Eadc Averaging; Consecutive Mode Of Averaging By Eadc; Spatial Mode Of Averaging By Eadc - Texas Instruments UCD3138 Technical Reference Manual

Error ADC and Front End Gain

3.1.5 EADC Averaging

It is possible to average 2, 4, and 8 EADC samples. There are two modes of EADC Averaging –
consecutive and spatial. It is true averaging – the samples are added and then divided by the number of
samples. There is also a weighted average available.
Consecutive mode takes the specified number of samples immediately after the sample trigger, at the
EADC sample rate of 16 or 8 MHz. It then triggers the Filter and provides the average of the samples as
the filter input.
Spatial mode takes one sample for each sample trigger, and sends averaged data to the filter after the
specified number of sample triggers.
The average error value can also be read from the EADC Value register:
eadc_error = FeCtrl0Regs.EADCVALUE.bit.ERROR_VALUE;
This value will reflect the averaging value if averaging is enabled. Otherwise it will be the same as the raw
EADC value mentioned earlier.
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Front End
Figure 3-3. Consecutive Mode of Averaging by EADC
Figure 3-4. Spatial Mode of Averaging by EADC
Copyright © 2016, Texas Instruments Incorporated
SNIU028A – February 2016 – Revised April 2016
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