Rs 232 driver chip, alsoIt is the process of level conversion, TTL level and CMOS level to each other. Our commonly used MCU 232 interface is TTL level, and our computer 232 interface, are CMOS, how to make TTL level and CMOS level match, the middle can only add conversion chip to complete.
In serial communication, both sides of the communication are required to use a standard interface, the role of RS232 is to make different devices can be easily connected to communicate.
MAX232 chip is designed for RS-232 standard serial port by MAXIM CompanyThe meter's single power level conversion chip uses a 5v single power supply. The MAX220-MAX249 series line drivers/receivers are designed for EIA/TIA-232E and V.28/V.24 communication interfaces, especially in applications where ±12V power is not available. These devices are particularly suitable for battery-powered systems due to their low-power shutdown mode, which reduces power consumption to less than 5uW.
Balanced transmission RS-42RS-485 is different from RS-232 in that the data signal adopts differential transmission, also known as balanced transmission, which uses a pair of twisted pairs32 Device. There are 4 mouths and 8 mouths common on the market, and the price is about 100-200.
With the serial port expansion chip, WK2204 or WK2168, through the SPI/I2C/UART/ 8-bit bus to expand 4 serial ports, the chip supports RS485 automatic transceiver, through the extended UART connected to RS232 and RS485 level conversion chip can be. WK2204 and WK2168 both have RS485 automatic transceiver function, which is very convenient.
Both serial ports can receive the same information. Add an identification number to the messageCode.
Must have ah, WK2114, one three-wire serial port expansion 4 hardware serial ports, 256-level FIFO, 2Mbps rate, baud rate adaptive.
Other programs communicate with the first program to achieve transceiver, all transceiver the first program to do. Or write a dll program file, dedicated to the operation of the serial port, other programs indirectly use the serial port by calling the dll interface function. 2: After each program is used, close the serial port, so that other programs can be connected successfully. The way you say, if you want to achieve, you have to write the driver layer program, which is very troublesome, and noIt is necessary...
The function of the serial port is definitely communication. You're asking about the MAX232 chip, aren't you? It's used for level switching.
RS232 is an interface, is usually referred to as a serial port, RS232 interface communication to 12V voltage can be identified, but also high is the relative high and low level of 12V and 0V, but 51 MCU high and low level of 5V and 0V, the level is not the same can not communicate, the middleA level conversion chip is required to act as a translator, and the MAX232 acts as this. USB serial port refers to a device that can convert USB signals into serial signals.
MAX232 chip is a single power level conversion chip designed for RS-232 standard serial port by MAXIM company, using 5v single power supply. The MAX220-MAX249 series line drivers/receivers are designed for EIA/TIA-232E and V.28/V.24 communication interfaces, especially in applications where ±12V power is not available. These devices are particularly well suitedBattery powered system, this is due to its low power off mode can reduce power consumption to less than 5uW.
MAX232 and MAX202E chips are the interface circuits specially designed for the RS-232 standard serial port of the computer chip , using a 5v single power supply. The MAX232 and MAX202 pins are fully compatible, have basically the same functions, and can be replaced with each other. If you want to distinguish on the circuit board, but the working temperature is not the same. Internal junctionThe structure can be divided into three parts: the first part is the charge pump circuit. It consists of 6 pins and 4 capacitors.
max232 is a chip that converts the serial port rs232 signal level (-10, 10v) of the computer into the TTL signal flat (0, 5) used by the MCU. The price of this chip is about 6 yuan more expensive. Next, I will introduce the max232 pin diagram and the connection circuit between max232 and the computer serial port, and the RS232 pin definition.
Connect power: The MAX232 chip needs to connect 5V and GND power pinsAs well as dual power supply VCC and VEE pins, where the VCC pin is connected to the 5V power supply and the VEE pin is connected to the negative power supply. Connect to Microcontroller: The TX sending pin of the microcontroller is connected to the T2IN input of the MAX232, and the T2OUT output of the MAX232 is connected to the RX receiving pin of the microcontroller.
Realize the communication between the MCU and the computer or its equipment. 51 MCU serial port 232 chip function is to realize the MCU and the computer or its equipment betweenCommunication, because the MAX232 chip can convert the standard RS232 serial port level into the UART0V/5V level that the single chip can recognize and withstand, and realize the communication between the single chip and the computer or its equipment.
The function of the max232 chip is to convert TTL level signals to RS232 level signals in order to achieve serial communication. Its expansion: max232 chip can realize two-way communication between TTL and RS232, currently widely used in the interface connection between computers and microcontrollers, and can achieve a variety of level conversion, such as ECL, TTL,CMOS level is converted to RS232 level.
MAX232 chip is a single power level conversion chip designed for RS-232 standard serial port by MAXIM company, using 5v single power supply. The MAX220-MAX249 series line drivers/receivers are designed for EIA/TIA-232E and V.28/V.24 communication interfaces, especially in applications where ±12V power is not available. These devices are particularly suitable for battery-powered systems due to their low-power shutdown mode, which reduces power consumption to less than 5uW.