The Kynix Components

Product OverviewThe Atmel® ATmega1284 is a low-power CMOS 8-bit microcontroller based on the AVR® enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega1284 achieves throughputs close to 1MIPS per MHz. This empowers system designer to optimize the device for power consumption versus processing speed. This blog will introduce ATmega1284 systematically from its features, pinout to its specifications, applications, also including ATMEGA1284 VS ATmega1284P and so much more. Catalog Product OverviewProgramming ATMEGA1284 Using Arduino LibrariesATMEGA1284 PinoutATMEGA1284 FeaturesATMEGA1284 Block DiagramATMEGA1284 SpecificationATMEGA1284 VS ATmega1284PATMEGA1284 ManufacturerATMEGA1284 DatasheetUsing WarningsATMEGA1284 FAQ Programming ATMEGA1284 Using Arduino Libraries Programming ATMEGA644 or 1284 using arduino libraries in Atmel Studio 7 ATMEGA1284 PinoutThe following figure is the diagram of ATmega1284 pinout. ATmega1284 Pinout ATMEGA1284 FeaturesHigh Performance, Low Power Atmel®AVR® 8-Bit Microcontroller FamilyAdvanced RISC Architecture– 131 Powerful Instructions– Most Single Clock Cycle Execution– 32 x 8 General Purpose Working Registers– Fully Static Operation– Up to 20 MIPS Throughput at 20MHz– On-chip 2-cycle MultiplierHigh Endurance Non-volatile Memory Segments– 128KBytes of In-System Self-Programmable Flash ProgramMemory– 4KBytes EEPROM– 16KBytes Internal SRAM– Write/Erase Cycles: 10,000 Flash/100,000 EEPROM– Data Retention: 20 Years at 85°C/100 Years at 25°C(1)– Optional Boot Code Section with Independent Lock BitsIn-System Programming by On-chip Boot ProgramTrue Read-While-Write Operation– Programming Lock for Software SecurityAtmel QTouch® Library Support– Capacitive Touch Buttons, Sliders and Wheels– QTouch and QMatrix acquisition– Up to 64 Sense ChannelsJTAG (IEEE std. 1149.1 Compliant) Interface– Boundary-scan Capabilities According to the JTAG Standard– Extensive On-chip Debug Support– Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG InterfacePeripheral Features– Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode– Two 16-bit Timer/Counters with Separate Prescaler, Compare Mode, and Capture Mode– Real Time Counter with Separate Oscillator– Eight PWM Channels– 8-channel 10-bit ADCDifferential Mode with Selectable Gain at 1×, 10× or 200×– One Byte-oriented 2-wire Serial Interface (Philips I2C compatible)– Two Programmable Serial USART– One Master/Slave SPI Serial Interface– Programmable Watchdog Timer with Separate On-chip Oscillator– On-chip Analog Comparator– Interrupt and Wake-up on Pin ChangeSpecial Microcontroller Features– Power-on Reset and Programmable Brown-out Detection– Internal Calibrated RC Oscillator– External and Internal Interrupt Sources– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, andExtended StandbyI/O and Packages– 32 Programmable I/O Lines– 40-pin PDIP– 44-lead TQFP– 44-pad VQFN/QFNOperating Voltage:– 1.8 - 5.5VSpeed Grades– 0 - 4MHz @ 1.8V - 5.5V– 0 - 10MHz @ 2.7V - 5.5V– 0 - 20MHz @ 4.5 - 5.5VPower Consumption at 1MHz, 1.8V, 25°C– Active Mode: 0.4mA– Power-down Mode: 0.1μA– Power-save Mode: 0.6μA (Including 32kHz RTC) ATMEGA1284 Block DiagramThe following figure shows the block diagram of ATMEGA1284 ATMEGA1284 Block Diagram ATMEGA1284 SpecificationMax ADC Resolution (bits)10Program Memory Size (KB)128Capture/Compare/PWM (CCP)1Number of Comparators1CPU Speed (MIPS/DMIPS)20Data EEPROM (bytes)4096DigitalTimerQty_16bit2Max 8 Bit Digital Timers2EthernetNoneI2C1Program Memory TypeFlashmtrlcntrlinputcapture1ADC Channels8Low PowerNoOperating Voltage1.8 - 5.5outputcomparatorPWM6Pin Count44SPI3Temp Range (°C)-125USART2 ATMEGA1284 VS ATmega1284P ATMEGA1284ATmega1284PDigitalTimerQty_16bit22Max 8 Bit Digital Timers22EthernetNoneNoneI2C11Program Memory TypeFlashFlashmtrlcntrlinputcapture11ADC Channels88Low PowerNoYesOperating Voltage1.8 - 5.51.8 - 5.5outputcomparatorPWM66Pin Count4444SPI33Temp Range (°C)-125-125USART102 ATMEGA1284 ManufacturerMicrochip Technology Incorporated is a leading provider of smart, connected and secure embedded control solutions. Its easy-to-use development tools and comprehensive product portfolio enable customers to create optimal designs, which reduce risk while lowering total system cost and time to market. The company's solutions serve more than 120,000 customers across the industrial, automotive, consumer, aerospace and defense, communications and computing markets. Microchip offers outstanding technical support along with dependable delivery and quality. ATMEGA1284 DatasheetYou can download this datasheet for ATMEGA1284–Datasheet from the link given below:ATMEGA1284 Datasheet Using WarningsNote: Please check their parameters and pin configuration before replacing them in your circuit. ATMEGA1284 FAQWhat kind of microcontroller is ATMEGA1284P based on?The ATmega1284P is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega1284P achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. How