HJXY AD8232 ECG physiological measurement pulse heart monitoring sensor module for Arduino | Компьютеры и офис

HJXY AD8232 ECG physiological measurement pulse heart monitoring sensor module for Arduino | Компьютеры и офис

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Product description

AD8232 sensor module Single lead heart rate monitoring front end AD8232 is an integrated front-end, suitable for signaling heart bioelectric signals No. conditioning for heart rate monitoring. An integrated signal conditioning module for ECG and other bioelectric measurement applications. The device is designed to extract, amplify and filter weak bioelectrical signals with noise generated by motion or remote electrode placement. This design enables ultra-low power analog-to-digital converters (ADCs) or embedded microcontrollers to easily acquire output signals. The AD8232 uses a two-pole high-pass filter to eliminate motion artifacts and electrode half-cell potential. The filter is tightly coupled with the instrumentation amplifier structure, which can achieve single-stage high gain and high-pass filtering, thereby saving space and cost. The AD8232 uses an unused operational amplifier to create a three-pole low-pass filter, eliminating the extra noise. Users can meet the needs of different types of applications by selecting the cutoff frequencies of all filters. In order to improve the common-mode rejection performance of the system line frequency and other undesirable interference, the AD8232 contains an amplifier for use in driven lead applications such as right-side drive (RLD). The AD8232 includes a fast recovery function to reduce the long-tailed long-tail phenomenon of high-pass filters. If there is a sudden signal change in the amplifier rail voltage (such as lead detachment), the AD8232 will automatically adjust to a higher filter cut-off state. This function allows the AD8232 to achieve rapid recovery, so that effective measurement values ​​can be obtained as soon as possible after the lead is connected to the electrode of the measurement object. The rated temperature range for guaranteed performance is 0 ℃ to 70 ℃, and the operating temperature range is -40 ℃ to +85 ℃. application Fitness and exercise heart rate monitoring Portable ECG Remote health monitoring Game peripherals Bioelectric signal acquisition Pin number Pin name Description 1 HPDRIVE Qualcomm driver output. HPDRIVE should be connected to the capacitor in the first high-pass filter. AD8232 drives this pin to keep HPSENSE and the reference voltage at the same level. 2 + IN Positive input of instrumentation amplifier. + IN is usually connected to the left arm (LA) electrode. 3 −IN Instrument amplifier negative input. −IN is usually connected to the right arm (RA) electrode. 4 RLDFB right leg drive feedback input. RLDFB is the feedback pin of the right leg drive circuit. 5 RLD right leg drive output. The drive electrode (usually the right leg) should be connected to the RLD pin. 6 SW Fast recovery switch pin. This pin should be connected to the output of the second high-pass filter. 7 OPAMP + Operational amplifier non-inverting input. 8 REFOUT Reference voltage buffer output. The instrumentation amplifier output refers to this potential. REFOUT should be used as a virtual ground at any point in the circuit that requires a reference signal. 9 OPAMP− Op amp inverting input. 10 OUT Operational amplifier output. This output provides a fully conditioned heart rate signal. OUT can be connected to the input of the ADC. 11 LOD− Lead off comparator output. In DC lead off detection mode, when disconnected from the −IN electrode, LOD− is in a high state, otherwise it is in a low state. In AC lead off detection mode, LOD− is always low. Lead off comparator output. In DC lead off detection mode, when the + IN electrode is disconnected, LOD + is in a high state, Otherwise, it is in a low state. In AC lead off detection mode, when the −IN or + IN electrode is disconnected, LOD + is in a high state, When both electrodes are connected, it is in a low state. 12 LOD + 13 SDN shutdown control input. Drive SDN to low level to enter low-power shutdown mode. 14 AC / DC lead off mode control input. For DC lead off mode, the AC / DC pin should be driven low. For AC lead off mode, the AC / DC pin should be driven high. 15 FR fast recovery control input. Drive FR high to enable fast recovery mode; otherwise, it should be driven low. 16 GND Power ground. 17 + VS Power pin. 18 REFIN Reference voltage buffer input. REFIN (high impedance input pin) can be used to set the level of the reference voltage buffer. 19 IAOUT Instrumentation amplifier output pin. 20 HPSENSE instrument amplifier high pass detection input. HPSENSE should be connected to the R and C nodes that set the corner frequency of the DC blocking circuit. EP Exposed pad. The exposed pad should be connected to GND or left unconnected.