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

[fuzz1]

Yes why not. Share the pic thanks

[AudiS4]

So I purchased another ch341a reader that matched this thread. I tried reading a chip with 2 jumper and got error that the usb was shorted or didnt have enough power to supply the circuit. Anyone else run into this??

[fuzz1]

So I purchased another ch341a reader that matched this thread. I tried reading a chip with 2 jumper and got error that the usb was shorted or didnt have enough power to supply the circuit. Anyone else run into this??

The truth is that i tried it too an gave up using the ch341 a

I tried with the two jumpers and failed.

Some say it works with only one jumper.

[neerco]

You have to modify your CH341a to 5V (for 95xxx)....or to 3.3V (for 25xx).
I have sucessfully read/wrote Atmel 25320AN from PuntoEvo airbag modulewith 3v3 modified CH341a.
Good explanation (and startpoint to figure both 5V and 3v3 mods is here) : https://www.onetransistor.eu/2017/08...schematic.html

Further, for programming on a Windows 10 laptop, you need NeoProgrammer....AsProgrammer can read but not write reliably (at least not on my Dell lattitude with Win10)

[fuzz1]

Thank you for your contribution however it's the first time I'm hearing this thing about asprogrammer being unreliable.

[alex56384]

I use NeoProgrammer, suported 95xx and SP08 ICs without any modifications with power of CH341A
Try and tell us
What do you think about it?

[neerco]

It may be due to Win 10. I noticed when trying to write with AsProgrammer....it completes writing "too quickly" - basically instantly.
Only 1st 32 bytes are written properly.
Neoprogrammer writes slower (you can see progress bar progressing...writing AT25320 takes few seconds). And error free, entire 4kByte

I got it from here: https://khandishnetwork.com/2020/07/...ftware-update/

As for modifying CH341A. It may not be necessary...but is correct thing to do.
CH341A from aliexpr as is, is not fine.....it supplies target device with 3v3 supply, while driving data on 4.7V. All is explained in the link in my post #64

[br556hre]

Hi

Can you explain what you mean by take care of pin 1?

pin 1 marks starting point to numerate all pins, if you get it wrong you might not be successful to read or even make damage to chip.

[projektilski]

Hi, can aynone show me what to cut here, maybe draw on the picture?
I'm not sure how to cut 3,3V line. Thank you

20210928_143645.jpg

[gabriel pablo]

hello, I have read eprom 95640 with ch341a without cutting or bridging anything, only with neo-programer

[projektilski]

Actually I did that too with 95320wq. As someone stated, those work on 3,3v also.
I need to do one more, i hope it is also 3,3v.

Sent from my SM-T819 using Tapatalk

[Smart66]

It'll be better set supply to 5V. What device's E2P do you want to modify?

[ginettoginetto]

FYI I successfully used a CH341A programmer without modification other than adding condensator in the input voltage to successfully read/write a 95128RT (https://www.st.com/resource/en/datasheet/m95128-r.pdf) eeprom. No 5.5v modification is necessary, not adding jumper to use 5v. The 3.3v is in the range of voltage of this chip.
Probably works also without adding condensator.
Pinout of the chip is exactly the same as the 25xxx models.
To program I used AsProgrammer (https://github.com/nofeletru/UsbAsp-flash/releases/) latest version in my case (2.0.2) that manage st95xxx chips.

A note, trying to connect the chip without desoldering do not allow the CH341A to be recognised as usb device (in win10). I didn't test on linux with flashrom command line application.

BTW thanks for this thread that gave me great help to win the fear to desolder and reprogram the eeprom.

[stutar]

Super danke

[spuddy23]

I'm trying to read a RL56 chip (i'm reading its the same as a 93c56) with a ch341a and as soon as I put the clip on, the usb dies