Product introduction

Csu18m92 is a SoC that supports 4-electrode AC fat measurement and high-precision body weighing. The chip includes body impedance measurement module BIM, 24bit sigma delta ADC, 8K × 16 bit MTP program memory, 128 byte EEPROM and 896 byte data memory.
High performance RISC CPU
8-bit MCU
Built in 8K × 16 bit disposable programmable memory (MTP ROM) and 128bytes EEPROM
896 byte data memory (SRAM)
There are only 46 single word instructions
Level 8 storage stack
Simulation characteristics
One input fully differential 24bit sigma delta ADC with 1 / 64 / 128 times gain selection.
10bit SAR ADC with 6 external channels and 2 internal channels
4-electrode AC body impedance measurement (BIM) module
The output rate of ADC is 15.2hz ~ 3.9khz
Internal charge pump
Internal voltage regulator for sensor and modulator
Internally integrated programmable gain amplifier
Characteristics of special microcontroller
Power on reset (POR)
Power on reset delay timer (39ms)
Internal low voltage reset (LVR)
Timer 0
-Programmable prescaled 8-bit timer
Timer / counter 1 / 2 / 3
-Programmable prescaled 8-bit timer / counter
Peripheral features
31 bit bi-directional I / O port, part of which pt2.1 ~ pt2.4, pT3 *, pT4 * are reused as LCD / LED port
13 input ports with wake-up function
2-way UART, baud rate up to 115200bps
1 channel I2C slave, support standard mode (100k bit / s) and fast mode (400k bit / s)
1 channel SPI, maximum communication rate 500KHz
One buzzer output, current capacity 6mA
Support 4 × 24, 6 * 22 LCD driver or 4 * 14 LED driver
Low voltage comparison function (LVD), can be used for power supply voltage comparison and external voltage comparison
Built in temperature sensor
With RTC function, year, month, day, week, hour, minute and second information
Application
Body fat scale