| Electronics > Repair |
| [FIXED] Venerable AIM TTI PL303QMD-P needs help - Overvoltage trip error |
| << < (9/11) > >> |
| 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. |
| Navigation |
| Message Index |
| Next page |
| Previous page |