ECG Measurement AD8232 Pulse Electrocardiogram Kit Compatible with Duinofun Development BoardItem NO.: AD8232

ECG Measurement AD8232 Kit

Product Information:

AD8232 is an integrated front-end, which is applicable to signal conditioning of cardiac bioelectrical signals for heart rate monitoring

An integrated signal conditioning module for ECG and other bioelectricity measurement applications. The device is designed to extract, amplify and filter weak bioelectrical signals when there is noise generated by motion or remote electrical placement. This design makes it easy for power consumption ADC or embedded microcontroller to collect output signals.

The AD8232 uses a two-point high pass filter to eliminate motion artifacts and electric half cell potential. The filter is tightly coupled with the instrument amplifier structure, which can realize single-stage high gain and high pass filtering, thus saving space and cost.

The AD8232 uses an operational amplifier without use constraints to create a three-point low-pass filter, eliminating additional noise. Users can meet the needs of different types of applications by selecting the cut-off frequencies of all filters.

For the common mode suppression performance of system line frequency and other undesirable interference, the AD8232 has a built-in amplifier for the right side drive (RLD) and other driven lead applications.

The AD8232 includes a fast recovery function, which can reduce the long tail of the high pass filter. If the signal of the amplifier rail voltage changes suddenly (such as lead separation), the AD8232 will automatically adjust to a higher filter cut-off state. This function enables 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 electricity of the measurement object.

The rated temperature range of guaranteed performance is 0 ℃ to 70 ℃, and the operating temperature range is - 40 ℃ to+85 ℃.

Scope Of Application:

● Fitness and exercise heart rate monitoring

● Portable ECG

● Remote health monitoring

● Game peripherals

● Bioelectric signal acquisition

Pin Description:

1 HPDRIVE Qualcomm driver output. HPDRIVE shall be connected to capacitors in high pass filters. AD8232 drives this pin to keep HPSENSE at the same level as the reference voltage.

2+IN instrument amplifier positive input+ The IN is usually connected to the left arm (LA).

3 − IN instrument amplifier negative input. − IN is normally connected to the right arm (RA).

4 RLDFB right leg drive feedback input terminal. RLDFB is the feedback pin of the right leg drive circuit.

5 RLD right leg drive output terminal. The drive (usually the right leg) should be connected to the RLD pin.

6 SW quick recovery switch pin. This pin should be connected to the output of the second high pass filter.

7 OPAMP+operational amplifier in-phase input terminal.

8 Output terminal of REFOUT reference voltage buffer. The instrument amplifier output refers to this potential. REFOUT shall be used as a virtual ground at any point in the circuit where a reference signal is required.

9 OPAMP − Op amp inverting input.

10 Output terminal of OUT operational amplifier. This output terminal provides a fully conditioned heart rate signal. OUT can be connected to the input of ADC.

11 LOD − lead drops off the output end of the comparator. In the DC lead dropout detection mode, when the connection with − IN is disconnected, LOD − is in the high level state, otherwise it is in the low level state. In the AC lead dropout detection mode, LOD − is always in the low level state. Lead dropout comparator output terminal: In the DC lead dropout detection mode, when+IN is electrically disconnected, LOD+is in the high level state, otherwise it is in the low level state. In the AC lead dropout detection mode, when − IN or+IN is electrically disconnected, LOD+is in a high level state, and when both of the two are connected, it is in a low level state.

12 LOD+

13 SDN shutdown control input terminal. Drive SDN to low level to enter low power off mode.

14 AC/DC lead fall off mode control input terminal. For DC lead dropout mode, drive the AC/DC pin to low level. For AC lead dropout mode, drive the AC/DC pin to high level.

15 FR Fast recovery control input. Drive FR to high level to enable fast recovery mode; Otherwise, it shall be driven to low level.

16 GND power supply ground.

17+VS power supply pin.

18 REFIN reference voltage buffer input terminal. REFIN (high impedance input pin) can be used to set the level of the reference voltage buffer.

19 IAOUT instrument amplifier output pin.

20 High pass detection input of HPSENSE instrument amplifier. The HPSENSE shall be connected to the R and C nodes that set the transition frequency of the isolated circuit.

EP Bare pads. Exposed pads shall be connected to GND or remain disconnected.