The Kynix Components

The LS7366R is a 32-bit CMOS powerful decoder/counter chip which can be connected directly to a motor encoder to count encoder pulses.CatalogProduct OverviewLS7366R CAD ModelsLS7366R CircuitLS7366R FeaturesLS7366R Product AttributesLS7366R ApplicationsComponent DatasheetUsing WarningsLS7366R ManufacturerProduct OverviewLS7366R CounterLS7366R interfaces with the index signals from incremental encoders to perform variety of marker functions. For communications with microprocessors or microcontrollers, it provides a 4-wire SPI/MICROWIRE bus.This is a breakout board based on LS7366R quadrature counter IC. The Dual LS7366R buffer board is designed to interface directly to an encoder output such as the hall-effect encoders on our IG32, IG42, and IG52 gear motors with hall effect encoder or optical encoders. Equipped with a SPI interface, the Dual LS7366R buffer board makes is simple to monitor the position of the motors, keep track of angular position, speed, total distance traveled, etc. The Dual LS7366R buffer board can be configured to work with a quadrature output or a single pulse and direction.LS7366R can be configured to operate as 1, 2, 3 or 4-byte counter and can count in a variety of modes such as quadrature, free-running, range limit and modulo-N. Hardware I/Os are provided for event driven operations, such as processor interrupt and index related functions. If the application needs less than 32 bits transmission times can be reduced. In "modulo-n" mode the counter will remain in a given range, which can be set to the number of pulses in a full rotation so that a read from the counter will result in the exact position of the motor without need for additional calculations.The 7366 is connected to the PIC via a 4 wire SPI bus. Three of the wires, SCK, SDI, and SDO, can be shared with other SPI devices. The /SS (slave select) line must be dedicated to the 7366. A series of communication actions results in a particular internal register being read from or written to. The registers are for control, status, and output functions. Although mostly handled by the library code, here is a description of each register:LS7366R CAD ModelsLS7366R CAD ModelsLS7366R CircuitThe 7366 connects to the PIC using the SPI bus, as mentioned above. As seen in the circuit to the right, the relevant wires are SCK, SDI, SDO, and SS. In the code below, the SPI1 module is used, but with slight changes the SPI2 module could be used instead. There are other optional pins that could be connected for interrupts, etc., for more information see the 7366 datasheet.As seen in the diagram, the 7366 requires an external clock. Instead of using a crystal as shown, one could also supply an external clock pulse to the fCKI pin. For more information and frequency requirements, see the datasheet.LS7366R Features• Operating voltage: 3V to 5.5V (VDD - VSS)• 5V count frequency: 40MHz• 3V count frequency: 20MHz• 32-bit counter (CNTR).• 32-bit data register (DTR) and comparator.• 32-bit output register (OTR).• Two 8-bit mode registers (MDR0, MDR1) for programmable functional modes.• 8-bit instruction register (IR).• 8-bit status register (STR).• Latched Interrupt output on Carry or Borrow or Compare or Index.• Index driven counter load, output register load or counter reset.• Internal quadrature clock decoder and filter.• x1, x2 or x4 mode of quadrature counting.• Non-quadrature up/down counting.• Modulo-N, Non-recycle, Range-limit or Free-running modes of counting• 8-bit, 16-bit, 24-bit and 32-bit programmable configuration synchronous (SPI) serial interfaceLS7366R Product AttributesSpecificationsValuesOperating Temperature Range-25 °C~80 °CRoHSNon-CompliantLS7366R ApplicationsLS7366R can be used with your Arduino, mBed, Basic Micro, or any other microcontroller platform. Easily interface your motors with our encoder buffer breakout, pull-up boards and Kangaroo motion controller.Note: The LS7366R is 3.3v tolerant but the breakout is equipped with a 40MHz oscillator. The maximum external clock speed for 3.3V operation is 20MHz. This may cause issues when attempting to run it on a 3.3V system. For optimum performance it is suggest to use a 5V supply and level shift the inputs when using a 3.3V microcontroller.The 7366 stores a current count of the pulses, which can be read by the PIC via SPI at any time. This is in contrast with the LS7166, which uses a parallel bus to communicate with the PIC. By using the 7366, the PIC can keep track of a motor's current position without devoting any onboard resources to tracking pulses. Component DatasheetLS7366R-LSI PDFUsing WarningsPlease check their parameters and pin configuration before replacing them in your circuit.LS7366R ManufacturerLSI Computer Systems, Inc. (LSI/CSI) began operations as the world's first fabless semiconductor company in 1969. Since its inception, LSI/CSI has been a leader in the design and production of affordable full custom and standard mixed-signal, digital and analog integrated circuits. Using a broad array of process technologies, LSI/CSI has produced ICs that extend from the consumer and industrial marketplace to military and aerospace applications. The company’s proven expertise and strong reputation have made LSI/CSI the IC provider of choice for leading manufacturers in a broad range of industries.FAQ What does LS7366R interface with?Index signals What type of bus does LS7366R provide for communications with microprocessors or microcontrollers?4 wire SPI/MICROWIRE bus What can the Dual LS7366R buffer board work with?A quadrature output or a single pulse and direction What interface does the Dual LS7366R buffer board have?SPI What is LS7366R mostly handled by?Library code

