Spoon scale is a small, high-precision scale that adopts a spoon shaped design, making it easy for users to directly pick up and weigh. It is a small and portable weighing device for kitchen baking, food preparation, coffee brewing and other scenarios. The core requirements are high-precision weighing in small volume, multi unit switching, and low power consumption with long battery life. A spoon scale solution developed based on SIC8F05388 bit CMOS microcontroller, relying on the chip's built-in 24 bit Delta Sigma ADC, LCD driver module, and low-power architecture, meets the accuracy requirements of 0.1g division value under 200g range, and is suitable for household and small commercial weighing needs.

The following is the functional design of the spoon scale:

Units: g, ml, Lb, oz;

Range: 200g, zeroing range upon startup: full range;

Division: 0.1g/0.1ml/0.01lb/0.1oz;

Lifting weight: 1g, overload weight: 220g;

Power on mode: Press the button to turn on or turn on the power;

Calibration method: 2-point calibration: 100g/200g;

Working voltage: 3.0V;

Power consumption: Without backlight, the operating current is less than 4mA; the average shutdown current is less than 3uA;

Shutdown time: Low voltage displays "Lo" for 4 seconds before shutting down; Automatically shut down within 10 ± 2 seconds after the heavy object stabilizes;

Low voltage detection: one or two point detection; The type of button is light touch.

The basic information of SIC8F0538 is as follows:

Memory: ROM 4Kx16, general-purpose RAM 256x8

Working voltage range: 2.5V~4.5V 16MHz, 2.0V~4.5V 8MHz

Working temperature range: -40 ℃~85 ℃

8-level stack buffer

A concise and practical instruction system (68 instructions)

Table lookup function, built-in WDT timer

Built in low-voltage detection circuit and built-in USART communication module

Interrupt source: 2 timed interrupts, RA/RB port level change interrupt, other peripheral interrupts

Timer: 8-bit Timer TIMER0, TIMER2

Built in 128 byte program EEPROM, can be repeatedly erased and written 100000 times

An oscillation method, internal RC oscillation: designed frequency of 8MHz/16MHz

Overall, the spoon scale solution based on SIC8F0538 fully utilizes the high integration advantage of the chip to achieve all functions of weighing acquisition, display driver, button interaction, and power management. The hardware is simple, the cost is controllable, and the accuracy and power consumption performance meet the product requirements. The scheme has strong scalability and can quickly adjust functional configurations according to market positioning, providing a cost-effective implementation path for the development of small weighing equipment.