The Volkswagen RCD300 tape was in safe 2 mode. To learn the password, 95640 eeprom had to be read and the RCD300 password had to be obtained via the PC program, it took some effort, but I took the password and started the tape. CH341A EEprom Flash Programmer was used to read 95640 eeprom on RCD300 main board. CH341A device’s software (CH341A-programmer) has no support for 95xxx eeproms. I solved this problem with different program.
I said let’s try it with the SMD Soic cable clip that comes next to the CH341A module. By the way, use cream flux in this type of work, the dismantling process is very fast.
I used As Programmer, 95640 eeprom was read without any problem, and when I searched, I learned that the new version of the program was shared with the name of Neo programmer. With this program, CH341 exceeds the programmer limits, it can be programmed in many eeprom, flash as well as integrateds such as Atmel series Nuvoton. It also has USBasp programmer support. Details are in the video…
CH341A RCD300 Code and Details
CH341A programmer ZIF 5 Volt Modification
The “black pcb” version of the CH341A programmer also has a 3.3 volt voltage regulator to reduce the 5 volts from the USB socket. The VCC voltage of the ZIF socket is 3.3 volts.
When the 28 VCC pin of the CH341A IC is separated from the board and connected to the output of the AMS1117-3.3 regulator IC (SOT-223 middle leg 3.3V output) with a cable, when you short-circuit the 3.3.v – 5v header output, the ZIF becomes 5 volts in the socket, and 3.3 volts in the open circuit. ..
In other words, short-circuiting the input and output of the AMS1117-3.3 regulator is not a very healthy method, but it works. In addition, on the Neo programmer, which voltage you will choose according to the IC you have chosen is shown at the bottom. In addition, information is given about whether to use a ZIF socket connection or an adapter.
Note: I programmed the 95640 eeprom with CH341A. If you don’t need it, don’t risk it. CH341A can break when removing pin 28. Be careful. Also, for the CH341A 5V modification you see in the pictures below, there is a work done by cutting the 5V line on the PCB without interfering with the IC. (I didn’t try)
NEO PROGRAMMER Supported ICs (29/09/2021)
The Car code decoder program works with the eeprom file. It supports the models in the list below.
CH341A programmer 95460 and Other Adapter Diagrams
CH341A Kicad PCB, schematic and List of download LINK for all programs (in TXT format) 28621a.zip pass: 320volt.com
Published: 2022/11/17 Tags: programmer circuit