I. DesriptionIn the field of measurement and control, it is often encountered that the output signal of the monitored object is small, and it is difficult to directly collect it. Generally, it needs to be amplified before processing. This article introduces a method of implementing a small signal acquisition system. The smallest system is realized by using the single-chip STC25A60S2 with an A/D conversion function and the easy-to-use amplifier AD620 with a precise amplification function. The system design and implementation are discussed and the acquisition is introduced in detail. The process of small signal, and gives practical application examples, as well as the application of small-signal acquisition in related fields.AD620CatalogI. DesriptionII. AD620 IntroductionIII. Introduction to STC12C5A60S2IV. System Hardware Design4.1 System Principle Block Diagram4.2 Power Supply Circuit Design4.3 Signal Conditioning Circuit4.4 System Decoupling Circuit4.5 Realization of A/D Conversion4.6 Follow-up WorkV. Practical ApplicationVI. ConclusionFAQOrdering & QuantityII. AD620 IntroductionAs a monolithic instrument amplifier, AD620  has low power consumption, a chip with high gain through external resistors, and features low input drift and temperature drift. AD620 is developed from the traditional three operational amplifiers, but some of the main performance is better than the design of the instrument amplifier composed of three operational amplifiers, such as wide power supply range (±2. 3～±18 V), small design volume, and very power consumption Low (the maximum power supply current is only 1. 3 mA), so it is suitable for low-voltage, low-power applications.Figure 1 Schematic diagram of AD620 principle The monolithic structure and laser crystal adjustment of AD620 allows circuit components to be closely matched and tracked, thereby ensuring the inherent high performance of the circuit. AD620  is a three-op-amp integrated instrumentation amplifier structure. In order to protect the high precision of gain control, the input transistor provides a simple differential bipolar input and uses the β process to obtain a lower input bias current. Through the input stage internal op-amp The feedback to keep the collector current of the input transistor constant, and the input voltage is added to the external gain control resistor RG. The two internal gain resistors of  AD620  are 24.7 k8, so the gain equation is: G =49.4 kΩ/R G + 1 (1) For the required gain, the external control resistance value is: R G =49.4/(G-1)kΩ (2) III. Introduction to STC12C5A60S2 STC12C5A60S2 is a new generation 8051 single-chip microcomputer with an A/D conversion function. The instruction code is fully compatible with the traditional 8051, but the speed is 8-12 times faster. With 8 channels of high-speed 10-bit input A/D conversion (250k/s), it can be used for temperature detection, battery voltage detection, key scanning, spectrum detection, etc. The user can set any channel as A/D conversion, and the ports that do not need to be used as A/D can continue to be used as I/O ports. Its characteristics are as follows:Figure 2 STC12C5A60S2(1) On-chip integrated 1280 bytes RAM;(2) With EEPROM function (STC12C5A62S2/AD/PWM without internal EEPROM);(3) Enhanced 8051 CPU, 1T, single clock/machine cycle, instruction code is fully compatible with traditional 8051;(4) Internal integrated MAX810 dedicated reset circuit (when the external crystal is below 12M, the reset pin can be directly connected to the ground with 1K resistance);(5) User application space 8K /16K / 20K / 32K / 40K / 48K / 52K / 60K / 62K bytes;(6) ISP (In-System Programmable)/IAP (In-Application Programmable), no need for a dedicated programmer, no need for a dedicated emulator, you can download the user program directly through the serial port (P3.0/P3.1), and one-piece can be completed in a few seconds ;(7) STC12C5A60S2 series have dual serial ports, only those with the S2 logo suffix have dual serial ports, RxD2/P1.2 (can be set to P4.2 by the register), TxD2/P1.3 (can be set to P4.3 by the register) ;(8) General I/O port  s (36/40/44), after reset, they are: quasi-bidirectional port/weak pull-up (normal 8051 traditional I/O port  ), which can be set to four modes: quasi-bidirectional port/weak Pull-up, push-pull/strong pull-up, only input/high impedance, open-drain, each I/O port  drive capacity can reach 20mA, but the whole chip should not exceed 120mA;(9) A/D conversion, 10-bit precision  ADC, 8 channels in total, conversion speed up to 250K/S (250,000 times per second), universal full-duplex asynchronous serial port (UART), because the STC12 series is high-speed 8051, can reuse timer or PCA software to realize multiple serial ports. IV. System Hardware Design4.1 System Principle Block Diagram Generally speaking, before the signal is used, it needs to be filtered and then amplified, or amplified and then filtered, and then obtained/perceived by means such as A/D. For small signals, the signal amplitude is only a few millivolts or even smaller. If filtered first, useful