Main control and display part

Efm32tg840 integrates 8 & times; The 20 Segment LCD driver can directly drive the LCD screen of ultrasonic heat meter, and the power consumption is only 550na. The LCD driver of efm32tg840 has integrated voltage boost function and contrast adjustment function, which can realize the VCMP voltage comparator in the chip to monitor VDD voltage, and turn on LCD boost and contrast adjustment by grades, so as to achieve good LCD effect, even if the system battery voltage drops with the increase of service time.

  Design of ultra low power ultrasonic heat meter circuit module based on gp21 + efm32

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