Internal functional block diagram and external circuit of Hisense KFR-25GW-06BP inverter air conditioner indoor unit microprocessor

Shown is the internal functional block diagram and the connection relationship between the external circuit of the Hisense KFR-25GW/06BP ​​inverter air conditioner indoor unit microprocessor (CPU)
.
    1. Basic working conditions of a microprocessor.
    The core circuit of a microprocessor is the arithmetic unit and the controller. The power supply is to provide operating voltage for the semiconductor devices inside the microprocessor.
The reset circuit provides a reset signal to the microprocessor when it is powered on. The microprocessor is reset and runs from scratch.
The resonant element of the clock signal generating circuit is installed inside the microprocessor integrated circuit, and the circuit generates the clock signal required by the microprocessor. These aspects are
the basic conditions for the normal operation of the microprocessor. 2. The command input circuit
    is connected to the remote control receiving circuit outside the microprocessor @ pin to receive the control signal sent by the user through the remote control transmitter. This signal serves as
the basis for the microprocessor's operation. In addition, the @ foot is connected to an external emergency switch and can also directly receive the switch signal forcibly activated by the user. After receiving these signals, the microprocessor
outputs various control instructions according to the internal program.
    3. The control signal output interface
    @~@ pins are the display driver interface of the microprocessor. The driver displays the light-emitting diode to display the working status.
    The @～@ pin is the stepper motor drive interface, which outputs the air deflector motor (stepper motor) drive pulse. Control
the rotation direction and mode of the air deflector motor .
    Pin ⑧ is the driving interface of the indoor fan motor. The signal output from this interface controls the rotation of the cross-flow fan motor through the relay.
    ⑦Pin is the driving end of the buzzer. The signal is amplified by the amplifier to drive the buzzer to sound.
    Pin ⑩ is the main relay drive interface. When starting up, the output drive signal is controlled by the relay to control the AC 220 V input power supply.
    4． The ①@@ pin of the microprocessor interface circuit of the transmitter
    is the sensor interface. The signal from the external sensor is sent to the microprocessor through this pin, which provides
a reference for the microprocessor when working. Pin @ is for zero-crossing detection, which mainly obtains pulse signals synchronized with the AC 220 V power supply through the zero-crossing detection circuit. ② The pin is the room temperature
detection end, and is connected to an external room temperature sensor. If the indoor temperature reaches the cooling requirements, the microprocessor needs to control the relevant parts to stop cooling.
Pin @ is the coil temperature detection input terminal, allowing the microprocessor to know whether the temperature of the coil is normal during operation.
    5. The communication interface circuit
    @ and @ pins are the interfaces for communication between the indoor microprocessor and the outdoor microprocessor. The microprocessor of the indoor unit can send control
signals to the outdoor unit. The outdoor unit microprocessor can also send back control signals to the indoor unit, that is, the working status of the outdoor unit, so that the indoor unit can
determine whether there is an abnormality in the system based on this information.
    6. Memory interface
    The @ and @ pins of the microprocessor are memory interfaces, through which the data of the external memory (E2PROM) is stored.
The adjusted working status, working mode, temperature settings and other data after the air conditioner is turned on are stored in this memory.
The data stored in this memory will not be lost after the power is turned off. The parameters set after shutting down and restarting are still retained and do not need to be readjusted, which brings convenience to users. If the
user changes some settings during use, the microprocessor will automatically update the new set data.