Intelligent Scale PCBA Scheme Design - Fat Scale Main Control CSU18M92

Intelligent Scale PCBA Scheme Design - Fat Scale Main Control CSU18M92

Generally, electronic scales are used for weighing and have few other uses. However, new changes have emerged. A smart electronic body fat scale has been launched, which can not only measure the user's basic weight and body fat, but also calculate the user's body mass index, bone density, muscle mass, and body moisture through the built-in Bluetooth sensor connected to the client in the smartphone. This allows for a clear understanding of the user's health status and the need for calcium supplementation. Next, let's take a look at the chip introduction of the 4-electrode AC fat measurement intelligent scale solution:

Introduction to CSU18M9 Chip

CSU18M92 is an SOC that supports 4-electrode AC lipid measurement and high-precision human weighing. The chip includes a human impedance measurement module BIM, a 24bit Sigma Delta ADC, an 8K × 16 bit MTP program memory, a 128 byte EEPROM, and an 896 byte data memory.

High performance RISC CPU:

8-bit microcontroller MCU

Built in 8K x 16 bit disposable programmable memory (MTP ROM) and 128Bytes EEPROM

896 Byte Data Memory (SRAM)

Only 46 single word instructions

8th level storage stack

Simulation characteristics:

One input fully differential 24Bit Sigma Delta ADC with 1/64/128 gain selection.

10Bit SAR ADC with 6 external channels and 2 internal channels

4-electrode AC human impedance measurement (BIM) module

The output speed of ADC is 15.2Hz~3.9KHz

Internal charge pump

Equipped with a voltage regulator for sensors and modulators

Internally integrated programmable gain amplifier

Characteristics of dedicated microcontrollers: