Is there any particular calibration sequence that we need to use for the AFE4400? We are still learning how to use this device, so I do realize that this might be a naive question.
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Is there any particular calibration sequence that we need to use for the AFE4400? We are still learning how to use this device, so I do realize that this might be a naive question.
It's been a while, so I wanted to revisit these last few questions... again, just to make sure that we understand things correctly. Do we have any criteria for what's "reasonably good"? Also, should we expect the DC readings to be in the range of 0xFFFFF?
I've been able to greatly improve the results by adjusting the gain and LED current, and by enabling stage 2, as suggested.
Do you have any recommendations for how to cancel the extra DC current, as stated in the calibration procedure that you provided? I understand that this can be done using the TIA_AMB_GAIN register (0x21), Do you have any recommendations for how the precise amount of cancellation current should be determined?
Praveen, the procedure that you provided is much appreciated. I've been reviewing, trying different settings, and I think we have a better understanding of how this works.
I have a question, though. In step 3, you suggested turning on the second stage amplifier and using it to "cancel the extra DC current." Are you referring to the ambient light current? If so, it seems to me that the proper approach is to get the ambient light readings from registers 0x2B and 0x2D, then adjust the AMBDAC bits in register 0x21 such that these readings are close to zero.
Is that correct? If so, then how should we interpret the statement "ensure that the data in the ambient phase is not saturated"? Would this pretty much guarantee that the ambient readings would not be saturated, since they'd be close to zero?