Other Parts Discussed in Thread: TMS320F2811, TMS320F2810
Hi team,
I received a question about TMS320F2812 from my customer. Could you please advise me on the questions below?
[Background]
Temperature is measured by inputting the signal-generated thermistor signal to the AD converter of the F2812.
Two F2812s(I call them as first unit and second unit) are mounted on one control board, and the thermistor signals of two motors are connected to each F2812 one channel.
[Issue]
We found a board with a reading difference of about 80 LSB between the thermistor reading data input to the AD converter of F2812 (first unit) and the thermistor reading data input to the AD converter of F2812 (second unit).
Specifically, F2812 (first unit): 3779/4096, F2812 (second unit): 3693/4096, with a difference of [86 LSB].
[Question]
1. Could you please tell me the ADC reading error, conversion error, etc. of the TMS320F2812ZHHA?
2. Page.70 in the d/s describes the accuracy as follows.
Offset error : -80 to 80 LSB
Overall gain error with internal reference: -200 to 200 LSB
Overall gain error with external reference: -50 to 50 LSB
Is there a possibility of [86LSB] as an individual difference? If so, do you have any documentation on the cause or countermeasures?
[Additional information]
Two F2812s are mounted on one control board (same as the above contents), and when one thermistor signal mounted on the control board is connected to each F2812 to measure the temperature, the temperature measurement data also varies widely.
As for recognition, since the same thermistor signal is input to the two F2812s, I think that the data will be almost the same (even considering some errors). I would like to know if a deviation of about [80LSB] is appropriate as an error in the AD input of the F2812. Since the same thermistor signal is input to the two F2812s, I think that the data will be almost the same (even if some errors are taken into consideration). I would like to know if a deviation of about [80LSB] is appropriate as an error in the AD input of the F2812.
Regards,
Yamaguchi
