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AS7058 Datasheet(PDF) 51 Page - ams-OSRAM AG

Part # AS7058
Description  IC for PPG, ECG and body impedance measurement
PDF  199 Pages
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Manufacturer  AMSOSRAM [ams-OSRAM AG]
Direct Link  https://ams-osram.com/
Logo AMSOSRAM - ams-OSRAM AG

AS7058 Datasheet(HTML) 51 Page - ams-OSRAM AG

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AS7058
Functional description
Datasheet • PUBLIC • Document Feedback
DS001077 • v2-00 • 2025-Sep-24
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7.7.2
BioZ/GSR measurement system
Bioelectrical impedance analysis is a method of assessing body composition, such as body fat,
fluid levels, and tissue mass. A small AC current is applied, which flows through the body, and
the voltage is measured so the bioimpedance can be calculated. The bioimpedance channel
consists of an input MUX, a capacitive-coupled amplifier, I/Q demodulation mixers, two anti-
aliasing filters, a pseudo-sine current DAC, and an internal reference resistor that is used to
calibrate the errors in the signal path and used as a measuring scale. A simplified system
block diagram of the BioZ/GSR measurement system is shown in Figure 44.
Figure 44: BioZ/GSR block diagram
The included MUX can freely combine the BIOZ1 pin to BIOZ4, as well as the input and output
of the current DAC and the BioZ amplifier. The selection can be set with BIOZ_SELECT (see
chapter 8.1 Register overview).
Two different modes can be chosen:
•
Body impedance measurement (BioZ)
•
Galvanic skin response (GSR)/Electro Dermal Activity (EDA)
AS7058
short
2 k
1 k
0.5 k
1 M
I
Q
0° /90°
clk
BIOZ4
BIOZ2
BIOZ1
BIOZ3
ECG_LPF
ECG
GSR
BIOZ_I
BIOZ_Q
ECG_IMUX_GAIN
Buffer
TEMP
ECG_LEAD
MOD 3
Current input
delta-sigma
ECGMOD_IMUX_SEL2<2:0>
BIOZ_SELECT<6:0>
IDAC
Current DAC
10 µA - 100 µA
1 kHz – MHz
BIOZ_EXCIT_CURR<2:0>
BIOZ_EXCIT_FREQ_SEL<3:0>
BIOZ_GAIN



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