does noise reduction mode work in ATmega128?The ADC Noise Reduction mode plays a vital role in minimizing the switching noise and freezes entire module except asynchronous ADC and Timers. In the Power-save mode, the entire device is sleeping except asynchronous timer which continues to run. Which is better ATmega2560 or atmega1284?The ATmega1284 is a desirable chip to work with: it provides a generous 128 Kbytes of flash memory, 4 Kbytes of EEPROM, and 16 Kbytes RAM, twice as much RAM as the ATmega2560. It also has the advantage that it's available in a DIP package, so it fits on a prototyping board and is easy to wire up, and is nearly half the price of the ATmega2560. How to upload a program on an atmega1284?Select the ATmega1284 @ 1 MHz (internal oscillator; BOD disabled) option on the Boards menu which is the default fuse setting on new ATmega1284s. Then upload the program using the Tiny AVR Programmer Board (see ATtiny-Based Beginner's Kit ): Connecting the Tiny AVR Programmer Board to an ATmega1284 for ISP programming. Which is the default fuse setting on atmega1284?Here's a Blink program for use with the empty core, using an LED connected via a 220Ω resistor to digital I/O pin PD5 (pin 19): Select the ATmega1284 @ 1 MHz (internal oscillator; BOD disabled) option on the Boards menu which is the default fuse setting on new ATmega1284s.

Product OverviewThe LM3900 series consists of four independent, dual input, internally compensated amplifiers which were designed specifically to operate off of a single power supply voltage and to provide a large output voltage swing. These amplifiers make use of a current mirror to achieve the non-inverting input function. Application areas include ac amplifiers,  RC  active filters, low-frequency triangle, square wave, and pulse waveform generation circuits, tachometers, and low speed, high voltage digital logic gates. This blog will introduce LM3900 systematically from its features, pinout to its specifications, applications, also including LM3900 datasheet and so much more. Synthchaser #107 - Homemade LM3900 Norton Op Amp Tester CatalogProduct OverviewLM3900 FeaturesLM3900 PinoutLM3900 Pin ConfigurationLM3900 ApplicationsLM3900 Circuit DiagramLM3900 Schematic and Connection DiagramsHow the 4-channel Audio Mixer WorksSpecification of LM3900 VS LM2900LM3900 DatasheetLM3900 ManufacturerUsing WarningsLM3900 FAQ LM3900 FeaturesWide single supply voltage  4 VDC to 32 VDCRange or dual supplies g2 VDC to g16 VDCSupply current drain independent of supply voltage  Low input biasing current 30 nAHigh open-loop gain  70 dBWide bandwidth 2.5 MHz (unity gain)Large output voltage swing (Va b 1) Vp-pInternally frequency compensated for unity gain  Output short-circuit protection LM3900 PinoutThe following figure is the diagram of the LM3900 pinout. LM3900 Pinout LM3900 Pin ConfigurationPin NoPin NameDescription1NON-INV-IN 1Non-Inverting Input 12NON-INV-IN 2Non-Inverting Input 23INV-IN 2Inverting Input 24OUT 2Output Pin 25OUT 1Output Pin 16INV-IN 1Inverting Input 17GNDGround Pin8INV-IN 3Inverting Input 39OUT 3Output Pin 310OUT 4Output Pin 411INV-IN 4Inverting Input 412NON-INV-IN 4Non-Inverting Input 413NON-INV-IN 3Non-Inverting Input 314V+Positive Supply Voltage LM3900 ApplicationsAC amplifiersRC active filtersLow-frequency triangleSquare wavePulse waveform generation circuitsTachometersLow speedHigh voltageDigital logic gates LM3900 Circuit DiagramFollowing is the circuit diagram of LM3900. LM3900 Circuit Diagram  LM3900 Schematic and Connection DiagramsThe architecture and pin configuration of LM3900 is shown in the picture below. LM3900 Schematic and Connection Diagrams How the 4-channel Audio Mixer WorksThe amplification (gain) of each channel is controlled with 1 potentiometer. Four channels means that we will use 4 potentiometers (P1, P2, P3, P4), placed at the inverting input of each amplifier. Each potentiometer controls the audio level of each channel before amplifying the signal and performing the audio mix. The potentiometers are used to control the volume of the input signals. The outputs of the 4 channels are mixed after passing through 4 resistors of the same value (R11, R12, R13, R14) All operational amplifiers are configured as inverting amplifiers and have decoupling capacitors at their inputs and outputs. These capacitors filter (block) the direct current component of the signals at the input and output, amplifying only the alternating signal (the audio signal). Specification of LM3900 VS LM2900keyLM3900LM2900Number of Channels (#)44Total Supply Voltage (Min) (+5V=5, +/-5V=10)4.54.5Total Supply Voltage (Max) (+5V=5, +/-5V=10)3232GBW (Typ) (MHz)2.52.5Slew Rate (Typ) (V/us)2020Rail-to-RailNoNoIq per channel (Typ) (mA)1.551.3RatingCatalogCatalogOperating Temperature Range (C)0 to 70-40 to 85Package GroupSOIC PDIPPDIP SOICApprox. Price (US$)0.08 | 1ku0.09 | 1kuPackage Size: mm2:W x L (PKG)See datasheet (PDIP)See datasheet (PDIP)Additional FeaturesN/AN/AInput Bias Current (Max) (pA)200000200000Output Current (Typ) (mA)105ArchitectureBipolarBipolar LM3900 DatasheetYou can download this datasheet for LM3900 Quad Amplifier – Datasheet from the link given below: LM3900 Datasheet LM3900 ManufacturerTexas Instruments Incorporated (TI) is a global semiconductor design and manufacturing company that develops analog ICs and embedded processors. By employing the world's brightest minds, TI creates innovations that shape the future of technology. TI is helping more than 100,000 customers transform the future, today. Using WarningsNote: Please check their parameters and pin configuration before replacing them in your circuit. LM3900 FAQ① What are the cool things about the LM3900?One of the cool things about the LM3900 is that the input voltage can exceed the supply rails without a lot of fancy stuff. Thus you could look for the presence of line to speaker levels very easily and even filter the hiss. That's what a specific timer of mine does. ② How many channels does a lm3900 audio mixer have?The circuit has two channels for microphone inputs and two channels for inputs of other devices. If you want a mixer with more input channels, you can duplicate this circuit and get a mixer with up to 8 channels. The LM3900 operational amplifiers have the following characteristics: High amplitude output voltage. ③ Can a lm3900 op amp be replaced?The LM3900 was a very different kind of op amp. It operates on the difference in input current rather than the difference in input voltages. It can not be replaced with a LM324 op amp. From what I read, the NTE992 is a replacement. ④ What do LM3900 amplifiers use to achieve the non-inverting input function?Current mirror ⑤ What type of filter is used in the LM3900 series?RC active filters

Overview of INA226Video related to INA226INA226 PinoutINA226 Pinout DescriptionINA226 Absolute Maximum RatingsINA226 Block DiagramINA226 FeaturesINA226 Input FilteringINA226 Circuit ConfigurationINA226 ApplicationsINA226 VS INA230Arduino with INA226 moduleINA226 Packaging informationINA226 FAQ  Overview of INA226A current shunt and power monitor with an interface that is compatible with I2CTM or SMBUS is called the INA226. The tool keeps track of the bus supply voltage as well as a shunt voltage drop. Direct readouts of current in amperes and power in watts are made possible by the combination of an internal multiplier, programmable calibration value, conversion timings, and averaging. Independent of the supply voltage, the INA226 measures current on common-mode bus voltages that range from 0 V to 36 V. The gadget requires a single source that ranges in voltage from 2.7 to 5.5 volts to function, typically requiring 330 A. The device has an operational temperature range of -40°C to 125°C and an I2C-compatible interface with up to 16 programmable addresses. Video related to INA226 INA226 PinoutFigure 1: INA226 Pinout INA226 Pinout DescriptionPIN NAMEPIN NO.I/ODESCRIPTIONA02Digital inputAddress pin. Connect to GND, SCL, SDA, or VS. Table 2 shows pin settings and corresponding addresses.A11Digital inputAddress pin. Connect to GND, SCL, SDA, or VS. Table 2 shows pin settings and corresponding addresses.Alert3Digital outputMulti-functional alert, open-drain output.GND7AnalogGround.IN+10Analog inputConnect to the supply side of the shunt resistor.IN–9Analog inputConnect to the load side of the shunt resistor.SCL5Digital inputSerial bus clock line, open-drain input.SDA4Digital I/OSerial bus data line, open-drain input/output.VBUS8Analog inputBus voltage input.VS6AnalogPower supply, 2.7 V to 5.5 V. INA226 Absolute Maximum Ratings  MINMAXUNITVVSSupply voltage 6VAnalog Inputs, IN+, IN–Differential (VIN+ – VIN-)(2)–4040VCommon-Mode (VIN+ + VIN-) / 2–0.340  VVBUS –0.340VVSDA GND – 0.36VVSCL GND – 0.3VVS + 0.3VIINInput current into any pin 5mAIOUTOpen-drain digital output current 10mATJJunction temperature 150°CTstgStorage temperature range–65150°C INA226 Block DiagramFigure 2: INA226 Block Diagram INA226 FeaturesSenses Bus Voltages From 0 V to 36 VPin, DGS (VSSOP) PackageOperates from 2.7-V to 5.5-V Power SupplyConfigurable Averaging Options16 Programmable AddressesReports Current, Voltage, and PowerHigh-Side or Low-Side Sensing INA226 Input FilteringThe inbuilt ADC is built on a delta-sigma () front-end with a typical sampling rate of 500 kHz (30%). Although the noise rejection of this architecture is generally good, transients that occur at or very near the harmonics of the sampling rate can be problematic. Since these signals are at 1 MHz and above, they can be controlled by adding filtering to the device's input. Due to the high frequency, there are minimal implications on measurement accuracy when using low-value series resistors on the filter. In general, only transients at precise harmonics of the 500 kHz (30%) sampling rate necessitate filtering the device input. Use a