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AS7058 Datasheet(PDF) 49 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) 49 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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The multiplexer can be configured via register ECGMOD_IMUX_SEL2 register by selecting
ECG input instead of ECG_LPF setting.
7.7.1.1
Lead off detection
The ECG Lead Off circuit is a differential current source intended to apply a stimulus for lead
off detection to the ECG inputs. A simplified block diagram is depicted in Figure 42 below. The
square waved stimulus current can be configured via register ECGAMP_LEADOFF_CURR
register. The lead off clock which controls the lead off transistors is linked to the ECG/PPG
Sequencer and half the sequencer clock frequency. With each clock cycle of the sequencer
the polarity of the lead off current is changing resulting in a stimulus signal which is half the
frequency of the ECG/PPG Sequencer clock.
Figure 42: ECG lead off detection block diagram
ECG_INP
ECG_INN
ECG_REF
Preamplifier
INA1
ECGAMP_INA1_GAIN
ECG_IMUX_GAIN
Buffer
MOD 3
Current input
delta-sigma
Digital
Comparator
ECGMOD_IMUX_SEL2<2:0>
LEADOFF_TH_RES<16:0>
ECGP_LEAD
ECGN_LEAD
Lead Off
Control
ECGAMP_LEADOFF_CURR<6:0>
LEADOFF_EDGE<1:0>
LEADOFF_OVS<2:0>
LEADOFF_EN



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