Inquiry Regarding Current Sink Capability of GPIO on Jetson Xavier NX

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
1

Hi,

Could someone please provide information about the current sink capability of the GPIO02 pin on the Jetson Xavier NX?

We are attempting to reset the camera using this pin, but it remains at 1.1V instead of going to logic 0. Any insights or suggestions would be greatly appreciated. Thanks in advance!

Regards,
Natesan S

3

Hi Sivam_Natesan,

Are you using the devkit or custom board for Xavier NX?
What’s your Jetpack version in use?

What do you mean about the “Sink Capability”?

Is your issue about “you can not control GPIO02 to low”?
Could you share the steps how you control this pin?

4

We are using custom carrier board. Jet pack version 4.5

We use GPIO02 as a reset pin for our camera. GPIO02 is at 1.8V by default, as soon as the driver loads GPIO02 should make the camera reset pin as low, instead it stays at 1.1V. Why it is not going to 0V?

But GPIO02 goes to 0 without connecting camera.

So we want to confirm the current sink capability of GPIO02.

Regards,
Natesan S

5

Do you mean the following GPIO02 pin?

image
image1756×30 2.6 KB

How do you configure this pin in pinmux and also in device tree as the reset-pin for camera?

Could it be caused from the camera side?

6

Yes, we use the same GPIO(SOC_GPIO23) pin as you stated.

We have included our camera driver and device tree in Xavier NX BSP(L4T 32.5) without altering the pinmux.

We defined the particular GPIO(Output) in device tree as below.

gpio@2200000 {
	status = "okay";
	camera-control-output-low {
		status = "okay";
		gpio-hog;
		output-low;
		gpios = <CAM0_RST_L 0>;
		label = "cam0-rst";
	};
};

Regards,
Natesan S

7

What’s your definition for CAN0_RST_L?

8

define CAM0_RST_L TEGRA194_MAIN_GPIO(Q, 3)

9

Is this you current issue?

Since it could be 0 when you disconnect the camera, I would suspect if something from camera causing it staying at 1.8V. Could you also check this with your camera vendor?

10

Hi,

The camera reset pin goes to logic 0, and the camera resets independently. Similarly, GPIO02 of Xavier NX also goes to logic 0 when no camera is connected. However, when we interface GPIO02 with our camera, it remains at 1.1V instead of logic 0. Therefore, we suspect that the current sink capability of GPIO02 might be the issue. Can you please provide clarification?

Regards,
Natesan S

12

Are you testing on Xavier NX devkit board P3509? Do you mean pin 124 (GPIO02)? If so, there is a pull-up to 3.3V on it.

13

We use a custom carrier board, as it doesn’t have pull-up resistors.

14

The sink current of it is about 3mA. You can check if the load is out of the range.

16

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