ceramic capacitor and the smallest series resistance (usually 10 or less) to filter.The recommended range for this capacitor is 0.1 to 1 F. The device with a filter added at the input is shown in Figure 3.Figure 3: INA226 Input Filtering INA226 Circuit ConfigurationThe schematics below illustrate an example of an INA226 application circuit diagram. Two measurements are made on the relevant power-supply bus by the INA226 device. A shunt voltage is created by the load current flowing through a shunt resistor and is monitored at the IN+ and IN- pins. By connecting the power supply bus voltage to the VBUS pin, the device may also measure that voltage. The bus voltage is measured with respect to the ground, whereas the differential shunt voltage is measured with regard to the IN-pin. The standard power source for the gadget ranges in voltage from 2.7 V to 5.5 V. Based on the fixed 1.25 mV LSB for the Bus Voltage Register, which produces a full-scale value of 40.96 V, the bus being monitored can have a voltage range of 0 V to 36 V.Figure 4: INA226 Circuit Configuration  INA226 ApplicationsServersTelecom equipmentComputingPower managementBattery chargersPower suppliesTest equipment INA226 VS INA230 INA226 Datasheet INA230 Datasheet Common mode voltage (Max) ( V )3636FeaturesAlert Function Bi-directional Low-side Capable Ultra preciseAlert Function Bi-directional Low-side CapableDigital interfaceI2C SMBusI2C SMBusResolution ( Bits )1616Package GroupVSSOP | 10VQFN | 16 VSSOP | 10Common mode voltage (Min) ( V )00TI.com inventorylock Log in to view inventorylock Log in to view inventoryInput offset (+/-) (Max) ( uV )1025Input offset drift (+/-) (Typ) ( uV/C )0.020.05Gain ( V/V )11Gain error ( % )0.10.3Gain error drift (+/-) (Max) ( ppm/°C )5050CMRR (Min) ( dB )126120Bandwidth ( kHz )3.53.5Supply voltage (Max) ( V )5.55.5Supply voltage (Min) ( V )2.72.7Iq (Max) ( mA )0.420.42Comparing the Electrical Characteristics Tables in section 6.5 of both datasheets will reveal the differences in performance/accuracy (specification). The main distinction is that the INA233's thresholds are fixed, allowing it to operate with 1.8V logic and still be powered by 5-V Vs, whereas the INA226's thresholds are with respect to the supply voltage (Vs).Comparing INA226 VS INA230 from both datasheets will reveal the variations in register maps. The fundamental distinction between the two gadgets is this. The INA233 is controlled by PMBUS codes, whereas the INA226 is controlled by I2C/SMBus. Arduino with INA226 moduleYou may build a very precise instrument that can track the electricity used by a DC-powered gadget using the robust INA226 chip and an Arduino board. The current, voltage, and power readings are kept on a micro SD card and presented on an LCD display.This monitoring tool could be used for a variety of things, including battery-powered scooters, pedal-assist bicycles, photovoltaic panels, etc.For the INA226 chip, there are a few libraries available. I used the Korneliusz Jarzebski library, which looks to be rather comprehensive, however I had to change a few functions because they produced incorrect results.Figure 5: Arduino with INA226 module Schematic INA226 Packaging informationFigure 6: INA226 Tape & Reel INA226 FAQWhat is INA226?A 16-bit resolution current and power monitor chip with a high-accuracy ADC is called the INA226. It monitors both shunt voltage drop and bus voltage drop and has interfaces that are I2C and SMBUS compatible for simple integration. Direct readout of current in amperes and power in watts is possible thanks to programmable calibration value, conversion timings, and averaging, as well as an internal multiplier. What is the use of current sensor?A current sensor is a device that detects current and converts it into an output voltage that is simple to measure and proportional to the current flowing through the path being measured. There are many different types of sensors, and each one is appropriate for a particular current range and environmental circumstance. INA226 VS INA230The variations in performance/accuracy can be seen by contrasting the Electrical Characteristics Tables in section 6.5 of both datasheets. The key difference is that the INA233's thresholds are fixed, allowing it to run at 1.8 volts of logic while still drawing 5 volts of power, as opposed to the INA226's thresholds, which are dependent on the supply voltage. How do you wire an INA219?Connect V+ to the power supply's positive terminal for the circuit you're testing. Join V- to the load's positive terminal or lead. The sense resistor is now in line with the circuit as a result. Last but not least, attach a wire to GND from the negative terminal of the power supply. What is INA219?A current shunt and power monitor with an I2C or SMBUS compatible interface is the INA219 device. The device has adjustable conversion times and filtering, and it monitors both shunt voltage drop and bus supply voltage.

