Hi,
try to understand the Status info of the ADS131E0x, but ...
What do I do: I use a ADS131E06, so 6 channels available. This implies, that 2 bits of FAULT_STAT_P and two bits of FAULT_STAT_N are don't care. Unfortunately I didn't found any note about that, so should this bits 0 or 1 ???
My guess is 0 cause a channel not there couldn't generate a fault.
I use following Input mux Settings for the first tests:
Channel 0: Short
Channel 1: MVDD
Channel 2: MVDD
Channel 3: Short
Channel 4: Input (there is a small filter/protection circuit, but no Signal)
Channel 5: chip temperature
I read the three Status Bytes as C0 03 FA
==> C is correct, see Manual. A is correct cause I wrote this value into the GPIO Register.
Fault-Stat_P is all 0, ok, no channel overdrives the Input range and the two bits for the channels not present read as 0s, a channel which isn't there shouldn't generate a fault ..
Fault_Stat_N is 0011 1111: Channel 0 within Limits, ok. Channel 1 within Limits, ok. Channel 2 out of Limit ??? Here Vdd/4 is present, as the Manual told me. Ok, maybe we do single ended measurement, so the negative Input is tied to ground. But hey, measuring the analog supply with channel 1 should show same behaviour, if that is true, but didn't. Strange.
Channel 3 is short, same as channel 0. But different Status Infos???
Channel 4 is temperature, here the N Input is tied to a Diode, so it defenitly isn't tied to ground, isn't it. Also 1, which denotes fault??
Ok, Otherway round: As there is no info which bit corresponds to which channel, lets reverse the info.
Channel 6 and 7 (not present on my chip) reads 0, no fault. All other Show a fault. Ok, maybe short means shorted to ground not just connecting P and N. Now the two shorted Inputs Show the same Status. The both channels measuring the supply Show also 1, ok tied to ground. But temperature also Shows 1 ??? There should be a Diode between N and ground ???
And yes, the data I read on all of the channels is correct, I get correct values for the shorted Inputs (~130µV), correct values for the supplies and a correct temperature reading. So no channel is powered down or what ever Problems can arise.
The gain of the PGA for all channels is 1
Please tell me, how to interprete the Status info. Which bit corresponds to which channel and why is the pattern as it is for my Input mux Settings.
Thanks a lot.
With best regards
Gerhard