Radup wrote: ↑2024-03-30 20:45 Hello,
I am considering buying a Pico Max, it seems kind of what I need for a project of mine. My project involves a lot of sleeping, waking up for a small time to take a photo, then sleeping again. It will run off some LiPo batteries, and there will be a small solar panel (around 50mA or so).

So I was wondering what is the power consumption when the device is idle (everything powered off, clock set to the lowest level, etc.)?
Also, does it take any power when it's shut down? For example, Raspberry PIs still take 30mA or more even when powered off.
One more thing: Is there any way to use the RTC to cause a wake alarm? I mean, is rtcwake working? Or is it only to keep the time, and I need external circuitry to reboot the device?

One more thing: Can I use other camera modules, such as Omnivision? Or is SC3336 the only camera I can ever hope to get it to work?
Thank you!

+ All device shutdown power consumption
According to the uboot development guide provided by Rockchip, the functionality required to put all devices into standby mode and shut down the SoC is currently not supported on Luckfox-pico (rv1106). I attempted to measure the power consumption after disabling some unnecessary peripherals in the device tree, and the operating current is around 60mA.

+ Sleep/wake-up
Unfortunately, the current system does not support rtcwake. The RISC-V MCU integrated inside RV1106 controls operations such as sleep and wake-up. Currently, the information we have only allows controlling the MCU for reset and firmware writing operations, but Rockchip does not provide information on how to write firmware, making it difficult to add functionality similar to rtcwake. Fortunately, the PMU on RV1106 has externally controllable pins, allowing reset operations to be performed by sending pulses through an external device. If sleep functionality is required, the system can be halted during runtime, and to wake it up, a pulse needs to be sent to the RESET pin via an external circuit.

+ Camera adaptation
Camera adaptation requires consideration of the sensor's supported formats and whether ISP algorithms need to be loaded. Images without ISP algorithm processing will have poor display quality. Rockchip provides documentation on ISP usage, which can be referred to for adaptation.

Please refer to the relevant datasheets for more information. https://files.luckfox.com/wiki/Luckfox-Pico/PDF/doc.7z

Thank you for replying. Is the halting pin exposed? And if the system is halted, how much power does it use?

Radup wrote: ↑2024-04-01 11:03 Thank you for replying. Is the halting pin exposed? And if the system is halted, how much power does it use?

Hi，the halting pin is exposed；
Because the circuit design involves three voltage domains, all supplied externally by chips.If the system is halted，It still take 40mA or more.

I see, thank you.
So the power when off is taken by LDOs mostly?
Would it be possible in the future to have a version with better LDOs that don't draw as much current when off?

So if I want to do something like do some light task for a few seconds, then power off for a minute or so, I need to use an external circuit to cut off the entire power, yes?

Radup wrote: ↑2024-04-02 10:34 I see, thank you.
So the power when off is taken by LDOs mostly?
Would it be possible in the future to have a version with better LDOs that don't draw as much current when off?

So if I want to do something like do some light task for a few seconds, then power off for a minute or so, I need to use an external circuit to cut off the entire power, yes?

The power solution we are using is DC-DC, with static current (IQ) in the uA level. We have minimized losses in this regard as much as possible. However, there still seems to be significant current loss in shutdown mode. Personally, I suspect it might be a control issue with the PMU inside the RV1106, but unfortunately, Rockchip hasn't provided relevant documentation.

Additionally, in line with your low-power requirements, I've recently looked into some related documents. There was an SDK update regarding sleep modes, but it didn't delve into many details. The documentation suggests that sleep can be achieved through software, but it only mentions using external pins for wakeup sources. So, for your use case, it seems using an external MCU to control this is indeed a more suitable approach.

Thank you.
I ordered a LuckFox Pico Mini Linux RV1103, it should arrive towards the end of the month.
Is the situation the same for the RV1103? Roughly the same power off power consumption? Is there also no data for its MCU?
Also, what happens if you ask Rockchip for the MCU specs?

Radup wrote: ↑2024-04-03 8:54 Thank you.
I ordered a LuckFox Pico Mini Linux RV1103, it should arrive towards the end of the month.
Is the situation the same for the RV1103? Roughly the same power off power consumption? Is there also no data for its MCU?
Also, what happens if you ask Rockchip for the MCU specs?

In fact, Rockchip has not publicly disclosed any plans regarding an MCU, so we are unable to obtain relevant data. I will inform you of the RV1103 data as soon as I have tested it.
Thank you for your support of our Luckfox team.

Crocodile wrote: ↑2024-04-03 10:15

Radup wrote: ↑2024-04-03 8:54 Thank you.
I ordered a LuckFox Pico Mini Linux RV1103, it should arrive towards the end of the month.
Is the situation the same for the RV1103? Roughly the same power off power consumption? Is there also no data for its MCU?
Also, what happens if you ask Rockchip for the MCU specs?

In fact, Rockchip has not publicly disclosed any plans regarding an MCU, so we are unable to obtain relevant data. I will inform you of the RV1103 data as soon as I have tested it.
Thank you for your support of our Luckfox team.

After testing, it has been found that the RV1103 series also has power consumption during power-off, with values similar to RV1106 at 40mA or more

Thanks for looking into it. So in order to reduce this power to almost 0, one would need to know how to command the MCU on the chip, right?