Upgrade this fimware, mcu firmware could upgrade via USB, CPLD firmware upgrade via dedicated burner, you could check here
We’re planning to update Tone’s firmware soon, focusing on the MCU and XMOS. If you have special requirements for the CPLD, we can update it separately and send it to you, but it won’t be released publicly for compatibility reasons. If you have any good idea, please let me know, please note your idea here. However, firmware releases won’t be immediate. Besides firmware releases, we also conduct functional testing and verify compatibility with multiple devices, which is quite time-consuming. It may be released before February 2026. This update will impact: Tone2 (MCU + XMOS), Tone2 Pro (MCU + XMOS), BT Magic, Tea, and the Khadas Audio app.
Hello, kenny!
Thanks a lot again!
The Khadas company has truly amazing support! This is serious.
So far, everything is clear to me. When I get started, I may have more questions, then I’ll ask them later with your permission.
First, I’ll use method 1 (USB-C(I2S)), then method 2 (40-pin)
I will also get acquainted with the ideas from users, and if I have any new ideas, I will definitely share them.
I am considering various options for connecting to I2S (usb-c)..
From the description, I see that pins A4 and B4 can output 5V power.
Do I understand correctly that they receive this power from the USB connector (if the power supply is connected)?
What is the maximum current A4 and B4 can produce? (for reference, Luckfox consumes about 150mA).
If there is sufficient current on these pins, then, in theory, can LuckFox be powered from them?
Is it possible to supply power to inputs A9 and B9 from an external power source, powering the DAC itself and simultaneously using power from pins A4, B4, powering LuckFox? — Or is it possible to do only one thing or only the other?
And also, since I’m going to supply unstable battery power, in what voltage range are deviations from 5 volts allowed on both usb-c?
Thanks again
P.S.: I got my Ton2 Pro two days ago — I must say, it sounds unexpectedly good to me! — and this is still with the basic connection — non-balanced RCA (I’m waiting for a package with balanced RCA) and USB. Great little DAC! I’m already very satisfied! And looking forward to what will happen next…
Thank you for taking the time to share your idea about the Tone2 Pro! We truly value feedback from our community, as it helps us improve our products and explore new possibilities.
About your idea:
USB-C(I2S): A4 and B4 could output DC5V, A9 and B9 could Input DC5V at the same time.
When you use two USB-C ports (USB-C (I2S) + USB-C (USB)) to power Tone2 Pro at the same time, the USB-C (I2S) port will be used first to power Tone2 Pro. Our hardware engineers @Eric68 will provide you with more information on the hardware design details later, such as the maximum output current of A4 and B4.
Thanks again for your support of Khadas! We’ll continue listening to our community’s insights to build better experiences together.
Hi Juriy
I could answer your quesions about Tone2 Pro:
Yes,PWR EXT pins can supply power for external devices,mainly for our own product,BT Magic which is a smart bluetooth module.The current depends on the other USB C power. The current of the other USB C need to satisty the condition that the rated current is greater than the native(400-800mA) and PWR EXT current. So I suggest you that your module can not absorb 500mA current. Maybe Luckfox you mentioned is OK.
This condition you mentioned may not be achieved.PWR EXT must absorb current from the other USB C. But I think you can connect your module power to external power source directly,do not passby our Tone2 Pro.
Hello Eric68
Thanks a lot for the clarifications! It’s clear.
I see.
So, can I power my module from an external power supply and simultaneously supply power to the DCIN LPS input from the same power supply to power the Tone2 Pro? Or does the DAC still need power on the other USB-C (USB) input?
What about the internal components of the DAC – do they also safely tolerate a voltage range from 4.5 to 5.5 V?
I would also like to clarify:
When connecting via the I2S bus to the Tone2 Pro, I must supply 3.3 volts of power to the EXT_I2S_DECT input. Is that enough? Do I still need to supply 5 volts of power to the DAC itself (to the USB input or DCIN LPS pins)?
Hi
2.Yes,external power can supply for your module and Tone2 Pro simultaneously,it depends on the current of the external power. If DCIN_LPS pins have power input, USB-C(USB) input is optional.
3.The internal components are LDOs. These supply voltage need to stay this range.
4.Yes,you should give EXT_I2S_DECT high. And adjust input mode to I2S by manual.
That’s how I imagined it. In principle, you already answered this question above, but sometimes I need to repeat it twice to be convincing). I should have sat down and drawn the diagram myself, and everything would have become clear, instead of turning the picture only in my head). And now everything is very clear!
I am very grateful to you for your patience and responsiveness. Khadas’ support is truly amazing – the best I know!