I. IntroductionThe heart rate is a key indicator value reflecting the health of the body. Simply put, the heart rate refers to the frequency of cardiovascular beats within 1 minute. The test of heart rate can show scientific evidence in work such as disease diagnosis, patient care, and athlete training. In recent years, many medical types of equipment and fitness equipment developed and manufactured by countries around the world have adopted heart rate test power circuits. The low cost of product development and high-performance heart rate test power circuits have important application values. The article introduces this kind of heartbeat rate detection system based on AD620 integrated IC in detail. Using the excellent low-noise characteristics of AD620 integrated IC, plus effective filtering and amplifying circuits, combined with microprocessor solutions, a high-precision heart rate monitoring system is obtained.Figure 1 AD620CatalogI. IntroductionII. AD620 ChipIII. Circuit Design3.1 Block Diagram3.2 Signal Extraction Circuit Based on AD6203.3 Filter Amplifier Circuit3.4 Microprocessor Circuit3.5 Experimental Results and DiscussionIV. ConclusionFAQOrdering & Quantity II.AD620 chip AD620 is a low-cost, high-precision instrumentation amplifier. It only needs an external resistor to set the gain, and the gain range is 1 to 10000. In addition, AD620 adopts 8-pin SOIC and DIP package, the size is smaller than the discrete circuit design, and the power consumption is lower, so it is very suitable for battery-powered and portable applications. Its characteristics are as follows: EASY TO USE　　Gain Set with One External Resistor　　(Gain Range 1 to 10,000)　　Wide Power Supply Range (±2.3 V to ±18 V)　　Higher Performance than Three　　Op Amp IA Designs　　Available in 8-Lead DIP and SOIC Packaging　　Low Power, 1.3 mA max SupplyLOW NOISE　　9 nV/√Hz, @ 1 kHz, Input Voltage Noise　　0.28 µV p-p Noise (0.1 Hz to 10 Hz)EXCELLENT DC PERFORMANCE (B GRADE)　　50 µV max, Input Offset Voltage　　0.6 µV/°C max, Input Offset Drift　　1.0 nA max, Input Bias Current　　100 dB min Common-Mode　　Rejection Ratio (G = 10)EXCELLENT AC SPECIFICATIONS　　120 kHz Bandwidth (G = 100)        15 µs Settling Time to 0.01% III. Circuit Design 3.1 Block Diagram The surface of the human skin contains human ECG,  EMG, and power frequency signals. Generally, the noise of the ECG  signal containing heart rate information is much smaller than that of the power frequency signal. In order to extract the weak ECG  signal, a low-noise operational amplifier must be used and a reasonable filter amplifier circuit must be designed. Figure 2 is a block diagram of the heart rate detection system. The whole heart rate detection system consists of four parts: the sensor head in contact with the human skin surface, the signal extraction circuit, the filter amplifier circuit, and the microprocessor circuit. The sensor head is generally a metal that is easy to conduct electricity. After contacting the surface of the human skin, it has complex electrical signals such as human ECG  signals, electromyographic signals, and power frequency signals. We use the low-noise AD620 operational amplifier as the core chip of the heartbeat rate extraction circuit. In the filtering and amplifying circuit part, a simple low-pass filtering circuit is used. The experimental results show that this filtering circuit is sufficient to extract the heart rate signal. After filtering the amplified signal, an adjustable comparator combined with a transistor circuit is used to form a 5 volt TTL level signal, and finally connected to the microprocessor, the heartbeat signal is processed by the microcomputer, and the heartbeat rate is calculated and displayed.Figure 2 Block diagram of heart rate detection principle 3.2 Signal Extraction Circuit Based on AD620 AD620 operational amplifier, usually used in high-precision test instruments, the maximum nonlinear error of 40ppm, the maximum voltage offset of 50uV, the maximum temperature drift of 0.6uV/℃, because of its low noise, low bias current, low power consumption characteristics, it is widely used in medical fields such as electrocardiogram (ECG) and blood pressure monitoring. Figure 3 is a signal extraction circuit based on AD620, in which the LEFT_ARM, RIGHT_ARM, LEG three leads are connected to the aluminum sheet (ie the sensor head), which are respectively connected to the left and right hands and right feet of the human body. Our experimental research results show that the R4 gain of LEFT_ARM is 1K, the corresponding AD620 operational amplifier gain is 50. Too much gain will weaken the final signal-to-noise ratio, so the R4 resistance value should be set reasonably in the experiment. The 0.1uF capacitance between the LEFT_ARM and RIGHT_ARM leads is to effectively weaken the power frequency noise. The LEG lead is connected to AD620 through TL082A, which provides the reference potential of the human body for the differential signal of