signals may be filtered out. Therefore, in this case, you need to amplify first, then filter, and then perform A/ D conversion or other processing. According to the characteristics of this system, the interference in the system can be ignored, so the signal filtering link is not considered. Therefore, the system is mainly realized through three important links: signal extraction, signal amplification, and A/D acquisition. The data generated in the third link can guide people's work or display relevant information. The block diagram of the entire system is shown in Figure 3.Figure 3 System block diagram4.2 Power Supply Circuit Design AD620 amplifier can use single power supply or dual power supply, but when using dual power supply, its performance is better than single power supply. In integrated circuit design, single power supply is easy to implement, but considering the working performance of the chip, dual power supply is used in this system. Use the ICL7660S chip to convert an external single power supply into a dual power supply. ICL7660S is a voltage conversion chip that can realize the function of converting a positive voltage to a negative voltage, and its peripheral circuit is relatively simple. The specific circuit is shown in Figure 4.Figure 4 Power supply implementation schematic diagram The other chips in the system are powered by a single 5V power supply, and the connected 5V power supply can be used without any processing, which is not described here. 4.3 Signal Conditioning Circuit The actual weak signal is generally mV level or even smaller. Before processing, it needs to be amplified and then A/D collected. According to the A/D function of STC12C5A60S2, it is necessary to accurately amplify the signal to reach the V level, so the AD620 amplifier is used. AD620 has a good amplification effect on 2 input differential signals. In practical applications, the signals are generally generated by electric bridges. In order to realize signal amplification, AD620 needs an external resistor, which determines the amplification factor together with the internal resistor. Suppose the magnification is G, then there is the following formula.G=(RG/R1)+1(1)can also be written as the following formula: G=49.4kΩ/RG+1(2) 1) In the formula, RG is the internal resistance of AD620.  and R1 is the external resistance. It can be seen from formulas (1) and (2) that the size of RG in formula (1) is 49.4kΩ. The conditioned signal is output through the 6-pin of AD620,  At this time, it can be directly connected to the A/D conversion chip to realize data collection. It can be reduced by the corresponding multiple when using it. The principle of signal conditioning is shown in Figure 5.Figure 5 Signal conditioning circuit 4.4 System Decoupling Circuit Since the system mainly realizes small signal amplification and A/D conversion after amplification, the chip that completes the A/D function of this system, namely STC12C5A60S2, uses its own working power supply as the reference voltage. In order to ensure the consistency of the conversion results, it is necessary to ensure the power supply voltage stability. To filter out the interference in the power supply, it can be filtered by multiple capacitors in parallel. After the capacitors are connected in parallel, the capacitance value increases, but the equivalent resistance inside the capacitor is reduced due to the parallel connection, which is beneficial to reduce the loss. Therefore, many capacitors are used in parallel, and the realization principle is shown in Figure 6.Figure 6 Power decoupling circuit 4.5 Realization of A/D Conversion As mentioned earlier, STC12C5A60S2 is a single-chip microcomputer with an A/D conversion function.  which is convenient, simple, and multi-functional. Its A/D conversion only requires 90 clock cycles (related to its operating frequency) at the fastest. This system Uses it to achieve A/D conversion.STC12C5A60S2 uses port P1 as an 8-channel A/D conversion input interface. When using it, you only need to set it as an analog interface. By setting the corresponding register, the A/D conversion can be completed. The unused pins can still be used as ordinary tubes. This system realizes the A/D conversion of one input signal, so it only needs to set one. In this system, P1.0 port is used as the signal input port. This system realizes the principle of A/D conversion as shown in Figure 7.Figure 7 A/D acquisition circuit 4.6 Follow-up Work After the A/D conversion is completed, data analysis is required. Generally, it can be sent to the upper computer through the communication port (usually serial port), and the data is processed by the upper computer. According to the different characteristics of the specific system, the data processing methods are also different, so it's no need to  discuss them in detail here.Table 1 AD conversion data and actual dataAfter the system performs A/D conversion on signals of different sizes, a series of actual data and theoretical data are obtained, as shown in Table 1. Draw the curve of A/D data through Excel, and found that the system A/D converter has good linearity. As shown in Figure 8.Figure 8 Linearity of A/D converter V. Practical Application The small signal conditioning, A/D conversion, and processing methods are discussed in more detail above. The specific application is introduced below through examples. As