mm9z1j638 The current calibration is inaccurate

[cui1]

hello!

The following figure shows the current tested after calibration according to the AN12301 document scheme. It can be seen that the error of the current value tested after calibration is still very large. I don't know why. Why is the small current error larger?

[Q_man]

Seems there is a systematic issue. Please check the information provided in the AN12301.

Thinks the evaluate:

1. before system calibration:
- what are the COMPensation values of the device
- what are the gain and offset error

2. after system calibration:
- what are the COMPensation values used
- what are the gain and offset error

W.

[cui1]

1. before system calibration:
- The compensation value of the device is 0
- The gain is the value obtained by IFR, and the offset error is 0

2. after system calibration:
- The compensation value of the device is 0
- The calculated value of the gain and the offset error are the calculated values

[cui1]

hello!

Q_Man

I use the current acquisition configuration function in demo as the measurement current, and use the standard current source as the reference current. After obtaining five sets of data, AN12301 is used to calculate gain and bias.

[Q_man]

can you share the values? (as text, not as bmp)

1. before system calibration:
- what are the COMPensation values of the device
- what are the gain and offset error

2. after system calibration:
- what are the COMPensation values used
- what are the gain and offset error