LEFT_ARM and RIGHT_ARM.Figure 3 Signal extraction circuit based on AD620 3.3 Filter Amplifier Circuit Figure 4 is a filter amplifier circuit. Three operational amplifiers constitute a three-stage amplification, each amplifying 100 times. Due to circuit loss, especially the loss of the isolation capacitor, the actual signal amplification is less than 1 million times. The ratio of the resistance values of R6 and R5, R9 and R8, R11 and R10 in the circuit determines the magnification factor, and these resistance values should be adjusted reasonably in practical applications. A low-pass filter circuit should be used while amplifying the signal to achieve the effect of filtering power frequency noise. Since the frequency of the power frequency noise is 50Hz, the designed filter circuit has a passband bandwidth of less than 50Hz, that is, the RC time constant of the capacitor resistor must be of the same order of magnitude as the power frequency signal period. R7 and C10 in the circuit form a low-pass filter. We use 1uF capacitor isolation between levels of amplification. These capacitors will attenuate the signal at the same time, and the three operational amplifiers are selected for signal amplification, so the signal-to-noise ratio is improved. It should be pointed out that if the isolation capacitor is too large, it is easy to cause the output electrical signal to drift.Figure 4 Filter amplifier circuit Figure 5 is the shaping circuit. The heartbeat rate signal and signal-to-noise ratio of the 2ND_OUT lead are large enough (the pulse rate of the heartbeat rate is 1 ~ 5V), after the half-wave shaping of D1, then the adjustable comparator, and finally the transistor Q1 is converted to the microcontroller level.Figure 5 Shaping circuit 3.4 Microprocessor Circuit The final signal is processed by AT89C51, and the heart rate is displayed by an LED digital tube. The microprocessor circuit with AT89C51 as the core is very mature, so it's no need to repeat it here. 3.5 Experimental Results and Discussion Figure 6 shows the actual measurement results of the human heart rate using the above system. Figure 6(a) is the voltage signal after the signal 2ND_OUT is shaped by D1. It can be seen from the figure that this is actually a complete ECG  signal. In a cycle of signals, there are two more obvious pulse signals. This pulse characteristic varies from person to person. It is found that there is at least one pulse signal through actual measurement of the ECG  signals of different people. Figure 6(b) shows the electrical signal of  HEART_PULSE, which is obtained after the signal of Figure 6(a) passes through the comparator and the transistor switch. The signal can be directly input to the port of the microprocessor, and the microprocessor calculates and outputs the heart rate.Figure 6 Heart rate signal diagram When developing the above-mentioned heart rate detection system, there are several key points to pay special attention to: (1) Connecting capacitors to LEFT_ARM and RIGHT_ARM can greatly improve the signal-to-noise ratio; the main energy of the heart rate signal on LEFT_ARM and RIGHT_ARM is at a frequency of about 1 Hz, and the capacitor is a low-pass filter that can filter and suppress noise; Choose a large capacitor to eliminate high-frequency noise. In the experiment, a 10uF non-polar capacitor is used, and the effect is very good; (2) The low-pass filter circuit effectively weakens the power frequency signal and improves the signal-to-noise ratio; it adopts a combination of active filtering and passive filtering to filter while amplifying, which has a better effect than filtering after amplification; (3) Capacitor isolation attenuation and multi-stage amplification are beneficial to improve the signal-to-noise ratio; the main noise is 50Hz power frequency signals. Although the multi-stage amplification and filtering increase thermal noise, it has great suppression of power frequency noise. Of course, the number of amplification stages cannot be infinite, and the best number of stages is the minimum sum of power frequency noise and thermal noise; (4) Small capacitor isolation should be used to suppress DC signal drift. This is shown by the experimental results, and the reason needs to be further studied. IV. Conclusion This article discusses a scheme based on AD620 chip heart rate detection and introduces the circuit design of the sensor head, signal extraction, filter amplification, and microprocessor that make up the system. Gives the method to improve the system performance. Experiments show that the system can obtain better ECG signals and accurate heart rates. The heartbeat rate detection system in this article has strong anti-interference ability, simple structure, and low cost.FAQWhat is obtained using the low-noise characteristics of AD620 integrated IC?High-precision heart rate monitoring systemWhat package does AD620 adopt?8-pin SOIC and DIPWhat type of test instruments are AD620 operational