Contact Thermometer SoC Solution
Contact Thermometer SoC Solution High-precision body temperature measurement with integrated R-F converter, LCD driver, and ultra-low power design for medical and home healthcare applications.
Solution Overview
Contact thermometers are essential medical devices for accurate body temperature measurement. Our cost-effective SoC solution integrates a high-precision R-F converter and NTC sensor interface to deliver precise readings (±0.1°C). Designed for portability, the chip supports ultra-low voltage (1.5V) operation and features built-in LCD drivers. By utilizing mature measurement algorithms and eliminating the need for external EEPROM, our solution significantly reduces BOM costs while ensuring fast, reliable performance for oral, axillary, and rectal thermometers.
Application Areas
- Digital oral/axillary thermometers
- High-precision clinical thermometers
- Baby thermometers
- Smart digital thermometers
Application Block Diagram
High-Res R-F Technology
16-bit Timer Resolution, ±0.1°C Accuracy.
Ultra-Low Power Design
Extremely low standby current, extends battery life.
Highly Integrated SoC
Built-in LCD driver, minimizes external BOM.
Core Features & Benefits
High-Precision R-F Technology
Replaces traditional ADC with proprietary R-F (Resistance-to-Frequency) technology. By using a high-resolution 16-bit timer to measure NTC oscillation frequency, it achieves medical-grade accuracy of ±0.1°C (32°C~42°C) without the cost of high-bit ADCs. (R-F Resistance measurement, 16-bit timers.)
ltra-Low Voltage Operation
Optimized for single 1.5V battery applications. The BH67F2132 operates efficiently on a voltage range of 1.1V~2.2V, allowing the use of a standard single-cell battery (LR41/SR41), significantly extending battery life for portable thermometers. (1.5V battery for BH67F2132, 1.1V ~ 2.2V.)
Lowest BOM Cost
Eliminates the need for external EEPROM. Calibration data is stored directly in the MCU’s internal memory. Combined with the built-in LCD driver and buzzer interface.
Fast Measurement
Optimized measurement algorithm achieves 8-10 second reading time for oral measurement, 60 seconds for axillary measurement.
Mature & Production-Ready
Complete algorithm library and reference designs. We provide field-proven algorithms for temperature calculation, prediction, and calibration. The solution includes support for standard thermostatic water bath calibration, ensuring rapid mass production setup.
Flexible Product Options
Available in Flash and OTP versions. Choose BH67F2132 (Flash) for 1.5V applications with re-programmability, or BH67R2136 (OTP) for the most cost-sensitive projects requiring 3.0V operation or LED backlighting. (BH67F2132 / BH67R2136 distinction, LED Backlight.)
Recommended MCU Products
Select the optimal chip model based on your product requirements
BH67F2132
RECOMMENDEDUltra-Low Voltage R to F LCD Flash MCU
📊 Key Specifications
✨ Features
- Optimized for Single-Cell Battery
- Lowest BOM Cost Integration
- Medical-Grade Precision
- Mass Production Ready
BH67R2136
RECOMMENDEDR to F LCD OTP MCU
📊 Key Specifications
✨ Features
- Broad Voltage Range (LED Support)
- Cost-Effective OTP Solution
- High-Precision Measurement
- Production-Ready
Development Support & Resources
Comprehensive development resources to accelerate your time-to-market
Reference Design
Complete contact thermometer reference design with schematics and PCB.
SDK & Drivers
SDK & Drivers Thermistor drivers, temperature calculation, and sample code.
Algorithm Library
Temperature calculation, calibration, and prediction algorithms.
Development Tools
Programmer/debugger and configuration tools.
Technical Documentation
Datasheets, application notes, and thermometer design guidelines.
Training & Webinars
Contact thermometer design training and webinars.
Need More Technical Support?
Our technical team is ready to provide professional consultation and customized solutions
Frequently Asked Questions
What sensor types are supported?
Our solution is optimized for NTC thermistors (typically 50kΩ or 10kΩ). It utilizes a proprietary R-F (Resistance-to-Frequency) converter interface instead of a traditional ADC, ensuring high-precision measurement with NTC sensors specifically for body temperature applications.
How many temperature readings can be stored?
The BH67F2132 (Flash version) includes 128 bytes of data EEPROM, which can be programmed to store the last measurement reading or calibration data. The BH67R2136 (OTP version) is a cost-optimized solution designed for basic measurement without historical memory storage.
What is the typical measurement time?
Typical stabilization time is roughly 30-60 seconds for accurate oral measurement. However, our MCU supports advanced prediction algorithms that can significantly reduce the effective readout time depending on the software configuration.
Does the solution meet medical device standards?
Yes, the solution provides ±0.1°C accuracy within the 32°C~42°C range, meeting the performance requirements for clinical thermometers