AS7058 datasheet(35/199 Pages) AMSOSRAM

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AS7058

Functional description

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7.5.1.2

Multi measurement

The Multi Measurement operation mode is used to further enhance signal quality and allows

for on-chip averaging over a predefined number of measurements. At the end of the

measurement, one average value is stored to the FIFO memory.

The advantage compared to a standard moving average filter is the reduction of the time

difference between the used sub-samples for averaging. The multi measurement uses multiple

subsample timings with close to 0-time difference in comparison when a moving average filter

is used. The used data is one sub-sample out of one sampling period. This is stacked over

time to achieve the average. Therefore, the overall time until an averaged value is available is

shortened with multi measurement in comparison to a standard moving average filter

approach.

The total measurement time is then related to the amount of multi measurements, which can

be set in the PPG_MODEx register. This functionality can also be used with the Ambient Light

Compensation Measurement modes described in chapter 7.5.2. A simplified timing diagram for

a Single Measurement with activated Multi Measurement is shown in Figure 31.

Figure 31: Multi measurement mode – simplified timing diagram

Photodiode Selection

Photodiode Offset Current

LED On

ADC Modulator

ADC Reset

SINC Downsampler

Sample Data

Average Data Multi Measurement

n – times

. . .

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