AS7038RB datasheet(92/127 Pages) AMSOSRAM

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AS7038RB

Functional Description

Datasheet

• PUBLIC

DS000726

• v2-00 • 2021-Jun-02

126

│ 91

ECG Lead OFF Detection

Figure 121:

ECG Lead-OFF Detection

The ECG lead OFF detection can be used for detection if the user actually touches the leads. It is a

circuitry to measure the capacitor and/or resistance between the two lead inputs ECG_INP and

ECG_INN.

ECG_INP

ECG_REF

2x10M

GND

ecg_leadsdet_curr

20nA/100nA/500nA/1µA

to ADC

channel ecgi

ecg_leadsdet_en

ecg_leadsdet_sync_adc

If ecg_leaddet_sync_adc is set, the leads

detect current is reversed by toggling

ecg_leadset_pol on every start of a

sequencer period, where an ADC conversion

of ECG_INP is performed.

This concept allows the measurement of the

connected resistor and capacitor between the

electrodes.

ecg_leadsdet_pol

updates

ecg_leadsdet_sync_adc=1

IECG_INP

VECG_INP

sequencer

start period

ADC

convert

start

ADC

convert

start

ADC

convert

seq_adc

ecg_low_leakage_en

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