amplifier usually used?High-precision test instrumentsWhat is AD620?AD620 is a low-cost, high-precision instrumentation amplifier. It only requires an external resistor to set the gain. The gain range is 1 to 10,000.Can I change AD620 to AD623 when making MCU products?Both AD620 and AD623 are single instrumentation amplifiers, and the pin arrangement is exactly the same.The main difference is: AD620 must use positive and negative power supplies, AD623 can be a positive and negative power supply or a single power supply.If the original board is AD620, you can replace it with 623; if the original board is AD623, you may not be able to replace it with 620 (it depends on whether the power supply of the original board circuit is dual power supply or single power supply).After replacing AD620 and AD623 in single-chip products, the program can work normally without modification.What is the difference between AD620BR and AD620AN?Their packages are different.What is the output resistance of AD620? How to adjust it?AD620 is a kind of low power consumption instrument amplifier, its output resistance is about 10K, this is the inherent characteristic of this chip, generally it is difficult to adjust.If you have requirements for output resistance, you can generally use an external circuit to solve it.Is AD620 a positive phase amplification or a reverse phase amplification?AD620 is an instrument amplifier, the output voltage is [(Vin+)-(Vin-)]*gain.If the desired signal is (Vin+)-(Vin-), the gain is positive, which is equivalent to positive amplification.Conversely, if the desired signal is (Vin-)-(Vin+), the gain is equivalent to negative, which is equivalent to reverse amplification.What is an instrumentation amplifier?Instrumentation amplifier, an improvement of the differential amplifier, has an input buffer, does not require input impedance matching, so that the amplifier is suitable for measurement and electronic instruments

The KSP2222A is a bipolar NPN transistor.KSP2222A is an NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at the ground and will be closed (Forward biased) when a signal is provided to the base pin. KSP2222A has a gain value of 100 to 300, this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 600mA, hence we cannot connect loads that consume more than 600mA using this transistor. To bias a transistor we have to supply current to the base pin, this current (IB) should be limited to 5mA.This blog provides you with a basic overview of the KSP2222A transistor, including its pin descriptions, functions and specifications, alternative products, etc., to help you quickly understand what KSP2222A is.We will be glad to find that this blog can be useful for people loving electronic components.CatalogKSP2222A PinoutKSP2222A FeaturesKSP2222A AdvantageKSP2222A PacakgeWhere to use KSP2222A TransistorHow to use KSP2222A TransistorKSP2222A EquivalentKSP2222A SMD VersionKSP2222A Replacement & EquivalentKSP2222A AlternativeKSP2222A ApplicationComponent DatasheetFAQKSP2222A PinoutThe KSP2222A is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, base, and collector leads.Here is an image showing the pin diagram of this transistor.Pin NumberPin NameDescription1EmitterCurrent Drains out through emitter2BaseControls the biasing of transistor3CollectorCurrent flows in through collectorThe KSP2907A is a complementary PNP transistor for the KSP2222A.KSP2222A FeaturesType - NPNCollector-Emitter Voltage: 40 VCollector-Base Voltage: 75 VEmitter-Base Voltage: 6 VCollector Current: 0.6 ACollector Dissipation: 0.625 WDC Current Gain (hfe) : 100 to 300Transition Frequency: 300 MHzNoise Figure: 4 dBOperating and Storage Junction Temperature Range: -55 to +150 °CPackage:  TO-92 Electrically Similar to the Popular  2N2222A  transistor.KSP2222A AdvantageKSP2222A NPN TransistorKSP2222A is an NPN transistor, so the collector and emitter will be left open (Reverse bias) when the base pin is held on the ground and closed (Forward bias) when the base pin is signaled. KSP2222A has a gain value of 100 to 300, which is determined by the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 600mA, so it is not possible to connect loads that consume more than 600mA using this transistor. This current (IB) should be limited to 5mA in order to bias the transistor that we have to supply current to the base pin.When this transistor is fully biased, it can allow a maximum of 600mA to flow through the collector and the emitter. This stage is called the Saturation Region and the typical voltage allowed over the Collector-Emitter (V¬CE) or Base-Emitter (VBE) could be 40V and 600mV respectively. When the base current is removed, the transistor is completely disconnected, this stage is called the Cut-off Region.KSP2222A Pacakge3-Lead, TO-92, Molded, 0.2 in Line Spacing Lead Form, Ammo, Tape and Reel Type3-Lead, TO-92, JEDEC TO-92 Compliant Straight Lead Configuration, Bulk TypeWhere to use KSP2222A TransistorThe