Electronics > Repair

[FIXED] Venerable AIM TTI PL303QMD-P needs help - Overvoltage trip error

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Zucca:
Here we go... here what I could sniff on the SPI on the GOOD working board:

Sent:
12 02 00 00 00
Received:
00 00 80 00 01

the above repeats a lot

Sporadically I get

Sent:
51 00 38
OR Sent:
51 00 58
Sent:
51 00 48
OR Sent:
51 00 28

always Received:
FF FF FF


followed by

Sent:
01 FF FF FF FF
here I get multiple possible responses

Received A:
FF 00 00 25
Received B:
00 00 15 C1

and so on, attached the sniffed traffic in .csv files.

Now dive into the ADC IC07 ADS1241 datasheet to understand what it is going on.

cool.

m k:
02 after 12 is a counter, same with 00 after 51.

FF can be a waiting thingy, but after 01 (read data) should be only 24 bits.
So last received is a byte too long, maybe it's just a hiccup.

Zucca:
sniffed the SPI from the bad uC board...



There are a lot more FF FF spitted out from the ADC to the uC.

Since I measured the inputs, and they are okay... I think the next reasonable step is to swap the two ADCs from the two good/bad board and see what happens.

Such a unicorn failure...

PS: the Picoscope for decoding serial is such a champion.

Zucca:
New ADS1241E/1K‎ ordered, finger crossed.

m k:
So single ended input channel 3 and differential 6-7 are open or pulled up.

Channel 5 is sending 32 bits, maybe nothing, but it's also positive once.
Did you check those inputs with a scope?

But anyway, ADC change is pretty affirmative thing.

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