a kind of sensing element, resistance strain gauge is commonly used to monitor the deformation of the object. Generally, the strain gauge is attached to the side point of the component. After the component is stressed, due to the strain of the measuring point, the resistance changes, resulting in a weak voltage change. The voltage change can be calculated to obtain the deformation degree of the component, so as to achieve the purpose of monitoring the condition of the component and guide the relevant engineering personnel to deal with it. This system can be applied to the voltage generated by the electric bridge. A schematic diagram of the electric bridge is shown in Figure 9. In the figure, R4, R3, R1, and R2 are the four arms of the bridge, R4 and R3 are fixed resistances of impedance, and R1 and R2 are in One is a resistor whose resistance value changes after being stressed. R4 and R3 have the same resistance value, and R1 and R2 have the same resistance value when they are not stressed. In the case of no force, the two points of the bridge 3 and 4 are equipotential, that is, the potential difference is 0.  If it is input as AD620,  the input signal is considered to be 0, and the bridge is said to be balanced at this time. When the force of R1 or R2 changes, the result of the change is reflected in its resistance value, which can be obtained by Ohm’s law. The potential at points 3 and 4 is different, that is, there is a potential difference. At this time, the bridge is out of balance, but at this time The signal is very weak and cannot be collected directly. Therefore, the signal is amplified through the signal conditioning circuit mentioned in the article, that is, points 3 and 4 in the bridge are connected to pins 2 and 3 of AD620.  After amplification, the A/D acquisition is performed.Figure 9 Schematic diagram of electric bridgeThis system uses a simple electric bridge built by itself during simulation, as shown in Figure 10.Figure 10 Simple electric bridge By adjusting R2 in the figure, different weak signals are generated, and the simple bridge 1 and 2 are connected to the signal conditioning circuit, and then after A/D conversion, weak signal acquisition can be realized. The 1, 2 ends of the simple electric bridge correspond to the 3 and 4 ends in the figure.  In this simulation, adjust R2 to generate about 5.35mV at both ends of 1, 2 and adjust the external resistance in the signal conditioning circuit to 160.7Ω. The calculated magnification is about 308.4 times, and the A/D reference voltage is 4.256V By measuring the output of AD620, it can be obtained that the voltage is 1.645V, and the magnification factor G=1.647V/5.35mV≈308 can be calculated. It can be seen that the magnification effect is good (after removing the magnification effect, the error is only nV level). Through multiple A/D conversions, the returned results are all around 0x018B, which proves that the system has high credibility (it has been used in actual systems). VI. Conclusion This article describes in detail the design and implementation of small-signal acquisition systems from chip selection, circuit design, etc., such as 8-bit single-chip STC12C5A60S2 as the controller and A/D converter; AD620 as the main chip of the signal conditioning circuit; electric bridge principle, etc. Through the test, the circuit has realized its function well, and it has accomplished the expected goal excellently in the actual system, which has certain practical value.FAQWhat 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. 

Power supply is inseparable from electronic products.The main function of the power supply is to obtain the voltage required by each device through the low-voltage direct current supplied by the outside through the power management device, and meet the requirements of current, ripple, and startup sequence.Depending on the specific requirements of the device, multiple DC-DC circuits may be required in different ways.There are two main ways of voltage stabilization:Linear regulatorSwitching regulatorIn the following paragraphs, we will introduce you to these two voltage regulation methods, as well as 5 classic regulated power supply devices. Hope you enjoy.CatalogI Linear voltage stabilizationII Switching regulatorIII Top 5 Regulated Power Supply Electronic Components3.1 78XX3.2 79XX3.3 LM317/LM1173.4 1117 series3.5 TPS51200IV ConclusionI Linear voltage stabilizationA variable resistor formed by a triode that works in a linear state performs constant current control on the load to obtain a stable voltage output.This method for linear voltage stabilization is simple in structure and high in noise suppression (up to 60dB, which is more than 1000 times), but generally the efficiency is relatively low. The voltage can be stabilized only when the input voltage is higher than the output voltage by a certain pressure difference, and it can only be used for step-down conversion. .The pressure difference of the conventional linear regulator is as high as 2.5V, so the efficiency is relatively low, and the LDO linear regulator can achieve a lower pressure difference.For example, when the load is as high as 1A, the pressure difference can be reduced to 350mA. Of course, its efficiency depends on the specific input and output voltages used.II Switching regulatorSwitching regulator is composed of a transistor that works in switching