CH32X035 F7P6 Development Board

Details

CH32X035F7P6 is a low-cost microcontroller that utilizes the QingKe 32-bit RISC-V4C core, supporting the RV32IMAC instruction set along with self-extending instructions. This microcontroller comes with a built-in USB PHY, supporting USB2.0 full-speed device functions and a USB PD PHY with source and sink capabilities. It features a programmable protocol I/O controller (PIOC), an operational amplifier (OPA) with programmable gain (PGA), an analog comparator (CMP), a 12-bit analog-to-digital converter (ADC), an 11-channel touch-key controller, 3 groups of USART, I2C, SPI, multiple timers, and various other peripheral resources. The device can operate at clock frequencies of up to 48MHz and is compatible with a supply voltage range of 2.0V to 5.5V. The CH32X035F7P6 includes 48KB of flash, 20KB of SRAM, and an embedded USB bootloader.

Discussions

Andelf wrote 02/24/2024 at 03:28

I use HT7333-1 for my CH32X035 board. (https://github.com/ch32-rs/ch32x0-hal/issues/1)

The LDO can operate successfully at 20V (USB PD 3.0). However, it fails when attempting to use 28V VBUS(USB PD 3.1 EPR).

It should be a DCDC.

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Stefan Wagner wrote 02/24/2024 at 09:27

Thanks for the info! I also think that with over 20V VBUS the voltage difference is simply too large for an LDO, I don't even want to talk about the inefficiency. A DC/DC converter is the better option in this case.

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Ken Yap wrote 02/11/2024 at 15:05

You've got a 78L05 between Vbus and Vcc. Won't that not regulate but cause a couple of volts difference between the two buses? Or did you actually install a LDO regulator providing 3.3V like the AMS1117-3.3?

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Stefan Wagner wrote 02/12/2024 at 07:25

It works because the chips operates in the voltage range of 2.0V - 5.5V without any problems. 78L05 is cheap and good enough, that's why I chose it. A better solution (but more expensive) would be the HT7333-1. The AMS1117 is not suitable, because its maximum input voltage is only 18V.

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Ken Yap wrote 02/12/2024 at 07:31

Yes, but does this have implications for the high level of the GPIO pins? Say the regulator drops 2V, then you get 3V for high which might affect the noise margin with 3.3V peripherals. I wonder what the other USB-C dev boards (including other MCUs) do, whether they are limited to 15V power supply.

I just looked at the specs of the Xiao RP2040 and ESP32-C3. They take 5V USB-C. I think the USB-C power sink has to request higher voltages from the power source, and with no negotiation the voltage provided will be 5V.

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Stefan Wagner wrote 02/12/2024 at 15:58

At 5V input you have about 3.3V, at 7V and above 5V. I think the official WCH development board uses the HT7333. However, if you request 20V the LDO might get quite hot if you connect peripherals to it, that draw some current.

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Ken Yap wrote 02/13/2024 at 00:13

I think it's better to have a known 3.3 V Vcc and just not request higher voltages from the power supply (just don't ask for it and it will default to 5 V), otherwise you're relying on a regulator that doesn't actually regulate within a range of input voltages to drop the voltage to somewhere between 3 and 5 V, requiring peripherals that work on 3.3 V but are 5 V tolerant.

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Stefan Wagner wrote 02/13/2024 at 14:06

This may be true if you don't intend to use USB PD and higher voltages. But then there's no need for the CH32X035. The CH32X033 is cheaper, has all features of the X035 except USB PD and has even more memory. That's why this board is designed for experimenting with USB PD in the first place.

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Ken Yap wrote 02/14/2024 at 00:09

Ok, so it's designed to be used for experimenting with a PD supply that can provide at least 7 V, negotiated, and using 5 V peripherala. Or with 5 V tolerant 3.3 V peripherals if PD is not used.

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Stefan Wagner wrote 02/14/2024 at 07:40

It's designed to work with peripherals that need up to 20V without additional boost converters oder a second power supply. In these cases the board provides stable 5V at the VCC pin and the negotiated voltage (e.g. 20V) on the VBUS pin. As I said before, in my opinion this MCU only makes sense if higher voltages are needed. You can of course replace the 78L05 with a pin-compatible 78l03 if you need 3.3V. I chose 5V because of the smaller voltage difference and the better handling of MOSFETs to control the "high" voltage peripherals.

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Ken Yap wrote 02/14/2024 at 07:43

Fair enough. I was hoping the likes of Elecrow would pick up your design and manufacture it, but I suppose there are a lot of cheap CH32X dev boards out there.

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aaaaaa wrote 02/04/2024 at 21:21

dev need screen, buttons and power for mobility

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Stefan Wagner wrote 02/12/2024 at 07:10

Maybe, but that's not the purpose of the board.

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CH32X035 F7P6 Development Board

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