on?
please also refer to Jetson TX2 Series OEM Product Design Guide, check chapter-4.0 for the [Table 5. Power & System Pin Descriptions].
thanks

4

Hi Jerry. Thanks for responding.

I am using the DevKit. I do not have auto-power on. Should I ? I do not understand it’s relevance to this so please elaborate.

The link that you shared is a dead-end - there is no document. I searched for and found this document at usermanual.wiki: https://usermanual.wiki/Pdf/jetsontx2oemproductdesignguide.2134990230/view

Referencing Chapter 3.3 Power Sequencing, it seems like the VIN_PWR_BAD# signal is my issue:
VIN_PWR_BAD# signal is generated by the Carrier Board and passed to Jetson TX2 to keep the Tegra processor powered off until the VDD_IN supply is stable and it is possible to power up any standby circuits on Jetson TX2 . This signal prevents the Tegra processor from powering up prematurely before the Carrier Board has charged up its decoupling capacitors and power to Jetson TX2 is stable.

I am now trying to connect with a local university to access an oscilloscope to examine my input voltage while waiting for some caps in the mail. Not really sure what else I can do here so feel free to chime in.

5

I’ve managed to get my hands on some additional capacitors in the last few hours. I have 3660uF in total decoupling capacitance across the power line but the TX2 is indicating receiving power (red light) but is still not turning on. I did a sanity check with the regular adapter and the TX2 still powers on with that.

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hello nskapf,

it’s the link to the file source via Jetson Download Center,
for an alternative way, please visit [url]https://developer.nvidia.com/embedded/downloads[/url] and searching the file [Jetson TX2 Series OEM Product Design Guide] for reference.

7

Finally got things working. I grabbed one of my extra regulators and use that as my filter. It worked (and saved me shopping around for caps and inductors) Hopefully this helps someone out there.

It’s a 300W Step down buck converter. Got it from Amazon.ca a while ago: Amazon.ca

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