In remote control market, RF remote control is one of the extensive products of current applications, because it has the advantages of low power consumption, high reliability and low cost, often become the first choice for industrial and commercial applications. Today, I'm taking everyone to understand a RF remote control hardware program - based on the sharp-controlled micro-electronic RC112 wireless transmit single chip, in my opinion, the biggest highlight of this product is that the circuit design is very simple and cost is cheap. Let's come together.
The appearance function shown in the car remote control product taken is 4 function buttons and an LED indicator.
The appearance, the function is not discussed, this can only be considered a sample, there is not much sense, actually unpacking to see the internal hardware program.
It is found that the internal circuit design is very simple, the onboard electronic components can come over, the button battery, the main chip and its circuits, antenna, buttons, LED indicators, can be said to be at a glance.
The specific hardware schematic design of the wireless remote control is shown in the following figure.
The main chip of this hardware program uses the RC112 wireless transmitter chip independently developed by Suzhou sharp control microelectronics. This is a single-chip scheme integrating 433M sound surface wave oscillator, RF and 2260, 1527 encoding IC. As can be seen from the above schematic, its circuit design is very simple. Due to the self-contained encryption protocol, externally does not need additional MCU cooperation, even we can see that the external crystals are not needed in the circuit design. The functions of each pin of the chip circuit are as follows:
The RC112 chip uses a common SOP package with common 16PIN, suitable for manual welding debug, see below.
The RC112 built-in button detection automatic shutdown function, which can be minimized when the engineer is designed and minimized, and the RC 112 also integrates output overcurrent protection, in-chip over temperature protection and power supply undervoltage protection Waiting for functions to prevent burst from damage to the chip.
The system block diagram inside the RC112 is as follows.
The characteristics of the wireless transmit chip RC112:
Transmit power: 10dBM
Modulation mode: OOK / ASK
Shutdown current: 0.2ua
Transmit current: 10mA
Power supply voltage range: 1.8 ~ 3.6V
Frequency accuracy: ± 250kHz
From the characteristics of the wireless transmit chip RC112, the standby current of the chip is very low, or it works in a low voltage environment of 1.8V, which is ideal for battery power supply. Finally, let's take a look at the simulation performance of the chip, and the official gives the wireless performance parameters under the two frequencies (433m / 315m), as shown in the figure below, and the actual communication distance size can be adjusted according to the requirements.
Through a small remote remote control dismantling, it is recommended to recommend a simple, very cost-effective wireless RF hardware solution. The sharp-controlled RC112 circuit is simple, fully integrated, and the externally does not require additional crystals, and the standby current is low. Voltage work, suitable for battery power, communication distance size can also be adjusted according to customer needs, ideal for security access control systems, security fire protection systems, vehicle monitoring systems, wireless alarms, wireless remote control, wireless sensing, etc. Interested engineers may wish to pay more attention A bit.
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