Specifications:
1. One lead to a heart rate monitor
2. AD8232 is an integrated front, Applicable to the heart of a biological electrical signal to carry a letter
3. The amount of conditioning to exercise heart rate monitoring.
4. Ensure performance Nominal temperature range from 0 to 70 degrees C, Operating temperature range from -40 to +85.
5. i.c. Compatibility

works on the principle:
1. Integrated signal module for ECG and other bio electrical measurement applications. The device is designed for extract, amplification and filtering for weak biological electrical signals in the case of noise by moving or remote placement electrode. The design allows an ultra low power analog-to-digital converter (ADC) or a built-in microcontroller to easily capture the output signal.
2. AD8232 Bipolar Point HF Filter to eliminate Motion artifacts and electrode half cell potential. The filter is closely related to the instrument's amplifier structure, which can realize single-stage high gain and high-pass filter, thus saving space and cost.
3. The AD8232 uses a non-operational amplifier to create three-pole low-pass filters, eliminating additional noise. Users can meet the needs of different types of applications by selecting the cutoff frequency of all filters.
In order to improve the system frequency circuit and other unwanted interference in-phase failure performance, the AD8232 is assembled into an amplifier for the right-hand driver (rld) and other lead-driven applications.
4. The AD8232 contains a fast recovery function, you can reduce the long high-pass filter to establish a long tail phenomenon. If the amplifier has a signal voltage mutation (such as pull out the case), the AD8232 will automatically adjust to a more slice filter state. This feature allows the AD8232 to achieve rapid recovery And thus, a lead connection to the measurement object can be achieved as soon as possible after measuring the value.

Application
Fitness and exercise heart rate monitoring
Portable ECG
remote health monitoring
games of peripheral devices
Bio electric signal acquisition

Pin number pin Name Description
1 hpdrive high frequency driver output. The capacitor must be connected to the first high pass filter in hpdrive.
The AD8232 driver this output keep hpsense at the same reference voltage level.
2 + in the instrument amplifiers positive input. + in is normally connected to the left arm (La) of the electrode.
3-in Instrumentation amplifiers negative input. In the normally connected to the right hand (ra) electrode.
4 rldfb right foot driver feedback input. rldfb is the right leg driver feedback loop pin.
5 rld right foot driver output. disk electrodes (usually on the right foot) should be connected to the rld pin.
6 SW fast recovery switch pin. This output must be connected to the output of the second high-pass filter.
7 operational amplifier + op-inverting input.
8 refout reference voltage Output buffer. The output amplifier tool refers to this potential.
The refout should be used as a virtual ground for any point in the channel that requires a reference signal.
9-operational amplifier inverting input.
10 of the output of the op-amp. this output provides a fully conditioned heart rate signal.
Out; can be connected to the input side of the ADC.
11 Lod-lead the output end of the comparator. Autumn detection mode in DC lead, and when the electrode is off,
Lode-in high state, otherwise it's low. In the Exchange folder, the detection mode is assigned, the Lode is always in a low state.
lead the output of the comparator. In DC, the detection mode is activated when + is turned off in the electrode, In Lode + in high level,
On the contrary, it is in a low state. In the Exchange folder, the detection mode is set aside, and when in or + to the electrode is disabled, Lode + is in high state,
When these two electrodes are connected, they are in a low state.
12 Lod +
13 sdn control off input. sdn at a low level, which can be turned on in low power off mode.
14 AC / DC lead mode to disable input control. For DC to cause the shutdown mode, ac / dc output should be drive low.
for AC lead reset mode, ac / dc output must be the drive at the highest level.
15 FR quick recovery input control. FR high-level disk can be Quick Recovery mode; otherwise, This should be the drive at a low level.
16 GND power supply.
17 + VS power supply pin.
18 refin the reference input voltage of the input buffer. refin (high resistance of input contacts) can be used to set the level of the reference voltage of the buffers.
Instrumentation amplifiers output contact.
20 hpsense Instrumentation amplifiers for high-frequency detection input.
hpsense is connected to r and C nodes to