AS7058 datasheet(47/199 Pages) AMSOSRAM

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AS7058

Functional description

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DS001077 • v2-00 • 2025-Sep-24

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7.7

ECG/BioZ ADC3

The third build in ADC of AS7058 is used to serve ECG, Bioimpedance and Galvanic Skin

Response (GSR) applications. The ECG and BioZ/GSR measurement pins are feed into the

corresponding measurement hardware like it is shown in Figure 40. The output signals of

these blocks are connected to a common multiplexer which can be configured via

ECG_IMUX_SEL2 register. Depending on what should be measured the multiplexer

configuration register has to be configured accordingly to address ECG or Bioimpedance

measurements. The multiplexer is then followed by a buffer whose gain can also be configured

via ECG_IMUX_GAIN register. Both registers, ECG_IMUX_SEL2 and ECG_IMUX_GAIN, are

also part of the subsample configuration as part of the ECG/BioZ sequencer described in

chapter 7.6.

Figure 40: ECG/BioZ ADC3 signal path

ECG_INP

ECG_INN

ECG_REF

ECG_LPF

ECG

GSR

BIOZ_I

BIOZ_Q

ECG_IMUX_GAIN

Buffer

TEMP

ECG_LEAD

MOD 3

Voltage Input

delta-sigma

BIOZ1

BIOZ2

BIOZ3

BIOZ4

ECG Circuitry and

Lead of Detection

BioZ and GSR Circuitry

ECGMOD_IMUX_SEL2<2:0>

AS7058 Datasheet(PDF) 47 Page - ams-OSRAM AG