Turnkey Infrared Thermometer SoC Solution
This turnkey solution provides a high-precision MCU platform for rapid, non-contact body temperature measurements, making it ideal for portable forehead and ear thermometers used in medical fever screening and home healthcare.
Solution Overview
We provide a comprehensive, medical-grade thermometer solution powered by the Holtek BH67F52xx series. This highly integrated SoC combines a 24-bit Delta-Sigma ADC, LCD driver, LDO, PGA, and Low Noise OPA, significantly reducing external components and BOM costs while supporting versatile Forehead and Ear measurement modes. Beyond the silicon, we solve the toughest challenge in thermometer manufacturing: Calibration. Our turnkey support accelerates your time-to-market with: Complete Reference Design: Production-ready schematics, PCB layouts. Mass Production Calibration: Step-by-step guidance for setting up Constant Temperature Rooms (25°C) and high-stability Water Baths (±0.02°C). Automated Workflow: Proven algorithms for 2-point calibration (30°C & 45°C) and 3-point verification (30°C, 37°C, 45°C), ensuring every unit strictly meets the ±0.2°C accuracy standard before leaving the factory.
Application Areas
- Forehead thermometers
- Ear thermometers
- Fever screening devices
- Industrial temperature measurement
Application Block Diagram
Medical-Grade Precision
Built-in OPA & 24-bit ADC ensure ±0.2°C accuracy directly from the thermopile.
Ultra-Low Power
Integrated LDO enables ≤ 5 μA standby current on standard 2×AAA batteries.
High Integration SoC
Single chip drives LCD, Backlight, and Voice, minimizing BOM cost and design complexity.
Core Features & Benefits
High-Precision Non-Contact Measurement
Achieve ±0.2°C Accuracy The 24-bit ADC combined with a built-in Low Noise OPA (Operational Amplifier) ensures high-precision signal acquisition, meeting medical accuracy standards of ±0.2°C (35°C~42°C).
Ultra-Low Power Design
Extended Battery Life System static current ≤ 5 μA and dynamic measurement current ≤ 20 mA. Optimized for 2×AAA (1.5V) batteries to support long-term usage.
High Integration SoC
Reduced BOM Cost Integrates LDO, PGA, Low Noise OPA, LCD driver, and IR sensor interface into a single chip. This high integration significantly reduces external component count and PCB size.
Fast & Smart Measurement
1-Second Instant Reading Completes measurement in 1 second with 0.1°C resolution. The versatile design supports both Forehead and Ear temperature measurement modes, making it suitable for various clinical needs.
Production-Ready Algorithms library
Turnkey Calibration Support Includes mature algorithms for ambient temperature compensation and thermistor/NTC non-linearity correction. We provide complete calibration workflows for mass production.
Mass Production Support
Simplified Certification We provide guidelines for Constant Temperature Room and Blackbody setup to ensure every unit passes strict accuracy tests (30°C/37°C/45°C checkpoints) during manufacturing.
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Development Support & Resources
Comprehensive development resources to accelerate your time-to-market
Reference Design
Complete infrared thermometer reference design with schematics and PCB.
SDK & Drivers
IR sensor drivers, temperature calculation, and sample code.
Algorithm Library
Temperature conversion, ambient compensation, and emissivity correction algorithms.
Development Tools
Programmer/debugger and configuration tools.
Technical Documentation
Datasheets, application notes, and IR thermometer design guidelines.
Training & Webinars
Infrared thermometer design training and webinars.
Need More Technical Support?
Our technical team is ready to provide professional consultation and customized solutions
Frequently Asked Questions
Does the solution meet medical device standards?
Yes, our MCU is designed to support ASTM E1965 and ISO 80601-2-56 standards for infrared thermometers, with ±0.2°C accuracy for forehead measurement.
What is the typical measurement distance?
Typical measurement distance is 3-5cm for forehead thermometers. Our solution includes distance detection to ensure proper positioning for accurate readings.
How is ambient temperature compensation implemented?
Our MCU includes an integrated ambient temperature sensor. The algorithm library provides compensation formulas to correct IR sensor readings based on ambient temperature.
Can the thermometer measure both forehead and ear temperature?
Yes, with appropriate IR sensor selection and algorithm calibration, our solution can support both forehead and ear measurement modes with mode switching.
How many temperature readings can be stored?
Our high-end MCU (BH66F2662) supports memory recall for the last 32 readings. The mid-range MCU (BH66F2652) supports the last 10 readings.
What battery life can be achieved?
With ultra-low sleep current (<1.5μA) and optimized power management, 2×AAA batteries can support 3000+ measurements, or approximately 2-3 years of typical use.