![]() ![]() By, we can see that the manufacturer recommended to connect a 0.47uF capacitor between RSTI (pin 2) and VCC for improved stability. I don't know why the designer even used a regulator, if it didn't provide a switch to choose 3.3V or 5V levels and supply. And this seems to be the only function of the 3.3V regulator (besides the 3.3V pin on the SPI connector). The problem is that any memory you fit in the socket will be powered from 3.3V. The chip is powered from 5V, so its I/O ports will also use 5V.īasically this is a 5V device. CH341A Mini Programmer PCB (WAVGAT) Now, let's return to the schematic and analyze it a bit. Their offered a the PCB design of the device (only top side, however). Trivial pursuit unlimited pc ita download adobe flash. Further searching lead me to (on AliExpress). So, I analyzed the PCB and came up with the following schematic.ĬH341A Mini Programmer Schematic. But a closer look at the PCB revealed that my programmer does not follow it exactly. If you search, you will find, apparently for this programmer. As you can see, the device also comes with a SMD adapter and some pinheaders for it. ![]() ![]() A quick look at the board reveals the main electronic parts used: CH341A, a 12 MHz crystal required by the chip, a 3.3V regulator, two 7 pin headers and the ZIF ( zero insertion force) socket. But, first of all, let's have a look at the hardware. ![]() Used either for in-system programming or as a stand-alone serial flash programmer for the Atmel SPI programmable.Īlso, some source codes are available from manufacturer. Drivers are available from manufacturer's website (but the site is written in Chinese). The problem is that this device comes as-is, without any documentation or software. A popular device is the so-called ' that you can buy for 2 to 5 USD. The IC is somehow limited in this configuration, because the programmer makes use only of the SPI and I2C interface. The chip is manufactured by Chinese company CH341A is used by some cheap memory programmers. CH341A is an USB interface chip that can emulate UART communication, standard parallel port interface, parallel communication and synchronous serial (I2C, SPI). ![]()
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