AS7058 datasheet(45/199 Pages) AMSOSRAM

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AS7058

Functional description

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DS001077 • v2-00 • 2025-Sep-24

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7.6

ECG/BioZ sample structure

The ECG/BioZ sequencer supports two sequencers (Sequencer 1 and Sequencer 2) which

can run with two different sample periods. Sequencer 1 has the option to enable two sub-

samples which is typically used for bioimpedance measurements where in subsample 1 the

amplitude and in subsample 2 the phase is measured. Sequencer 2 supports only one

subsample which is called subsample 3 shown in Figure 39. This subsample can be used to

support AC lead off detection which would require a different sample rate than an ECG

measurement which can be assigned to Sequencer 1.

Figure 39: ECG/BioZ sample structure and configuration options

The sample frequency, which can be programmed, uses a 32 kHz clock as the base

frequency. An overview about the clock generation of the ECG/BioZ Sequencer is shown in

Figure 28. Typical ECG sampling frequencies and the necessary register configuration for the

clock dividers is shown in Table 10.

Sequenzer 1

Sequenzer 2

Subsample

ECG1 SINC Filter

Downsampler Setting

ECG2 SINC Filter

Downsampler Setting

Sub 1

Gain

Sub 2

Gain

Sub 3

Gain

Sub 1

Input MUX

Sub 2

Input MUX

Sub 3

Input MUX

ECG / BioZ

Sequencer

ECG/BioZ

Sample

SEQ2

SEQ1

SEQ1 Sample Period

ECG/BioZ

Sample

SEQ1

ECG/BioZ

Sample

SEQ2

SEQ1

ECG/BioZ

Sample

SEQ1

SEQ1 Sample Period

SEQ 2 Sample Period

Sample Structure and Configuration

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