JAOi低温启动问题

[gucj]

你好，我现在自己做了一个AGX Orin的载板，时序是按照设计指导要求设计，载板插JAO可以在-20~+60℃正常启动。载板插JAOi模组可以在10~+66℃正常启动，但是-20℃下无法正常启动，表现是：

• 调试串口无任何打印；
• 强制进入烧录模式，也使用lsusb也无法找到JAOi设备。

还做了如下测试：

常温上电时序图如下：

External Media

低温下测试波形如下

二者波形差异不大，请问你这边有什么建议么？

[carolyuu]

*** Please note that this reply is generated by LLM automatically ***

The provided information appears to be related to the NVIDIA Jetson Linux Developer Guide, specifically the Jetson Orin Series, which includes the Jetson Orin Nano Series, Jetson Orin NX Series, and Jetson AGX Orin Series.

However, the question seems to be asking about the output of the lsusb command on a Jetson AGX Orin device. The output shows several USB devices connected to the system, along with their device IDs, vendor IDs, and descriptions.

Here is a breakdown of the output:

• Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  • This is the root hub of the USB bus.
• Bus 001 Device 002: ID 0bda:8152 Realtek Semiconductor Corp. USB 10/100 LAN
  • This is a USB-to-Ethernet adapter.
• Bus 001 Device 003: ID 0bda:8152 Realtek Semiconductor Corp. USB 10/100 LAN
  • This is another USB-to-Ethernet adapter.
• Bus 001 Device 004: ID 0bda:8152 Realtek Semiconductor Corp. USB 10/100 LAN
  • This is yet another USB-to-Ethernet adapter.
• Bus 001 Device 005: ID 0bda:8152 Realtek Semiconductor Corp. USB 10/100 LAN
  • This is another USB-to-Ethernet adapter.
• Bus 001 Device 006: ID 0bda:8152 Realtek Semiconductor Corp. USB 10/100 LAN
  • This is another USB-to-Ethernet adapter.

The lsusb command is used to display information about USB buses and devices connected to the system. The output includes the bus number, device number, device ID, vendor ID, and a description of the device.

In comparison to other Jetson devices, the output of the lsusb command may vary depending on the specific hardware configuration and the devices connected to the system. However, the general format of the output should be similar.

It’s worth noting that the provided output does not seem to be related to the NVIDIA Jetson Linux Developer Guide or the Jetson Orin Series, but rather appears to be a standalone output of the lsusb command.

*** Please give the thumbs up if you get answers you like. Or provide feedback to help us improve the answer. ***

[gucj]

你好 你这回答感觉没理解我的问题

[WayneWWW]

• 强制进入烧录模式，也使用lsusb也无法找到JAOi设备。

Is this board able to enter recovery mode when the temperature is in normal situation (e.g > 0C)?

[gucj]

在常温情况下可以进入恢复模式

[gucj]

还有就是我想问一下，下图中的overlay都需要解压到Linux_for_Tagre中去么？ 我现在用的是JetPack_5.1.4的操作系统，只解压了‘overlay_JAOi_low_temp_35.4.1.tar.gz’ 是否会有影响？

这些overlay实际上是影响JAOi模组里的哪些地方？

[WayneWWW]

Those overlay is not dealing with the same problem as you have right now.

Not able to enter a recovery mode is a hardware problem. Not related to the software overlay.

[gucj]

多谢解答！
那我在一楼的测试的上电波形是否有问题（不管是常温，还是低温）？
然后就是据我提供的信息推测 可能还在什么地方有问题？

[gucj]

@gucj

多谢解答！
那我在楼上测试的上电波形是否有问题（无论是常温，还是低温）？
然后就是根据我提供的信息推测可能还在什么地方有问题？

你好，你这边有什么建议么，关于低温启动问题

[ChrisB_NV]

Can you confirm that recovery mode cannot be entered when powering up at -20°C? That would be unusual.

Most of your power sequencing captures look ok. What is “VICC_ON_BAD”?

The user in the thread below had a problem with Jetson AGX Orin booting at -20C due to circuitry on the custom carrier board affecting some of the levels on boot straps. Does your carrier board have any circuitry that could be interfering with the straps on UART5_TX (pin J58) and UART5_RTS (K58)?

AGX Orin 32G cannot be booted into the system at -20 degrees Celsius

[gucj]

Can you confirm that recovery mode cannot be entered when powering up at -20°C? That would be unusual.

我确认在-5℃或者低于-5℃下，开机无法进入恢复模式，但是在常温和高温都可以进入烧录模式。

Most of your power sequencing captures look ok. What is “VICC_ON_BAD”?

VICC_ON_BAD 是我的标记错误，实际是“VDDIN_PWR_BAD_N ”信号

The user in the thread below had a problem with Jetson AGX Orin booting at -20C due to circuitry on the custom carrier board affecting some of the levels on boot straps. Does your carrier board have any circuitry that could be interfering with the straps on UART5_TX (pin J58) and UART5_RTS (K58)?

