Weigh Scale / Body Composition Analog Front End (PCB only)Designed by Ilya Mordasov in Russia
What is it? This is 2 layered PCB designed a special for AFE4300. The AFE4300 is a low-cost analog front-end incorporating two separate signal chains: one chain for weight-scale (WS) measurement an...Read More…
This is 2 layered PCB designed a special for AFE4300.
The AFE4300 is a low-cost analog front-end incorporating two separate signal chains: one chain for weight-scale (WS) measurement and the other for body composition measurement (BCM) analysis. A 16-bit, 860-SPS analog-to-digital converter (ADC) is multiplexed between both chains. The weight measurement chain includes an instrumentation amplifier (INA) with the gain set by an external resistor, followed by a 6-bit digital-to-analog converter (DAC) for offset correction, and a circuit to drive the external bridge/load cell with a fixed 1.7 V for ratiometric measurements.
The AFE4300 can also measure body composition by applying a sinusoidal current into the body. The sinusoidal current is generated with an internal pattern generator and a 6-bit, 1-MSPS DAC. A voltage-to-current converter applies this sinusoidal current into the body, between two terminals. The voltage created across these two terminals as a result of the impedance of the body is measured back with a differential amplifier, rectified, and the amplitude is extracted and measured by the 16-bit ADC.
The AFE4300 operates from 2 V to 3.6 V, is specified from 0°C to +70°C, and is available in a LQFP-80 package.
I made this board to start measuring body composition. My manufacturer made 5 more boards, 1 I used and have 4 more for sell.
With help BOM list (comes with board) you can make a dev board for measuring body weight and composition. The board has pin jumpers to set this board up according to your purpose. TI gives a detailed data sheet how to configure and use it.
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