AS7058 datasheet(40/199 Pages) AMSOSRAM

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AS7058

Functional description

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Once all four pre-measurements are done the offset current is adjusted correctly to avoid

saturation of the ADC due to ambient light. The upper 4 bits of IOS_PPGx_SUBx registers are

determined automatically with the first four samplings, the lower 4 bits correspond to the

programmable bits. The FIFO stores the AAOC data and the ADC results to simplify signal

reconstruction for algorithm developers. The programmed current values for the LEDs are

used for all five measurements. The assignment of the photodiodes is also fixed for all 5

measurements.

Figure 34: AAOC – simplified timing diagram

PPG

Sequencer

PPG

Sample

PPG

Sample

PPG

Sample

PPG Sample Period

Subsample

PPG Sub-Samples

Photodiode ENABLE

LED ENABLE

LED ON

SAR Algorithm Active

SAR STATUS

ADC DATA

SAR

DATA

PD Offset Register

PPG Measurement DATA

fixed PD Offset

SAR

DATA

SAR

DATA

SAR

DATA

REG update

by SAR algo.

REG update

by SAR algo.

REG update

by SAR algo.

REG update

by SAR algo.

AAOC PPG Measurement

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