Holtek has introduced the BH67F5362A and BH67F5372A, a new generation of 24-bit A/D LCD Flash microcontrollers featuring high-performance Delta-Sigma A/D conversion. These MCUs are specifically designed for high-precision measurement applications, such as electronic scales, blood pressure monitors, thermometers, and industrial instruments.

High-Resolution and High-Speed Measurement Capability

The BH67F5362A/BH67F5372A integrate a 24-bit Delta-Sigma A/D converter with a maximum conversion rate of 1.6 kHz, delivering excellent resolution and stability for precision sensing applications. The devices also include an additional 12-bit A/D converter operating up to 125 kHz, enabling fast signal acquisition for dynamic measurements and system monitoring.

With an effective number of bits (ENOB) up to 19.5 bits, these MCUs provide outstanding accuracy, making them well suited for metering and medical-grade measurement products.

Integrated LCD Driver and Rich Peripheral Resources

Both MCUs feature a built-in LCD driver, capable of directly driving LCD panels in multiple configurations (36×4, 34×6, or 32×8), significantly reducing external component count and system cost.

To support diverse system designs, the devices integrate multiple communication interfaces, including UART, SPI, and I²C, along with a comprehensive set of timers and real-time clock (RTC) functionality.

Memory Options for Scalable Designs

   *  BH67F5362A

          *  16K × 16 Flash program memory

          *  2048 × 8 RAM

          *  1024 × 8 EEPROM

   *  BH67F5372A

          *  32K × 16 Flash program memory

          *  3072 × 8 RAM

   *  2048 × 8 EEPROM

Both devices support In-Application Programming (IAP) and include a hardware MDU, allowing flexible firmware updates and efficient arithmetic processing.

Electrical Characteristics and Packaging

Operating from 1.8 V to 5.5 V with a maximum clock frequency of 16 MHz, the BH67F5362A/BH67F5372A provide excellent compatibility across battery-powered and mains-powered systems.

They are offered in a 64-pin LQFP package, providing up to 45 I/O pins, and enabling easy integration into mid- to high-end measurement products.

Target Applications

    *  Electronic weighing scales

    *  Blood pressure monitors

    *  Digital thermometers

    *  Smart meters

    *  Industrial and consumer measurement instruments

    *  LCD-based sensing and display systems