How to use cheap CH341A programmer for read/write 95xxx Eeproms

[dadoCA]

I hope this will help someone, like it did for me. I must say, this is not my solution, I am just sharing it with you. I used this programmer with success to read and write to 95128 EEPROM.

1. Buy a cheap CH341A eerpom from Ebay or Aliexpress. This programmer supports two types of eeprom, 24xxx (I2C) and 25xxx(ISP) series, so on the ZIF socket there are labels which indicate where to insert which type of EEPROM. For reading and writing to those eeproms, 3.3 V power is supplied from the programmer its self. But to write and read to automotive 95xxx series eeproms we need to supply 5VDC. Luckly on the programmer there is 5VDC pin which we will be use to get this power from.

2. Modification 1: 95xxx eeproms are read/write by inserting them to the 25xxx labeled socket and thats where we need to cut the 3.3V trace on the backside on the PCB. Now solder a short piece of wire from 5V pin to pin number one on the socket. Now we have 5V power for our 95xxx eeproms.

3. Modification 2: Add a 1000uF 16V elco capacitor to the USB power line, positive side of capacitor goes to the plus pole, and negative side of capacitor goes to the minus pole of USB power line. By adding this capacitor we stabilize 5V power, and are getting better readings of eeprom content.

4. Install CH341A Programmer Software v1.31 and CH 341A drivers. Run the programm, now there are no 95xxx type of eeproms available in the software, select 25xxx, with same capacity as your chip. And thats it.

I also use AsProgrammer software, it has support for CH341A hardware and 95xxx series eeproms.