A ECG detection requires electrodes to form a circuit across the heart in the human body, and the signal that can be measured during the acquisition of EEG signals is actually the potential difference, where the potential difference is the difference between the active electrode and the reference electrode, and in order to get the accurate values of these parameters, we need to use the least active electrode as the reference. In order to get the accurate values of these parameters, we need to use the least active electrode as the reference, of course, there is also an ECG signal without the reference electrode, which can be done by turning off the right leg driver in our program.

A In fact, it is an indicator for the amplifier, the input reference noise is the noise energy measured at a certain frequency bandwidth, the standard for medical devices is 10 microvolts. Under the condition of frequency 0~100Hz, gain Gain= 6, it is less than 2.5uV.

A RISC-V core, existing routines; memory part (storage is 256K flash, 64 ROM, 64 RAM); communication protocols, digital interfaces (IIS, UART, SPI, IIC, etc.); analog part (built-in crystal oscillator, real-time clock RTC, timer TIMER reason, watchdog WDT, pulse width modulation).

A Power consumption is related to the application, and the power consumption of our chip is composed of AFE analog front-end power consumption, MCU power consumption, and the power consumption of the LEDs of the PPG, which is not a fixed value.EPC001 chip in the system clock 4M, ECG, PPG module are all in the low-speed clock mode, the use of serial communication, real-time acquisition of waveforms, the power consumption of the ECG2.1mA / PPG 3.6mA, respectively.