AS7058 datasheet(32/199 Pages) AMSOSRAM

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AS7058

Functional description

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Figure 29: PPG sample structure and configuration options

The second parameter which applies to all enabled subsamples are the settings for the SINC

decimation filter and oversampling settings for ADC1 and ADC2 which can be configured in

PPG_SINC_DEC, PPG_SINC_OVS and PPG_SEL_ORDER. In addition to the oversampling

and LED current settings the LED assignment (LED_SUBx) as well as the measurement mode

(PPG_MODE_x) for each subsample is a setting which is used for both ADC channels like it is

shown in Figure 29. In order to maintain best dynamic range and noise behavior it is also

important that the current range for ADC1 and ADC2 is configured accordingly. The current

range configuration for each ADC applies also to all subsamples in a PGG measurement and

can be configured with registers PPGMOD1_IOS_FS and PPGMOD2_IOS_FS.

PPG

Sequencer

PPG

Sample

PPG

Sample

PPG

Sample

PPG Sample Period

Subsample

LED input channel 1 – current settings

PPG ADC 1 and ADC 2 SINC Filter Downsampler Setting

SUB 1 LED

Selection

SUB 2 LED

Selection

SUB 3 LED

Selection

SUB 4 LED

Selection

SUB 5 LED

Selection

SUB 6 LED

Selection

SUB 7 LED

Selection

SUB 8 LED

Selection

PPG ADC 1 current range

SUB 1

MOD 1 PD

Selection

SUB 2

MOD 1 PD

Selection

SUB 3

MOD 1 PD

Selection

SUB 4

MOD 1 PD

Selection

SUB 5

MOD 1 PD

Selection

SUB 6

MOD 1 PD

Selection

SUB 7

MOD 1 PD

Selection

SUB 8

MOD 1 PD

Selection

SUB 1

MOD 1

DAC Offset

SUB 2

MOD 1

DAC Offset

SUB 3

MOD 1

DAC Offset

SUB 4

MOD 1

DAC Offset

SUB 5

MOD 1

DAC Offset

SUB 6

MOD 1

DAC Offset

SUB 7

MOD 1

DAC Offset

SUB 8

MOD 1

DAC Offset

PPG ADC 2 current range

SUB 1

MOD 2 PD

Selection

SUB 2

MOD 2 PD

Selection

SUB 3

MOD 2 PD

Selection

SUB 4

MOD 2 PD

Selection

SUB 5

MOD 2 PD

Selection

SUB 6

MOD 2 PD

Selection

SUB 7

MOD 2 PD

Selection

SUB 8

MOD 2 PD

Selection

SUB 1

MOD 2

DAC Offset

SUB 2

MOD 2

DAC Offset

SUB 3

MOD 2

DAC Offset

SUB 4

MOD 2

DAC Offset

SUB 5

MOD 2

DAC Offset

SUB 6

MOD 2

DAC Offset

SUB 7

MOD 2

DAC Offset

SUB 8

MOD 2

DAC Offset

PPG Sample Structure and Configuration

SUB 1

M. Mode

SUB 2

M. Mode

SUB 3

M. Mode

SUB 4

M. Mode

SUB 5

M. Mode

SUB 6

M. Mode

SUB 7

M. Mode

SUB 8

M. Mode

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