mode, an inductance of energy storage, and a capacitor that smoothes the ripple, and a stable output voltage is obtained by means of PWM or PFM.The advantage of the switch mode is that it can step down, step up, and back pressure, the input voltage range can be very wide, and the efficiency can be very high (some can reach more than 95%).The disadvantage is that the peripheral circuit is more complicated, and the selection of peripheral components is more sensitive.In addition, high-frequency switching signals will cause greater interference and ripple on the voltage output.III Top 5 Regulated Power Supply Electronic ComponentsAlthough power supply technology is changing rapidly, a variety of high-efficiency, highly integrated, high-performance devices continue to be introduced.But according to statistics, the top ten devices for voltage regulators are some of the classic devices.After all, these devices can meet most of the application scenarios, and cost-effective. So let's see what these devices are!3.1 78XXLM7805CV regulatorThe most classic linear voltage regulator has a very simple structure. It can work with only one capacitor at the input and output ends. It is also called a three-terminal regulator. Many original manufacturers make this device, and the functions and pins are compatible. You can see MC78xx, LM78xx, etc., and xx represents the voltage value of the regulated output. For example, LM7805 is a regulator with a regulated output of 5V. MC7824 is a voltage regulator whose regulated output is 24V.The output current of 78xx series devices is also different. For example, the output current of LM7805 is a maximum of 1A, the output current of LM78M05 is a maximum of 500mA, and the output current of LM78L05 is a maximum of 100mA.Their packaging is also different. The 78L05 package with only 100mA can be as small as a triode. The 78xx series devices require a voltage difference of 2.5V or more between the input voltage and the output voltage. Its conversion efficiency is Vout/Vin. For example, input 12V voltage to get a 5v regulated output, and its efficiency is 5/12 = 41.6%. If the load current reaches 1A, the heat loss on the 7805 device is as high as (12- 5) *1 = 7W, which is why a heat sink must be added to many 78xx series devices;3.2 79XX79xx series79xx and 78xx are often used in combination. 78xx gets a positive voltage to ground, 79xx gets a negative voltage to ground, except that it is the same as 78xx;3.3 LM317LM317 linear regulatorThe output voltage of the above 78xx and 79xx devices is fixed and cannot be adjusted. In contrast, LM317 is a linear regulator with adjustable output voltage, and there are also different packages that support different current outputs, and the maximum output circuit can be as high as 1.5A. In addition, LM317 also requires a voltage difference of more than 2.5v to work normally, and it also has the same advantages and disadvantages as 78xx;3.4 1117 series1117 series linear regulators The 1117 series of devices are very classic LDO linear regulators. Compared with 78xx and LM317 series devices, the difference between its required input voltage and output voltage is 1.2V, so it can be widely used in battery-powered portable systems. For example, through 4 1.25V batteries (reaching 5V when full power), when the power is not enough to 4.5V voltage, it can still get 3.3V regulated output through 1117-3.3 for the 3.3V circuit on the board to work.Many manufacturers have 1117 versions, such as TLV1117, LT1117, AMS1117, LM1117, etc. The output voltage also has a variety of fixed value versions and adjustable output versions. It can be said that it is the best alternative to 78xx and LM317. Of course, the output current of 1117 is only up to 800mA, and many small package versions are not suitable for working with large voltage differences under high current conditions;3.5 TPS51200TPS51200 LDOTPS51200 is also an LDO from TI, dedicated to the power supply system of various DDR memories. Since almost all high-speed embedded systems will use DDR memory, it is not uncommon for this device to be widely adopted. The control of different output voltages through external voltage divider resistors brings a high degree of flexibility to the use of the device. Its output current is as high as 3A, so it meets the current requirements of high-speed memory.IV ConclusionThe above are several classic devices based on linear voltage regulation conversion, with different voltage differences and different currents, which can meet the application in different fields. We can make reasonable choices according to their needs. The main advantage of linear regulation is low noise. Therefore, it is widely used in the power supply of analog circuits and radio frequency circuits. Its disadvantage is that it can only be used for step-down. If the output voltage is higher than the input voltage, the linear regulator will be powerless.

