HT8 MCU OPA Application Descriptions
●In this application note the integrated operational amplifiers within four MCUs are introduced. The MCUs in question are the HT66F45x0 series, HT45F56, HT45F5Q-2, and HT66FM(5230, 5240, 5242, 5440) series.
●The HT66F45x0 series op-amp features include multiple switch and input path selections, multiple reference voltage selections, multiple internal software gain controls, debounce time control, hysteresis, input offset voltage calibration and four-bandwidths of 5kHz, 40kHz, 600kHz and 2MHz. Software control allows users to adjust the op-amp bandwidth based on the required application response speed. The device power consumption can also be optimisied by selecting a suitable bandwidth. These features combine to enhance the circuit flexibility allowing them to be widely used in a variety of applications such as smoke detectors and other related products.
●The HT45F56 MCU contains an internal vibration detection circuit. In order to detect a tiny vibration external analog signal, it integrates a 1~1000 gain PGA, a comparator and a 6-bit DAC which can internally set a threshold voltage. This can then switch the input comparison path multiplexer through an internal register. An external circuit can be matched with a variety of sensors such as piezoelectric vibration sensors, magnetic induction vibration sensors, etc.
●The HT45F5Q-2 MCU contains a charging management module which is divided into two parts. The first part contains two OPAs and DACs for controlling the charging voltage and current. The charger's constant voltage mode (CV) and constant current (CC) mode upper limit can be setup using the programmable DAC. The CV control uses a 12-bit DAC while the CC control uses an 8-bit DAC. The second part is a set of fixed gain OPAs which can be used to increase the current resolution and reduce any power losses in the current detect resistor.
●The HT66FM series of MCUs include a fully integrated phase current sensing circuit for motor protection drive circuits.
●The application note also describes the application and characteristic parameters of other common op amp functions, such as non-inverting amplifiers, inverting amplifiers and voltage followers, adders and subtractors, etc. The two OPA principles which are most important are those of the virtual short and virtual open. For the virtual short point of view the two input terminals appear to be short-circuited, that is they remain at the same potential. For the virtual open, the input impedance appears as infinite, which is equivalent to the open circuit. This is to imply that the current flowing into the positive and negative input terminals is effectively zero.
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HT66F45x0 series 、 HT66F45x0 、 HT45F56 、 HT45F5Q-2 、 HT66FM5230 、 HT66FM5240 、 HT66FM5242 、 HT66FM5440 、 HT66FM series 、 HT66FM5230 series 、 HT66FM5240 series 、 HT66FM5242 series 、 HT66FM5440 series |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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August 30, 2020 |
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V1.10 |
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AN0521EN |
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1.3 MB |
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