KSP2222A transistor is very similar to the commonly used BC547 NPN transistor. But there are two important features that distinguish both of them. KSP2222A  can allow a collector current up to 600mA and also has a dissipation power of 625mW which can be used to drive higher loads than the BC547. It also has an open voltage collector-emitter (VCEo) of 40V.So if you're looking for an NPN transistor that could switch higher current loads, then KSP2222A might be the right choice for your project.How to use KSP2222A TransistorThe KSP222A transistor is a general-purpose transistor and therefore suitable for many applications, it is a direct substitute for the  2N2222A transistor since both have almost the same properties except for the Continuous Collector Current (IC) Rating and the Collector Emitter Voltage (V¬BE). Normally, this type of transistor is used either as a switch or as an amplifier.KSP2222A EquivalentThe equivalent IC of KSP222A is 2N2222A.2N2222A TransistorKSP2222A SMD VersionThe DXT2222A (SOT-89), KTN2222AS (SOT-23), KTN2222AU (SOT-323), DZT2222A (SOT-223), MMST2222A (SOT-323), FJX2222A (SOT-323), FMMT2222A (SOT-23),  MMBT100 (SOT-23), MMBT2222AT (SOT-523F), FMMT2222AR (SOT-23), KN2222AS (SOT-23), KST2222A (SOT-23), PMBT2222A (SOT-23) and PMST2222A (SOT-23) is the SMD version of the KSP2222A transistor.KSP2222A Replacement & EquivalentKSP2222A can be replaced with the MPS651G,MPSW01AG, NTE123AP, MPSW01A, MPS2222AG, 2SC1008, BC537, BC538, MPS650, MPS650G, MPS651, PN2222A, 2N4401, P2N2222AG, PN2219A, P2N2222A, KN2222A, KSC1008, KTN2222A, MPS2222A,  PN4033 or ZTX450.KSP2222A Alternative2N3906, 2SC5200, 2N2369, 2N3055, 2N3904BC547,  BC549, BC636, BC639KSP2222A ApplicationGeneral purpose NPN transistorCan be used to switch high current (upto 600mA) loadsIt can also be used in the various switching applications.Speed control of MotorsInverter and other rectifier circuitsCan be used in Darlington Pair.Component DatasheetKSP2222A DatasheetFAQ What is the gain value of KSP2222A?100 to 300 What type of case is the KSP2222A manufactured in?TO-92 case What is the collector current of the KSP2222A transistor?600mA How is the KSP222A transistor usually used?Either as a switch or as an amplifier

DescriptionThe 2N7002 is a logic level MOSFET with a low on-state resistance. The mosfet has a low gate to source threshold voltage of 2.1V. Typically, this makes the mosfet suitable even for 3.3V application circuits. Since the mosfet has low on state resistance it has high efficiency during when the mosfet in on. Due to this property it can maintain high switching performance and hence used widely in power management applications.The mosfet also comes in a SMD package hence can be used for compact applications. One considerable disadvantage of the mosfet is its low drain current; it can provide a continuous current of 200mA and peaks currents upto 1A at maximum threshold voltage. Anything more than that will damage the mosfet.  CatalogDescriptionPin ConfigurationFeaturesDucuments and MediaPackage OutlineApplicationsAlternativesProduct ManufacturerOrdering & QuantityPin ConfigurationPin No.Pin NameDescription1GateControls the biasing of the MOSFET2SourceCurrent flows out through Source3DrainCurrent flows in through DrainFeaturesSuitable for logic level gate drive sourcesSurface-mounted packageVery fast switchingTrench MOSFET technologyDocuments and MediaDatasheet2N7002 N-Channel logic level MOSFET DatasheetPackage Outline ApplicationsLow current and Low Voltage switching applicationsDC-DC converterseMobility applicationsApplication where low on-state resistance is required.Power management applicationsAlternativesNTR4003, FDC666, FDC5582N7002 Equivalent P-Channel: BSS84, FDN358POther N-Channel MOSFETs: BS170N, IRF3205, 2N7000, IRF1010E, IRF540NProduct ManufacturerNXP Semiconductors N.V. (NXP) is a holding company. The Company operates as a semiconductor company. The Company provides high performance mixed signal and standard product solutions. The Company's segments are High Performance Mixed Signal (HPMS), Standard Products (SP), and Corporate and Other. Its product solutions are used in a range of end-market applications, including automotive, personal security and identification, wireless and wireline infrastructure, mobile communications, multi-market industrial, consumer and computing. It engages with global original equipment manufacturers (OEMs) and sells products in all geographic regions. NXP's HPMS segment includes business lines, such as Automotive, Secure Identification Solutions (SIS), Secure Connected Devices (SCD), and Secure Interfaces and Infrastructure (SI&I). The Company's SP segment supplies a range of standard semiconductor components, such as small signal discretes and power discretes.FAQWhat is the 2N7002?A logic level MOSFET with a low on-state resistance What is the gate to source threshold voltage of the 2N7002?2.1V What is the continuous current of the mosfet 2N7002?200mA