CatalogFeaturesDescriptionOrder CodePin ConnectionsSchematic DiagramAbsolute Maximum RatingsElectrical CharacteristicsParameter Measurement InformationTypical ApplicationsTL074CN DatasheetTL074CN FAQ Features■ Wide common-mode (up to Vcc+) and differential voltage range■ Low input bias and offset current■ Low noise en = 15nV/√Hz (typ)■ Output short-circuit protection■ High input impedance J–FET input stage■ Low harmonic distortion : 0.01% (typ)■ Internal frequency compensation■ Latch up free operation■ High slew rate : 13V/µs (typ) DescriptionThe TL074, TL074A and TL074B are high speed J–FET input quad operational amplifiers incorporating well matched, high voltage J–FET and bipolar transistors in a monolithic integrated circuit. The devices feature high slew rates, low input bias and offset currents, and low offset voltage temperature coefficient. Order CodePart Number  Temperature Range PackageNDTL074M/AM/BM-55°C, +125°C··TL074I/AI/BI-40°C, +105°C··TL074C/AC/BC0°C, +70°C··Example : TL074INN = Dual in Line Package (DIP)D = Small Outline Package (SO) - also available in Tape & Reel (DT) Pin Connections Schematic Diagram Absolute Maximum RatingsSymbolParameterTL074M, AM, BMTL074I, AI, BITL074C, AC, BCUnitVCCSupply voltage - note 1)±18VViInput Voltage - note 2)±15VVidDifferential Input Voltage - note 3)±30VPtotPower Dissipation680mW Output Short-circuit Duration - note 4)Infinite ToperOperating Free-air Temperature Range-55 to +125-40 to +1050 to +70°CTstgStorage Temperature Range-65 to +150°C1.All voltage values, except differential voltage, are with respect to the zero reference level (ground) of the supply voltages where the zero reference level is the midpoint between VCC+ and VCC-.2.The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less.3.Differential voltages are the non-inverting input terminal with respect to the inverting input.4.The output may be shorted to ground or to either supply. Temperature and/or supply voltages must be limited to ensure that the dissipation rating is not exceeded. Electrical CharacteristicsVCC = ±15V, Tamb = +25°C (unless otherwise specified)Symbol Parameter TL074I,M,AC,AI,AM, BC,BI,BMTL074CUnit Min.Typ.Max.Min.Typ.Max.  VioInput Offset Voltage (Rs = 50W)Tamb = +25°C TL074TL074A TL074BTmin £ Tamb   £ Tmax TL074 TL074A TL074B  331 10631375  3 10  13mVDVioInput Offset Voltage Drift 10  10 mV/°C IioInput Offset Current - note 1)Tamb = +25°CTmin £ Tamb £ Tmax  5 1004  5 10010 pA nA IibInput Bias Current -note 1 Tamb = +25°CTmin £ Tamb £ Tmax  20 20020  30 20020 pA nA AvdLarge Signal Voltage Gain (RL = 2kW, Vo = ±10V) Tamb = +25°CTmin £ Tamb £ Tmax 5025 200  2515 200 V/mV SVRSupply Voltage Rejection Ratio (RS = 50W)Tamb = +25°CTmin £ Tamb £ Tmax 8080 86  7070 86 dB ICCSupply Current, no load, per amplifier Tamb = +25°CTmin £ Tamb £ Tmax  1.4 2.52.5  1.4 2.52.5mAVicmInput Common Mode Voltage Range±11+15-12 ±11+15-12 V CMRCommon Mode Rejection Ratio (RS = 50W)Tamb = +25°CTmin £ Tamb £ Tmax 8080 86  7070 86 dB IosOutput Short-circuit Current Tamb = +25°CTmin £ Tamb £ Tmax 1010 40 6060 1010 40 6060mA ±VoppOutput Voltage SwingTamb = +25°C RL = 2kW RL = 10kWTmin £ Tamb  £ Tmax RL = 2kW RL = 10kW 10121012 1213.5  10121012 1213.5 VSRSlew Rate (Tamb = +25°C)Vin = 10V, RL = 2kW, CL = 100pF, unity gain 8 13  8 13 V/mstrRise Time (Tamb = +25°C)Vin = 20mV, RL = 2kW, CL = 100pF, unity gain  0.1   0.1 msKovOvershoot (Tamb = +25°C)Vin = 20mV, RL = 2kW, CL = 100pF, unity gain  10   10 %GBPGain Bandwidth Product (Tamb = +25°C)Vin = 10mV, RL = 2kW, CL = 100pF, f= 100kHz 2 3  2 3 MHzRiInput Resistance 1012  1012 W Parameter Measurement InformationVoltage Follower  Gain-of-10 Inverting Amplifier Typical ApplicationsAudio Distribution Amplifier  Positive Feedback Bandpass Filter TL074CN DatasheetYou can download the datasheet of TL074CN from the link given below:TL074CN Datasheet TL074CN FAQWhat is precision operational amplifier?This single-function precision op amp is a specialized device that features extremely low voltage offset, offset drift, and input bias current while also balancing bandwidth, noise, and power dissipation performance. Why negative power supply is used in operational amplifiers?Opamps don't produce voltage or current. They let more or less current pass from the powersupply to the output. To get a negative voltage out of an opamp, you have give it a powersupply with a negative voltage. The output of an opamp is limited to what is available from the supply rails. What are the main differences between op amp and instrumentation amplifier?Op amps have two inputs and one output. Instrumentation amps usually have three inputs (ref is an input) and a gain control facility, and one output.

The DS1621 measures temperature using a bandgap-based temperature sensor. CatalogProduct DescriptionCAD ModelPinoutBenefits and FeaturesApplicationsSpecificationsProduct ComplianceDS1621 Circuit ExamplesDS1621 DatasheetMaxim IntegratedFAQ Product DescriptionTemperature measurements require no external componentsMeasures temperatures from -55°C to +125°C in 0.5°C increments. Fahrenheit equivalent is -67°F to 257°F in 0.9°F incrementsTemperature is read as a 9-bit value (2-byte transfer)Wide power supply range (2.7V to 5.5V)Converts temperature to digital word in less than 1 second         CAD Model  DS1621 CAD Model PinoutPinout Benefits and FeaturesSimply Adds Temperature Monitoring and Control to Any SystemMeasures Temperatures From -55°C to +125°C in 0.5°C Increments. FahrenheitEquivalent is -67°F to 257°F in 0.9°F IncrementsTemperature is Read as a 9-Bit Value (2-Byte Transfer)Converts Temperature to Digital Word in Less than 1sThermostatic Settings are User Definable And NonvolatileCan Be Used in a Wide Variety of ApplicationsPower Supply Range (2.7V to 5.5V)Data is Read From/Written Via a 2-WireSerial Interface (Open Drain I/O Lines)Saves