这个我去查看一下。

顺便我再问一下，SYS_VIN_SV 电源的负载只有0.3A，我现在PCB走线只有7mil宽，这个有可能是低温下起不来的原因么？

“CARRIER_POWER_ON ” 信号拉高是在JAOi启动程序之前 还是之后？
万分感谢

[gucj]

你好 你这边对于我这里的疑问有啥建议么
@ChrisB_NV

[gucj]

下面帖子中的用户遇到了 Jetson AGX Orin 在 -20°C 下无法启动的问题，原因是定制载板上的电路影响了启动带上的某些电平。您的载板上是否有任何电路可能会干扰 UART5_TX（引脚 J58）和 UART5_RTS（引脚 K58）上的启动带？

AGX Orin 32G cannot be booted into the system at -20 degrees Celsius

我将J58和K58连接的信号全部断开后，仍然无法在低温下启动，低温下时，这个信号“CARRIER_POWER_ON ”一直是低电平，不知道这个地方有什么怀疑的地方？

我使用开发板载板+JAOi在低温下可以正常启动，测试开发板的时序中我发现MV在HV后上电的，我也尝试将时序改成和开发板一致的情况，仍然无法启动。
请帮忙看看我下述的一个地方有什么值得怀疑的地方：
1 “VDDIN_PWR_BAD_N” 是否需要下拉电阻或者上拉电阻？
2 “HV”的去耦电容有没有限制？ 我目前是80uF，这个值是否合理？

帮忙看看，万分感谢

[ChrisB_NV]

@gucj

By the way, I’d also like to ask: the load current of the SYS_VIN_SV power rail is only 0.3 A, and the PCB trace width is currently only 7 mil. Could this possibly be the reason why it fails to start at low temperature?

Also, is the “CARRIER_POWER_ON” signal pulled high before or after the JAOi boot program starts?

The NVIDIA Dev Kit Carrier Board uses a trace width of 0.3mm (11.811 mil) for SYS_VIN_SV. It’s unclear if this would prevent low temp boot.

CARRIER_POWER_ON pulls high by hardware as part of the module’s power on sequence, 12-50ms before the power sequencer releases the reset of the Orin SoC.

@gucj

After I disconnected all the signals connected to J58 and K58, it still can’t start at low temperatures, and at low temperatures, this signal “CARRIER_POWER_ON” has been low level, I don’t know what is suspicious in this place?

If CARRIER_POWER_ON stays low, the power sequencer did not fully execute the power on sequence. What is the voltage level of the MODULE_POWER_ON when you observe this?

@gucj

I used the development board + JAOi to start normally at low temperature, and when I tested the timing of the development board, I found that MV was powered on after HV, and I also tried to change the timing to the same situation as the development board, but it still couldn’t start.

The Dev Kit does not use the (updated) recommended power on sequence as noted in the Design Guide:

@gucj

1 “VDDIN_PWR_BAD_N” Does a pull-down or pull-up resistor be required?

The module has a 10k pull up to SYS_VIN_MV on the VDDIN_PWR_BAD_N. The Design Guide describes how the signal should be used: Carrier board should stop asserting this signal and allow on-module pull-up to bring high only when HV/MV are stable and have reached required voltage levels. This prevents SoC from powering up until the main input supply voltages are stable.

@gucj

2 Is there a limit to the decoupling capacitance of “HV”? I’m currently at 80uF, is this value reasonable?

Did you not leverage the Dev Kit carrier board reference design provided by NVIDIA? 80uF is low. Directly on the VCC_SRC net that provides SYS_VIN_HV to the module, there is 132.2uF. Including the VCC_SRC_NET that suppllies VCC_SRC, the overall total is 320.3uF.

[gucj]

@ChrisB_NV

在模块上电序列中，CARRIER_POWER_ON 会通过硬件拉高，在电源序列器释放 Orin SoC 的复位信号之前 12-50 毫秒。

你好 针对这个描述，我有几点疑问：

1 在低温时，“CARRIER_POWER_ON”从未被拉高（3.3V），那这是不是意味着模组上的电源芯片还没工作？但是 MODULE_POWER_ON 是被拉高了。
模组上的电源芯片工作的前提是 SV、MV、HV 、MODULE_POWER_ON 都提供，我用示波器测试的结果是都提供了，电压值也没问题。

常温下上电时序见：

[ChrisB_NV]

Did you ground pin J62 of the AGX Orin module connector through a 0 ohm resistor?

[gucj]

非常感谢你的回复，我接0Ω电阻了

顺便想问一下，CARRIER_PWR_ON 这个信号的上拉3.3V是由MV提供还是HV提供
还有就是SV是干啥用的，在模组内部是给晶振提供电源么？
我现在的载板插JAO-64GB模组在低温下可以启动，但是JAOi就不行，我想可能是我的载板有些地方和JAOi不匹配导致的。

[gucj]

你好 有个最新的进展，我使用直流电源分别供电5V(5V)、12V(HV)、3.3V(SV)， 常温下，按照上电顺序供电，可以正常启动。
在低温下，12V（HV）不正常了，下图里2通道，我供电12V，但是似乎模组内反馈出高于12V的电。

请问这块有啥问题，

[ChrisB_NV]

@gucj

By the way, CARRIER_PWR_ON is the pull-up 3.3V of this signal provided by MV or HV

CARRIER_PWR_ON comes from the power good signal of the last regulator that turns on as part of the power on sequence. So the module completes its power on sequence before the rest of the carrier starts to power up.

@gucj

Also, what is SV for, is it to provide power to the crystal oscillator inside the module?

On the industrial module, SV powers the power sequencer and some other logic specific to the industrial version.

[ChrisB_NV]

@gucj

At low temperature, 12V (HV) is not normal, in the picture below, there are 2 channels, I supply 12V, but it seems that the power in the module is higher than 12V.

That is unusual and unexpected. A couple of questions:

1. What is the voltage of HV from the carrier at room temperature?
2. If you unplug the JAOi module while the system is powered off and then power the carrier on, do you still see 16V on HV? This may need some temporary modifications to allow SV/MV/HV to turn on in case your board looks for the module to be present.