SBAT016 October   2023 AFE4500

 

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The measurement of bioimpedance enables applications like Body Composition Measurement and Electrodermal Analysis. Body Composition Measurement (BCM) using Bioimpedance Analysis (BIA) refers to the estimation of various components that make up the body composition (water, muscle, fat, and so forth) by measuring the electrical impedance between one or more segments of the human body, usually at 50 kHz. The challenges of realizing a BCM application on a wearable device arise from high and time-varying contact impedances. The TI AFE4500 device solves these challenges with a unique approach to impedance measurement that adapts dynamically to time-varying contact impedance while measuring the body impedance accurately. Electrodermal Analysis (EDA) refers to the variation of the electrical conductance of the skin in response to sweat secretion and is linked to mental states like stress, emotion, and cognitive states. TI's AFE4500 has two signal chains for EDA measurement, one that enables EDA monitoring with high accuracy, and the other that enables EDA monitoring at extremely low power.

GUID-20230925-SS0I-VDW9-77C1-LNWHC8BFQWCZ-low.svgBody Composition Monitoring
GUID-20230925-SS0I-Q5T9-Z0GC-GPD4RPMFCRV6-low.svgEDA Monitoring

Recommended Parts

Part Number Description
AFE4500 Integrated analog front end (AFE) for bioimpedance analysis and electrical and optical biosensing

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