SpaceTemperature Measurements Require NoExternal Components8-pin DIP or SO package (208-mil) Packages ApplicationsThermostatic ControlsIndustrial SystemsConsumer ProductsThermometers  SpecificationsProduct AttributeAttribute ValueManufacturer:Maxim IntegratedProduct Category:Board Mount Temperature SensorsRoHS: DetailsOutput Type:DigitalConfiguration:LocalAccuracy:+/- 2 CSupply Voltage - Min:2.7 VSupply Voltage - Max:5.5 VInterface Type:2-Wire, I2C, SMBusResolution:12 bitMinimum Operating Temperature:- 55 CMaximum Operating Temperature:+ 125 CShutdown:No ShutdownMounting Style:Through HolePackage / Case:DIP-8Packaging:TubeProduct:Thermometers and ThermostatsSeries:DS1621Brand:Maxim IntegratedTemperature Threshold:ProgrammableOperating Supply Current:1 mAProduct Type:Temperature SensorsFactory Pack Quantity:50Subcategory:SensorsPart # Aliases:DS1621 90-16210+000Unit Weight:0.017284 oz  Product ComplianceUSHTS:8542390001CAHTS:8542390000CNHTS:8542319090JPHTS:8542390990MXHTS:85423999TARIC:8542399000ECCN:EAR99  DS1621 Circuit ExamplesPIC16F84 and DS1621 temprature control circuit: Temprature controller schematic  Interfacing Arduino with DS1621 temperature sensor circuit: Project circuit diagram is shown below.The 1602 LCD screen (2 rows and 16 columns) is used to display temperature values in degrees Celsius and degrees Fahrenheit where:RS —> Arduino digital pin 2E   —> Arduino digital pin 3D4 —> Arduino digital pin 4D5 —> Arduino digital pin 5D6 —> Arduino digital pin 6D7 —> Arduino digital pin 7VSS, RW, D0, D1, D2, D3 and K are connected to Arduino GND,VEE to the 10k ohm variable resistor (or potentiometer) output,VDD to Arduino 5V and A to Arduino 5V through 330 ohm resistor.VEE pin is used to control the contrast of the LCD. A (anode) and K (cathode) are the back light LED pins. Interfacing Arduino with DS1621 temperature sensor circuit The DS1621 sensor SDA (serial data) and SCL (serial clock) pins are respectively connected to Arduino A4 and A5 pins (ATmega328P hardware I2C module pins). It is is supplied with 5V from the Arduino board.The three pins: A0, A1 and A2 are slave address select pins which are connected to ground, therefore the DS1621 takes an address of 0x48 (1001+A2+A1+A0).DS1621 DatasheetDS1621 Datasheet Maxim IntegratedMaxim Integrated provides ease of design, and speeds time to market, through analog integration. The company's analog ICs offer extra features and functionality carefully designed to streamline circuit and simplify design. Look to Maxim for solutions for consumer electronics, personal computers and peripherals, mobile devices, wireless and fiber communications, test equipment, instrumentation, video displays, and automotive applications. Maxim’s analog and mixed-signal solutions include data converters, interface circuits, power, RF wireless circuits, clocks and oscillators, microcontrollers (MCUs), operational amplifiers (op amps), and sensors. FAQWhat is DS1621?The DS1621 Digital Thermometer and Thermostat provides 9-bit temperature readings, which indicate the temperature of the device. The thermal alarm output, TOUT, is active when the temperature of the device exceeds a user-defined temperature TH.Are temperature sensors interchangeable?The three main types of temperature sensors are RTD, Thermocouple, and Thermistor. Most Oven Industries temperature sensors are interchangeable within the specific temperature range for which they are designed – meaning in the event one is damaged, it can be swapped out with no need to recalibrate the thermal system.How do you trick a temperature sensor?Alternatively if that doesn't work and you're feeling salty about it, put a cup of ice below it, or tape an cold pack ( like the ones you use for lunch box) to it because it will trick the sensor into thinking it's colder than it is, and will engage the heat.

Product OverviewThe ATMEGA328P 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 ATMEGA328P achieves through puts approaching 1MIPS per MHz allowing the system designer to optimize power consumption  versus processing speed  . The high-performance picoPower 8bit AVR RISC-based microcontroller combines 32KB ISP flash memory with read-while-write capabilities, 1024B EEPROM, 2KB SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible timer/counters with compare modes, internal and external interrupts, serial programmable USART, a byte-oriented 2-wire serial interface, SPI serial port, a 6-channel 10-bit A/D converter (8-channels in TQFP and QFN/MLF packages), programmable watchdog timer with internal oscillator, and five software selectable power saving modes. The device operates between 1.8-5.5 volts. This blog will introduce ATMEGA328P-AU systematically from its features, pinout to its specifications, applications, also including ATMEGA328P-AU datasheet and so much more.CatalogProduct OverviewRelated Video IntroductionATMEGA328P-AU FeaturesATMEGA328P-AU PinoutATMEGA328P-AU CAD ModelsATMEGA328P-AU Block DiagramATMEGA328P-AU PackageATMEGA328P-AU SpecificationATMEGA328P-AU ManufacturerATMEGA328P-AU DatasheetUsing WarningsATMEGA328P-AU FAQ Related Video Introduction Video: Bootloader and upload to Atmega328P-AU ATMEGA328P-AU Video Description: Quickly burn a bootloader to Atmega328 TQFP 32 pin chip using a USBASP programmer without needing to use an Arduino as ISP. This is an easy tutorial to use the Arduino IDE alone to program and