MCU Products

The device is a Flash Memory 8-bit high performance RISC architecture microcontroller which includes a BIA (Bio-Impedance Analysis) module and a multi-channel 24-bit Delta Sigma A/D converter, designed for applications that interface directly to analog signals and which require a low noise and high accuracy analog-to-digital converter, such as weight and fat measurement applications.

For memory features, the Flash Memory offers users the convenience of multi-programming features. Other memory includes an area of RAM Data Memory as well as an area of true EEPROM memory for storage of non-volatile data such as serial numbers, calibration data etc.

Analog features include a multi-channel 24-bit Delta Sigma A/D converter and Bio-Impedance Analysis circuitry. Multiple and extremely flexible Timer Modules provide timing, pulse generation and PWM generation functions. Communication with the outside world is catered for by including fully integrated SPI, I2C and UART interface functions, some popular interfaces which provide designers with a means of easy communication with external peripheral hardware. Protective features such as an internal Watchdog Timer, Low Voltage Reset and Low Voltage Detector coupled with excellent noise immunity and ESD protection ensure that reliable operation is maintained in hostile electrical environments.

A full choice of external, internal and high and low oscillators functions are provided including two fully integrated system oscillators which require no external components for their implementation. The ability to operate and switch dynamically between a range of operating modes using different clock sources gives users the ability to optimise microcontroller operation and minimise power consumption.

Measuring bio-impedance uses a technique whereby an AC current flowing through the human body is measured and then used to calculate a bio-impedance value. The specialised circuits to do this are a weight measurement circuit and a fat measurement circuit. The weight measurement circuit uses an external load cell to output a signal, which is amplified by an operational amplifier and then converted using an A/D converter. The converted value is the calculated weight. Regarding the fat measurement, an AC signal flows through human body via an electrode slice, this signal is amplified by an internal operational amplifier and then converted by the A/D converter. The converted value will be used to calculate the corresponding bio-impedance value.

The inclusion of flexible I/O programming features, a 16-bit MDU, Time-Base functions along with many other features ensure that the device will be highly capable of providing MCU solutions for Bio-impedance measurement applications.