Master chip csu18m92 develops intelligent scale scheme

　　 The pace of human life is fast 、 Irregular diet and other current situations have caused many people to gain weight , Obesity is known to cause “ Three tenors ” problem , To lose weight 、 Weight loss has become a major health topic of great concern . People who want to do good things must first sharpen their tools , If you want to lose weight, you should also have a good partner , Intelligent scales that can measure weight and body fat at the same time have gradually become the mainstream .

　　 Its most basic function is intelligent scale ：

　　1、 Weight measurement ： stand up 1~3 Seconds later , The scale can accurately display the weight ;

　　2、 Measure the body fat rate ： Stand barefoot on the scale , You can analyze the body fat ratio through your feet , The scale will automatically store the recorded information , Fast analysis BMI( Body mass index );

　　3、 Connect your phone wirelessly APP： Synchronize weight and body mass index to APP/ Cloud database, etc ; Besides , You can also turn on the alarm function , The scale will automatically remind you to weigh , After completing the weight , The alarm clock will stop automatically .

　　 Main control chip used in intelligent weighing scale CSU18M92

　　CSU18M92 It's a support 4 Electrode AC grease measurement 、 High precision human body weighing SOC. The chip contains human impedance measurement module BIM、24bit Sigma-Delta ADC、8K×16 position MTP Program memory 、128 byte EEPROM and 896 Byte data memory .

　　 High performance RISC CPU:

　　8 Bit MCU MCU

　　 built-in 8K×16 Bit disposable programmable memory （MTP ROM） and 128Bytes EEPROM

　　896 Byte data memory （SRAM）

　　 Only 46 A single word instruction

　　8 Level storage stack

　　 Simulation characteristics :

　　1 Path input full differential 24Bit Sigma-Delta type ADC,1/64/128 Multiple gain selection .

　　6 Road external access and 2 Internal passage of road 10Bit SAR ADC

　　4 Electrode AC human impedance measurement （BIM) modular

　　ADC The output rate of 15.2Hz~3.9KHz

　　 Internal charge pump

　　 The built-in voltage regulator is used for sensors and modulators

　　 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

　　 timing / Counter 123

　　- Programmable prescaled 8 Bit timing / Counter

　　 Peripheral features :

　　31 Bit bidirectional I/O mouth , Part of it PT2.1~PT2.4、PT3*、PT4* Reuse as LCD/LED mouth

　　13 An input port with wake-up function

　　2 road UART, The highest baud rate support 115200bps

　　1 road I2C Slave , Support standard mode （100K bit/s) And fast mode （400K bit/s)

　　1 road SPI, Maximum communication rate 500KHz

　　1 Circuit buzzer output , Current capacity 6mA

　　 Support 4×24、6*22 Of LCD Drive or 4*14 LED drive

　　 Low voltage comparison function （LVD), It can be used for power supply voltage comparison and external voltage comparison

　　 Built in temperature sensor

　　 have RTC function , year 、 month 、 Japan 、 week 、 Hours 、 branch 、 Second information