upload your sketch on the fly while the SMD chip is still in your breadboard. ATMEGA328P-AU FeaturesHigh-performance, Low-power Atmel AVR 8-bit MicrocontrollerAdvanced RISC Architecture   - 131 powerful instructions – most single clock cycle execution   - 32 × 8 General Purpose Working Registers + Peripheral Control Registers   - Fully Static Operation   - Up to 16MIPS Throughput at 16MHz   - On-chip 2-cycle MultiplierHigh Endurance Non-volatile Memory segments   - 32K bytes of in-system self-programmable flash program memory   - 1Kbytes EEPROM   - 2Kbytes 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 SecurityPeripheral Features    – Two 8-bit Timer /Counters with separate prescaler  and compare mode    – One 16-bit Timer/Counter with separate prescaler  , compare mode, and capture mode    – Real Time Counter with Separate Oscillator    – Six PWM channels    – 8-channel 10-bit ADC in TQFP and QFN/MLF package            – Temperature measurement    – Programmable serial USART     – Master/Slave SPI Serial Interface    – Programmable Watchdog Timer with On-chip Oscillator    – On-chip Analog Comparator    – Byte Oriented 2-wire Serial Interface    – 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, and  Extended Standby 'I/O and Packages    ̶  23 programmable I/O lines     ̶  32-lead TQFP, and 32-pad QFN/MLFOperating voltage   – -40°C to 85°C IndustrialSpeed Grades   – 0 to 8MHz at 2.7 to 5.5V (automotive temperature range: –40°C to +125°C)   – 0 to 16MHz at 4.5 to 5.5V (automotive temperature range: –40°C to +125°C)Low power consumption        ̶  Active mode: 1.5mA at 3V - 4MHz     ̶  Power-down mode: 1µA at 3V ATMEGA328P-AU PinoutThe following figure is the diagram of ATMEGA328P-AU pinout. ATMEGA328P-AU Pinout ATMEGA328P-AU CAD ModelsThe followings are ATMEGA328P-AU Symbol, Footprint, and 3D Model . ATMEGA328P-AU Symbol ATMEGA328P-AU Footprint ATMEGA328P-AU 3D Model ATMEGA328P-AU Block DiagramThe following figure shows the block diagram of ATMEGA328P-AU. ATMEGA328P-AU Block Diagram ATMEGA328P-AU PackageThe following diagram shows the ATMEGA328P-AU package. ATMEGA328P-AU Package ATMEGA328P-AU SpecificationProduct AttributeAttribute ValueManufacturer:MicrochipProduct Category:8-bit Microcontrollers - MCUSeries:ATmega328PMounting Style:SMD/SMTPackage / Case:TQFP-32Core:AVRProgram Memory Size:32 kBData Bus Width:8 bitADC Resolution:10 bitMaximum Clock Frequency:20 MHzNumber of I/Os:23 I/OOperating Supply Voltage:1.8 V to 5.5 VMinimum Operating Temperature:- 40 CMaximum Operating Temperature:+ 85 CPackaging:TrayData RAM Type:SRAMData ROM Size:1 kBData ROM Type:EEPROMHeight:1 mmInterface Type:I2C, SPI, USARTLength:7 mmMoisture Sensitive:YesNumber of ADC Channels:8 ChannelNumber of Timers/Counters:3 TimerProcessor Series:megaAVRProduct:MCUProduct Type:8-bit Microcontrollers - MCUProgram Memory Type:FlashFactory Pack Quantity:250Supply Voltage - Max:5.5 VSupply Voltage - Min:1.8 V ATMEGA328P-AU ManufacturerAtmel Corporation is a global leader in designing, manufacturing and marketing advanced semiconductors including microcontroller (MCU), programmable logic, and nonvolatile memory. By combining these core technologies, Atmel meets the evolving and growing needs of today's electronic system design engineer through the production of general purpose and application specific system level integrated chips. Atmel's world class expertise and wealth of experience in system-level integration enable all of Atmel's products to be developed from their constituent blocks with minimum delay and risk. ATMEGA328P-AU DatasheetYou can download ATMEGA328P-AU datasheet from the link given below:ATMEGA328P-AU Datasheet Using WarningsNote: Please check their parameters and pin configuration before replacing them in your circuit. ATMEGA328P-AU FAQWhat is difference between 8bit and 16bit microcontroller?The main difference between 8 bit and 16 bit microcontrollers is the width of the data pipe. As you may have already deduced, an 8 bit microcontroller has an 8 bit data pipe while a 16 bit microcontroller has a 16 bit data pipe. A 16 bit number gives you a lot more precision than 8 bit numbers. What is an 8 bit MCU?An 8 bit microcontroller processes 8-bits of data at any particular time. They have 32-bit arithmetic logic units, registers, and bus width. In general, this means that a 32-bit can handle quadruple the amount of data, making it technically more data efficient. What is a microcontroller used for?Microcontroller is a compressed micro computer manufactured to control the functions of embedded systems in office machines, robots, home appliances, motor vehicles, and a number of other gadgets. A microcontroller is comprises components like - memory, peripherals and most importantly a processor. What is microcontroller and how it works?Microcontrollers are embedded inside devices to control the actions and features of a product. Hence, they can also be referred to as embedded controllers. Microcontrollers can take inputs from the device they controlling and retain control by sending the device signals to different parts of the device. What are microcontrollers made of?A microcontroller contains one or more CPUs (processor cores) along with memory and programmable input/output peripherals. Program memory in the form of ferroelectric RAM, NOR flash or OTP ROM is also often included on chip, as well as a small amount of RAM.