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