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

[pantvas]

hi try this YouTube video https://www.youtube.com/watch?v=hPKckby54uA explain how to use it with lot of details

[pantvas]

Hello to all , i like to share me experience with ch341a programmer , i have win10 and 95320 (B8 i thing at the end ) eprom . First unsolder the chip and connect the chip to the programmer, download the last software (AsProgrammer_2.0.3a), install the drivers using the driver inside on asprogramer folder (not use any mod ),connect the programmer to my normal pc usb port and start the readings. The first readings give me random ff or random data, next disconnect the programmer and put it in usb 3.0 hub with external 5v power rail connected to my pc power supply directly on 5v rail (not on normal external power supply that cams with usb 3.0 hub ) and start to read the 95320 again, all my readings and writings is accurate with usb 3.0 hub with out any error or random data. I am not a electronic expert but i thing that behave of the programmer looks like don't like the normal usb power supply of most pc M/B and possible laptops M/B , i recommend if you don't have a setup like my, to follow the instructions of the first post and add the 1000uf cap on the 5v rail. Looks like the ams 1117 power regulator drain to mach power and the normal usb pc port can't handle it, as a result to have a bad readings. This programmer made to read 3.3 volt chips possible not have any problem r /w 3.3 volt chips but if you try to read 5v chips is mission impossible with the normal usb power of same M/B.

Thanks all for your time and very helpful information on this forum.

My setup is :

IMG_20220809_100924.jpg


IMG_20220809_100842.jpg

usb 3.0 hub is :

USB Hub LogiLink UA0227 3.0

[djsteli]

Hello everyone, best simple way to program M95320 with ch341a programmer:
1. make a small cut in the CH341A PCB
2. install a jumper between 3v and 5v
3. download software CH341a FWH Version 12062022.zipcut1.jpgcut2.jpgJumper.jpg

[renoraines]

Hi. What with pin changing? Need I this change? 5,6 to 4 2to6 ......?

[fuzz1]

Hi. What with pin changing? Need I this change? 5,6 to 4 2to6 ......?

Hi
I'm still trying to figure out what you wrote

[al70]

There's a video on YouTube shows how to make the modifications

[Jwaili]

Does this programmer really need modification ?
Check out this vid https://www.youtube.com/watch?v=7_mnuuXyPiI

[Electronics27]

Hi all. i programed 2012 polo eeprom of 7V ecu using M95320 eeprom with no modification to the ch programer using asProgrammer
Regards

[racoxd]

Hi, I'm coming from google as this topic is quite popular and well indexed. So, I'm trying to read data from a RCM module (airbag) from car - chip ST 95640RT more info.
I did the 5V mod by making the cut as #93 suggested and using a jumper for 3.3v-5v.
Images:
jumper.jpg
5v_cut.jpg
The problem is: as soon as I put the clamps/clips on the chip, programmer disconnects from PC (thus the LED dims). See video:

and then I just get error "IC Not Responding" in AsProgrammer.
So... does anyone have ANY idea why this happens?

I'm using USB 3.0 and Windows 10 64-bit.

[sebage]

I think this would be one of the reasons.

[racoxd]

You're right, I was doing so many back and forths that I eventually did get that wrong. I now swapped the board around, see pic:
1pin_switched.jpg
but still the same issue - ch341a disconnects from PC when clips are on the chip

[fuzz1]

Try without using clip and the clip contact are usually so big that sometimes they touch two legs on the chip

[racoxd]

That's the thing, it is an airbag module so that's why I'd rather use non-intrusive clips instead of unsoldering.
And the clips seem to align the chip legs perfectly.

[racoxd]

So I just bought a new ch341a programmer & clips (now with a blue plate). I plugged in everything correctly, didn't do the 5V mod and... same thing. If clips on, programmer turns OFF (to prevent damage maybe?).
diagram.jpgnew_ch341a.jpgredwire_1pin.jpgchipClips.jpg
is the chip dead or...? If it is, I'm screwed.

//edit
I've just used it to read my laptop BIOS chip and it worked fine! No issues there, it both detected chip and read data successfully which means programmer is fine, so I think it's either:
1) chip is f'd up.
2) chip being soldered causes interference with the rest of circuit.
I'm novice so these are just speculations.

//edit2
I also measured voltage on MIOS/MOSI/CS/CLK pins and they all output 5V on both of my ch341a programmers. While this is not an issue for me because the chip requires 5V anyway, I believe they all should have 3.3V from factory so that's weird.
pinsVoltage.jpg

[fuzz1]

Reading in circuit is not recommended. It will power up the MCU and corrupt the reading