(besides the 3.3V pin on the SPI connector). And this seems to be the only function of the 3.3V regulator The problem is that any memory you fit in the socket will be poweredįrom 3.3V. The chip is powered from 5V, so its I/O ports will also use 5V. Now, let’s return to the schematic and analyze it a bit. Programmer PCB until I got a complete schematic. I took the multimeter and started to trace lines on the Pinheaders on the sides of the ZIF socket which I wanted to know what Programmer, but it wasn’t exactly right and complete. The programmer can be bought with additional sockets and adapters, some of them with voltage shifting circuits.Īfter some searching I found a schematic of a CH341A based Pin headers and the ZIF ( zero insertion force) socket. But, first of all, let’s have a look at the hardware.Ī quick look at the board reveals the main electronic parts used:ĬH341A, a 12 MHz crystal required by the chip, a 3.3V regulator, two 7 There are open source applications that support this programmer. Also, some source codes are available from manufacturer. Drivers are available from manufacturer’s website (but the site is written in Chinese). The problem with these devices is that you get them without any documentation or software. But, first of all, let’s have a look at the Also, some source codesĪre available from manufacturer. Website (but the site is written in Chinese). Drivers are available from manufacturer’s The problem with these devices is that you get them without anyĭocumentation or software. A popular device is the black CH341A MiniProgrammer that you can buy for 2 to 5 USD. The SPI and I 2C interface and leaves a lot of pins unconnected. Limited in this configuration, because the programmer makes use only of The chip is manufactured by Chinese company Jiangsu QinHeng Ltd.ĬH341A is used by some cheap memory programmers. Standard parallel port, memory parallel port and synchronous serial CH341A is an USB interface chip that can emulate UART communication,
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