HCT Blood Glucose Meter  Reference Design

Paired with a complicated evaluation platform, this resolution integrates superior analog front-end circuits, seamless knowledge processing, and strong calibration capabilities. 

The HCT (Hematocrit) blood glucose meter is a precision machine that employs an electrochemical methodology to measure DC present, AC impedance, and part angle produced through the response between blood and a reactive enzyme. These measurements are utilized to calculate the precise blood glucose focus. The meter features in tandem with an evaluation platform (AP), which facilitates calibration and testing. The AP instantly communicates with the microcontroller unit (MCU) to provoke calibration and carry out varied measurement fashions. As soon as testing is accomplished, the MCU uploads the measured knowledge to the AP, which processes the information to compute impedance and part angle values for show. The outcomes will also be exported into Excel for additional evaluation. The system delivers excessive accuracy, with a part angle measurement error of ±0.3° and impedance measurement error of ±1%.

The design WAS-199CEN by Holtek integrates superior options for strong and environment friendly operation. An Analog Entrance-Finish (AFE) circuit ensures correct and steady measurements with minimal exterior elements. The AFE features a extremely correct voltage supply with low-temperature drift, a DAC (Digital-to-Analog Converter), and operational amplifiers. This integration permits exact DC present measurement with only some resistors and capacitors. Moreover, the HCT AFE circuit helps multi-frequency, high-accuracy AC impedance and part angle measurements with out requiring exterior elements. The hematocrit stage is derived from these measurements, including one other layer of performance.

The answer includes two important elements: the HCT blood glucose meter improvement board with check strips and the BH67F2485 AC Impedance & Electrochemical Measurement Evaluation Platform (AP). The event board performs steady sampling and calculates DC present, AC impedance, and part angle utilizing electrochemical ideas. These values are then adjusted utilizing HCT compensation to find out the blood glucose focus. The outcomes are transmitted through a UART communication interface, guaranteeing seamless knowledge trade. Key specs of the event board embody a BH67F2485 MCU (80LQFP package deal), working voltage vary of two.2V to five.5V, impedance measurement vary of 5kΩ–40kΩ (adjustable for particular necessities), and measurement accuracy of ±0.3° for part angle and ±1% for impedance. The UART interface operates at 38400 baud charge with 8 knowledge bits, no parity, and 1 cease bit.

The evaluation platform (AP) enhances the event board by commanding the MCU to regulate inside reference voltages and the 12-bit DAC output voltage. This platform ensures exact calibration and testing, enabling dependable operation and seamless integration with the event board for a complete measurement resolution.

Holtek checks it, together with system block diagrams, schematics, and PCB design recordsdata. This ensures customers have entry to all crucial sources for implementing, evaluating, and customising the answer. It encompasses a strong energy system based mostly on high-performance elements, guaranteeing reliability and effectivity.

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